Field emission from open multiwall carbon nanotubes: A case of non-Fowler-Nordheim behavior.

Zestanakis, PA; Xanthakis, JP

dc.contributor.author	Zestanakis, PA	en
dc.contributor.author	Xanthakis, JP	en
dc.date.accessioned	2014-03-01T01:28:23Z
dc.date.available	2014-03-01T01:28:23Z
dc.date.issued	2008	en
dc.identifier.issn	0021-8979	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18838
dc.subject.classification	Physics, Applied	en
dc.subject.other	Carbon	en
dc.subject.other	Cleaning	en
dc.subject.other	Electric currents	en
dc.subject.other	Field emission	en
dc.subject.other	Multiwalled carbon nanotubes (MWCN)	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Nanostructures	en
dc.subject.other	Nanotubes	en
dc.subject.other	Two dimensional	en
dc.subject.other	Angle dependences	en
dc.subject.other	Cleaning processes	en
dc.subject.other	Emission charac-teristics	en
dc.subject.other	Image potentials	en
dc.subject.other	Low fields	en
dc.subject.other	Multi-dimensional	en
dc.subject.other	Multiwall carbon nanotubes	en
dc.subject.other	Non linearities	en
dc.subject.other	Planar surfaces	en
dc.subject.other	Transmission coefficients	en
dc.subject.other	WKB methods	en
dc.subject.other	Carbon nanotubes	en
dc.title	Field emission from open multiwall carbon nanotubes: A case of non-Fowler-Nordheim behavior.	en
heal.type	journalArticle	en
heal.identifier.primary	10.1063/1.3008040	en
heal.identifier.secondary	094312	en
heal.identifier.secondary	http://dx.doi.org/10.1063/1.3008040	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Open multiwall carbon nanotubes (MWCNTs) have a non-Fowler-Nordheim (non-FN) emission characteristic, even after the cleaning process, in contrast to closed carbon nanotubes (CNTs), which become FN-like after the cleaning process. We have calculated the emitted current from open MWCNTs using our previously calculated transmission coefficients, which were derived by the use of a multidimensional WKB method. Our results reveal that the non-FN behavior of open CNTs should be attributed to the following two features of the two-dimensional (angle and distance dependent) tunneling potential V(r, theta). (a) V(r, theta) deviates from the approximately linear (with distance) potentials associated with planar surfaces with this nonlinearity having nothing to do with the image potential. (b) The individual walls of the MWCNTs essentially see different tunneling potentials due to the angle dependence of V(r, theta). From our calculations we also find that only a few layers of the open MWCNTs contribute to the current at low fields. At higher fields, more layers become active. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3008040]	en
heal.publisher	AMER INST PHYSICS	en
heal.journalName	Journal of Applied Physics	en
dc.identifier.doi	10.1063/1.3008040	en
dc.identifier.isi	ISI:000260941700108	en
dc.identifier.volume	104	en
dc.identifier.issue	9	en