Effect of Graphitization on the Structures and Conducting Property of Carbon Nanotubes

doi:10.3724/sp.j.1077.2009.00535

Abstract

Abstract: Turbostratic carbon nanotubes (CNTs) were treated in nitrogen atmosphere at 2700℃. Highresolution transmission electron microscope (HRTEM) was used to investigate the structural changes of CNTs. Meanwhile, the conducting property was measured via a selfbuilt setup installed in TEM. The structures of CNTs are found to change into bamboolike or tubular cones after graphitization. The apex angles of cones rang from 10° to 30°, and the tubular diameter ranges from 10nm to 40nm. Electron diffraction analysis reveals that an additional overlap angle is involved in the disclination operation of cones, suggesting the helicalconical structural characteristics of CNTs. The highly curved filamental structures are stabilized via interlayer coincidence site lattices of ∑13, ∑7, and ∑19type. The conducting measurement indicates that the helical conical CNTs are semiconductors.

Key words: carbon nanotubes, graphitization, helical cone, conducting property

CLC Number:

TQ343

ZHANG Lin-Lin,XU Fang-Fang,FENG Jing-Wei,RUAN Mei-Ling. Effect of Graphitization on the Structures and Conducting Property of Carbon Nanotubes[J]. Journal of Inorganic Materials, DOI: 10.3724/sp.j.1077.2009.00535.

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