A5038674107- Catalytic Processes in Materials Science
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Advanced Photocatalysis Techniques
- Carbon Nanotubes in Composites
- Advanced Nanomaterials in Catalysis
- Electrocatalysts for Energy Conversion
- Gold and Silver Nanoparticles Synthesis and Applications
- Graphene research and applications
- TiO2 Photocatalysis and Solar Cells
- Catalysis and Oxidation Reactions
- Quantum Dots Synthesis And Properties
- Crystallography and molecular interactions
- Organometallic Complex Synthesis and Catalysis
- Diamond and Carbon-based Materials Research
- CO2 Reduction Techniques and Catalysts
- Asymmetric Synthesis and Catalysis
- Nanowire Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Glycosylation and Glycoproteins Research
- Solid State Laser Technologies
- Gas Sensing Nanomaterials and Sensors
- Supercapacitor Materials and Fabrication
MacDiarmid Institute for Advanced Materials and Nanotechnology
2015-2024
University of Canterbury
2015-2024
The Dodd-Walls Centre for Photonic and Quantum Technologies
2017-2021
Christchurch Clinical Studies Trust
2015-2021
Institute of Geology, Komi Science Centre
2018
Russian Academy of Sciences
2018
Christ University
2014-2017
Callaghan Innovation
2017
Flinders University
2014
Victoria University of Wellington
2012-2014
Highly active and selective: A supported Ru5PtSn nanoparticle cluster (the picture shows an axial projection of a tomogram), prepared from the carbonyl [PtRu5(CO)15(μ-SnPh2)(μ6-C)], is excellent catalyst in single-step hydrogenation dimethyl terephthalate to cyclohexanedimethanol under mild conditions (100 °C, 20 bar H2).
Summary Silver nanoparticles (Ag NP s) are the world's most important nanomaterial and nanotoxicant. The aim of this study was to determine early stages interactions between Ag s plant cells, investigate their physiological roles. We have shown that addition cultivation medium, at levels above 300 mg L −1 , inhibited Arabidopsis thaliana root elongation leaf expansion. This also resulted in decreased photosynthetic efficiency extreme accumulation tissues. Acute application induced a...
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...
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...
The effect of the size gold nanoparticles on their catalytic activity in aerobic oxidation cyclohexene was established using supported that gradually undergo a change during reaction. Two triphenylphosphine-stabilized clusters, Au9(PPh3)8(NO3)3 and Au101(PPh3)21Cl5, were synthesized deposited SiO2. clusters did not retain structure reaction; larger particles with mean diameters ∼5–10 nm formed. By combining kinetic experiments monitoring catalyst transformations transmission electron...
The nature of Au cluster precursor and activation treatments affect catalyst activity in aerobic benzyl alcohol oxidation.
Aerobic oxidation of amines to nitriles under visible light irradiation was catalyzed by supported hydrous ruthenium oxide catalyst. Both LED (blue, green, or red) and the Sun were effective sources for transformation benzylic aliphatic corresponding atmospheric pressure O2. Water can be used as a solvent instead toluene without loss activity selectivity.
Nanoparticles of Co and NiPd, derived from colloidal precursors supported on commercially available non-ordered mesoporous silica, are highly effective, cheap, recyclable industrially viable catalysts for the hydrogenation a range nitro-substituted aromatics under mild conditions.
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,...
This study describes the synthesis and characterization of Pt-doped AgInS2 nanoparticles reports their prospective application as visible-light catalysts for photodegradation frequently used pirimicarb insecticides, which pose serious health environmental concerns. The nanomaterials were characterized by XRD, SEM, TEM, XPS, photoluminescence (PL), UV–vis diffuse reflectance spectra (DRS). presented photocatalytic method water treatment from has advantages using visible light source without...
We report high-sensitivity luminescence thermometry using Yb3+/Er3+ co-doped KY3F10 core and core–shell upconverting nanoparticles. The highest thermal sensitivities of 1.510 ± 0.015%·K–1 (300 K) 1.245 0.013%·K–1 (316 temperature uncertainty 0.11 K were achieved by tuning the excitation wavelength to 975 nm be in-resonant with optical transitions Yb3+ ion. high-resolution spectra recorded observing Er3+, 4S3/2, 4F9/2 → 4I15/2 upconversion fluorescence, fluorescence yield obtained at 10 254...
Crystalline titanium dioxide was synthesised under mild conditions by the thermal degradation of peroxotitanic acid in presence a number fluoride-containing surface modifying agents (NH4F, NH4BF4, NH4PF6, NBu4F, NBu4BF4, NBu4PF6). The resulting materials were characterised PXRD, SEM, HRTEM, XPS and NEXAFS. Particle phase, size, area noticeably affected choice agent. Both cation anion comprising agent affect Ti3+ population materials, with two apparent trends observed: F− > BF4− PF6− NBu4+...
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...
This work reports the preparation and detailed characterization of stannum indium sulfide (SnIn4S8) semiconductor photocatalyst for degradation ethiofencarb (toxic insecticide) under visible-light irradiation. The as-prepared SnIn4S8 showed catalytic efficiency 98% in 24 h optimal operating conditions (pH = 3, catalyst dosage 0.5 g L-1). photodegradation reaction followed pseudo-first-order kinetics. major intermediates have been identified using gas chromatography/mass spectrometry. •O2-...
Silver niobate was synthesized by the solid-state reaction and combined with persulfate (PS) oxidant to advance water treatment application. The AgNbO 3 /PS/Vis system applied successfully for sulfamethoxazole removal from samples.