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Percolation of two-dimensional multiwall carbon nanotube networks

Authors
Lee, Heon SangYun, Chang HunKim, Sun KugChoi, Ji HoonLee, Cheol JinJin, Hyoung-JoonLee, HyunjungPark, Sang JoonPark, Min
Issue Date
28-9월-2009
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.95, no.13
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
95
Number
13
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/119294
DOI
10.1063/1.3238326
ISSN
0003-6951
Abstract
We highlight the significance of multiwall carbon nanotube (MWCNT) shape on the electrical percolation. For rodlike MWCNTs, percolation threshold depends on aspect ratio (L/d). For random coil-like MWCNTs, the percolation threshold does not depend on L/d but depends on the shape factor of MWCNTs represented by the ratio between static bending persistence length and diameter. Surface resistivities of various MWCNTs converge into single curve when we plot their dimensionless surface concentration versus surface resistivity. The surface resistivity of MWCNT films decrease with increasing temperature, particularly at low concentrations, indicating the films can be used as a negative temperature coefficient thermistor. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3238326]
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