A5044043841- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Electrochemical sensors and biosensors
- Diamond and Carbon-based Materials Research
- Supercapacitor Materials and Fabrication
- Molecular Junctions and Nanostructures
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advanced Sensor and Energy Harvesting Materials
- Polymer Surface Interaction Studies
- Force Microscopy Techniques and Applications
- Nanofabrication and Lithography Techniques
- Electrospun Nanofibers in Biomedical Applications
- Luminescence and Fluorescent Materials
- Layered Double Hydroxides Synthesis and Applications
- Optical and Acousto-Optic Technologies
- TiO2 Photocatalysis and Solar Cells
- Membrane Separation and Gas Transport
- Electron and X-Ray Spectroscopy Techniques
- Neuroscience and Neural Engineering
- Carbon and Quantum Dots Applications
- Magneto-Optical Properties and Applications
- Tribology and Wear Analysis
- Catalytic Processes in Materials Science
- Catalysis for Biomass Conversion
University of Oxford
2010-2019
Imperial College London
2013-2016
Transnational Press London
2015-2016
Oxford Research Group
2016
London Centre for Nanotechnology
2015
Queen's University
2010
Oregon Social Learning Center
1980
Electrically active constructs can have a beneficial effect on electroresponsive tissues, such as the brain, heart, and nervous system. Conducting polymers (CPs) are being considered components of these because their intrinsic electroactive flexible nature. However, clinical application has been largely hampered by short operational time due to decrease in electronic properties. We show that, immobilizing dopant conductive scaffold, we prevent its electric deterioration. grew polyaniline...
The demonstration that Nanocrystalline Diamond (NCD) can retain the superior Young's modulus (1,100 GPa) of single crystal diamond twinned with its ability to be grown at low temperatures (<450 {\deg}C) has driven a revival into growth and applications NCD thin films. However, owing competitive crystals resulting film roughness evolves thickness, preventing films from reaching their full potential in devices where smooth is required. To reduce this roughness, have been polished using...
Incubation of PANI films in physiological conditions leads to deprotonation and loss dopant from the polymer backbone.
In this work, we describe three simple modifications to carbon electrodes that were found improve the detection of an exemplar neurotransmitter (dopamine) in presence physiological interferents (ascorbic acid and/or uric acid). First, electro-oxidation ascorbic acid, as a pretreatment, at boron-doped diamond electrode (BDE) interfaces is studied. This treatment did suppress oxidation signal, but only manner suitable for single-use high concentrations dopamine (i.e., > 1 μM). Second,...
A viable electrochemical solution to lead-based hybrid organic–inorganic perovskites photovoltaic material recycling is demonstrated.
Advanced carbon materials are important for the next-generation of energy storage apparatus, such as electrochemical capacitors. Here, physical and properties carbonised filter paper (FP) were investigated. FP is comprised pure cellulose a standardised material. After carbonisation at temperatures ranging from 600 to 1700 °C, was contaminant-free, containing only some oxygenated species, its primary fibre structure retained (diameter ≈20-40 μm). The observed enhancement in conductivity...
Highly rigid polymers of intrinsic microporosity (PIM) offer novel high temperature template materials for the formation nano-structured metal oxides, here nanostructured Pr<sub>6</sub>O<sub>11</sub>.
Electron transfer at pegylated electrode surfaces is suppressed for Fe(CN)<sub>6</sub><sup>3−/4−</sup> and then recovered in the presence of ferrocene-dimethanol.
A novel two-photon-fluorescent N,O-heteroatom-rich carbon nanomaterial has been synthesized and characterized. The new nanoparticles were produced by hydrothermal conversion from a one-photon-fluorescent poly(4-vinylpyridine) precursor (P4VP). carbonized particles (cP4VP dots) with nonuniform particle diameter (ranging sub-6 to 20 nm some aggregates up 200 nm) exhibit strong fluorescence properties in different solvents have also investigated for applications cell culture media. cP4VP dots...
The surface functionalities of commercial sulfonate-modified carbon nanoparticles (ca. 9-18 nm diameter, Emperor 2000) have been converted from negatively charged to positively via sulfonylchloride formation followed by reaction with amines give suphonamides. With ethylenediamine, the resulting exhibit water solubility (in absence added electrolyte), a positive zeta-potential, and ability assemble into insoluble porous films layer-by-layer deposition employing alternating negative...
Polystyrene thin films were functionalized using a facile two-step chemical protocol involving carbene insertion followed by azo-coupling, permitting the introduction of range functional groups, including aniline, hexyl, amine, carboxyl, phenyl, phosphonate diester, and ethylene glycol. X-ray photoelectron spectroscopy (XPS) confirmed success modification with grafting density at least 1/10th typical loading (10(14)-10(15)) self-assembled monolayer (SAM). In situ, real-time quartz crystal...
Abstract Dioctylaminesulfonamide‐modified carbon nanoparticles are characterised and employed as high surface area substrate for (i) coenzyme Q10 (ii) 1,2‐dimyristoyl‐ sn ‐glycero‐3‐phosphocholine (or DMPC) ‐ redox processes. The provide a highly hydrophobic with ca. 25 Fg −1 capacitance when bare. or DMPC‐Q10 immobilised onto the lower capacitance, but give rise to well‐defined pH‐dependent voltammetric responses. deposit shows similar characteristics those of Q10, better reproducibility...
The synthesis of boron‐doped diamond (BDD) electrodes, decorated with Pt–Cu or pure Cu nanoparticles is described in this study. A two‐step electrochemical method involving the electrodeposition Cu, followed by Pt was used to synthesise former. activity Pt–Cu/BDD electrode evaluated towards methanol oxidation and compared catalytic Pt/BDD itself. Higher current densities less fouling at catalysts during seen alone. Also, a simple cost effective modify BDD using explored. High sensitivity...
Covalently grafted KolliphorEL (a poly(ethylene glycol)-based transporter molecule for hydrophobic water-insoluble drugs; MW, ca. 2486; diameter, 3 nm) at the surface of a glassy-carbon electrode strongly affects rate electron transfer aqueous redox systems such as Fe(CN)63–/4–. XPS data confirm monolayer grafting after electrochemical anodization in pure KolliphorEL. On basis voltammetry and impedance measurements, charge process Fe(CN)63–/4– probe is completely blocked absence "guest"....
Abstract This work compares electrodeposited and drop‐cast (DC) AuNPs on oxygen hydrogen terminated boron‐doped diamond (BDDO BDDH). The samples were characterized using a range of electrochemical physical surface methods investigated as mercury sensors. Overall, deposited by either method found to be more electrochemically active BDDH than BDDO, although DC‐AuNPs adsorbed onto BDDO BDDH. sensing experiments, carried out square‐wave anodic stripping voltammetry (SWASV) showed that lower Hg...
In this report we demonstrate a versatile (and potentially low-cost) cellulose nano-whisker-based surface carbonisation method that allows well-defined films of TiO(2) nanoparticles surface-modified with carbon to be obtained. layer-by-layer electrostatic deposition process based on nanoparticles, nano-whiskers, and poly(diallyl-dimethylammonium) or PDDA are employed control the ratio TiO(2). Characterisation optical, AFM, XRD, XPS methods is reported. Electrochemical measurements suggest...
Negatively charged carbon nanoparticles (surface-phenylsulfonated) are "wrapped" in a poly(4-vinylpyridine) cationomer and hydrothermally converted into pH-responsive core–shell nano-composite. With "thin shell" this nano-material (ca. 20–40 nm diameter) is water-insoluble but readily dispersed ethanol deposited onto electrodes. Zeta-potential measurements suggest point of zero charge (PZC) at ca. pH 4.5 with negative functional groups dominating the more alkaline range positive acidic...
Abstract Abstractauthoren This study describes the decoration of hydrogen‐ and oxygen‐terminated boron‐doped diamond electrodes (BDD) with three different loadings Ni. The Ni was deposited electrochemically for 600, 400, 100 s on both hydrogen‐terminated BDD (BDDH) (BDDO). Scanning electron microscopy (SEM) showed that all particles were roughly spherical in shape, but distribution size varied electrode termination: a uniform coverage particle dependent deposition duration achieved BDDH,...
Resistances of devices or samples material can be measured accurately by placing the sample between conducting plates attached to an electrooptic crystal. The are then charged, and voltage-induced birefringence in crystal is monitored optically. In this way very small conduction currents without introducing additional current path electrodes. up 10(16) ? have been using LiNbO(3) as