ORCID Profile
0000-0002-8499-8749
Current Organisation
University of Oxford
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Publisher: Wiley
Date: 12-06-2020
Publisher: Elsevier BV
Date: 10-2002
Publisher: Proceedings of the National Academy of Sciences
Date: 24-03-2009
Abstract: We report the controlled formation and characterization of heterojunctions between carbon nanotubes and different metal nanocrystals (Fe, Co, Ni, and FeCo). The heterojunctions are formed from metal-filled multiwall carbon nanotubes (MWNTs) via intense electron beam irradiation at temperatures in the range of 450–700 °C and observed in situ in a transmission electron microscope. Under irradiation, the segregation of metal and carbon atoms occurs, leading to the formation of heterojunctions between metal and graphite. Metallic conductivity of the metal–nanotube junctions was found by using in situ transport measurements in an electron microscope. Density functional calculations show that these structures are mechanically strong, the bonding at the interface is covalent, and the electronic states at and around the Fermi level are delocalized across the entire system. These properties are essential for the application of such heterojunctions as contacts in electronic devices and vital for the fabrication of robust nanotube–metal composite materials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4FD00058G
Abstract: We present a study of electrocatalysis by an enzyme adsorbed on a range of carbon materials, with different size, surface area, morphology and graphitic structure, which are either commercially available or prepared via simple, established protocols. We choose as our model enzyme the hydrogenase I from E. coli (Hyd-1), which is an active catalyst for H 2 oxidation, is relatively robust and has been demonstrated in H 2 fuel cells and H 2 -driven chemical synthesis. The carbon materials were characterised according to their surface area, surface morphology and graphitic character, and we use the electrocatalytic H 2 oxidation current for Hyd-1 adsorbed on these materials to evaluate their effectiveness as enzyme electrodes. Here, we show that a variety of carbon materials are suitable for adsorbing hydrogenases in an electroactive configuration. This unified study provides insight into selection and design of carbon materials for study of redox enzymes and different applications of enzyme electrocatalysis.
Publisher: Elsevier BV
Date: 07-2002
Publisher: AIP Publishing
Date: 29-04-2002
DOI: 10.1063/1.1469599
Abstract: We observed high N contents inside BN fullerenelike multilayered nanocages (ca. 30–100 nm) formed by reacting CNx nanotubes (x⩽0.1) and B2O3 in a N2 atmosphere at 1985–2113 K. High-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy, energy dispersion x-ray spectroscopy, electron diffraction analysis, spatially resolved energy-filtered TEM, and in situ TEM electron irradiation studies suggest that super-high pressures (of several GPa) are generated inside nanocages, responsible of crystallizing gaseous nitrogen trapped within the BN shells. In addition, high-pressure-induced phase transformation of graphiticlike BN into diamondlike cubic BN occurs inside the nanocages. Thus, BN nanocages play an unusual role of super-high-pressure nanocells.
Publisher: Elsevier BV
Date: 09-2004
Publisher: Elsevier BV
Date: 2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1SC00295C
Abstract: Heterogeneous chemo-bio catalytic hydrogenation is an attractive strategy for clean, enantioselective CX reduction.
Publisher: Wiley
Date: 17-11-2003
Publisher: Elsevier BV
Date: 03-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CC04465H
Abstract: We describe the implementation of a system of immobilised enzymes for H 2 -driven NADH recycling coupled to a selective biotransformation to enable H 2 -driven biocatalysis in flow.
Publisher: AIP Publishing
Date: 20-02-2003
DOI: 10.1063/1.1555713
Abstract: Nanotubular ropes composed of aligned multiwalled nanotubes having electrically insulating BN-rich outer shells and semiconducting B–C–N inner shells were synthesized through the reaction of aligned CNx (x⩽0.1) nanotube mats with boron oxide and nitrogen at ∼2000–2110 K. The atomic structure and chemical composition of the ropes were analyzed by high-resolution transmission and energy-filtered (Omega filter) electron microscopy. In idual ropes display perfect insulating performance of BN-rich outer layers and excellent field emission and thus conductive properties of inner B–C–N layers. A semiconducting nanometer-scale cable with built-in electrical insulation has thus been realized.
Publisher: Springer Science and Business Media LLC
Date: 03-2003
Publisher: American Chemical Society (ACS)
Date: 07-2020
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Nicole Grobert.