ORCID Profile
0000-0002-0500-3599
Current Organisations
University of Technology Sydney
,
University of Technology Sydney Faculty of Science
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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)
Materials Engineering Not Elsewhere Classified | Electrical and Electronic Engineering not elsewhere classified | Other Electronic Engineering | Condensed Matter Physics | Interdisciplinary Engineering Not Elsewhere Classified | Materials Engineering | Electrical Engineering | Electrical and Electronic Engineering | Biomedical Engineering not elsewhere classified | Condensed Matter Physics—Electronic And Magnetic Properties; | Condensed Matter Characterisation Technique Development |
ANZSRC Socio-Economic Objective (SEO)
Ceramics | Other | Electricity transmission | Metals (composites, coatings, bonding, etc.) | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Integrated systems | Scientific instrumentation
Related Links
Publications
Generation of high-power terahertz pulses in a prism
Publisher: Optica Publishing Group
Date: 11-2002
DOI: 10.1364/OL.27.001935
Abstract: A compact, high-power emitter of half-cycle terahertz (THz) radiation is demonstrated. The device consists of an epitaxial InAs emitter upon a GaAs prism and produces THz pulses that are 20 times more powerful than those from conventional planar InAs emitters. This improvement is a direct result of reorienting the transient THz dipole such that its axis is not perpendicular to the emitting surface.
Enhancement of THz emission from semiconductor devices
Publisher: IEEE
Date: 2002
Nonlinear Optical Properties Of Semiconducting Nanocrystals In Fused Silica
Publisher: Elsevier BV
Date: 1999
The aluminium-copper-gold ternary system
Publisher: Springer Science and Business Media LLC
Date: 09-2009
DOI: 10.1007/BF03214935
Nonlinear Optical Response Of Ge Nanocrystals In A Silica Matrix
Publisher: AIP Publishing
Date: 11-01-1999
DOI: 10.1063/1.123267
Abstract: Time-resolved degenerate-four-wave-mixing measurements were used to study the nonlinear optical response (intensity-dependent refractive index) of Ge nanocrystallites embedded in a silica matrix. Nanocrystals were fabricated by ion-implanting silica with 1.0 MeV Ge ions to fluences in the range from 0.6 to 3×1017 Ge cm−2, followed by annealing at 1100 °C for 60 min. For the highest fluence, this resulted in nanocrystals with a log-normal size distribution, having a geometric mean diameter of 3.0 nm and a dimensionless geometric standard deviation of 0.25. The intensity-dependent refractive index |n2| was measured at a wavelength of 800 nm and found to increase linearly with increasing Ge fluence. For the highest fluence, |n2| was determined to be in the range 2.7–6.9×10−13 cm−2 W−1, depending on the duration of the excitation pulse values were consistently smaller for shorter pulse lengths. Relaxation of the nonlinear response was found to have two characteristic time constants, one & fs and the other ∼1 ps.
On the formation of nanocrystalline active zinc oxide from zinc hydroxide carbonate
Publisher: Springer Science and Business Media LLC
Date: 16-03-2014
Seed‐Induced Growth of Flower‐Like Au–Ni–ZnO Metal–Semiconductor Hybrid Nanocrystals for Photocatalytic Applications
Publisher: Wiley
Date: 30-10-2014
Abstract: The combination of metal and semiconductor components in nanoscale to form a hybrid nanocrystal provides an important approach for achieving advanced functional materials with special optical, magnetic and photocatalytic functionalities. Here, a facile solution method is reported for the synthesis of Au-Ni-ZnO metal-semiconductor hybrid nanocrystals with a flower-like morphology and multifunctional properties. This synthetic strategy uses noble and magnetic metal Au@Ni nanocrystal seeds formed in situ to induce the heteroepitaxial growth of semiconducting ZnO nanopyramids onto the surface of metal cores. Evidence of epitaxial growth of ZnO{0001} facets on Ni {111} facets is observed on the heterojunction, even though there is a large lattice mismatch between the semiconducting and magnetic components. Adjustment of the amount of Au and Ni precursors can control the size and composition of the metal core, and consequently modify the surface plasmon resonance (SPR) and magnetic properties. Room-temperature superparamagnetic properties can be achieved by tuning the size of Ni core. The as-prepared Au-Ni-ZnO nanocrystals are strongly photocatalytic and can be separated and re-cycled by virtue of their magnetic properties. The simultaneous combination of plasmonic, semiconducting and magnetic components within a single hybrid nanocrystal furnishes it multifunctionalities that may find wide potential applications.
The Size Distribution of Ge Nanocrystals in Implanted and Annealed Silica
Publisher: Springer Science and Business Media LLC
Date: 2000
Abstract: This study examines the effect of implantation and annealing parameters on the formation of Ge crystallites in ion-implanted silica. S les were implanted at room temperature or −196 o C with 1.0 MeV Ge + ions to fluences in the range from 0.6 to 3×10 17 Ge.cm −2 . Ge nanocrystals were not observed in s les implanted at −196°C but were observed in s les irradiated at room temperature. Nanocrystals were observed in all s les after annealing and their size distribution was found to be almost independent of the implant fluence. The distributions were also shown to be asymmetrical with depth, with smaller nanocrystals located on the near-surface side of the implant distribution.
Tuning plasma frequency for improved solar control glazing using mesoporous nanostructures
Publisher: SPIE
Date: 21-04-2006
DOI: 10.1117/12.661198
Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA22450D
Abstract: Large more reproducibly fabricated microstructures can also provide significant Raman signal enhancement via usually neglected multipolar plasmon resonances.
Core-shell nanoparticles with self-regulating plasmonic functionality
Publisher: American Physical Society (APS)
Date: 26-03-2007
Linear optical properties of Ge nanocrystals in silica
Publisher: AIP Publishing
Date: 08-10-2001
DOI: 10.1063/1.1409591
Abstract: The absorption and extinction spectra of Ge nanocrystals in silica formed by ion implantation are studied using photothermal deflection and transmission spectroscopies. It is found that scattering makes a significant contribution to the extinction spectrum, d ing the spectral features and resulting in a Rayleigh scattering-like ω4 dependence. In contrast, the spectra measured by photothermal deflection clearly show features such as the E1/E1+Δ1 transitions. The Tauc gap is extracted to be ∼0.7±0.1 eV.
The synthesis of hydroxyapatite from artificially grown Red Sea hydrozoan coral for antimicrobacterial drug delivery system applications
Publisher: Springer Science and Business Media LLC
Date: 05-01-2021
Magnetic-field-induced enhancement of terahertz emission from III–V semiconductor surfaces
Publisher: Elsevier BV
Date: 04-2022
Zinc hydroxyacetate and its transformation to nanocrystalline zinc oxide
Publisher: American Chemical Society (ACS)
Date: 18-12-2013
DOI: 10.1021/IC302328E
Abstract: The synthesis of nanocrystalline ZnO by thermal decomposition of zinc hydroxyacetate, Zn(5)(OH)(8)(CH(3)CO(2))(2)·nH(2)O, was investigated. The decomposition process was examined using X-ray diffraction, thermogravimetric analysis, mass spectrometry, electron microscopy, Brunauer-Emmett-Teller surface area analysis, and solid-state NMR spectroscopy. Intermediate Zn(5)(OH)(8)(CH(3)CO(2))(2)·nH(2)O phases form at temperatures up to 110 °C from the starting compound Zn(5)(OH)(8)(CH(3)CO(2))(2)·2H(2)O by partial dehydration. At ∼110 °C, 4 equiv of ZnO and 1 equiv of Zn(CH(3)CO(2))(2) are formed. Further heating causes Zn(CH(3)CO(2))(2) to decompose to acetone, acetic acid, acetic anhydride, and ZnO. Notably, a portion of Zn(CH(3)CO(2))(2) sublimes during the process. Overall, the product of the calcination is equiaxed ZnO nanocrystals of 20-100 nm diameter.
The preparation of a plasmonically resonant VO2thermochromic pigment
Publisher: IOP Publishing
Date: 03-02-2009
DOI: 10.1088/0957-4484/20/8/085607
Abstract: Vanadium dioxide (VO(2)) undergoes a reversible metal-insulator transition, normally at approximately 68 degrees C. While the properties of continuous semi-transparent coatings of VO(2) are well known, there is far less information available concerning the potential use of discrete VO(2) nanoparticles as a thermochromic pigment in opaque coatings. In idual VO(2) nanoparticles undergo a localized plasmon resonance with near-infrared light at about 1100 nm and this resonance can be switched on and off by simply varying the temperature of the system. Therefore, incorporation of VO(2) nanoparticles into a coating system imbues the coating with the ability to self-adaptively modulate its own absorptive efficiency in the near-infrared. Here we examine the magnitude and control of this phenomenon. Prototype coatings are described, made using VO(2) powder produced by an improved process. The materials are characterized using calorimetry, x-ray diffraction, high-resolution scanning electron microscopy, transmission electron microscopy, and by measurement of optical properties.
Thermosalience Revealed on the Atomic Scale: Rapid Synchrotron Techniques Uncover Molecular Motion Preceding Crystal Jumping
Publisher: American Chemical Society (ACS)
Date: 17-02-2022
Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis
Publisher: Elsevier BV
Date: 08-2015
Magnetic metal phosphide nanorods as effective hydrogen-evolution electrocatalysts
Publisher: Elsevier BV
Date: 11-2014
Thin films of AuCuAl shape memory alloy for use in plasmonic nano-actuators
Publisher: Springer Science and Business Media LLC
Date: 2011
DOI: 10.1557/OPL.2011.180
Abstract: We describe the fabrication and structure of nanoscale thin films of β phase shape memory alloys with the nominal atomic stoichiometry Au 7 Cu 5 Al 4 (corresponding to 5.8 wt% Al). These alloys possess properties that suggest they could be used in nanoscale actuators. The films described here are between 20 and 50 nm thick which is below the thickness at which some other shape memory alloys cease to transform. However, microstructural and X-ray studies confirm that the coatings still exhibit the displacive transformations that are a prerequisite for the shape memory effect.
Design, Construction and Calibration of an Instrument for Measuring the Production of Chilled Water by the Combined Effects of Evaporation and Night Sky Radiation
Publisher: American Society of Mechanical Engineers
Date: 09-11-2012
Abstract: This paper presents the design and mathematical modeling of thermal radiator panels to be used primarily to measure night sky radiation from dry and wet coated surfaces. Three panels may be used in conjunction as a combined measuring system. One panel consists of an upper dry surface coated aluminum sheet laminated to an ethylene vinyl acetate foam backing block having a pattern of parallel flow water channels and header channels milled into its mating surface prior to lamination to the aluminum sheet. This configuration provides a fin and channel radiator instrument whereby circulating water may be used to measure the heat loss from this panel to night sky radiation. In a second configuration, the surface of a panel without buried water channels but otherwise identical may be wetted in order to study and compare the night sky radiation from its wet surface. In this case, the measuring water is circulated over the upper face of this panel. In a third configuration, water is sprayed onto the surface of the second panel (or a similar panel) so that an evaporative cooling effect is gained in addition to the radiation effect. Initial TRNSYS simulations for the performance of all three configurations are presented and it is planned to use the panels as calibrated instruments for discriminating between the cooling effects of night sky radiation and evaporation.
Enhancement of THz emission from semiconductor surfaces
Publisher: IEEE
Date: 2002
Optical readout of the intracellular environment using nanoparticle transducers.
Publisher: Elsevier BV
Date: 11-2014
DOI: 10.1016/J.TIBTECH.2014.09.004
Abstract: There is rapid growth in the use of multi-functional nanoparticles as transducers to probe the intracellular environment. New designs of nanoparticles can provide quantitative information at sub-cellular resolution on parameters such as pH, temperature and concentration of nicotinamide adenine dinucleotide (NADH) or selected metal ions. This new work builds on the existing practice of using nanoparticles and fluorescent dyes to provide enhanced microscopic images of cells, but goes beyond it by adding new functionalities and analytical capabilities. In this review, we discuss the recent literature on the development of such nanoparticles for simultaneous biosensing and imaging. We explore and examine the different measurements that will be possible, and analyze the likely accuracy and resolution that could be achieved.
Plasmon resonances on opto-capacitive nanostructures
Publisher: SPIE
Date: 22-12-2015
DOI: 10.1117/12.2202282
Emission of collimated THz pulses from photo-excited semiconductors
Publisher: IOP Publishing
Date: 15-03-2004
Terahertz Spectroscopic Analysis of Peptides and Proteins
Publisher: Springer Science and Business Media LLC
Date: 26-06-2012
Thermal stability of mesoscopic compounds of cetyltrimethylammonium and Keggin metatungstates
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7DT02073B
Abstract: A hybrid surfactant olyoxometalate compound was synthesized by combining isopolytungstate anions with the cationic surfactant cetyltrimethylammonium bromide (CTA-Br) to produce a hierarchical compound that we identify as (CTA) 7 [H 2 W 12 O 40 ]Cl·2H 2 O.
Thermal Stability of (KxNayH1-x-y)2Ti6O13 Nanofibers
Publisher: Wiley
Date: 21-10-2011
Photocurrent autocorrelation of femtosecond laser pulses in poly(p-phenylenevinylene)
Publisher: IOP Publishing
Date: 07-03-1997
On The Coalescence Of Nanoparticulate Gold Sinter Ink
Publisher: American Chemical Society (ACS)
Date: 17-05-2013
DOI: 10.1021/JP401815B
Electrochemical energy storage on nanoporous copper sponge
Publisher: Springer Science and Business Media LLC
Date: 14-03-2022
DOI: 10.1557/S43578-022-00535-Z
Abstract: A proof-of-principle double-layer symmetrical supercapacitor with nanoporous copper/copper oxide electrodes and an aqueous electrolyte is investigated. The electrodes are manufactured by selective dissolution of Al from a eutectic composition of Cu 17.5 Al 82.5 using 5 M NaOH. The ostensible (i.e., net external) capacitance of a symmetrical two-electrode cell with 0.1 M KNO 3 electrolyte is assessed over a series of charge/discharge cycles and is about 2 F per gram of Cu in this simple prototype. Capacitance varies during a discharge cycle due evidently to the deeply buried surfaces and pseudocapacitive reactions contributing charge toward the end of a discharge cycle. In principle such a device should have very low ohmic losses due to its highly conductive backbone and would be suitable for applications requiring maximum energy efficiency over repeated cycling. The aqueous electrolyte ensures fire safety but this comes at the cost of lower energy content. Graphical abstract
Effect of Precursor Stoichiometry on the Morphology of Nanoporous Platinum Sponges
Publisher: American Chemical Society (ACS)
Date: 03-06-2014
DOI: 10.1021/AM501794Y
Abstract: Nanoscale sponges formed by de-alloying suitable metallic alloys have a wide variety of potential applications due to their enhanced catalytic, optical, and electrochemical properties. In general, these materials have a bi-continuous, vermicular morphology of pores and ligaments with a fibrous appearance however, other morphologies are sometimes reported. Here, we investigate how stoichiometry and process parameters control the characteristics of sponges formed from thin film precursors of AlxPt. Materials deposited at elevated temperatures and with mole fraction of Al between 0.65 and 0.90 produce the classic isotropic fibrous sponges with a morphology that varies systematically with precursor stoichiometry however, de-alloying of material deposited at room temperature produced unusual isotropic foamy sponges. The evidence suggests that formation of a conventional fibrous sponge requires an equilibrated precursor whereas foamy morphologies will result if the precursor is metastable. Modeling was used to investigate the range of possible morphologies. As stoichiometry changed in the model system, the average mean and Gaussian curvature of the sponges systematically changed, too. The evolution of these shapes passed through certain special morphologies for ex le, modelled structures with 0.80 Al had a zero average Gaussian curvature and might represent a structural optimum for some applications. These observations provide a means to control sponge morphology at the nanoscale.
Epitaxial superlattices with titanium nitride as a plasmonic component for optical hyperbolic metamaterials
Publisher: Proceedings of the National Academy of Sciences
Date: 12-05-2014
Abstract: Plasmonic and metamaterial devices require high-performance material building blocks, both plasmonic and dielectric, to be useful in any real-world application. Here, we develop both plasmonic and dielectric materials that can be grown epitaxially into ultrathin and ultrasmooth layers with sharp interfaces. We show that a superlattice consisting of titanium nitride as a plasmonic component behaves as an optical hyperbolic metamaterial and exhibits extremely high photonic density of states.
Cathodoluminescence as a method of extracting detailed information from nanophotonics systems: A study of silicon nanocrystals
Publisher: SPIE
Date: 28-12-2006
DOI: 10.1117/12.638662
Non-linear optical response of metallic and semiconducting nanocrystals in fused silica
Publisher: Springer Science and Business Media LLC
Date: 1996
DOI: 10.1557/PROC-438-423
Abstract: The linear and nonlinear optical properties of Ge-implanted fused-silica were examined and compared with Au- and Si-implanted s les. S les as-implanted with 1.0 MeV Ge ions to a fluence of 3x10 17 Ge.cm -2 exhibited relatively large non-linearities, |n 2 | ≤5x10 -12 cm 2 /W, and fast relaxation times, ∼lps. In contrast, s les implanted with comparable fluences of Au ions exhibited smaller non-linearities, |n 2 | ∼1x10 -13 cm 2 /W, and slower response times, ≥ 10ps. The non-linearity for Ge was much larger than that for s les as-implanted with Si.
Electronic structure of potassium-doped La@ C82 metallofullerene studied with photoelectron spectroscopy
Publisher: American Physical Society (APS)
Date: 24-10-2007
Physical and optical characterisation of Ge-implanted silica
Publisher: Elsevier BV
Date: 04-2001
Multimode plasmon resonances on double- and triple-decker stacks of silver nanotriangles
Publisher: IEEE
Date: 02-2014
Remarkable thermal stability of gold nanoparticles functionalised with ruthenium phthalocyanine complexes
Publisher: IOP Publishing
Date: 18-04-2016
DOI: 10.1088/0957-4484/27/21/215702
Abstract: A gold nanoparticle (AuNP) ruthenium phthalocyanine (RuPc) nanocomposite has been synthesised that exhibits high thermal stability. Electrical resistance measurements revealed that the nanocomposite is stable up to ∼320 °C. Examination of the nanocomposite and the RuPc stabiliser complex using thermogravimetric analysis and differential scanning calorimetry show that the remarkable thermal stability is due to the RuPc molecules, which provide an effective barrier to sintering of the AuNPs.
Super-Resolution Reconstruction for Two- and Three-Dimensional LA-ICP-MS Bioimaging
Publisher: American Chemical Society (ACS)
Date: 23-10-2019
Optical properties and plasmon resonances of titanium nitride nanostructures
Publisher: IOP Publishing
Date: 22-02-2010
DOI: 10.1088/0957-4484/21/11/115201
Abstract: We examine the optical properties of nanostructures comprised of titanium nitride, TiN, an electrically conducting intermetallic-like compound. This material can be deposited in the form of durable films by physical vapor deposition. Use of nanosphere templating techniques extends the range of nanostructures that can be produced to include the versatile semi-shell motif. The dielectric properties of TiN(1-x) depend upon stoichiometry and are favorable for plasmon resonance phenomena in the mid-visible to near-infrared range of the spectrum and for x approximately 0. We analyze the optical phenomena operating in such structures using a combination of experiment and simulation and show that semi-shells of TiN exhibit a tunable localized plasmon resonance with light. The material is, however, unsuitable for applications in which a long-distance surface plasmon polariton is desired.
Learning to Pronounce Vowel Sounds in a Foreign Language using Acoustic Measurements of the Vocal Tract as Feedback in Real Time
Publisher: SAGE Publications
Date: 1998
DOI: 10.1177/002383099804100101
Abstract: An acoustic impedance spectrometer was used to measure the frequencies R1 and R2 of the first two resonances of the vocal tract. The measurement was made just outside the mouth, in parallel with the free field, using a new technique that provides precise information about the acoustic response of the vocal tract in real time. Values measured for native speakers for a particular vowel were used as target parameters for subjects who used a visual display of an impedance spectrum of their own vocal tracts as realtime feedback to realize the vocal tract configuration required to pronounce the target vowel. We report the values (R1,R2) for eleven non-nasalized vowels of French. These values are similar to the formant frequencies measured previously for these vowels, and their relative positions in the (R2,R1) plane are similar to those of the same vowels in the (F2,F1) formant plane. The confusion and correct identification of these vowels are shown to be strongly related to their separation in the (R2,R1) plane. We report the results of attempts to imitate six of these vowels by monolingual anglophone subjects. One group used a traditional method of learning pronunciation: they heard the vowel sounds and then attempted to imitate them. Another group also heard the sounds, but were assisted by the vocal tract feedback described above when imitating the target sounds. The acoustic properties and recognizability of the vowels were significantly superior when the subjects used vocal-tract feedback.
Calorimetric Sensor for Use in Hydrogen Peroxide Aqueous Solutions
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1594
Amino acid sequence controls the self-assembled superstructure morphology of N-acetylated tri-β3-peptides
Publisher: Walter de Gruyter GmbH
Date: 08-09-2015
Abstract: Peptides based on unnatural β 3 -amino acids offer a versatile platform for the design of self-assembling nanostructures due to the folding stability of the 14-helix and the high symmetry of the side chains inherent in this geometry. We have previously described that N-terminal acetylation (Ac-) forms a supramolecular self-assembly motif that allows β 3 -peptides to assemble head-to-tail into a helical nanorod which then further bundles into hierarchical superstructures. Here we investigate the effect of the topography of the 14-helical nanorod on lateral self-assembly. Specifically, we report on the variations in the superstructure of three isomeric peptides comprising the same three β 3 -amino acid residues: β 3 -leucine (L), β 3 -isoleucine (I) β 3 -alanine (A) to give peptides Ac-β 3 [LIA], Ac-β 3 [IAL] and Ac-β 3 [ALI]. AFM imaging shows markedly different superstructures for the three peptides. Well defined synchrotron far-infrared spectra reveal uniform geometries with a high degree of similarity between the isomeric peptides in the amide modes of the 400–650 wavenumber range. Far-IR also confirms that the C-terminal carboxyl group is free in the assemblies, thus it is solvated in the dispersant. Hence, the differences in the superstructures formed by the fibers are defined primarily by van der Waals energy minimization between the varied cross sectional morphologies of the core nanorods.
Structural analysis of bioinspired nano materials with synchrotron far IR spectroscopy
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CP01355D
Abstract: Synchrotron far-infrared spectroscopy was used in conjunction with density functional theory vibrational analysis to ascertain the core structure of self-assembled fibrous superstructures formed by unnatural β 3 -tripeptides.
Related Organisations
University Of Technology Sydney Faculty Of Science
Location: Australia
Related Funding Activities
Linkage Infrastructure, Equipment And Facilities - Grant ID: LE0775559
Start Date: 2007
End Date: 12-2008
Amount: $400,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0668322
Start Date: 2007
End Date: 12-2008
Amount: $147,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE170100020
Start Date: 2017
End Date: 12-2017
Amount: $200,000.00
Funder: Australian Research Council
View Funded Activity