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|Title:||Comparative studies on the structure and electronic properties of carbon nanotubes prepared by the catalytic pyrolysis of CH4 and disproportionation of CO|
|Authors:||Chen, P. |
|Keywords:||A. Carbon nanotubes|
C. TEM, XPS
D. Electronic structure
|Source:||Chen, P.,Wu, X.,Lin, J.,Li, H.,Tan, K.L. (2000). Comparative studies on the structure and electronic properties of carbon nanotubes prepared by the catalytic pyrolysis of CH4 and disproportionation of CO. Carbon 38 (1) : 139-143. ScholarBank@NUS Repository.|
|Abstract:||A new type of carbon nanotubes prepared by catalytic decomposition of CH4 (CH4-CNT) was studied and compared with carbon nanotubes derived from CO-disproportionation (CO-CNT) and graphite. HRTEM observation reveals that the structural graphene sheets are in a conical hollow shape for CH4-CNT but in a cylindrical shape for CO-CNT. The valence band structure of CH4-CNT is similar to that of CO-CNT but with a lower density-of-state of 2p-π valence electrons. Stronger plasma excitations and additional lower-energy transitions are observed for CH4-CNT by XPS investigations. A reduced work function and a more gradual Fermi edge for CH4-CNT are also detected by He I UPS. © 1999 Elsevier Science Ltd. All rights reserved.|
|Appears in Collections:||Staff Publications|
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