Theoretical calculation of spatial variation of the transmission coefficient of closed carbon nanotubes

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dc.contributor.author Xanthakis, JP en
dc.contributor.author Kokkorakis, GC en
dc.date.accessioned 2014-03-01T02:43:00Z
dc.date.available 2014-03-01T02:43:00Z
dc.date.issued 2004 en
dc.identifier.issn 0142-2421 en
dc.identifier.uri http://hdl.handle.net/123456789/31176
dc.subject Carbon nanotubes en
dc.subject Field emission en
dc.subject Local field en
dc.subject Transmission coefficient en
dc.subject.classification Chemistry, Physical en
dc.subject.other Carbon nanotubes en
dc.subject.other Computer simulation en
dc.subject.other Electron emission en
dc.subject.other Electron transitions en
dc.subject.other Electron transport properties en
dc.subject.other Fermi level en
dc.subject.other Field emission en
dc.subject.other Local field en
dc.subject.other Transmission coefficient en
dc.subject.other Surface reactions en
dc.title Theoretical calculation of spatial variation of the transmission coefficient of closed carbon nanotubes en
heal.type conferenceItem en
heal.identifier.primary 10.1002/sia.1730 en
heal.identifier.secondary http://dx.doi.org/10.1002/sia.1730 en
heal.language English en
heal.publicationDate 2004 en
heal.abstract We have calculated the spatial (angular) variation of the transmission coefficient of closed carbon nanotubes (CNT). For the evaluation of the local field outside the tip of the CNT we have used the method described in J. Appl. Phys. 2002; 91: 4580. In the present work we require the local field only inside the classically forbidden area, so we have managed to simplify our previous results and obtain an analytical form for the local potential. This potential was then inserted into the method of Das and Mahanty (Phys. Rev. B 1987; 36: 898) to obtain the transmission coefficient T(theta) at an angle theta to the axis of the tube. We have found a substantial angular variation of T(theta), the determining factor being the local field at the surface of the CNT and, to a lesser extent, the radius of the tube. Decreasing the local field increases the directionality of T(theta) but also decreases the current by several orders of magnitude so that a compromise between directionality and value of the current has to be sought. The directionality also increases with decreasing radius of the tube. The ratio of the height to the radius (h/R) of the CNTs per se plays a minor role, i.e. if one compares CNTs with different h/R but the same local field then minor changes are found. Copyright (C) 2004 John Wiley Sons, Ltd. en
heal.publisher JOHN WILEY & SONS LTD en
heal.journalName Surface and Interface Analysis en
dc.identifier.doi 10.1002/sia.1730 en
dc.identifier.isi ISI:000222377800007 en
dc.identifier.volume 36 en
dc.identifier.issue 5-6 SPEC. ISS. en
dc.identifier.spage 391 en
dc.identifier.epage 394 en

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