ORCID Profile
0000-0001-9948-5893
Current Organisation
RMIT University
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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.
Functional Materials | Nanotechnology | Nanomaterials | Physical Chemistry of Materials | Nanofabrication, Growth and Self Assembly | Photodetectors, Optical Sensors and Solar Cells | Materials Engineering | Electrochemistry | Nanotechnology not elsewhere classified
Hydrogen Production from Renewable Energy | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in Engineering | Expanding Knowledge in Technology | Solar-Photovoltaic Energy | Expanding Knowledge in the Physical Sciences | Industrial Chemicals and Related Products not elsewhere classified | Integrated Circuits and Devices |
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC04838C
Abstract: A reliable synthesis for pure and doped BaSnO 3 nanoparticles is presented, solving current irreproducibility issues affecting this emerging transparent conducting oxide.
Publisher: MDPI AG
Date: 30-04-2020
DOI: 10.3390/NANO10050863
Abstract: Fluorine-doped tin oxide (FTO) is one of the most studied and established materials for transparent electrode applications. However, the syntheses for FTO nanocrystals are currently very limited, especially for stable and well-dispersed colloids. Here, we present the synthesis and detailed characterization of FTO nanocrystals using a colloidal heat-up reaction. High-quality SnO2 quantum dots are synthesized with a tuneable fluorine amount up to ~10% atomic, and their structural, morphological and optical properties are fully characterized. These colloids show composition-dependent optical properties, including the rise of a dopant-induced surface plasmon resonance in the near infrared.
Publisher: Elsevier BV
Date: 04-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM03494K
Publisher: Wiley
Date: 19-05-2016
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 30-05-2023
Abstract: Antimony chalcogenide, Sb 2 X 3 (X = S, Se), applications greatly benefit from efficient charge transport along covalently bonded (001) oriented (Sb 4 X 6 ) n ribbons, making thin film orientation control highly desirable – although particularly hard to achieve experimentally. Here, it is shown for the first time that substrate nanostructure plays a key role in driving the growth of (001) oriented antimony chalcogenide thin films. Vapor Transport Deposition of Sb 2 Se 3 thin films is conducted on ZnO substrates whose morphology is tuned between highly nanostructured and flat. The extent of Sb 2 Se 3 (001) orientation is directly correlated to the degree of substrate nanostructure. These data showcase that nanostructuring a substrate is an effective tool to control the orientation and morphology of Sb 2 Se 3 films. The optimized s les demonstrate high (001) crystallographic orientation. A growth mechanism for these films is proposed, wherein the substrate physically restricts the development of undesirable crystallographic orientations. It is shown that the surface chemistry of the nanostructured substrates can be altered and still drive the growth of (001) Sb 2 Se 3 thin films – not limiting this phenomenon to a particular substrate type. Insights from this work are expected to guide the rational design of Sb 2 X 3 thin film devices and other low‐dimensional crystal‐structured materials wherein performance is intrinsically linked to morphology and orientation.
Publisher: Springer Science and Business Media LLC
Date: 29-11-2018
DOI: 10.1038/S41467-018-07396-3
Abstract: Silicon-based impurities are ubiquitous in natural graphite. However, their role as a contaminant in exfoliated graphene and their influence on devices have been overlooked. Herein atomic resolution microscopy is used to highlight the existence of silicon-based contamination on various solution-processed graphene. We found these impurities are extremely persistent and thus utilising high purity graphite as a precursor is the only route to produce silicon-free graphene. These impurities are found to h er the effective utilisation of graphene in whereby surface area is of paramount importance. When non-contaminated graphene is used to fabricate supercapacitor microelectrodes, a capacitance value closest to the predicted theoretical capacitance for graphene is obtained. We also demonstrate a versatile humidity sensor made from pure graphene oxide which achieves the highest sensitivity and the lowest limit of detection ever reported. Our findings constitute a vital milestone to achieve commercially viable and high performance graphene-based devices.
Publisher: Wiley
Date: 08-05-2023
Abstract: We report a new composite material consisting of silver nanoparticles decorated with three‐dimensional molecular organic cages based on light‐absorbing porphyrins. The porphyrin cages serve to both stabilize the particles and allow diffusion and trapping of small molecules close to the metallic surface. Combining these two photoactive components results in a Fano‐resonant interaction between the porphyrin Soret band and the nanoparticle‐localised surface‐plasmon resonance. Time‐resolved spectroscopy revealed the silver nanoparticles transfer up to 37 % of their excited‐state energy to the stabilising layer of porphyrin cages. These unusual photophysics cause a 2‐fold current increase in photoelectrochemical water‐splitting measurements. The composite structure provides a compelling proof of concept for advanced photosensitiser systems with intrinsic porosity for photocatalytic and sensing applications.
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Chemical Society (ACS)
Date: 28-10-2016
Abstract: Highly doped wide band gap metal oxide nanocrystals have recently been proposed as building blocks for applications as transparent electrodes, electrochromics, plasmonics, and optoelectronics in general. Here we demonstrate the application of gallium-doped zinc oxide (GZO) nanocrystals as novel plasmonic and chemiresistive sensors for the detection of hazardous gases including hydrogen (H
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC02429C
Abstract: The first colloidal synthesis of Ge-doped ZnO nanocrystals is presented. Ge dopants induce a surface plasmon resonance in the infrared and affect the ZnO nanocrystal morphology.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC00681G
Abstract: A novel architecture for quasi-interdigitated electrodes (QIDEs) allows for the fabrication of back-contacted perovskite solar cells.
Publisher: American Chemical Society (ACS)
Date: 05-02-2020
Publisher: American Chemical Society (ACS)
Date: 12-08-2022
Publisher: Wiley
Date: 28-01-2022
Abstract: Plasmonic and other nanoparticles have attracted considerable interest for their role in structural coloration. The optical “Janus” effect, where the color of light reflected from a partially transmitting film depends on whether the device is viewed from the substrate or the coating side, is observed using a variety of nanostructured films. Herein, the optical Janus effect produced by homogeneous thin‐film structures comprising only four layers of three different materials with a total thickness less than is demonstrated. An asymmetric Fabry–Perot (FP) nanocavity is formed with a dielectric film bounded by two different metal films of nanoscale thickness. The semitransparent device has a transmitted color that is independent of the viewing direction. A broad color palette is available through the selection of various thicknesses and film materials. In addition to the directional optical effect, the device possesses iridescence properties and can generate images by selective removal of regions of one of the metallic films using simple photolithography. From a manufacturing perspective, this device is scalable and holds significant promise for applications in architecture, producing decorative features, and the development of overt and covert security features.
Publisher: Elsevier BV
Date: 2012
Publisher: IOP Publishing
Date: 08-06-2017
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1569
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 11-2011
Publisher: American Chemical Society (ACS)
Date: 19-10-2011
DOI: 10.1021/LA2032829
Abstract: In this work, we provide a detailed study of the influence of thermal annealing on submonolayer Au nanoparticle deposited on functionalized surfaces as standalone films and those that are coated with sol-gel NiO and TiO(2) thin films. The systems are characterized through the use of UV-vis absorption, X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and spectroscopic ellipsometry. The surface plasmon resonance peak of the Au nanoparticles was found to red-shift and increase in intensity with increasing surface coverage, an observation that is directly correlated to the complex refractive index properties of Au nanoparticle layers. The standalone Au nanoparticles sinter at 200 °C, and a relationship between the optical properties and the annealing temperature is presented. When overcoated with sol-gel metal oxide films (NiO, TiO(2)), the optical properties of the Au nanoparticles are strongly affected by the metal oxide, resulting in an intense red shift and broadening of the plasmon band moreover, the temperature-driven sintering is strongly limited by the metal oxide layer. Optical sensing tests for ethanol vapor are presented as one possible application, showing reversible sensing dynamics and confirming the effect of Au nanoparticles in increasing the sensitivity and in providing a wavelength dependent response, thus confirming the potential use of such materials as optical probes.
Publisher: Springer Science and Business Media LLC
Date: 2013
DOI: 10.1557/OPL.2013.713
Abstract: The oscillatory change in the optical absorbance of NiO-TiO 2 film containing Au nanoparticles in the presence of H 2 S gas are investigated. The oscillatory phenomena could be monitored by looking at the variation of the surface plasmon resonance peak of the Au nanoparticles embedded in the TiO 2 -NiO matrix. Au nanoparticles act as optical probes in the detection of H 2 S, while the oxide matrix is responsible for the catalytic oxidation of H 2 S. To the best of our knowledge, it is the first time that oscillatory phenomena are monitored by optical spectroscopy.
Publisher: Elsevier BV
Date: 07-2021
Publisher: Wiley
Date: 06-12-2016
DOI: 10.1111/ACPS.12532
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Chemical Society (ACS)
Date: 23-12-2023
Publisher: Wiley
Date: 05-11-2015
Publisher: Wiley
Date: 24-09-2023
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1571
Publisher: Elsevier BV
Date: 03-2012
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1570
Publisher: Wiley
Date: 17-10-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CP00746E
Abstract: Cathodoluminescence analysis in Ga-doped ZnO nanoparticles showed a strong dependence of defect-induced emissions on both dopant content and synthesis methods. The physical origin of all the sub-bands could be clarified, and related to s le composition and synthesis protocol.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR05926F
Abstract: Various non-stratified two-dimensional (2D) materials can be obtained from liquid metal surfaces that are not naturally accessible.
Publisher: American Chemical Society (ACS)
Date: 31-10-2013
DOI: 10.1021/AM403227C
Abstract: We have devised a moderate temperature hot-pressing route for preparing metal-matrix composites which possess tunable thermal expansion coefficients in combination with high electrical and thermal conductivities. The composites are based on incorporating ZrW2O8, a material with a negative coefficient of thermal expansion (CTE), within a continuous copper matrix. The ZrW2O8 enables us to tune the CTE in a predictable manner, while the copper phase is responsible for the electrical and thermal conductivity properties. An important consideration in the processing of these materials is to avoid the decomposition of the ZrW2O8 phase. This is accomplished by using relatively mild hot-pressing conditions of 500 °C for 1 h at 40 MPa. To ensure that these conditions enable sintering of the copper, we developed a synthesis route for the preparation of Cu nanoparticles (NPs) based on the reduction of a common copper salt in aqueous solution in the presence of a size control agent. Upon hot pressing these nanoparticles at 500 °C, we are able to achieve 92-93% of the theoretical density of copper. The resulting materials exhibit a CTE which can be tuned between the value of pure copper (16.5 ppm/°C) and less than 1 ppm/°C. Thus, by adjusting the relative amount of the two components, the properties of the composite can be designed so that a material with high electrical conductivity and a CTE that matches the relatively low CTE values of semiconductor or thermoelectric materials can be achieved. This unique combination of electrical and thermal properties enables these Cu-based metal-matrix composites to be used as electrical contacts to a variety of semiconductor and thermoelectric devices which offer stable operation under thermal cycling conditions.
Publisher: Informa UK Limited
Date: 10-07-2014
DOI: 10.1080/07399332.2014.916294
Abstract: In this study the authors explore the impact of protective factors on the health and well-being of grandmothers who are primary caregivers. Although researchers in Africa have studied grandparents who assume primary caregiving responsibilities, it is rare that they do so from a strength perspective, hence the need to examine the utility of personal, social, and environmental assets on caregiving. Grandmothers are the primary caregivers of orphaned children due to HIV and AIDS deaths thus it becomes pertinent to establish how they are coping without the provision of social security. The results of this study will be beneficial to all stakeholders interested in the welfare of elders with similar responsibilities. Knowledge about the health and well-being of grandmothers who are caregivers will assist public service and private sectors to formulate viable policies concerning elderly carers who foster orphans, particularly in countries with high HIV prevalence.
Publisher: Wiley
Date: 15-10-2016
Abstract: The role of the interface between an MoOx anode interlayer and a polymer:fullerene bulk heterojunction is investigated. Processing differences in the MoOx induce large variations in the vertical stratification of the bulk heterojunction films. These variations are found to be inconsistent in predicting device performance, with a much better gauge being the quantity of polymer chemisorbed to the anode interlayer.
Publisher: IOP Publishing
Date: 12-05-2023
Abstract: Post transition metal chalcohalides are an emerging class of semiconductor materials for optoelectronic applications. Within this class, bismuth oxyiodide (BiOI) is of particular interest due to its high environmental stability, low toxicity, and defect tolerance considered typical of ‘ns 2 ’ materials. Here we fabricate BiOI thin films using a solution-processed method that affords pin-hole free highly pure films without any residual carbon or other contaminant species. Based on these films, solution processed all-inorganic solar cells with an architecture ITO/NiO x /BiOI/ZnO/Al are fabricated for the first time. Additional device improvements are realised by templating BiOI thin film growth to attain efficiencies that rival some of the best vacuum deposited devices. The BiOI thin films and devices outlined here are an excellent platform for the further development of solution processed bismuth chalcohalide optoelectronic devices.
Publisher: American Chemical Society (ACS)
Date: 16-04-2015
DOI: 10.1021/JP512611M
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC00605B
Abstract: Hydrophobic electrically conductive D–π–D porphyrin hole-extracting materials for printable perovskite solar cells the device efficiency reached 11.26% with a carbon naoparticle–graphene composite as a cathode and exhibited better durability.
Publisher: Wiley
Date: 17-05-2022
Abstract: Herein, an in‐depth experimental investigation into the effect of employing different high resistance metal oxide (HRMO) layers on the quality of the front contact in solar cells with an fluorine‐doped tin oxide (FTO)/(HRMO)/CdS/Sb 2 Se 3 /Au device architecture is presented. The application of ZnO or TiO 2 HRMO layers between FTO substrates and CdS improves the overall device performance. Short‐circuit current gains of ≈20%, orders of magnitude higher shunt resistances (≈10 4 Ω cm 2 ), and greatly improved device stabilities—maintaining over 95% of their initial efficiency over 137 days are observed. A suppression of the unfavorable (120) orientation of the photoactive Sb 2 Se 3 layer is observed in devices with HRMO interlayers. The application of HRMO layers is crucial to prevent both ohmic and non‐ohmic current leaks and maintain device stability over time. Cross‐over in the current‐voltage ( JV ) curves observed in the case of TiO 2 indicates the presence of a high barrier for the diode current in these devices. Wavelength‐dependent JV curves coupled with capacitance measurements and simulations show that this barrier can be attributed to a high density of interfacial acceptor states. In contrast, ZnO deposition is found to reduce interface defects and enhance the quality of the front contact, while boosting performance and increasing device longevity.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR04326G
Abstract: Two-dimensional (2D) transition metal chalcogenides such as 2D MoS
Publisher: Springer Science and Business Media LLC
Date: 24-05-2011
Publisher: American Chemical Society (ACS)
Date: 11-05-2010
DOI: 10.1021/CM100297Q
Publisher: AIP Publishing
Date: 08-05-2014
DOI: 10.1063/1.4875381
Abstract: The effect of doping and porosity of the n-type ZnO layer on the performance of solution-processed, sintered p-CdTe/n-ZnO nanocrystal photovoltaic (PV) devices is investigated. Amorphous sol-gel ZnO is found to be the best candidate with overall energy conversion efficiencies above 8% obtained if the ZnO is also indium doped. We demonstrate that when such PV devices are left under forward bias (in dark or light), the device efficiency values are raised to at least 9.8%, due to a substantially increased open-circuit voltage and fill-factor. This drastic enhancement is attributed to improved band alignment at the ITO/CdTe interface. The forward-bias treatment is slowly reversed over a period of days to weeks on standing under open circuit conditions, but is readily restored with further voltage treatment. The moderate processing conditions and high efficiency of such devices demonstrate that nanocrystal-based systems are a promising technology for photovoltaics.
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 06-2020
Publisher: American Chemical Society (ACS)
Date: 24-07-2019
Abstract: In this report, the gas sensing performance of zinc titanate (ZnTiO
Publisher: American Chemical Society (ACS)
Date: 23-09-2014
DOI: 10.1021/CM501393H
Publisher: American Chemical Society (ACS)
Date: 04-04-2020
Publisher: Wiley
Date: 05-06-2019
Publisher: American Chemical Society (ACS)
Date: 20-12-2019
DOI: 10.1021/JACS.8B11483
Abstract: We report the synthesis of centimeter sized ultrathin GaN and InN. The synthesis relies on the ammonolysis of liquid metal derived two-dimensional (2D) oxide sheets that were squeeze-transferred onto desired substrates. Wurtzite GaN nanosheets featured typical thicknesses of 1.3 nm, an optical bandgap of 3.5 eV and a carrier mobility of 21.5 cm
Publisher: Wiley
Date: 25-11-2022
Abstract: The need for novel antimicrobial agents in response to a growing antibiotic and antimicrobial resistance crisis is now at a breaking point. In this work, the use of 5 nm zinc oxide quantum dots (ZnO QDs), demonstrating rapid and high antimicrobial activity against Gram‐positive methicillin‐resistant Staphylococcus aureus and highly pathogenic yeast Candida auris cells under both non‐photocatalytic and photocatalytic conditions, is showcased. Results show ZnO QDs adhere and cluster around the microbial cell surfaces, and exhibit antimicrobial response toward attached cells, resulting in the cell membrane damage. With the introduction of ultraviolet‐A light, autogenous reactive oxygen species (ROS) are produced and caused further increase in cell membrane/wall disruption, in particular Gram‐negative Escherichia coli . Nanoscale Fourier transform infrared is used to further confirm the intrinsic biochemical changes that occur with the Gram‐negative cell membrane within 30 min and spectra demonstrate that biochemical alterations are achieved for the protein and carbohydrate component of the membrane, which is a common mechanism of ROS damage. Investigation of the cell membrane–material interaction and mechanism is crucial in developing and optimizing effective antimicrobial materials in combating the rise of antimicrobial resistance.
Publisher: SPIE
Date: 07-12-2013
DOI: 10.1117/12.2034067
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA00398B
Abstract: Using Ag–Ag 8 GeS 6 as a model system, a novel strategy for the formation of Ag-based Janus nanostructures is presented.
Publisher: Elsevier BV
Date: 08-2019
Publisher: American Chemical Society (ACS)
Date: 22-03-2011
DOI: 10.1021/JP110581J
Publisher: American Chemical Society (ACS)
Date: 04-04-2022
Abstract: Indium nitride (InN) has been of significant interest for creating and studying two-dimensional electron gases (2DEG). Herein we demonstrate the formation of 2DEGs in ultrathin doped and undoped 2D InN nanosheets featuring high carrier mobilities at room temperature. The synthesis is carried out via a two-step liquid metal-based printing method followed by a microwave plasma-enhanced nitridation reaction. Ultrathin InN nanosheets with a thickness of ∼2 ± 0.2 nm were isolated over large areas with lateral dimensions exceeding centimeter scale. Room temperature Hall effect measurements reveal carrier mobilities of ∼216 and ∼148 cm
Publisher: American Chemical Society (ACS)
Date: 03-11-2010
DOI: 10.1021/JP107043Z
Publisher: American Chemical Society (ACS)
Date: 07-01-2019
Publisher: Wiley
Date: 26-07-2021
Abstract: Methods for the fabrication of thin films with well controlled structure and properties are of great importance for the development of functional devices for a large range of applications. SILAR, the acronym for Successive Ionic Layer Adsorption and Reaction, is an evolution and combination of two other deposition methods, the Atomic Layer Deposition and Chemical Bath Deposition. Due to a relative simplicity and low cost, this method has gained increasing interest in the scientific community. There are, however, several aspects related to the influence of the many parameters involved, which deserve further deepening. In this review article, the basis of the method, its application to the fabrication of thin films, the importance of experimental parameters, and some recent advances in the application of oxide films are reviewed. At first the fundamental theoretical bases and experimental concepts of SILAR are discussed. Then, the fabrication of chalcogenides and metal oxides is reviewed, with special emphasis to metal oxides, trying to extract general information on the effect of experimental parameters on structural, morphological and functional properties. Finally, recent advances in the application of oxide films prepared by SILAR are described, focusing on supercapacitors, transparent electrodes, solar cells, and photoelectrochemical devices.
Publisher: American Chemical Society (ACS)
Date: 30-09-2019
Publisher: American Chemical Society (ACS)
Date: 15-12-2014
DOI: 10.1021/AM506611J
Abstract: Solution processing provides a versatile and inexpensive means to prepare functional materials with specifically designed properties. The current challenge is to mimic the structural, optical, and/or chemical properties of thin films fabricated by vacuum-based techniques using solution-based approaches. In this work we focus on ZnO to show that thin films grown using a simple, aqueous-based, chemical bath deposition (CBD) method can mimic the properties of sputtered coatings, provided that the kinetic and thermodynamic reaction parameters are carefully tuned. The role of these parameters toward growing highly oriented and dense ZnO thin films is fully elucidated through detailed microscopic and spectroscopic investigations. The prepared s les exhibit bulk-like optical properties, are intrinsic in their electronic characteristics, and possess negligible organic contaminants, especially when compared to ZnO layers deposited by sol-gel or from nanocrystal inks. The efficacy of our CBD-grown ZnO thin films is demonstrated through the effective replacement of sputtered ZnO buffer layers within high efficiency solution processed Cu2ZnSnS4xSe4(1-x) solar cells.
Publisher: Wiley
Date: 16-09-2015
Abstract: The electronic properties of thiol-functionalized 2D MoS2 nanosheets are investigated. Shifts in the valence and conduction bands and Fermi levels are observed while bandgaps remain unaffected. These findings allow the tuning of energy barriers between 2D MoS2 and other materials, which can lead to improved control over 2D MoS2 -based electronic and optical devices and catalysts.
Publisher: Wiley
Date: 17-10-2022
Abstract: Colloidal nanocrystals (NCs) hold great promise for the fabrication of thin film devices due to the ability to precisely control their properties and deposit coatings via solution‐based protocols. The role of interfaces, surface defects, and (electrical) connectivity between NCs is a major bottleneck to achieving the desired performance. Here, a novel method to infiltrate and densify nanocrystalline coatings deposited from doped ZnO Ncs is presented. Reduced porosity, enhanced connectivity, and a reduction in surface defects are observed, culminating in vastly improved electrical conductivity. Doped ZnO NCs are processed into an ink and used for thin film deposition. Bulky native ligands are then removed from the film to promote better electrical contact between neighboring NCs and render their surfaces hydrophilic. Afterward, a modified chemical bath deposition (CBD) is adopted to slowly infill the pores between the NCs with pure ZnO via a controlled heterogeneous nucleation process. The optimized CBD avoids excessive surface growth and premature sealing of the film surface, confirmed by combined spectroscopic and morphological characterizations. The resultant hybrid films demonstrate enhanced electrical properties, with conductivity increasing by two orders of magnitude after pore infiltration. These results pave the way to hybrid functional coatings with enriched interparticle communication.
Publisher: American Chemical Society (ACS)
Date: 19-08-2014
DOI: 10.1021/NN5027593
Abstract: Plasmonic metal oxide nanocrystals bridge the optoelectronic gap between semiconductors and metals. In this study, we report a facile, non-injection synthesis of ZnO nanocrystals doped with Al, Ga, or In. The reaction readily permits dopant/zinc atomic ratios of over 15%, is amenable to high precursor concentrations (0.2 M and greater), and provides high reaction yields (>90%). The resulting colloidal dispersions exhibit high transparency in the visible spectrum and a wavelength-tunable infrared absorption, which arises from a dopant-induced surface plasmon resonance. Through a detailed investigation of reaction parameters, the reaction mechanism is fully characterized and correlated to the optical properties of the synthesized nanocrystals. The distinctive optical features of these doped nanocrystals are shown to be readily harnessed within thin films that are suitable for optoelectronic applications.
Publisher: MDPI AG
Date: 14-03-2018
DOI: 10.3390/MA11030423
Publisher: Elsevier BV
Date: 05-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9RE00403C
Abstract: 4-Dimethylaminopyridine-stabilised gold nanoparticles are synthesised in a biphasic flow reactor system using organic/aqueous membrane separators and gas-permeable tubing.
Publisher: Wiley
Date: 21-08-2015
Publisher: American Chemical Society (ACS)
Date: 25-02-2022
Abstract: The development of high-performing p-type transparent conducting oxides will enable immense progress in the fabrication of optoelectronic devices including invisible electronics and all-oxide power electronics. While n-type transparent electrodes have already reached widespread industrial production, the lack of p-type counterparts with comparable transparency and conductivity has created a bottleneck for the development of next-generation optoelectronic devices. In this work, we present the fabrication of delafossite copper chromium oxide p-type transparent electrodes with outstanding optical and electrical properties. These layers were deposited using ultrasonic spray pyrolysis, a wet chemical method that is fast, simple, and scalable. Through careful screening of the deposition conditions, highly crystalline, dense, and smooth CuCrO
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR03788D
Abstract: Atomically thin layers of Bi 2 O 3 are isolated from liquid bismuth, allowing the development of ultrafast 2D-enabled UV photo-detectors.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR08388B
Abstract: Large-scale synthesis of O-deficient Cu 2 O with outstanding visible photoactivity is shown.
Publisher: American Chemical Society (ACS)
Date: 16-11-2022
DOI: 10.26434/CHEMRXIV-2022-776CB
Abstract: Herein we report the synthesis and characterization of spinel copper gallate (CuGa2O4) nanocrystals (NCs) with an average size of 3.7 nm via a heat-up colloidal reaction. CuGa2O4 NCs have a band gap of ~2.5 eV and a strong p-type character, in agreement with ab initio simulations. These NCs are demonstrated to be photoactive, generating a reproducible photocurrent under blue light irradiation when deposited as a thin film. The ability to adjust the Cu:Ga ratio within the NCs, and its effect on the optical and electronic properties of the NCs was also demonstrated.
Publisher: SPIE
Date: 30-04-2010
DOI: 10.1117/12.854544
Publisher: Wiley
Date: 08-05-2023
Abstract: We report a new composite material consisting of silver nanoparticles decorated with three‐dimensional molecular organic cages based on light‐absorbing porphyrins. The porphyrin cages serve to both stabilize the particles and allow diffusion and trapping of small molecules close to the metallic surface. Combining these two photoactive components results in a Fano‐resonant interaction between the porphyrin Soret band and the nanoparticle‐localised surface‐plasmon resonance. Time‐resolved spectroscopy revealed the silver nanoparticles transfer up to 37 % of their excited‐state energy to the stabilising layer of porphyrin cages. These unusual photophysics cause a 2‐fold current increase in photoelectrochemical water‐splitting measurements. The composite structure provides a compelling proof of concept for advanced photosensitiser systems with intrinsic porosity for photocatalytic and sensing applications.
Publisher: Elsevier BV
Date: 2010
Publisher: American Chemical Society (ACS)
Date: 17-11-2022
DOI: 10.26434/CHEMRXIV-2022-776CB-V3
Abstract: Herein we report the synthesis and characterization of spinel copper gallate (CuGa2O4) nanocrystals (NCs) with an average size of 3.7 nm via a heat-up colloidal reaction. CuGa2O4 NCs have a band gap of ~2.5 eV and strong p-type character, in agreement with ab initio simulations. These novel NCs are demonstrated to be photoactive, generating a clear and reproducible photocurrent under blue light irradiation when deposited as thin films. Crucially, the ability to adjust the Cu:Ga ratio within the NCs, and its effect on the optical and electronic properties of the NCs was also demonstrated. These results position CuGa2O4 NCs as a novel material for optoelectronic applications, including hole transport and light harvesting.
Publisher: American Chemical Society (ACS)
Date: 24-10-2023
Publisher: Springer Science and Business Media LLC
Date: 2012
DOI: 10.1557/OPL.2012.765
Abstract: The favorable lattice matching between Au and NiO crystals made possible the growth of unique cookie-like nanoparticles (25 nm mean diameter) inside a porous SiO 2 film after annealing at 700 °C. The unusual aggregates result from the coupling of well distinguishable Au and NiO hemispheres, which respectively face each other through the (100) and (200) lattice planes. The thermal evolution of the Au and NiO nanoparticles structure has been studied by high resolution transmission electron microscopy and UV-visible absorption spectroscopy and correlated with the evolution of the Au surface plasmon resonance peak.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC03314F
Abstract: Transparent and conducting FTO coatings are fabricated via ultrasonic spray pyrolysis achieving exceptional optical, electrical and mechanical properties.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TC01937F
Abstract: Liquid metal chemistry offers a new pathway towards the creation of functional 2D metal oxysulfides.
Publisher: American Chemical Society (ACS)
Date: 06-11-2015
Abstract: The ability to control chemical reactions using ultrafast light exposure has the potential to dramatically advance materials and their processing toward device integration. In this study, we show how intense pulsed light (IPL) can be used to trigger and modulate the chemical transformations of printed copper oxide features into metallic copper. By varying the energy of the IPL, CuO films deposited from nanocrystal inks can be reduced to metallic Cu via a Cu2O intermediate using single light flashes of 2 ms duration. Moreover, the morphological transformation from isolated Cu nanoparticles to fully sintered Cu films can also be controlled by selecting the appropriate light intensity. The control over such transformations enables for the fabrication of sintered Cu electrodes that show excellent electrical and mechanical properties, good environmental stability, and applications in a variety of flexible devices.
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Publisher: AIP Publishing
Date: 25-06-2012
DOI: 10.1063/1.4730953
Abstract: We demonstrate that the force output and work density of polydimethylsiloxane (PDMS) based dielectric elastomer transducers can be significantly enhanced by the addition of high permittivity titanium dioxide nanoparticles. The nanocomposites are capable of maintaining the actuation strain performance of the pure PDMS at relatively low electric fields while increasing the force output and work density due to mechanical reinforcement. A model relating the Maxwell stress to the measured force from the actuator was used to determine the dielectric permittivity at high electric fields thus providing results that can be directly correlated to device performance. This approach toward higher work density materials should enable smaller, lighter, and less intrusive actuator systems ideal for biomedical and robotic devices in particular.
Publisher: Elsevier BV
Date: 03-2018
Publisher: Wiley
Date: 05-08-2020
Publisher: American Chemical Society (ACS)
Date: 06-03-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3MA00364G
Abstract: New and bespoke precursors have been used to fabricate mixed anatase-rutile TiO 2 with exceptional photoelectrochemical performance towards water splitting.
Publisher: American Chemical Society (ACS)
Date: 28-03-2023
Publisher: AIP Publishing
Date: 10-2019
DOI: 10.1063/1.5113650
Abstract: Spatial frequency filtering is a fundamental enabler of information processing methods in biological and technical imaging. Most filtering methods, however, require either bulky and expensive optical equipment or some degree of computational processing. Here, we experimentally demonstrate real-time, on-chip, all-optical spatial frequency filtering using a thin-film perfect absorber structure. We experimentally demonstrate edge enhancement of an litude image and conversion of phase gradients to intensity modulation in an image. The device is used to demonstrate enhancement of an image of pond algae.
Publisher: American Chemical Society (ACS)
Date: 07-09-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR31443F
Abstract: Metal (Au, Pt, Au@Pt) and metal oxide (TiO(2)) nanoparticles are synthesized with colloidal techniques and subsequently used as nanocrystal inks for thin films deposition. The optical properties of Au colloids are strongly influenced by both Pt and TiO(2) interfaces: while platinum causes a d ing and a blue-shift of the Au Surface Plasmon Resonance (SPR) peak as a consequence of the metal-metal interaction, the anatase matrix is responsible for the red shift of the plasmon frequency due to the increased refractive index. By a careful tailoring of the nanoparticles synthesis, high quality, scattering-free films composed of an anatase matrix embedding Au, Pt and Au@Pt colloids are deposited at room temperature and stabilized at 200 °C. Room temperature exposure of these films to hydrogen leads to optical changes. In the case of Au, there is a slow blue shift of the surface plasmon band, resulting in a wavelength dependent optical response. Much faster but smaller optical changes occur for titania films containing Pt. When both metals are present, the optical response of the gold is much faster. This is attributed to spillover of hydrogen atoms from platinum to gold. This synergy enables enhanced optical sensing of hydrogen at room temperature by combining the low temperature dissociation of H(2) on Pt with the intensive surface plasmon response of the gold nanocrystals.
Publisher: Springer Science and Business Media LLC
Date: 24-01-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM12537K
Publisher: MDPI AG
Date: 13-07-2015
DOI: 10.3390/S150716910
Publisher: Elsevier BV
Date: 12-2011
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Publisher: American Chemical Society (ACS)
Date: 26-04-2019
Abstract: Here we present a robust molecular precursor-based approach to synthesize high-quality thin films of silver bismuth sulfide (AgBiS
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR08830F
Abstract: Indium doping in ZnS nanocrystals heavily affects the band gap beyond quantum confinement effect with unprecedented tunability in the UVA/UVB range.
Publisher: Wiley
Date: 27-09-2021
Abstract: Chalcohalide semiconductors are an emergent class of materials for optoelectronics. Here, the first work on BiSI chalcohalide thin film photodetectors (PDs) is presented. An entirely new method for the fabrication of bismuth chalcohalide thin films (BiOI and BiSI) is developed. This method circumvents the use of any ligands or counter ions during fabrication and provides highly pure thin films free of carbon residues and other contaminants. When integrated into lithographically patterned lateral PDs these BiSI thin films show outstanding performances and high stability. The direct ≈1.55 eV bandgap of BiSI perfectly accommodates optical sensing over the full visible spectrum. The responsivity ( R ) of the BiSI PDs reaches 62.1 A W −1 , which is the best value reported to date across chalcohalide materials of any type. The BiSI PDs display remarkable sensitivity to low light levels, supporting a broad operational detectivity ≈10 12 Jones over four decades in light intensity, with a peak specific detectivity (D*) of 2.01 × 10 13 Jones. The dynamics of photocurrent generation are demonstrated to be dominated by photoconductive gain. These results cement BiSI as an exciting candidate for high performance photodetector applications and encourage ongoing work in BiSX (X = Cl, Br, I) materials for optoelectronics.
Publisher: American Chemical Society (ACS)
Date: 21-02-2013
DOI: 10.1021/JA307960Z
Abstract: We present a new colloidal synthesis of gallium-doped zinc oxide nanocrystals that are transparent in the visible and absorb in the near-infrared. Thermal decomposition of zinc stearate and gallium nitrate after hot injection of the precursors in a mixture of organic amines leads to nanocrystals with tunable properties according to gallium amount. Substitutional Ga(3+) ions trigger a plasmonic resonance in the infrared region resulting from an increase in the free electrons concentration. These nanocrystals can be deposited by spin coating, drop casting, and spray coating resulting in homogeneous and high-quality thin films. The optical transmission of the Ga-ZnO nanoparticle assemblies in the visible is greater than 90%, and at the same time, the near-infrared absorption of the nanocrystals is maintained in the films as well. Several strategies to improve the films electrical and optical properties have been presented, such as UV treatments to remove the organic compounds responsible for the observed interparticle resistance and reducing atmosphere treatments on both colloidal solutions and thin films to increase the free carriers concentration, enhancing electrical conductivity and infrared absorption. The electrical resistance of the nanoparticle assemblies is about 30 kΩ/sq for the as-deposited, UV-exposed films, and it drops down to 300 Ω/sq after annealing in forming gas at 450 °C, comparable with state of the art tin-doped indium oxide coatings deposited from nanocrystal inks.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA07710D
Abstract: Bismuth vanadate coatings are fabricated via a sequential solution-based method and used as photoanodes for water oxidation achieving exceptional performances.
Publisher: Elsevier BV
Date: 08-2020
Location: United States of America
Start Date: 07-2022
End Date: 07-2025
Amount: $413,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 12-2020
Amount: $339,429.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2021
End Date: 07-2023
Amount: $269,020.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2019
End Date: 09-2024
Amount: $320,000.00
Funder: Australian Research Council
View Funded Activity