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Journal of Nanomaterials
Volume 2014 (2014), Article ID 327398, 5 pages
http://dx.doi.org/10.1155/2014/327398
Research Article

Synthesis of Vertically Aligned Carbon Nanotubes on Silicalite-1 Monolayer-Supported Substrate

1School of Materials Science & Engineering, Yeungnam University, Gyeongsan City, Gyeongbuk 712-749, Republic of Korea
2Department of Materials Science and Engineering, Institute of Processing and Application of Inorganic Materials, Hanseo University, Seosan City, Chungnam 356-706, Republic of Korea

Received 19 October 2013; Accepted 23 December 2013; Published 10 February 2014

Academic Editor: Alireza Talebitaher

Copyright © 2014 Wei Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Monodisperse magnetic nanoparticles (NPs) with the size of ca. 3.5 nm were prepared and used as the catalysts for the synthesis of vertically aligned carbon nanotube (VACNT) arrays. A silicalite-1 microcrystal monolayer was used as the support layer between catalyst NPs and the silicon substrate. Compared to our previous report which used radio-frequency- (rf-) sputtered film as the catalyst, NPs that were synthesized by wet chemical method showed an improved catalytic ability with less agglomeration. The silicalite-1 crystal monolayer acted as an effective “buffer” layer to prevent the catalyst NPs from agglomerating during the reaction process. It is believed that this is the first report that realizes the vertical alignment of CNTs over the zeolite monolayer, namely, silicalite-1 microcrystal monolayer, instead of using the intermediate anodic aluminum oxide (AAO) scaffold to regulate the growth direction of CNT products.