A5068578601- GaN-based semiconductor devices and materials
- Radiation Effects in Electronics
- Radiation Detection and Scintillator Technologies
- Topological Materials and Phenomena
- Geological and Geochemical Analysis
- Acoustic Wave Resonator Technologies
- Nuclear Physics and Applications
- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Lubricants and Their Additives
- Ferroelectric and Piezoelectric Materials
- Particle Detector Development and Performance
- Microstructure and Mechanical Properties of Steels
- Integrated Circuits and Semiconductor Failure Analysis
- Metallic Glasses and Amorphous Alloys
- Advanced Thermoelectric Materials and Devices
- Tribology and Wear Analysis
- Advanced materials and composites
- Radiation Therapy and Dosimetry
- Graphene research and applications
- Ga2O3 and related materials
- Semiconductor materials and devices
- Advanced Condensed Matter Physics
- Photorefractive and Nonlinear Optics
- Thermal Expansion and Ionic Conductivity
University of Wollongong
2015-2023
ARC Centre of Excellence in Future Low-Energy Electronics Technologies
2020-2022
Australian Nuclear Science and Technology Organisation
2020-2022
Monash University
2022
Queensland University of Technology
2020
Electrical communication between a biological system and outside equipment allows one to monitor influence the state of tissue nervous networks. As bridge, bioelectrodes should possess both electrical conductivity adaptive mechanical properties matching target soft biosystem, but this is still big challenge. A family liquid-metal-based magnetoactive slurries (LMMSs) formed by dispersing magnetic iron particles in Ga-based liquid metal (LM) matrix reported here. The properties, viscosity,...
Biochar amendments add persistent organic carbon to soil and can stabilize rhizodeposits existing (SOC), but effects of biochar on subsoil stocks have been overlooked. We quantified changes in inorganic (SIC) SOC 2 m depth 10 years after application calcareous soil. The total (i.e., SOC, SIC, biochar-C) increased by 71, 182, 210% for B30, B60, B90, respectively. at 30, 60, 90 t ha-1 rates significantly SIC 10, 38, 68 ha-1, respectively, with accumulation mainly occurring the (below 1 m)....
Abstract Herein we investigate a (001)-oriented GaAs 1− x Bi /GaAs structure possessing surface droplets capable of catalysing the formation nanostructures during Bi-rich growth, through vapour-liquid-solid mechanism. Specifically, self-aligned “nanotracks” are found to exist trailing on sample surface. Through cross-sectional high-resolution transmission electron microscopy nanotracks revealed in fact be elevated above by subsurface planar nanowire, initiated mid-way molecular-beam-epitaxy...
Microdosimetry is an extremely useful technique, used for dosimetry in unknown mixed radiation fields typical of space and aviation, as well hadron therapy. A new silicon microdosimeter with 3D sensitive volumes has been proposed to overcome the shortcomings conventional Tissue Equivalent Proportional Counter. In this article, charge collection characteristics a mesa were investigated using ANSTO heavy ion microprobe utilizing 5.5 MeV He <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract To exploit the improved efficiency from formulated oil modified with graphite nanoplates (GNP), it is important to understand how GNP behave alongside conventional additives such as zinc dialkyl dithiophosphates (ZDDP). The results in this work demonstrate unusual tribological responses of engine due additions, which cannot be explained by traditionally low shearing mechanism between graphene layers GNP. A competitive and synergistic effect on tribofilm formation proposed for...
New 10- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> -thick silicon microdosimeters utilizing 3-D technology have been developed and investigated in this paper. The TCAD simulations were carried out to understand the electrical properties of microdosimeters' design. A charge collection study devices was performed using 5.5-MeV He <sup...
The extreme state of high friction, severe wear, and oxidation invariably occur in mechanical contacts during temperature steel processing. application lubricant to mitigate the aforementioned hindrances can enhance process performance effectively. Melt lubricants are regarded as a highly promising class due their good thermal stability unique physical chemistry. present study evaluates tribological responses an alkaline metal borate on tribo-pair at 800 °C by ball-on-disk testing. It has...
The conducting boundary states of topological insulators appear at an interface where the characteristic invariant ℤ2 switches from 1 to 0. These offer prospects for quantum electronics; however, a method is needed spatially-control pattern channels. It shown that modifying Sb2Te3 single-crystal surfaces with ion beam insulator into amorphous state exhibiting negligible bulk and surface conductivity. This attributed transition = → 0 threshold disorder strength. observation supported by...
This study applies the recently developed transmission Kikuchi diffraction technique to investigate microstructures and micro‐textures of a multi‐phase Fe–17Mn–3Al–2Si–1Ni–0.08C wt% steel that concurrently exhibits twinning‐ transformation‐induced plasticity effects. The was cold rolled 66% thickness reduction subsequently annealed at 625 °C for 300 s. cold‐rolled microstructure mainly consisted α′ martensite interspersed with blocky ϵ remanent nanometer‐sized grains γ. Annealing led partial...
Magnesium-based thermoelectric materials (Mg2X, X = Si, Ge, Sn) have received considerable attention due to their availability, low toxicity, and reasonably good performance. The synthesis of these with high purity is challenging, however, the reactive nature vapour pressure magnesium. In current study, single phase n-type Mg2Ge has been fabricated through a one-step reaction MgH2 elemental using spark plasma sintering (SPS) reduce formation magnesium oxides liberation hydrogen. We found...
Abstract Molybdenum carbides are promising low‐cost electrocatalysts for electrolyzers, fuel cells, and batteries. However, synthesis of ultrafine, phase‐pure carbide nanoparticles ( diameter < 5 nm) with large surface areas remains challenging due to uncontrollable agglomeration that occurs during traditional high temperature syntheses. This work presents a scalable, physical approach synthesize molybdenum at room by ion implantation. By tuning the implantation conditions, various...
We present a novel framework for the fabrication of geometrically complex structures at micro- and nano-scale which relies on synergy integrated computer-aided design manufacturing systems (CAD/CAM) focused ion beam (FIB) technology in scanning electron microscope. Here we utilise industry standard G-code syntax, first time, to FIB machining by designing geometries with CAD, defining strategies exporting G-codes CAM generating coordinate list-based path using custom-built interpreter...
The response of a 5- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> -thin silicon on insulator (SOI) 3-D microdosimeter was investigated for single-event upset applications by measuring the linear energy transfer (LET) different high LET ions. charge collection characteristics device were performed using ion beam-induced (IBIC) technique with 3- and 5.5-MeV He...
ABSTRACT A simple procedure, which enables accurate measurement of transmission electron microscopy (TEM)/STEM probe currents using an energy loss spectrometer drift tube is described. The obtained are compared with those measured on the fluorescent screen to enable losses due secondary and backscattered electrons be determined. current values from allow correction densities yield true current. They also CCD conversion efficiencies obtained, in turn allows images calibrated terms fluence....
Abstract Aluminum nitride (AlN) is a material for wide range of microwave‐frequency electronics devices, because its piezoelectric properties and high chemical stability. To improve the performance AlN‐based such as acoustic wave filters energy harvesters, an increased modulus desirable. Here, increase d 33 this achieved by ion implantation noble gases. For fluence 3 × 10 16 at cm −2 Ar + , 30% AlN obtained. The improvement attributed to gas atoms implanted into interstitial sites wurtzite...
Topological insulators (TIs) are emergent materials with unique band structure, which allow the study of quantum effect in solids, as well contribute to high-performance devices. To achieve better performance TIs, here, we present a codoping strategy using synergistic rare-earth (RE) Sm and transition-metal Fe dopants ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ single crystals, combine advantages both transition-metal-doped TI [high ferromagnetic ordering temperature observed anomalous Hall...
The surfaces of Sb2Te3 topological insulator crystals were implanted using a 40 keV chromium ion beam. To facilitate uniform doping, the was passivated with thin TiO2 film before implantation step. resulting chemical structure studied atomic-resolution transmission electron microscopy. A fluence 7 × 1015 ions/cm2 at lead to amorphization surface, predominantly incorporated in amorphous layer. Heating 200 °C caused region recrystallize and led formation chromium-rich interfacial Near-edge...
Zircon geochemistry can vary over micrometre scales; therefore, natural reference materials need to be well characterised before being used calculate trace element mass fractions in unmeasured samples. Moreover, material homogeneity needs ensured with the accelerating rate of geoanalytical developments map mineral chemistry at increasingly finer scales. Here, we investigate zoning four widely zircon materials: 91500, Mud Tank, Temora and Plešovice, as crystals from Mount Dromedary/Gulaga...
The amount and distribution of water in nominally anhydrous minerals (NAMs) are usually determined by Fourier-transform infrared spectroscopy. This method is limited the spot size beam to study samples with dimensions greater than a few micrometers. Here, we demonstrate potential using photoinduced force microscopy for measurement NAMs sizes down nanometer scale concentration across grain boundaries forsterite. development will enable speciation diffusion small-grained rock matrixes allow...