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dc.contributor.authorMtsuko, Davie
dc.date.accessioned2012-10-26T06:59:20Z
dc.date.available2012-10-26T06:59:20Z
dc.date.issued2012
dc.identifier.isbn978-951-39-4723-1
dc.identifier.otheroai:jykdok.linneanet.fi:1233282
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/40102
dc.description.abstractIn this thesis we have studied experimentally electronic transport in mesoscopic hybrid polypyrrole-gold devices and single multiwalled carbon nanotube devices. A novel fabrication technique for mesoscopic conducting hybrid polymer-gold films has been developed. The hybrid polymer-gold films have been fabricated by electrochemical deposition of polypyrrole on a gold nanoisland layer. Temperature dependence of conductance show that the dominant transport mechanism in the polypyrrole-gold films is variable range hopping in the temperature range from 20 K to 300 K. At very low temperature strong nonlinearities in the field dependent conductance are observed. The field dependence follows a phenomenological model that is different from conventional field dependent transport theories probably due to the presence of gold islands embedded in polymer. Further, we have explored size and temperature dependences of basic electrical properties of intermediate sized multiwalled carbon nanotubes in a diameter range, 3 to 10 nm, which has not been systematically explored previously. In particular, we have observed in gate controlled conductance measurements, transport gaps which become more pronounced with decreasing temperature. Many transport features are found to scale with channel length and diameter of the nanotube devices. These include onstate and offstate resistances, on/off ratios, as well as periodicities of Coulombic oscillations. The kind of scaling behaviours observed are a manifestation of both diameter dependent intrinsic bandgaps and localization effects. However, some deviations from the scaling and complex transport gaps have also been observed which may be due to chiralities and possible interwall effects.fi
dc.format.extentverkkoaineisto (96 sivua).
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesResearch report / Department of Physics, University of Jyväskylä
dc.subject.otherelectron transport
dc.subject.otherconducting polymer
dc.subject.othermultiwall carbon nanotube
dc.subject.otheratomic force microscopy
dc.subject.othertemperature dependence
dc.subject.othersize dependence
dc.subject.otherelektronien kuljetusilmiöt
dc.titleExperimental study of electron transport in mesoscopic carbon based nanostructures
dc.typeDiss.
dc.identifier.urnURN:ISBN:978-951-39-4723-1
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineFysiikkafi
dc.relation.issn0075-465X
dc.relation.numberinseriesno. 3/2012
dc.rights.accesslevelopenAccessfi
dc.subject.ysonanorakenteet
dc.subject.ysosähköiset ominaisuudet
dc.subject.ysofysiikka


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