ORCID Profile
0000-0002-2723-6553
Current Organisation
The University of Newcastle
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanomaterials | Macromolecular and Materials Chemistry | Nanochemistry and Supramolecular Chemistry | Nanotechnology | Physical Chemistry of Materials | Physical Chemistry (Incl. Structural) | Nanoscale Characterisation | Mechanical engineering | Catalysis and Mechanisms of Reactions | Synthesis of Materials | Colloid and Surface Chemistry | Powder and Particle Technology | Chemical Characterisation of Materials | Electrochemistry | Structural Chemistry and Spectroscopy | Nanophotonics | Microelectromechanical systems (MEMS) | Functional Materials | Macromolecular and Materials Chemistry not elsewhere classified | Environmental Monitoring | Environmental Nanotechnology | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Chemical Sciences | Human Diagnostics | Expanding Knowledge in Technology | Hydrogen Production from Renewable Energy | Solar-Photovoltaic Energy | Expanding Knowledge in the Environmental Sciences | Diagnostic Methods | Expanding Knowledge in the Earth Sciences | Expanding Knowledge in Engineering | Human Pharmaceutical Products not elsewhere classified | Expanding Knowledge in the Biological Sciences |
Related Links
Publications
Silicon Nanowire Photocathodes for Photoelectrochemical Hydrogen Production
Publisher: MDPI AG
Date: 05-08-2016
DOI: 10.3390/NANO6080144
Silica encapsulation of hydrophobically ligated PbSe nanocrystals
Publisher: American Chemical Society (ACS)
Date: 31-03-2006
DOI: 10.1021/LA0529658
Abstract: Spherical PbSe@SiO2 nanoparticles have been successfully synthesized within reverse micelles via metal alkoxide hydrolysis and condensation within a microemulsion system. These core-shell nanoparticles were characterized by transmission electron microscopy (TEM), NIR absorption spectroscopy, energy-dispersive X-ray analysis, and TEM electron diffractions. It shows that the obtained core-shell structures have a spherical shape with narrow size distribution (average size approximately 35 nm) and smooth surfaces. The size of the particles and the thickness of the shells can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilane (TEOS) within the microemulsion.
Solid-Electrolyte Interphases (SEI) in Nonaqueous Aluminum-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 23-03-2020
A C/V2O5 core-sheath nanofibrous cathode with mixed-ion intercalation for aluminium-ion batteries
Publisher: IOP Publishing
Date: 07-04-2020
Abstract: A new nanofibrous material, consisting of a conductive carbon core and an external layer made of vanadium oxide, has been studied as a cathode for aluminium-ion batteries. The material enables a mixed-ion intercalation mechanism, resulting in the alternating insertion of Al 3+ and AlCl 4 − in the V 2 O 5 and carbon layers, respectively. This is a highly desirable feature for cathode materials which may increase the energy density of future batteries by optimising the utilisation of the electrolyte.
Integrated Sample Preparation, Reaction, and Detection on a High-Frequency Centrifugal Microfluidic Platform
Publisher: SAGE Publications
Date: 10-2005
DOI: 10.1016/J.JALA.2005.07.002
Abstract: We extend the toolbox of lab procedures in life sciences by development of centrifugal microfluidics for high-level process integration. This is accomplished by implementing novel functional principles for sedimentation, batch-mode mixing, frequency-dependent online flow control, and optical read-out, which can be integrated into a process chain. The modular centrifugal setup comprises a microstructured disposable polymer disk as well as a reusable spinning and detection unit. We successfully developed centrifugal microfluidic technologies, which are suitable for s le preparation, process engineering, personalized diagnostics, and hematology, on this platform.
Triangular lattice Potts models
Publisher: Springer Science and Business Media LLC
Date: 06-1982
DOI: 10.1007/BF01012610
Synthesis and Spectroscopic Investigations of Cu- and Pb-Doped Colloidal ZnS Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 26-10-2006
DOI: 10.1021/JP064570I
Abstract: A novel organometallic synthesis method for the preparation of colloidal ZnS nanoparticles is presented. This method enables the synthesis of undoped ZnS nanocrystals as well as doping with Cu, Pb, or both. The particles can be covered with an undoped layer of ZnS, forming core/shell-type particles with the ZnS:Pb, ZnS:Cu, or ZnS:Cu,Pb cores. The particles were characterized via TEM, XRD, dynamic light scattering, and optical spectroscopy. We investigated the extrinsic surface defects and their coverage with an additional ZnS layer in detail by temperature-dependent luminescence and luminescence lifetime spectroscopy.
Boron-Doped Silicon Diatom Frustules as a Photocathode for Water Splitting
Publisher: American Chemical Society (ACS)
Date: 30-07-2015
Abstract: An effective solar-powered silicon device for hydrogen production from water splitting is a priority in light of diminishing fossil fuel vectors. There is increasing demand for nanostructuring in silicon to improve its antireflective properties for efficient solar energy conversion. Diatom frustules are naturally occurring biosilica nanostructures formed by biomineralizing microalgae. Here, we demonstrate magnesiothermic conversion of boron-doped silica diatom frustules from Aulacoseira sp. into nanostructured silicon with retention of the original shape. Hydrogen production was achieved for boron-doped silicon diatom frustules coated with indium phosphide nanocrystal layers and an iron sulfur carbonyl electrocatalyst.
Investigation of porous silicon photocathodes for photoelectrochemical hydrogen production
Publisher: Elsevier BV
Date: 11-2016
Combined TIRF-AFM setup: controlled quenching of individual quantum dots
Publisher: SPIE
Date: 09-02-2006
DOI: 10.1117/12.645067
Monodisperse upconversion GdF3:Yb, Er rhombi by microwave-assisted synthesis
Publisher: Springer Science and Business Media LLC
Date: 29-03-2011
Abstract: We have synthesized a variety of monodisperse colloidal GdF 3 :Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis. Typical upconversion emission from Er 3+ was observed. In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.
Catalytically Active Bimetallic Nanoparticles Supported on Porous Carbon Capsules Derived from Metal-Organic Framework Composites
Publisher: American Chemical Society (ACS)
Date: 30-08-2016
DOI: 10.1021/JACS.6B06736
Abstract: We report a new methodology for producing monometallic or bimetallic nanoparticles confined within hollow nitrogen-doped porous carbon capsules. The capsules are derived from metal-organic framework (MOF) crystals that are coated with a shell of a secondary material comprising either a metal-tannic acid coordination polymer or a resorcinol-formaldehyde polymer. Platinum nanoparticles are optionally sandwiched between the MOF core and the shell. Pyrolysis of the MOF-shell composites produces hollow capsules of porous nitrogen-doped carbon that bear either monometallic (Pt, Co, and Ni) or alloyed (PtCo and PtNi) metal nanoparticles. The Co and Ni components of the bimetallic nanoparticles are derived from the shell surrounding the MOF crystals. The hollow capsules prevent sintering and detachment of the nanoparticles, and their porous walls allow for efficient mass transport. Alloyed PtCo nanoparticles embedded in the capsule walls are highly active, selective, and recyclable catalysts for the hydrogenation of nitroarenes to anilines.
A 2.7 V Aqueous Supercapacitor Using a Microemulsion Electrolyte**
Publisher: Wiley
Date: 03-03-2021
Abstract: The use of aqueous electrolytes in energy storage devices is traditionally limited by the voltage stability window of water at 1.23 V. Here, we present the use of a microemulsion based electrolyte which, although mostly water by mass, has a voltage stability window of up to 5 V. This allows the cost and safety benefits of aqueous electrolytes to finally be realised in high voltage systems. Supercapacitors constructed using this electrolyte were able to achieve and maintain a capacitance of ∼40 Fg −1 and an energy density of ∼40 Wh kg −1 with a Coulombic efficiency of 99 % for over 10,000 cycles on activated carbon.
Glucose Sensor Using Redox Active Oligonucleotide-Templated Silver Nanoclusters
Publisher: MDPI AG
Date: 24-07-2019
DOI: 10.3390/NANO9081065
Abstract: Redox active, photoluminescent silver nanoclusters templated with oligonucleotides were developed for glucose sensing. The silver nanoclusters had a photoluminescent emission at 610 nm that reversibly changed to 530 nm upon oxidation. The reversible emission change was measured with photoluminescent spectroscopy and used to detect H2O2, which is a by-product of the reaction of glucose with glucose oxidase. The ratio of the un-oxidised emission peak (610 nm) and the oxidised analogue (530 nm) was used to measure glucose concentrations up to 20 mM, well within glucose levels found in blood. Also, the reversibility of this system enables the silver nanoclusters to be reused.
Isotachophoretic measurements of luminescent semiconductor nanocrystals
Publisher: Inderscience Publishers
Date: 2007
Origin of permanent electric dipole moments in wurtzite nanocrystals
Publisher: Elsevier BV
Date: 2004
Deep level defect luminescence in cadmium selenide nano-crystals films
Publisher: Elsevier BV
Date: 07-2005
Unraveling the multivalent aluminium-ion redox mechanism in 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CP05716B
Abstract: The intercalation mechanism of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) in non-aqueous Al-ion batteries was investigated. Through a combination of computational and experimental data, the intercalating species was found to be AlCl 2+ .
Photoresponsive properties of ultrathin silicon nanowires
Publisher: AIP Publishing
Date: 08-12-2014
DOI: 10.1063/1.4904089
Abstract: Functional silicon nanowires (SiNWs) are promising building blocks in the design of highly sensitive photodetectors and bio-chemical sensors. We systematically investigate the photoresponse properties of ultrathin SiNWs (20 nm) fabricated using a size-reduction method based on e-beam lithography and tetramethylammonium hydroxide wet-etching. The high-quality SiNWs were able to detect light from the UV to the visible range with excellent sensitivity (∼1 pW/array), good time response, and high photoresponsivity (R ∼ 2.5 × 104 A/W). Improvement of the ultrathin SiNWs' photoresponse has been observed in comparison to 40 nm counter-part nanowires. These properties are attributable to the predominance surface-effect due to the high surface-to-volume ratio of ultrathin SiNWs. Long-term measurements at different temperatures in both the forward and reverse bias directions demonstrated the stability and reliability of the fabricated device. By sensitizing the fabricated SiNW arrays with cadmium telluride quantum dots (QDs), hybrid QD SiNW devices displayed an improvement in photocurrent response under UV light, while preserving their performance in the visible light range. The fast, stable, and high photoresponse of these hybrid nanostructures is promising towards the development of optoelectronic and photovoltaic devices.
Synthesis and phase transfer of monodisperse iron oxide (Fe 3O4) nanocubes
Publisher: CSIRO Publishing
Date: 2014
DOI: 10.1071/CH13595
Abstract: Cube-shaped magnetic iron oxide nanoparticles were synthesised and studied with the aim to achieve superior magnetic properties. This study describes a straightforward and simple synthesis method for preparing monodisperse 11–14-nm superparamagnetic iron oxide nanocubes via an ‘effective monomer’ growth mechanism. The as-synthesised nanoparticles are insoluble in water. However, substitution of the non-polar ligands of the particles using a new method that involved an ionic compound generated colloidally stable and water dispersible cube-shaped particles with a very small hydrodynamic diameter. The cubes displayed superior magnetic properties over spherical particles.
Silicon diatom frustules as nanostructured photoelectrodes
Publisher: Royal Society of Chemistry (RSC)
Date: 22-07-2014
DOI: 10.1039/C4CC04470C
Abstract: In the quest for solutions to meeting future energy demands, solar fuels play an important role. A particularly promising ex le is photocatalysis since even incremental improvements in performance in this process are bound to translate into significant cost benefits. Here, we report that semiconducting and high surface area 3D silicon replicas prepared from abundantly available diatom fossils sustain photocurrents and enable solar energy conversion.
Isotachophoretic measurements of luminescent semiconductor nanocrystals
Publisher: World Scientific Pub Co Pte Lt
Date: 2007
DOI: 10.1142/S1793048007000453
Abstract: Luminescent semiconductor nanocrystals of CdTe and CdSe were derivatised by mercaptocarboxylic acids. A direct synthesis in the solution of the ligand and a post-synthesis ligand exchange method was used. The two methods were compared and evaluated by isotachophoresis. The electrophoretic mobility as well as the colloidal stability and the coverage with the ligand, were determined. An alternative method for the concentration estimation of nanocrystals by means of isotachophoresis was introduced.
Microfluidic Chip for the Photocatalytic Production of Active Chlorine
Publisher: American Chemical Society (ACS)
Date: 16-07-2021
DOI: 10.1021/ACS.LANGMUIR.6B00748
Abstract: Active chlorine is the most powerful microbicidal reagent in swimming pools, potable water, hospitals, and medical surgeries. Its production mainly relies on reactive inorganic intermediates and electrochemical methods that involve undesired waste products and high energy as well as material costs. In this study, we fabricated a low-cost chip based on sputter-coated thin films of silver (Ag) that acted as recyclable and effective photoelectrode for the photocatalytic production of active chlorine (HOCl) from aqueous media and artificial sunlight. The photoelectrode was electrochemically activated to AgCl at low overpotentials between 0.2 and 0.4 V vs Ag|AgCl (3 M KCl) and photocatalytically reduced to Ag(0) for 15 consecutive cycles, showing the electrode still being active. However, because of poor adhesion properties on the selected substrates, degradation effects were observed over time. Furthermore, the Ag@AgCl photoelectrode was integrated into a microfluidic chip, and we showed for the first time a light-driven microfluidic chip generating a constant stream of active chlorine.
Nanostructured silicon photoelectrodes for solar water electrolysis
Publisher: Elsevier BV
Date: 10-2015
Single quantum dots in spherical silica particles
Publisher: Wiley
Date: 05-10-2004
Fluorescence‐Emission Control of Single CdSe Nanocrystals Using Gold‐Modified AFM Tips
Publisher: Wiley
Date: 19-12-2006
Selective assembly of Au-Fe3 O4 nanoparticle hetero-dimers
Publisher: Springer Science and Business Media LLC
Date: 28-07-2015
Three-dimensional micro-printing of temperature sensors based on up-conversion luminescence
Publisher: AIP Publishing
Date: 30-03-2015
DOI: 10.1063/1.4916222
Abstract: The pronounced temperature dependence of up-conversion luminescence from nanoparticles doped with rare-earth elements enables local temperature measurements. By mixing these nanoparticles into a commercially available photoresist containing the low-fluorescence photo-initiator Irgacure 369, and by using three-dimensional direct laser writing, we show that micrometer sized local temperature sensors can be positioned lithographically as desired. Positioning is possible in pre-structured environments, e.g., within buried microfluidic channels or on optical or electronic chips. We use the latter as an ex le and demonstrate the measurement for both free space and waveguide-coupled excitation and detection. For the free space setting, we achieve a temperature standard deviation of 0.5 K at a time resolution of 1 s.
Graphite-Mediated Microwave-Exfoliated Graphene Fluoride as Supercapacitor Electrodes
Publisher: MDPI AG
Date: 24-05-2022
DOI: 10.3390/NANO12111796
Abstract: A graphite-mediated microwave-based strategy was used for solid-state exfoliation of graphite fluoride in a few seconds, followed by a simple yet efficient separation to obtain exfoliated materials based on the density difference between graphite and graphene fluoride in solvent. The microwave-exfoliated graphene fluoride was a few layers thick and electrically conductive. The electrochemical testing of pouch-cell supercapacitors assembled by using the exfoliated graphene fluoride electrodes and a novel microemulsion-based electrolyte showed reasonable performance with typical electrical double-layer capacitance behavior and good rate capability (gravimetric specific capacitance: 3.2 F g−1 at 500 mA g−1 and 3.1 F g−1 at 5000 mA g−1). The BET specific surface areas of the as-exfoliated graphene fluoride are ~60–80 m2 g−1, which could be increased by activation using this simple yet versatile microwave-based method for further improvements on the electrochemical performance.
Charge transfer mechanism in hybrid bulk heterojunction composites
Publisher: AIP Publishing
Date: 13-01-2004
DOI: 10.1063/1.1632891
Abstract: Charge transfer mechanisms of several conducting polymers and polymer/CdSe nanocrystal composites (hybrid bulk heterojunction composites) were investigated by means of cyclic voltammetry. Potential application of these composites in hybrid light-emitting diodes was discussed. It was found that charge transfer is observed in most of the composites, used so far, but was relatively slow or incomplete. The PVPy/CdSe nanocrystal composite showed promising results, and is favorable for use in electroluminescent devices.
Synthesis and spectroscopic characterization of fluorescent blue-emitting ultrastable CdSe clusters
Publisher: Wiley
Date: 07-2008
Hollow silica nanospheres: In situ, semi-in situ, and two-step synthesis
Publisher: American Chemical Society (ACS)
Date: 07-03-2007
DOI: 10.1021/CM062803C
Erratum: Monodisperse upconverting nanocrystals by microwave-assisted synthesis (ACS Nano (2009) 3 (3804-3808))
Publisher: American Chemical Society (ACS)
Date: 26-02-2010
DOI: 10.1021/NN100270N
Monodisperse upconverting nanocrystals by Microwave-assisted synthesis
Publisher: American Chemical Society (ACS)
Date: 29-10-2009
DOI: 10.1021/NN9012093
Abstract: Upconverting nanocrystals have a tremendous potential for applications in fields such as bioanalysis, medical therapy, or display technologies. However, a prerequisite for many applications is the availability of small, monodisperse, and highly luminescent nanocrystals. Here we show, that a microwave-assisted synthesis approach allows for the synthesis of such monodisperse and luminescent upconverting nanocrystals within 5 min in a closed reaction vessel. Even though the same reactants and solvents as with classical conductive heating reactions were used, microwave-assisted synthesis resulted in differently sized and shaped particles and provided superior reaction control. The nucleation and growth mechanism follows a La Mer scheme and can be controlled extremely accurately. It is expected that the fundamental principles of this synthesis approach can be applied to many other types of nanocrystals as well.
In-situ local temperature measurement during three-dimensional direct laser writing
Publisher: AIP Publishing
Date: 16-09-2013
DOI: 10.1063/1.4821556
Abstract: We present an approach to measure in situ the local temperature increase in the exposed volume during three-dimensional direct laser writing. The method is based on the detection of luminescence from NaYF4:Yb3+, Er3+ co-doped nanocrystals in a confocal scheme. We found the temperature increase to be below a few K within the normal writing regime. If the photoresist is overexposed, significant temperature changes of several hundred K can be observed.
Au-silica nanoparticles by reverse synthesis of cores in hollow silica shells
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B703811A
Abstract: Core-silica shell nanoparticles were prepared in a "reverse" manner by nucleation and growth of Au cores within hollow silica nanospheres.
An In Vitro Investigation of Cytotoxic Effects of InP/Zns Quantum Dots with Different Surface Chemistries
Publisher: MDPI AG
Date: 22-01-2019
DOI: 10.3390/NANO9020135
Abstract: Indium phosphide quantum dots (QDs) passivated with zinc sulphide in a core/shell architecture (InP/ZnS) with different surface chemistries were introduced to RAW 264.7 murine “macrophage-like” cells to understand their potential toxicities. The InP/ZnS quantum dots were conjugated with an oligonucleotide, a carboxylic acid, or an amino-polyethylene glycol ligand, and cell viability and cell proliferation were investigated via a metabolic assay. Membrane integrity was measured through the production of lactate dehydrogenase. Fluorescence microscopy showed cellular uptake. All quantum dots exhibited cytotoxic behaviour less than that observed from cadmium- or lead-based quantum dots however, this behaviour was sensitive to the ligands used. In particular, the amino-polyethylene glycol conjugated quantum dots proved to possess the highest cytotoxicity examined here. This provides quantitative evidence that aqueous InP/ZnS quantum dots can offer a safer alternative for bioimaging or in therapeutic applications.
Heterogeneous charge transfer of colloidal nanocrystals in ionic liquids
Publisher: Wiley
Date: 11-01-2006
Intestinal absorption of fluorescently labeled nanoparticles
Publisher: Elsevier BV
Date: 07-2015
Acoustically Levitated Droplets
Publisher: Wiley
Date: 05-2008
Abstract: Acoustic levitation is used as a new tool to study concentration-dependent processes in fluorescence spectroscopy. With this technique, small amounts of liquid and solid s les can be measured without the need for s le supports or containers, which often limits signal acquisition and can even alter s le properties due to interactions with the support material. We demonstrate that, because of the small s le volume, fluorescence measurements at high concentrations of an organic dye are possible without the limitation of inner-filter effects, which h er such experiments in conventional, cuvette-based measurements. Furthermore, we show that acoustic levitation of liquid s les provides an experimentally simple way to study distance-dependent fluorescence modulations in semiconductor nanocrystals. The evaporation of the solvent during levitation leads to a continuous increase of solute concentration and can easily be monitored by laser-induced fluorescence.
Insights into the mechanism of quantum dot-sensitized singlet oxygen production for photodynamic therapy
Publisher: American Chemical Society (ACS)
Date: 18-04-2012
DOI: 10.1021/JP301103F
Application of luminescent nanocrystals as labels for biological molecules
Publisher: Springer Science and Business Media LLC
Date: 20-07-2004
DOI: 10.1007/S00216-004-2706-Y
Abstract: Luminescent semiconductor nanocrystals, so called "quantum dots" (QD), have attracted increasing interest for bioanalytical labeling applications in recent years. This review describes the major optical and (bio)chemical features of this class of label, compared with organic dyes. Different conjugation methods are also discussed and the most important recent applications are presented. An overview over the current state-of-the-art is given, as also is an outlook on possibilities and limitations.
Fluorescence lifetime analysis of graphene quantum dots
Publisher: American Chemical Society (ACS)
Date: 12-12-2014
DOI: 10.1021/JP510436R
CuInS2 /ZnS nanocrystals as sensitisers for NiO photocathodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA01821H
Abstract: Nickel oxide (NiO) is the most universally studied photocathode to date. We demonstrate that non-toxic CuInS 2 /ZnS NCs can be used to sensitise NiO photocathodes to achieve an (almost) all-inorganic system.
Electrospun Composites of Polycaprolactone and Porous Silicon Nanoparticles for the Tunable Delivery of Small Therapeutic Molecules
Publisher: MDPI AG
Date: 29-03-2018
DOI: 10.3390/NANO8040205
Platinum Terpyridine Metallopolymer Electrode as Cost-Effective Replacement for Bulk Platinum Catalysts in Oxygen Reduction Reaction and Hydrogen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 04-10-2017
Colloidal Quantum Dots in High-Q Pillar Microcavities
Publisher: IEEE
Date: 06-2007
Organometallic synthesis and electrophoretic characterization of high-quality ZnS:Mn/ZnS core/shell nanoparticles for bioanalytical applications
Publisher: Springer Science and Business Media LLC
Date: 09-07-2008
Silica-coated InP/ZnS nanocrystals as converter material in white LEDs
Publisher: Wiley
Date: 03-11-2008
Colloidal quantum dots in high-Q pillar microcavities
Publisher: IEEE
Date: 05-2007
Molybdenum Dichalcogenide Cathodes for Aluminum‐Ion Batteries
Publisher: Wiley
Date: 06-0009
Synthesis and Exploitation of InP/ZnS Quantum Dots for Bioimaging
Publisher: SPIE
Date: 12-02-2009
DOI: 10.1117/12.816892
Deposition of hydroquinone-thiosulfate on gold by means of anodic oxidation
Publisher: Elsevier BV
Date: 06-2001
InP nanowires from surfactant-free thermolysis of single molecule precursors
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2DT30283G
Abstract: Indium phosphide nanofibres were grown from a single-molecule precursor, [(PhCH(2))(2)InP(SiMe(3))(2)](2), using hot injection techniques by a solution-liquid-solid (SLS) process, under "surfactant-free" conditions and without the use of protic additives. The fibres are 85-95 nm in diameter and grow from In metal droplets of 100 nm diameter. The length of the nanofibres is a function of the precursor injection temperature (rather than the growth temperature) and can be varied from 6000 nm at 210 °C to 1000 nm at 310 °C. The indium metal tip can be readily removed under mild, non-etching conditions by treatment with thiophenol-P(SiMe(3))(3) mixtures.
Heterogeneity in the fluorescence of graphene and graphene oxide quantum dots
Publisher: Springer Science and Business Media LLC
Date: 12-01-2017
Calibration-free concentration determination of charged colloidal nanoparticles and determination of effective charges by capillary isotachophoresis
Publisher: Springer Science and Business Media LLC
Date: 05-07-2009
DOI: 10.1007/S00216-009-2887-5
Abstract: Although colloidal nanoparticles show an electrophoretic heterogeneity under the conditions of capillary electrophoresis, which can be either due to the particle-size distribution and/or the particle shape distribution and/or the zeta-potential distribution, they can form correct isotachophoretic zones with sharp-moving boundaries. Therefore, the technique of isotachophoresis permits to generate plugs in which the co-ions and counter ions of the original colloidal solution are removed and replaced by the buffering counter ions of the leading electrolyte. It is shown that analytical isotachophoresis can be used to measure directly, without calibration, the molar (particle) concentration of dispersed ionic colloids provided that the transference number and the mean effective charge number of the particles (within the isotachophoretic zone) can be determined with adequate accuracy. The method can also be used to measure directly the effective charge number of biomacromolecules or colloidal particles, if solutions with known molar (particle) concentration can be prepared. The validity of the approach was confirmed for a model solution containing a known molar concentration of bovine serum albumin.
(Primarily semiconducting) nanocrystals: From fundamental research to electro-optical devices and biosensors
Publisher: Springer Science and Business Media LLC
Date: 03-2008
General Synthetic Strategy for Libraries of Supported Multicomponent Metal Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 18-04-2018
Abstract: Nanoparticles comprising three or more different metals are challenging to prepare. General methods that tackle this challenge are highly sought after as multicomponent metal nanoparticles display favorable properties in applications such as catalysis, biomedicine, and imaging. Herein, we report a practical and versatile approach for the synthesis of nanoparticles composed of up to four different metals. This method relies on the thermal decomposition of nanostructured composite materials assembled from platinum nanoparticles, a metal-organic framework (ZIF-8), and a tannic acid coordination polymer. The controlled integration of multiple metal cations (Ni, Co, Cu, Mn, Fe, and/or Tb) into the tannic acid shell of the precursor material dictates the composition of the final multicomponent metal nanoparticles. Upon thermolysis, the platinum nanoparticles seed the growth of the multicomponent metal nanoparticles via coalescence with the metallic constituents of the tannic acid coordination polymer. The nanoparticles are supported in the walls of hollow nitrogen-doped porous carbon capsules created by the decomposition of the organic components of the precursor. The capsules prevent sintering and detachment of the nanoparticles, and their porosity allows for efficient mass transport. To demonstrate the utility of producing a broad library of supported multicomponent metal nanoparticles, we tested their electrocatalytic performance toward the hydrogen evolution reaction and oxygen evolution reaction. We discovered functional relationships between the composition of the nanoparticles and their electrochemical activity and identified the PtNiCu and PtNiCuFe nanoparticles as particularly efficient catalysts. This highlights how to generate erse libraries of multicomponent metal nanoparticles that can be synthesized and subsequently screened to identify high-performance materials for target applications.
Charge transfer efficiency in hybrid bulk heterojunction composites
Publisher: AIP Publishing
Date: 24-06-2004
DOI: 10.1063/1.1760738
Abstract: On the basis of recently published electrochemical measurements, the charge transfer efficiency within CdSe nanocrystal/conducting polymer heterojunction composites was investigated by means of luminescence interaction strength. It was found that poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] and poly-9-vinylcarbazole luminescence was not totally quenched by nanocrystals, whereas poly-3-octylthiophene and polyvinylpyrrolidone was completely quenched. In case of poly-3-hexylthiophene, the nanocrystal luminescence was quenched. The results are in complete agreement with the electrochemical findings and thus, the CdSe nanocrystal/Polyvinylpyrrolidone composite should be a promising material for electroluminescent devices.
Determination of quantum confinement in CdSe nanocrystals by cyclic voltammetry
Publisher: AIP Publishing
Date: 11-07-2003
DOI: 10.1063/1.1582834
Abstract: Ionization potentials Ip, electron affinities E.A., and the quantum confinement in CdSe nanocrystals were determined by means of cyclic voltammetry. The results were compared to values obtained from spectroscopic measurements, especially UV/vis absorption and photoluminescence emission spectra. Absolute band gap positions were obtained from the electrochemical measurements and discussed with regard to vacuum level values. The results are in good agreement with theoretical expectations and spectroscopic data.
Rapid synthesis of highly luminescent InP and InP/ZnS nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B803263G
Nonmetal Chloride Cathodes for Al-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 29-09-2022
Stability and Fluorescence Quantum Yield of CdSe–ZnS Quantum Dots—Influence of the Thickness of the ZnS Shell
Publisher: Wiley
Date: 05-2008
Abstract: We investigated the correlation between the thickness of the ZnS shell of CdSe-ZnS quantum dots (QDs), the stability of the particles, and the fluorescence quantum yield. As a measure for stability, a new shell quality test was developed. This test is based on the reaction of the QDs with photochemically formed thiophenol radicals and communicates an imperfect ZnS shell by a rapid and complete loss of fluorescence. The quantum yield increases from less than 5% for unshelled CdSe up to 50%, with an increase in ZnS shell thickness up to 0.6-0.8 nm. At the same time, the particles become significantly more stable, as revealed by the shell test.
Direct immunofluorescence of plant microtubules based on semiconductor nanocrystals
Publisher: American Chemical Society (ACS)
Date: 21-09-2007
DOI: 10.1021/BC700188D
Abstract: Fluorescence microscopy in combination with multiple, simultaneous labeling of biomolecules has been a key breakthrough in cell biology. However, the spatiotemporal resolution of this approach is limited by bleaching of the fluorescence label and illegitimate cross-reference of the label. CdSe-based semiconductor nanocrystals with their excellent bleaching stability would be an alternative to overcome this limitation. We therefore explored direct immunofluorescence based on nanocrystal-conjugated antibodies using plant microtubules as model. We compared two strategies of bioconjugation, covalent coupling of antitubulin antibodies to BSA-coated nanocrystals and covalent coupling to nanocrystals that were surrounded by functionalized silica shells. Both nanoparticle-antibody conjugates were used to follow the dynamic reorganization of microtubules through the cell cycle of a tobacco cell culture in double and triple staining with FITC as conventional fluorochrome and Hoechst 33258 as marker for mitotic duplication of DNA. BSA-coated nanocrystals visualized fluorescent dots that decorated the various arrays of microtubules. The specificity of the antibody was maintained after conjugation with the nanocrystals, and the antibodies correctly represented the dynamics of cell-cycle-dependent microtubular reorganization. However, this approach did not yield a contiguous signal. In contrast, silica-shelled nanocrystals visualized contiguous microtubules in the same pattern as found for the conventional fluorochrome FITC and thus can be used as labels for direct immunofluorescence in plant cells.
Silica coated quantum dots: A new tool for electrochemical and optical glucose detection
Publisher: Springer Science and Business Media LLC
Date: 09-07-2008
On battery materials and methods
Publisher: Elsevier BV
Date: 06-2020
Parallelization of chip-based fluorescence immuno-assays with quantum-dot labelled beads
Publisher: IEEE
Date: 2005
Disperse-and-Collect Approach for the Type-Selective Detection of Matrix Metalloproteinases in Porous Silicon Resonant Microcavities
Publisher: American Chemical Society (ACS)
Date: 07-12-2017
Monodisperse CdSe nanorods at low temperatures
Publisher: Wiley
Date: 18-10-2002
DOI: 10.1002/1521-3765(20021018)8:20<4791::AID-CHEM4791>3.0.CO;2-H
Electrochemical determination of mesoscopic phenomena, defect states in CdSe nanocrystals and charge carrier manipulability
Publisher: Springer Science and Business Media LLC
Date: 20-12-2008
Photo-doping of plasma-deposited polyaniline (PAni)
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA12886F
Abstract: Although polyaniline (PAni) has been studied extensively in the past, little work has been done on producing films of this material via plasma deposition.
Cation exchange of aqueous CuInS2 quantum dots
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CE00545G
Abstract: Chalcopyrite copper indium disulfide (CIS) QDs have been of recent interest due to their non-toxicity. This article shows a straightforward aqueous cation exchange method to synthesise CIS particles with zinc sulfide coating.
Visualizing the self-assembly of tubulin with luminescent nanorods
Publisher: American Scientific Publishers
Date: 10-2003
DOI: 10.1166/JNN.2003.219
Abstract: We succeeded in labeling tubulin with luminescent CdSe nanorods. The labeled tubulin was still able to self-assemble into microtubules, demonstrating that the protein has remained functional. The comparison with rhodamine-labeled tubulin revealed that whereas the rhodamine bleached completely within the observed time frame, the nanorods did not show any bleaching, which makes it possible to follow the key events of self-assembly at high time resolution. Preparation and derivatization of nanorods are described. Water-soluble, protein-reactive group-containing particles were covalently coupled to tubulin. The conjugate was purified by one cycle of assembly and disassembly and used to induce the formation of fluorescent microtubules. These results suggest that the use of luminescent nanorods should allow continuous confocal monitoring of dynamic biological processes.
Deposition Methods of Graphene as Electrode Material for Organic Solar Cells
Publisher: Wiley
Date: 07-11-2017
Rapid synthesis of defective and composition-controlled metal chalcogenide nanosheets by supercritical hydrothermal processing
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NA00435A
Abstract: Defective Mo(S,Se) 2 and (Mo,W)S 2 nanosheets are synthesized by a supercritical hydrothermal process without highly toxic sources in a short time.
An electrochemical biomimetic ATP-sensor
Publisher: Elsevier BV
Date: 2005
Phase-transfer of CdSe@ZnS quantum dots using amphiphilic hyperbranched polyethylenimine
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B414807J
Abstract: A new, straightforward method for the phase-transfer of CdSe@ZnS quantum dots from non-polar solvents into water and short-chained alcohols using hiphilic hyperbranched polyethylenimine of different molar weights is suggested and the experimental procedure is discussed as well as the chemical properties of the resulting polymer-derivatised nanocrystals.
Mesoporous and defective activated carbon cathode for AlCl4− anion storage in non-aqueous aluminium-ion batteries
Publisher: Elsevier BV
Date: 05-2022
Unraveling aminophosphine redox mechanisms for glovebox-free InP quantum dot syntheses
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR01286E
Abstract: A DFT investigation of aminophosphine conversion mechanisms revealed the reliance on zinc salts for InP nanoparticle formation.
New dynamic hydrogen reference electrode for applications in thin-film sensor systems
Publisher: Elsevier BV
Date: 11-2000
InP/ZnS nanocrystals as fluorescent probes for the detection of ATP
Publisher: SAGE Publications
Date: 2014
DOI: 10.5772/58523
Abstract: This article reports on a study on fluorescence adenosine triphosphate (ATP) detection by InP/ZnS quantum dots (QDs). We present a spectroscopic analysis displaying the effect of enzymatic reactions of glucose oxidase (GOX) and hexokinase (HEX) on the InP/ZnS quantum dots at physiological pH. The InP/ZnS quantum dots act as glucose sensors in the presence of GOX, Glu and ATP, and their luminescence quenches during the release of hydrogen peroxide from the reaction. However, in the presence of adenosine 5′ triphosphate, glucose, and HEX, a significant photobrightening of the InP/ZnS QDs is recorded. This is dependent on the concentration of ATP in the s le. The relationship between the ATP and the emission intensity of InP/ZnS nanocrystals is linear. The present results are the first to report the effect of different by-products released by these enzymatic reactions on the fluorescence of the InP/ZnS QDs.
A highly efficient ligand exchange reaction on gold nanoparticles: Preserving their size, shape and colloidal stability
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA05035E
Abstract: Almost complete ligand exchange and excellent colloidal stability of gold nanoparticles can be achieved by a new solvent extraction based method.
Quantum dots for electro-optic devices
Publisher: American Chemical Society (ACS)
Date: 05-07-2011
DOI: 10.1021/NN2022974
Abstract: We discuss the use of quantum dots (QDs) in electro-optic devices. The focus of the article is on key problems in this area: the electronic and optical properties of QDs, dispersing QDs in polymers and the requirements for both, and QDs and polymer composites in devices such as solar cells, light-emitting devices, and detectors. The accompanying article by Geyer et al. in this issue of ACS Nano demonstrates an excellent ex le of a detector device, which also points to future directions for research in this field.
Novel devices for isolation and detection of bacterial and mammalian extracellular vesicles
Publisher: Springer Science and Business Media LLC
Date: 26-03-2021
DOI: 10.1007/S00604-021-04790-5
Abstract: Extracellular vesicles are spherical nanoparticles inherently released by almost all cell types. They acquire the cell's membrane and cytoplasmic characteristics offering abundant identical units that can be captured to recognize the cell of origin. The abundance of vital cell information and multifunctional roles in cellular processes has rendered them attention, particularly as promising biomarkers for disease diagnosis and use in potential drug delivery systems. This review provides insights into standard approaches towards cultivation and isolation of mammalian and bacterial extracellular vesicles. We assess gaps in conventional separation and detection technologies while also tracking developments in ongoing research. The review focuses on highlighting alternative state-of-the-art microfluidic devices that offer avenues for fast, cost-effective, precision-oriented capture and sensing of extracellular vesicles. Combining different detection technologies on an integrated "lab-on-a-chip" system has the prospective to provide customizable opportunities for clinical use of extracellular vesicles in disease diagnostics and therapeutic applications.
Size and shape evolution of upconverting nanoparticles using microwave assisted synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B927225A
Green Synthesized Carbon Quantum Dots/Cobalt Sulfide Nanocomposite as Efficient Electrode Material for Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 24-05-2021
High Voltage Carbon‐Based Cathodes for Non‐Aqueous Aluminium‐Ion Batteries**
Publisher: Wiley
Date: 29-12-2020
3D micro-printing of optical temperature probes
Publisher: Springer Netherlands
Date: 2017
A TiO2 Nanofiber-Carbon Nanotube-Composite Photoanode for Improved Efficiency in Dye-Sensitized Solar Cells
Publisher: Wiley
Date: 18-09-2015
Abstract: A light-scattering layer fabricated from electrospun titanium dioxide nanofibers (TiO2 -NFs) and single-walled carbon nanotubes (SWCNTs) formed a fiber-based photoanode. The nanocomposite scattering layer had a lawn-like structure and integration of carbon nanotubes into the NF photoanodes increased the power conversion efficiency from 2.9 % to 4.8 % under 1 Sun illumination. Under reduced light intensity (0.25 Sun), TiO2 -NF and TiO2 -NF/SWCNT-based DSSCs reached PCE values of up to 3.7 % and 6.6 %, respectively.
Photometric Sensing of Active Chlorine, Total Chlorine, and pH on a Microfluidic Chip for Online Swimming Pool Monitoring
Publisher: MDPI AG
Date: 30-05-2020
DOI: 10.3390/S20113099
Abstract: A microfluidic sensor was studied for the photometric detection of active chlorine, total chlorine, and pH in swimming pool s les. The sensor consisted of a four-layer borosilicate glass chip, containing a microchannel network and a 2.2 mm path length, 1.7 mL optical cell. The chip was optimised to measure the bleaching of methyl orange and spectral changes in phenol red for quantitative chlorine (active and total) and pH measurements that were suited to swimming pool monitoring. Reagent consumption (60 mL per measurement) was minimised to allow for maintenance-free operation over a nominal summer season (3 months) with minimal waste. The chip was tested using s les from 12 domestic, public, and commercial swimming pools (indoor and outdoor), with results that compare favourably with commercial products (test strips and the N,N’-diethyl-p-phenylenediamine (DPD) method), precision pH electrodes, and iodometric titration.
Gas-sensing properties of p-type α-Fe2O3 polyhedral particles synthesized via a modified polyol method
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3RA46410E
Electrochemical metallization of self-assembled porphyrin monolayers
Publisher: Springer Science and Business Media LLC
Date: 08-2002
DOI: 10.1007/S00216-002-1342-7
Abstract: Multifunctional sensor systems are becoming increasingly important in electroanalytical chemistry. Together with ongoing miniaturization there is a need for micro- and nanopatterning tools for thin electroactive layers (e.g. self-assembling monolayers). This paper documents a method for production of a micro-array of different metal-porphyrin monolayers with different sensor properties. A new method has been developed for the selective and local metallization of bare porphyrin monolayers by cathodic pulsing and sweeping. The metal-porphyrin monolayers obtained were characterized by cyclic voltammetry. It was shown that porphyrin monolayers can be metallized with manganese, iron, cobalt, and nickel by use of the new method. It is expected that all types of metal-porphyrin monolayers can be produced in the same manner.
A facile method for coding and labeling assays on polystyrene beads with differently colored luminescent nanocrystals
Publisher: Springer Science and Business Media LLC
Date: 19-01-2006
DOI: 10.1007/S00216-005-0244-X
Abstract: The present paper describes a new, facile and fast technique that can be used to incorporate CdSe/ZnS core/shell nanocrystals into polystyrene beads. The nanocrystals were immobilized within the polymer beads by demixing two nonmiscible solvents. The resulting beads were bright, homogeneously coded, and did not show any surface texture or photobleaching under application-relevant conditions. The beads were subsequently used on a model streptavidin-biotin binding system in order to demonstrate the applicability of the technique to enzyme-linked assays and multiplexing applications.
A thin silica-polymer shell for functionalizing colloidal inorganic nanoparticles
Publisher: Wiley
Date: 14-09-2011
Read-out concepts for multiplexed bead-based fluorescence immunoassays on centrifugal microfluidic platforms
Publisher: Elsevier BV
Date: 02-2006
Fluorescence Lifetime Multiplexing with Nanocrystals and Organic Labels
Publisher: American Chemical Society (ACS)
Date: 25-08-2009
DOI: 10.1021/AC900934A
Abstract: The potential of semiconducting nanocrystals or so-called quantum dots (QDs) for lifetime multiplexing has not been investigated yet, despite the increasing use of QDs in (bio)analytical detection, biosensing, and fluorescence imaging and the obvious need for simple and cost-effective tools and strategies for the simultaneous detection of multiple analytes or events. This is most likely related to their multiexponential decay behavior as for multiplex chromophores, typically monoexponential decay kinetics are requested. The fluorescence decay kinetics of various mixtures of a long-lived, multiexponentially decaying CdSe QD and a short-lived organic dye were analyzed, and a model was developed for the quantification of these labels from the measured complex decay kinetics as a first proof-of-concept for the huge potential of these labels for lifetime multiplexing. In a second step, we evaluated the potential of mixtures of two types of QDs, varying in constituent material to realize distinguishable, yet multiexponential decay kinetics and similar absorption and emission spectra. Strategies for lifetime multiplexing with nanocrystalline labels were derived on the basis of these measurements.
Cover Feature: High Voltage Carbon‐Based Cathodes for Non‐Aqueous Aluminium‐Ion Batteries (ChemElectroChem 3/2021)
Publisher: Wiley
Date: 14-01-2021
On the Use of pH Titration to Quantitatively Characterize Colloidal Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 17-10-2012
DOI: 10.1021/LA302570S
Abstract: Functional nanoparticles (NPs) for bioapplications have been achieved, thanks to synthesis providing high quality nanocrystals, efficient procedures for transfer in water, and further conjugation of (bio)active molecules. However, these nanomaterials are still subjected to batch-to-batch variability and investigations of their physicochemical properties and chemical reactivity are still in their infancy. This may be due to lack of a routine, cost-effective, and readily available quantitative method for characterizing functional NPs. In this work, we show that pH titrations can be a powerful tool for investigating the surface properties of charged NPs and quantifying their surface functionalities. We demonstrate how this method can be useful in characterizing the colloidal and chemical stability, composition, and purity of the nanomaterial. The method also shows potential for the optimization of conjugation conditions.
Doping Group IIB Metal Ions into Quantum Dot Shells via the One‐Pot Decomposition of Metal‐Dithiocarbamates
Publisher: Wiley
Date: 24-02-2015
One-pot synthesis of YF3@silica core/shell nanoparticles
Publisher: No publisher found
Date: 2006
DOI: 10.1039/B516171A
Abstract: A new one-pot synthetic method for preparing core/shell YF3@SiO2 nanoparticles with different morphologies, from spherical to elongated structures ("pearl necklace"), is described absorbance and photoluminescence spectroscopy reveals intrinsic but no extrinsic defects in the YF3.
High-Quality ZnS Shells for CdSe Nanoparticles: Rapid Microwave Synthesis
Publisher: American Chemical Society (ACS)
Date: 07-06-2007
DOI: 10.1021/LA063528B
Abstract: Using a domestic microwave oven and new, inexpensive precursors, a rapid and reliable synthesis of highly luminescent CdSe/ZnS NPs was developed. To evaluate the quality of our core/shell particles for varying shell thickness in comparison to that of CdSe/ZnS nanoparticles obtained commercially, the parameter fluorescence quantum yield is been used as well as a new, straightforward, thiophenol-based shell-quality test as a tool to ensure a dense ZnS shell without holes and cracks, which is a prerequisite for high luminescence and stability.
Electrophoretic properties of BSA-coated quantum dots
Publisher: Springer Science and Business Media LLC
Date: 13-09-2010
DOI: 10.1007/S00216-009-3107-Z
Abstract: Low toxic InP/ZnS quantum dots (QDs), ZnS:Mn(2+)/ZnS nanocrystals and CdSe/ZnS nanoparticles were rendered water-dispersible by different ligand-exchange methods. Eventually, they were coated with bovine serum albumin (BSA) as a model protein. All particles were characterised by isotachophoresis (ITP), laser Doppler velocimetry (LDV) and agarose gel electrophoresis. It was found that the electrophoretic mobility and colloidal stability of ZnS:Mn(2+)/ZnS and CdSe/ZnS nanoparticles, which bore short-chain surface ligands, was primarily governed by charges on the nanoparticles, whereas InP/ZnS nanocrystals were not charged per se. BSA-coated nanoparticles showed lower electrophoretic mobility, which was attributed to their larger size and smaller overall charge. However, these particles were colloidally stable. This stability was probably caused by steric stabilisation of the BSA coating.
{Ni4O4} Cluster Complex to Enhance the Reductive Photocurrent Response on Silicon Nanowire Photocathodes
Publisher: MDPI AG
Date: 06-02-2017
DOI: 10.3390/NANO7020033
Conducting Copper(I/II)-Metallopolymer for the Electrocatalytic Oxygen Reduction Reaction (ORR) with High Kinetic Current Density
Publisher: MDPI AG
Date: 07-09-2018
Abstract: The oxygen reduction reaction (ORR) is still the most research-intensive aspect of a fuel cell. The sluggish kinetics of the electrocatalysts toward the ORR requires large amounts of platinum to be used as cathode material, which calls for alternatives to replace or minimize the amount of the noble metals used. This study describes the synthesis and complete characterization of a copper metallopolymer (Cu MP) based on a conducting polymer (CP) and single-site catalytic centers for the electrocatalytic ORR. The copper (II) catalyst, embedded in a redox-active and conducting polymeric environment, was pursued as a potential candidate to replace noble metals in fuel cell applications. Performance studies at a rotating disk electrode (RDE) showed that the metallopolymer exhibited a direct four-electron reduction at potentials between −150 and −350 mV vs. the reversible hydrogen electrode (RHE) and high kinetic current densities of over 22.62 mA/cm2. The kinetic current densities obtained at the Cu MP electrode outperformed most of the reported state-of-the art electrocatalysts toward the ORR. Further analysis of the Cu/CP hybrid revealed the copper being largely reduced to the oxidation state +I.
A quantum dot sensitized catalytic porous silicon photocathode
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01677G
Abstract: The fabrication and characterisation of a nano-structured photocathode using indium phosphide QDs and a bio-inspired Fe 2 S 2 (CO) 6 catalyst sensitized on a p-type porous silicon electrode.
A four-color colloidal multiplexing nanoparticle system
Publisher: American Chemical Society (ACS)
Date: 04-01-2008
DOI: 10.1021/NN7002458
Abstract: Any labeling with multicolor markers can be affected by the autofluorescence of biological tissue due to the UV or blue light excitation sources, or the results are affected by fluorescence resonance energy transfer. In this work, we present novel IR-to-vis upconverting nanoparticles of different rare earth metal dopants. With a single excitation source of 980 nm, four different colors of nanocrystals can be spectrally separated under multiplexing conditions. The particles were phase transferred into polar solvents by means of silica encapsulation and were characterized by transmission electron microscopy, X-ray diffraction, and photoluminescence spectroscopy.
Porous silicon nanoparticles as a nanophotocathode for photoelectrochemical water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA12559F
Abstract: An investigation on the nanophotocathode fabrication using electrochemically anodised pSi NPs for photoelectrochemical water splitting.
The power of heterogeneity: Parameter relationships from distributions
Publisher: Public Library of Science (PLoS)
Date: 16-05-2016
Molybdenum Dichalcogenide Cathodes for Aluminum‐Ion Batteries
Publisher: Wiley
Date: 22-04-2020
Water Splitting by Visible Light: A Nanophotocathode for Hydrogen Production
Publisher: Wiley
Date: 17-02-2010
Determination of defect states in semiconductor nanocrystals by cyclic voltammetry
Publisher: American Chemical Society (ACS)
Date: 07-10-2005
DOI: 10.1021/JP053891B
Abstract: Colloidal, monodisperse CdSe nanocrystals were homogeneously dispersed in an ionic liquid and investigated by means of cyclic voltammetry. Almost all known defect states in semiconductor nanocrystal were quantitatively measured with this nonoptical method (including nonradiative defect states). Variation of the illumination and temperature resulted in excitation of defect-trapped electrons into the conducting band. Thus, we succeeded for the first time to correlate defect states in nanocrystals with those in the corresponding bulk crystals.
Blue shift of CdSe/ZnS nanocrystal-labels upon DNA-hybridization
Publisher: Springer Science and Business Media LLC
Date: 05-2008
Abstract: Luminescence color multiplexing is one of the most intriguing benefits, which might occur by using semiconductor Quantum Dots (QDs) as labels for biomolecules. It was found, that the luminescence of QDs can be quenched, and replaced by a luminescence peak at approximately 460 nm on hybridization with certain regions of Arabidopsis thaliana tissue. This effect is site selective, and it is unclear whether it occurs due to an energy transfer process, or due to quenching and scattering of the excitation light. The article describes methods for phase-transfer of differently coloured, hydrophobically ligated QDs, coupling of DNA strands to the QD's surface, and hybridization of the labelled DNA to different cell types of Arabidopsis thaliana . The reason for the luminescence blue-shift was studied systematically, and narrowed down to the above mentioned causes.
Electrophoretic analysis of gold nanoparticles: Size-dependent electrophoretic mobility of nanoparticles
Publisher: Institution of Engineering and Technology (IET)
Date: 2006
Abstract: Efforts were made to realise a two-dimensional, on-line-coupled isotachophoresis-capillary zone electrophoresis system. The electrophoretic behaviour of gold nanoparticles was investigated with the idea that they could be used to improve the control of this electrophoretic set-up. The well-known citrate-ligated gold nanoparticles were not suitable for this application, because the ligand was desorbed, and the nanoparticle solutions were degraded. Therefore mercaptocarboxylic acids were used, because the chemisorption of thiols on the gold surface was improved. Isotachophoretic measurements were carried out with these nanoparticles. A size-dependent electrophoretic mobility was found according to theoretical predictions, and the surface and zeta-potential were discussed for the small particle range. A new method for concentration measurements of nanoparticles is presented by means of isotachophoresis.
Simulation in electrochemistry using the finite element method part 2: Scanning electrochemical microscopy
Publisher: Elsevier BV
Date: 11-2003
Plasmon-enhanced upconversion in single NaYF4:Yb 3+/Er3+ codoped nanocrystals
Publisher: American Chemical Society (ACS)
Date: 18-12-2010
DOI: 10.1021/NL903046R
Abstract: In this Letter we report the plasmon-enhanced upconversion in single NaYF(4) nanocrystals codoped with Yb(3+)/Er(3+). Single nanocrystals and gold nanospheres are investigated and assembled in a combined confocal and atomic force microscope setup. The nanocrystals show strong upconversion emission in the green and red under excitation with a continuous wave laser in the near-infrared at 973 nm. By the use of the atomic force microscope, we couple single nanocrystals with gold spheres (30 and 60 nm in diameter) to obtain enhanced upconversion emission. An overall enhancement factor of 3.8 is reached. A comparison of time-resolved measurements on the bare nanocrystal and the coupled nanocrystal-gold sphere systems unveil that faster excitation as well as faster emission occurs in the nanocrystals.
Quantitative analysis of cadmium selenide nanocrystal concentration by comparative techniques
Publisher: American Chemical Society (ACS)
Date: 31-10-2007
DOI: 10.1021/AC0715064
Abstract: In this paper, we compared atomic absorption spectroscopy (AAS), anodic stripping voltammetry (ASV), and UV-vis spectroscopy for the determination of the concentration of CdSe nanocrystal (NC) solutions. The experimental results were combined with crystallographic calculations of the NC size, which led to a very accurate determination of the nanocrystal concentration--a crucial parameter for bioanalytical applications. Furthermore, such a combined approach can be extended to the determination of shell thickness of core/shell materials (e.g., CdSe/ZnS).
Single quantum dots in silica spheres by microemulsion synthesis
Publisher: American Chemical Society (ACS)
Date: 15-10-2005
DOI: 10.1021/CM051467H
Size-controlled, high optical quality ZnO nanowires grown using colloidal Au nanoparticles and ultra-small cluster catalysts
Publisher: AIP Publishing
Date: 28-12-2018
DOI: 10.1063/1.5054355
Abstract: Size-controlled ZnO nanowires were grown by eclipse pulsed laser deposition using Au colloids and ultra-small (sub 2 nm) Au101 and Au9 clusters as catalysts, tethered to c-plane sapphire substrates using aminopropyltrimethoxysilane (APTMS). A strong correlation was observed between ZnO nanowire tip diameter and Au catalyst size, with no apparent lower limit to the size of Au nanoparticles able to catalyze nanowire growth. All ZnO nanowires produced intense ultraviolet photoluminescence with almost no visible defect band emission that is commonly observed in ZnO-based materials, including nanowires. A correlation was also observed between the quality of the ultraviolet photoluminescence (in terms of decreasing exciton line widths and surface-related emission) and decreasing ZnO nanowire diameter, with the highest quality emission obtained using Au9 atomically precise cluster catalysts, used here as catalysts for ZnO growth for the first time.
Colloidal Quantum Dots in All-Dielectric High-Q Pillar Microcavities
Publisher: American Chemical Society (ACS)
Date: 28-08-2007
DOI: 10.1021/NL071812X
Abstract: We have fabricated all-dielectric high-Q optical pillar resonators with embedded colloidal CdSe/ZnS quantum dots or rods as light emitters by focused ion beam milling. Three-dimensional light confinement and distinct pillar microcavity modes are observed. Results from a waveguide model for the mode patterns and their spectral positions are in excellent agreement with the experimental data. Cavities with elliptical cross sections show higher quality factors in the short axis direction than do circular resonators of the same cross-sectional area.
Improved uniaxial dielectric properties in aligned diisopropylammonium bromide (DIPAB) doped poly(vinylidene difluoride) (PVDF) nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9RA06470B
Abstract: Diisopropylammonium bromide (DIPAB) doped poly(vinylidene difluoride) (PVDF) nanofibers (5, 10 and 24 wt% DIPAB doping) with improved and tunable dielectric properties were synthesised via electrospinning.
Electroactive Polyhydroquinone Coatings for Marine Fouling Prevention—A Rejected Dynamic pH Hypothesis and a Deceiving Artifact in Electrochemical Antifouling Testing
Publisher: American Chemical Society (ACS)
Date: 21-08-2017
SWCNT photocathodes sensitised with InP/ZnS core-shell nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TC03833B
Abstract: Increasing the light harvesting efficiency of photocathodes is an integral part of optimising the future efficiencies of solar technologies.
Quantum dots versus organic dyes as fluorescent labels
Publisher: Springer Science and Business Media LLC
Date: 28-08-2008
DOI: 10.1038/NMETH.1248
Monofunctionalization and Dimerization of Nanoparticles Using Coordination Chemistry
Publisher: American Chemical Society (ACS)
Date: 21-01-2015
DOI: 10.1021/NN5058408
Controlled synthesis and characterization of iron oxide nanostructures with potential applications for gas sensors and the environment
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3RA45925J
Acetamide: a low-cost alternative to alkyl imidazolium chlorides for aluminium-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC04468F
Abstract: Acetamide forms a room temperature liquid eutectic with AlCl 3 , which can be used as a low-cost electrolyte for aluminium-ion batteries.
Optical and Surface Characterisation of Capping Ligands in the Preparation of InP/ZnS Quantum Dots
Publisher: American Scientific Publishers
Date: 08-2009
Rapid microwave assisted synthesis of nearly monodisperse aqueous CuInS2 /ZnS nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CE01325A
Abstract: A rapid microwave-assisted synthesis for nearly monodisperse CuInS 2 /ZnS nanocrystals (NCs) has been developed.
Excitation dependence of steady-state photoluminescence in CdSe nanocrystal films
Publisher: American Chemical Society (ACS)
Date: 14-12-2015
DOI: 10.1021/JP052229C
Abstract: The excitonic and deep-level photoluminescence (PL) in CdSe nanocrystal (NC) films (wurtzite type) was studied under continuous-wave excitation as a function of excitation power, temperature, and time of photoaging. It was shown that the intensity-power dependencies are identical for excitonic and deep-level emissions in a wide temperature range. At low temperatures (80-100 K), both emissions were saturated at the laser power used, which generates more than one exciton per nanocrystal. A transition point from the linear to the saturated region was dependent on the temperature, size, and quality of the NCs. A clear inverse dependency between the intensities of excitonic and deep-level emissions was revealed at 80 K over the entire s le area. At room-temperature, the quantum yield dropped significantly and a higher laser power was needed to reach PL saturation. An increase in temperature led to worsening of the reverse dependence between excitonic and deep-level emissions, and at room-temperature, they became uncorrelated. These results can be explained by Auger recombination and also by an increase of nonradiative recombination in the surface states with increasing temperature.
Copper‐Doped CdSe/ZnS Quantum Dots: Controllable Photoactivated Copper(I) Cation Storage and Release Vectors for Catalysis
Publisher: Wiley
Date: 27-12-2013
Polyethyleneimine for copper absorption II: kinetics, selectivity and efficiency from seawater
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA08029K
Abstract: Nano-thin coatings of glutaraldehyde cross-linked polyethyleneimine effectively and selectively accumulated copper from natural seawater.
Silica coated, water dispersible and photoluminescent y (V,P)O 4:Eu3+,Bi3+ nanophosphors
Publisher: IOP Publishing
Date: 08-2006
DOI: 10.1088/0957-4484/17/16/029
Abstract: We propose an approach for silica encapsulation of YV((0.7))P((0.3))O(4):Eu(3+), Bi(3+) nanophosphors through a microemulsion process. The resulting YV((0.7))P((0.3))O(4):Eu(3+), Bi(3+)@SiO(2) core-shell nanophosphors were characterized by transmission electron microscopy, UV/vis absorption and photoluminescence spectroscopy, energy-dispersive x-ray analysis (EDAX), selected area electron diffraction and zeta-potential measurements. The obtained nanocomposites have quite a uniform spherical shape and diameters of about 15 nm. Zeta-potential measurements show that coated particles are stable at high volume fractions and can endure large variations in pH and electrolyte concentration without coalescence. These core-shell nanophosphors could also be used as ultrasensitive biological labels, because they are obtained in nanoscale and well dispersible in water.
Quantum confinement of the thermodynamic functions for the formation of electrons and holes in CdSe nanocrystals
Publisher: AIP Publishing
Date: 10-2006
DOI: 10.1063/1.2356607
Abstract: The particle size dependent thermodynamic functions for the formation of electrons and holes are addressed for semiconductor CdSe nanocrystals (NCs). We recorded the temperature dependent absorbance spectra for a size series of colloidal CdSe NCs in a polymer composite material and analyzed the band-gap behavior. We report the analytical investigation of the temperature dependent band gap as a function of the particle size using two common theoretical approaches. The band gap as a function of temperature and particle size is mainly influenced by the large entropic values for the formation of electrons and holes.
Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5PY01245G
Abstract: In this work, we compare the effect of incorporating selenophene versus thienothiophene spacers into pentacyclic lactam-based conjugated polymers for organic solar cells.
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Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP160104196
Start Date: 03-2016
End Date: 12-2019
Amount: $441,295.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100040
Start Date: 2015
End Date: 12-2016
Amount: $330,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE200100033
Start Date: 2020
End Date: 03-2022
Amount: $1,200,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE140100193
Start Date: 2014
End Date: 12-2014
Amount: $700,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE160100035
Start Date: 2016
End Date: 12-2016
Amount: $370,000.00
Funder: Australian Research Council
View Funded Activity