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Raman spectroscopy and field-emission properties of CVD-grown carbon-nanotube films
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2001 (Engelska)Ingår i: Applied Physics a-Materials Science & Processing, Vol. 73, s. 409-418Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Carbon-nanotube films are very efficient cathodes for field-emission devices. This study presents a comprehensive comparison between structural, spectroscopic and field-emission properties of films of aligned and non-aligned multi-wall nanotubes (MWNTs) which are grown by thermal chemical vapour deposition. Three types of films are investigated: vertically aligned MWNTs with clean and coated nanotube side walls as well as non-aligned MWNT films. Raman spectra taken on the aligned MWNT films consist of many lines of first-, second- and third-order signals. Several lines are reported here far the first time for MWNTs. The presence of the surface coating leads to a decrease and broadening of the higher-order signals as well as an increase in the disorder-induced contributions in the first-order regime. The aligned MWNT films have excellent field-emission properties with very high emission current densities and low turn-on and threshold fields. The presence of a surface coating has no impact on the efficiency of the field-emission process. Films of non-aligned MWNTs show considerably reduced electron-emission current densities and larger critical fields.

Ort, förlag, år, upplaga, sidor
2001. Vol. 73, s. 409-418
Identifikatorer
URN: urn:nbn:se:miun:diva-14368OAI: oai:DiVA.org:miun-14368DiVA, id: diva2:435737
Anmärkning
Sveningsson, M Morjan, RE Nerushev, OA Sato, Y Backstrom, J Campbell, EEB Rohmund, FTillgänglig från: 2011-08-19 Skapad: 2011-08-19 Senast uppdaterad: 2011-11-27Bibliografiskt granskad

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Bäckström, Joakim

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