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Title: Synthesis of "cactus" top-decorated aligned carbon nanotubes and their third-order nonlinear optical properties
Authors: Li, P.H.
Qu, Y.L. 
Xu, X.J. 
Zhu, Y.W. 
Yu, T. 
Chin, K.C. 
Mi, J.
Gao, X.Y. 
Lim, C.T. 
Shen, Z.X.
Wee, A.T.S. 
Ji, W. 
Sow, C.H. 
Keywords: Carbon Nanotubes
Nonlinear Optical Properties
Issue Date: Apr-2006
Citation: Li, P.H., Qu, Y.L., Xu, X.J., Zhu, Y.W., Yu, T., Chin, K.C., Mi, J., Gao, X.Y., Lim, C.T., Shen, Z.X., Wee, A.T.S., Ji, W., Sow, C.H. (2006-04). Synthesis of "cactus" top-decorated aligned carbon nanotubes and their third-order nonlinear optical properties. Journal of Nanoscience and Nanotechnology 6 (4) : 990-995. ScholarBank@NUS Repository.
Abstract: We report a new morphology of "cactus" top-decorated aligned carbon nanotubes grown by the PECVD method using pure C 2H 2 gas. Unlike most previous reports, no additional carrier gas is used for pretreatment. Carbon nanotubes can still grow and maintain the tubular structure underneath the "cactus" tops. It is proposed that the H atoms produced by the dissociation of C 2H 2 activate the catalyst nanoparticles. Scanning electron microscopy (SEM) shows that the top "cactus" morphology is composed of a large quantity of small nanosheets. Transmission electron microscopy (TEM) reveals the amorphous carbon nature of these "cactus" structures. The formation of these "cactus" structures is possibly due to covalent absorption and reconstruction of carbon atoms on the broken graphite layers of nanotubes produced by the strong ion bombardment under plasma. The third-order optical nonlinearities and nonlinear dynamics are also investigated. The third-order nonlinear susceptibility magnitude |χ (3)| is found to be 2.2 × 10 -11 esu, and the relaxation process takes place in about 1.8 ps. Copyright © 2006 American Scientific Publishers. All rights reserved.
Source Title: Journal of Nanoscience and Nanotechnology
ISSN: 15334880
DOI: 10.1166/jnn.2006.167
Appears in Collections:Staff Publications

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