A5022281682- Advanced Chemical Physics Studies
- Nanocluster Synthesis and Applications
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Advanced Nanomaterials in Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Catalysis and Oxidation Reactions
- Spectroscopy and Laser Applications
- Quantum Dots Synthesis And Properties
- Mass Spectrometry Techniques and Applications
- Inorganic Chemistry and Materials
- Molecular Spectroscopy and Structure
- Copper-based nanomaterials and applications
- Atmospheric Ozone and Climate
- Spectroscopy and Quantum Chemical Studies
- Nanomaterials for catalytic reactions
- Electrocatalysts for Energy Conversion
- Inorganic Fluorides and Related Compounds
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Organometallic Complex Synthesis and Catalysis
- Metal and Thin Film Mechanics
- Conducting polymers and applications
The University of Adelaide
2016-2025
CO2CRC
2007-2012
University of South Australia
2010
Flinders University
2010
Curtin University
2010
The University of Sydney
1997-2002
Nanyang Technological University
1999
University of Hyderabad
1998
University of British Columbia
1995-1997
Peninsula College
1997
The use of the coupling agent, 3-aminopropyltriethoxysilane (APTES), in silanization reaction with silanol-terminated silicon is an important surface modification reaction. Of particular importance that terminal amine functionalities APTES are sufficiently exposed to gas or liquid phase for further modifications, such as amide reactions. Here, metastable induced electron spectroscopy (MIES) and UV photoelectron (UPS) were used study composition outermost layer a Si after APTES....
Recently, the creation of new heterogeneous catalysts using unique electronic/geometric structures small metal nanoclusters (NCs) has received considerable attention. However, to achieve this, it is extremely important establish methods remove ligands from ligand-protected NCs while preventing aggregation NCs. In this study, ligand-desorption process during calcination was followed for metal-oxide-supported 2-phenylethanethiolate-protected gold (Au) 25-atom five experimental techniques. The...
Abstract Development of both organic photovoltaics (OPVs) and photocatalysts has focused on utilizing the bulk heterojunction (BHJ). The BHJ promotes charge separation enhances carrier lifetime, but may give rise to increased traps, hindering performance. Here, high photocatalytic photovoltaic performance is displayed by electron donor–acceptor (D–A) nanoparticles (NPs) films, using nonfullerene acceptor Y6 polymer donor PIDT‐T8BT. In contrast conventional D–A systems, generation in...
Synchrotron XPS was used to investigate a series of chemically-synthesised, atomically-precise gold clusters Au(n)(PPh(3))(y) (n = 8, 9, 11 and 101, with y depending on cluster size) immobilized titania nanoparticles. The were washed toluene at 100 °C or calcined 200 remove the organic ligand. From position Au 4f(7/2) peak it is concluded that size not altered through deposition. analysis phosphorous spectra, can be applied heat treatment removes ligands. Washing calcination leads partial...
Abstract For the realization of a next‐generation energy society, further improvement in activity water‐splitting photocatalysts is essential. Platinum (Pt) predicted to be most effective cocatalyst for hydrogen evolution from water. However, when number active sites increased by decreasing particle size, Pt easily oxidized and thereby loses its activity. In this study, method load ultrafine, monodisperse, metallic nanoclusters (NCs) on graphitic carbon nitride developed, which promising...
This work succeeded in fabricating the platinum 17-atom nanocluster-supported carbon black catalyst with high oxygen reduction reaction activity.
Biomass is an important sustainable carbon source and converting biomass intermediates into value-added chemicals/fuels using a green technology promising pathway. Dual functional photocatalysis can be used to "hit two birds with one stone" via the simultaneous production of H2 valorisation intermediates. CdIn2S4 (CIS), exciting photocatalytic material because its high visible light harvesting capacity. Herein, ultrathin CIS nanosheets were fabricated solvothermal method in situ deposition...
Synchrotron XPS was used to investigate a series of chemically synthesised, atomically precise gold clusters Au(n)(PPh3)y (n = 8, 9 and 101, y depending on the cluster size) immobilized anatase (titania) nanoparticles. Effects post-deposition treatments were investigated by comparison untreated samples with analogues that have been heat treated at 200 °C in O2, or O2 followed H2 atmosphere. data shows phosphine ligands are oxidised upon treatment O2. From position Au 4f(7/2) peak it can be...
Abstract Single‐crystal X‐ray crystallography is employed to characterize the reaction species of a full catalytic carbonylation cycle within Mn II ‐based metal–organic framework (MOF) material. The structural insights explain why Rh metalated MOF catalytically competent toward MeBr but only affords stoichiometric turn‐over in case MeI. This work highlights capability MOFs act as platform materials for studying single‐site catalysis heterogeneous systems.
The nature of Au cluster precursor and activation treatments affect catalyst activity in aerobic benzyl alcohol oxidation.
The activity of many water-splitting photocatalysts could be improved by the use RhIII -CrIII mixed oxide (Rh2-x Crx O3 ) particles as cocatalysts. Although further improvement achieved if size Rh2-x was decreased further, it is difficult to load ultrafine (<2 nm) onto a photocatalyst using conventional loading methods. In this study, new method successfully established and used with approximately 1.3 nm narrow distribution BaLa4 Ti4 O15 photocatalyst. obtained exhibited an apparent quantum...
The production of acrylic acid (CH2═CHCO2H) via homogeneous nickel-mediated coupling ethylene (CH2═CH2) and carbon dioxide (CO2) is industrially unattractive at present due to its stoichiometric, rather than catalytic, reaction profile. We utilize density functional theory (DFT) describe the potential energy surface for both an intramolecular deactivation reported hinder desired catalytic activity. calculated route can be divided into three main parts, none which contain significantly large...
We report on the time evolution of sodium tetrachloroaurate (NaAuCl(4)) chemical properties as a function soft X-ray exposure in dried sample silicon surface using photoelectron spectroscopy (XPS). Our investigations provide mechanistic insight into photoreduction kinetics from Au(III) to Au(I) and then Au(0). unambiguously show that XPS occurs stepwise fashion via state. Both steps undergo first-order kinetics.
An extension of the Kick program developed by Bera et al. (J Phys Chem A 2006, 110, 4287) is described in which chemically sensible molecular fragments are used an automated stochastic search algorithm. This results a vastly reduced region potential energy surface can be explored very quickly. We present use this modified algorithm to for low-lying isomers, and we candidates global minimum, range chemical systems. highlight usefulness procedure exploring reactions molecules with transition...
Well-defined Au–TiO2 materials were synthesized by deposition of triphenylphosphine-protected Au9 clusters on TiO2 (Aeroxide P-25), pre-treated in eight different ways and subsequently exposed to two post-treatments. X-ray photoelectron spectroscopy UV–vis diffuse reflectance studies showed that most cases the PPh3 ligand shell was removed upon even before post-treatment, coinciding with some cluster aggregation. However, deposited treated using H2SO4 H2O2 remarkable resistance aggregation,...
Structural asymmetry is introduced into porous Cu<sub>4</sub>L<sub>4</sub> metal–organic cages through the crystallisation-driven convergence of a dynamic combinatorial library.
The laser induced fluorescence spectrum of jet-cooled CoC near 750 nm has been measured at high resolution following the reaction laser-ablated cobalt atoms with methane. X2Σ+ ground state is an unusually good example Hund’s case (bβS) coupling. Since Co a nuclear spin I=7/2, each rotational level split by Fermi contact interaction into G=3 and G=4 components, where G=I+S; splitting for N=0 more than 0.5 cm−1. begins to uncouple toward (bβJ) increasing rotation. Transitions various 2Π...
Oxygen deficient cerium oxide cluster ions, Ce(n)O(m)(+) (n = 2-10, m 1-2n) were prepared in the gas phase by laser ablation of a rod. The reactivity ions was investigated using mass spectrometry, finding that oxygen clusters are able to extract atoms from CO, CO2, NO, N2O, and O2 phase. transfer reaction is explained terms energy balance between bond dissociation an containing molecule affinity oxygen-deficient clusters, which supported DFT calculations. reverse reaction, i.e., formation...
Chemically made, atomically precise phosphine-stabilized clusters Au9(PPh3)8(NO3)3 were deposited on titania and silica from solutions at various concentrations the samples heated under vacuum to remove ligands. Metastable induced electron spectroscopy was used determine density of states surface, X-ray photoelectron for analysing composition surface. It found Au9 cluster that ligands react with substrate. Based analysis using singular value decomposition algorithm, series MIE spectra can be...
CdIn2S4–based photocatalysts are promising in many energy and environmental applications such as hydrogen production, selective oxidation of organics, some dual-functional systems. In this review, the recent advances development...
Photocatalytic H2O2 production is a green and sustainable alternative to the commercial anthraquinone process that requires large energy input causes high CO2 emission. Gold (Au) co-catalysts are often employed as catalytic active sites in photocatalytic material designs. However, little known about effect of Au particle size, particularly different size domains (cluster vs nanoparticle), on synthesis. Here we Au9 clusters Au101 nanoparticles supported sulfur-doped graphitic carbon nitride...
The dynamics of the reaction H2CO+hν(λ≈330 nm)→H+HCO have been studied following excitation formaldehyde into Ã(1A2) state, just above dissociation threshold X̃(1A1) state. Formaldehyde was excited via specific J, Ka, Kc rotational states and ensuing distribution HCO measured by fully resolving N, Kc, J=N±S fragment. When only N Ka quantum numbers both formyl radical are considered, distributions generally modeled well phase space theory (PST). Within ≈10 cm−1 threshold, however, PST...
Triphenylphosphine ligand-protected Au9 clusters deposited onto titania nanosheets show three different atomic configurations as observed by scanning transmission electron microscopy. The are a 3-dimensional structure, corresponding to the previously proposed core of clusters, and two pseudo-2-dimensional (pseudo-2D) structures, newly found this work. With help density functional theory (DFT) calculations, pseudo-2D structures attributed low energy, de-ligated formed through interaction with...