A5065979852- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Graphene research and applications
- Advanced ceramic materials synthesis
- Semiconductor materials and devices
- X-ray Spectroscopy and Fluorescence Analysis
- Carbon Nanotubes in Composites
- Iron oxide chemistry and applications
- Metal and Thin Film Mechanics
- Ferroelectric and Piezoelectric Materials
- Magnetic properties of thin films
- Microstructure and Mechanical Properties of Steels
- Force Microscopy Techniques and Applications
- Advancements in Battery Materials
- Advanced materials and composites
- Nanoparticles: synthesis and applications
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear materials and radiation effects
- Diamond and Carbon-based Materials Research
- Aluminum Alloys Composites Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Microwave Dielectric Ceramics Synthesis
University of Leeds
2016-2025
Sci-Tech Daresbury
2015-2017
Daresbury Laboratory
2010-2017
Institute of Materials Research of the Slovak Academy of Sciences
2016
University of Edinburgh
2013
Institute for Materials Research, Tohoku University
2008-2010
University of York
2010
Montana State University
2010
Brookhaven National Laboratory
2010
Kyushu University
2002
Pd does it alone: Tailored heterogeneous catalysts offer exciting, alternative, clean technologies for regioselective molecular transformations. A mesoporous alumina support stabilizes atomically dispersed PdII surface sites (see picture, C light gray, O red, dark Al purple, H white), thereby dramatically enhancing catalytic performance in the aerobic selective oxidation of alcohols.
The electron energy loss and X-ray absorption spectra of two phases titanium dioxide-rutile anatase-are reported. Although the nearest-neighbour environments oxygen in both these structures are very similar, noticeable differences observed between spectra. Attempts to model using real-space multiple-scattering calculations reasonably successful at Ti K O edges. authors propose an interpretation L2.3 edge, notably for presence a previously unobserved splitting on L3 edge.
An adjustable and scalable method for the continuous flow synthesis of cupric oxide nanoparticles (CuO NPs), targetted reduction their activity to synthetic biomembranes inform fabrication (NPs) with reduced toxicity commercial applications. By manipulating key factors; temperature, residence time, ratio precursor reductant, precise control over morphology CuO NPs is achieved X-ray diffraction (XRD) transmission electron microscopy (TEM) confirming formation needle-shaped NPs....
Solid‐state 27 Al and 29 Si magic angle spinning NMR spectroscopy has been combined with electron energy loss carried out in the transmission microscope to determine location of substituting a semicrystalline C‐S‐H gel present hydrated synthetic slag glass. The is found contain mainly pentameric silicate chains which central silicon substituted by aluminum.
Research Article| July 01, 2009 Plant-driven fungal weathering: Early stages of mineral alteration at the nanometer scale Steeve Bonneville; Bonneville * 1Earth and Biosphere Institute, School Earth Environment, University Leeds, Leeds LS2 9JT, UK *E-mail: s.bonneville@see.leeds.ac.uk. Search for other works by this author on: GSW Google Scholar Mark M. Smits; Smits 2Department Animal Plant Sciences, Sheffield, Western Bank, Sheffield S10 2TN, Andrew Brown; Brown 3Leeds Electron Microscopy...
Electron energy-loss near-edge structure (ELNES) is a technique that can be used to measure the electronic (i.e. bonding) in materials with subnanometre spatial resolution. This review covers theoretical principles behind technique, experimental procedures necessary acquire good ELNES spectra, including potential artefacts, and gives examples relevant science.
Oxygen K-edge electron-energy-loss spectra have been recorded for several transition-metal oxides (NiO, MnO, ${\mathrm{MnO}}_{2}$, ${\mathrm{TiO}}_{2}$, ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$, ${\mathrm{Mn}}_{2}$${\mathrm{O}}_{3}$) of different crystal structures. The origin the distinct features which can be identified over 40 eV above threshold is discussed in terms resonance scattering within shells neighboring anionic backscatterers. Full multiple-scattering calculations corroborate and...
The structural properties of both nanodiamond particles synthesized by detonation and the products their transformation into carbon onions via vacuum annealing at 1000 1500°C have been studied using high-resolution transmission electron microscopy (HRTEM), energy-loss spectroscopy, x-ray diffraction (XRD), small-angle scattering (SAXS), Raman spectroscopy. advantages UV spectroscopy over visible for analysis these nanomaterials are demonstrated. It was found that a composite core-shell...
Ferritin, the major iron storage protein, has dual functions; it sequesters redox activity of intracellular and facilitates turn-over. Here we present high angle annular dark field (HAADF) images from individual hepatic ferritin cores within tissue sections, these were obtained using spherical aberration corrected scanning transmission electron microscopy (STEM) under controlled fluence. HAADF suggest a cubic morphology polycrystalline (ferrihydrite) subunit structure that is not evident in...
The nanoscale magnetic structure of FeRh epilayers has been studied by polarized neutron reflectometry. Epitaxial films with a nominal thickness $500\text{ }\text{\AA{}}$ were grown on MgO (001) substrates via molecular-beam epitaxy and capped $20\text{ MgO. show clear transition from the antiferromagnetic (AF) state to ferromagnetic (FM) increasing temperature. Surprisingly possess FM moment even at temperature 80 K below AF-FM film. We have quantified magnitude spatial extent this moment,...
The influence of stress modes and comminution conditions on the effectiveness particle size reduction a common catalyst support; γ-Alumina is examined through comparative assessment three different mill types. Air jet milling found to be most effective in reducing from d90 37 µm 2.9 compared planetary ball (30.2 µm) single (10.5 µm). XRD TEM studies confirm that causes phase transformation less desired α-Alumina resulting notable decrease surface area 136.6 m2/g 82.5 as measured by BET...
Ultra-small gold nanoclusters (AuNCs) have unique size-dependent optical, electrical and chemical properties. They emerged as a new nanomaterial with broad applications in optoelectronics, catalysis, biosensing, bioimaging. Several strategies been exploited to prepare AuNCs of different "magic number" sizes, using templates e.g. dendrimers, polyethyleneimines, peptides, more recently, proteins. Notwithstanding, almost all bio-template-protected reported so far exhibit fairly low fluorescence...
Stable and brightly luminescent amine-terminated Si nanoparticles (SiNPs) have been synthesized from electrochemically etched porous silicon (PSi). The surface amine termination was confirmed by FTIR, NMR, XPS studies. mean diameter of the crystal core 4.6 nm measured transmission electron microscopy (TEM), which is in a good agreement with size obtained dynamic light scattering (DLS). dry, product can be bulk wafers less than 4 h. This represents significant improvement over similar...
Transition metal/nitrogen/carbon (M-N/C) catalysts are considered as one of the most promising candidates to replace Pt/C for oxygen reduction reactions (ORRs). Here, we have designed novel reduced graphene oxide (rGO)-supported Fe-N-doped carbon (Fe-N-C/rGO) via simple pyrolysis polypyrrole (Ppy)-FeO-GO composites. The as-prepared induced an onset potential 0.94 V and a half-wave 0.81 in alkaline solutions, which is much better than those counterpart N-C N-C/rGO comparable that catalysts....
One of the keys behind success modern semiconductor technology has been ion implantation silicon, which allows its electronic properties to be tailored. For similar purposes, heteroatoms have introduced into carbon nanomaterials both during growth and using post-growth methods. However, due nature samples, it challenging determine whether incorporated lattice as intended, with direct observations so far being limited N B dopants, incidental Si impurities. Furthermore, these materials is more...
Abstract 2D metal nanomaterials offer exciting prospects in terms of their properties and functions. However, the ambient aqueous synthesis atomically‐thin, metallic represents a significant challenge. Herein, freestanding atomically‐thin gold nanosheets with thickness only 0.47 nm (two atomic layers thick) are synthesized via one‐step approach at 20 °C, using methyl orange as confining agent. Owing to high surface‐area‐to‐volume ratio, abundance unsaturated atoms exposed on surface large...
Small aromatic thiol molecules HS−C6H4−X, where X = OH, COOH, NH2, and CH3, have been used to stabilize gold nanosized clusters. The physical properties of the surfactant-coated nanoparticles, both in solution as thin films, were found be dependent upon nature functional group X. In particular it was that particles bearing COOH NH2 functionalities prone significant aggregation through hydrogen bond formation.