Nanograin VO2 in the Metal Phase: A Plasmonic System with falling DC Resistivity as Temperature Rises

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dc.contributor.author Gentle, Angus en_US
dc.contributor.author Maaroof, Abbas en_US
dc.contributor.author Smith, Geoff en_US
dc.date.accessioned 2009-12-21T02:33:06Z
dc.date.available 2009-12-21T02:33:06Z
dc.date.issued 2007 en_US
dc.identifier 2006006680 en_US
dc.identifier.citation Gentle Angus, Maaroof Abbas, and Smith Geoffrey 2007, 'Nanograin VO2 in the Metal Phase: A Plasmonic System with falling DC Resistivity as Temperature Rises', Institute of Physics (UK), vol. 18, pp. 025202-025209. en_US
dc.identifier.issn 0957-4484 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/4387
dc.description.abstract Thin films of vanadium dioxide with grain size smaller than 60nm have a metallic phase with excellent plasmonic response,but their dc resistivity falls as temperature rises to values above the metal-insulator transition. At the transition optical switching is complete, but the switch in dc resistance is incomplete. In the metallic phase nanograin and large grain samples have similar values of both plasma frequency and relaxation rate. However, plasmonic response in nanograins is stronger due to the absence of a low energy interband transition foun din large grain fims. Conductivity rises with thermal activation energy of 108 meV, which is well below that in rthe semiconductor phase. Possible mechanisms for non-metal' like dc behaviour in this plasmonic system are briefly discussed. They include fluctuations which are coherent in nanograins but incoherent for larger grains. Nanoscale systems seem preferable for optical switching applications and large grain structures for dc switching work. en_US
dc.publisher Institute of Physics (UK) en_US
dc.relation.hasversion Accepted manuscript version
dc.title Nanograin VO2 in the Metal Phase: A Plasmonic System with falling DC Resistivity as Temperature Rises en_US
dc.parent Nanotechnology en_US
dc.journal.volume 18 en_US
dc.journal.number 2 en_US
dc.publocation Bristol, UK en_US
dc.identifier.startpage 025202 en_US
dc.identifier.endpage 025209 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 090400 en_US
dc.personcode 000307 en_US
dc.personcode 010727 en_US
dc.personcode 730312 en_US
dc.percentage 100 en_US
dc.classification.name Chemical Engineering en_US
dc.classification.type FOR-08 en_US
dc.staffid 730312 en_US


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