Open Access Nano Express

Effects of the electrical conductivity and orientation of silicon substrate on the synthesis of multi-walled carbon nanotubes by thermal chemical vapor deposition

Hyonkwang Choi1, Jaeseok Gong1, Yeongjin Lim1, Ki Hong Im2 and Minhyon Jeon1*

Author Affiliations

1 Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University, Gimhae, Gyungnam 621-749, Republic of Korea

2 Samsung Electronics Co, Suwon, Gyeonggi 443-742, Republic of Korea

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Nanoscale Research Letters 2013, 8:110  doi:10.1186/1556-276X-8-110

Published: 27 February 2013

Abstract

We studied the effects of the electrical conductivity and orientation of silicon substrate on both catalytic Fe thin film and the structure and morphology of multi-walled carbon nanotube (MWNT) grown by low-pressure chemical vapor deposition. Both p-type Si(100) and Si(111) substrates with three different doping concentrations (high, low, undoped) were used to evaluate the formation of catalytic nanoparticles and the growth of MWNTs. The morphology of catalytic nanoparticles such as size and density was characterized by field-emission scanning electron microscopy, Cs-corrected energy-filtered transmission electron microscopy, and X-ray photoelectron spectroscopy. Structural characteristics of MWNTs grown on different combinations of silicon substrate orientation and electrical conductivities (σ) were also systematically analyzed. Based on the experimental results, growth modes of MWNTs could be controlled by choosing an appropriate combination of σ and orientation of Si substrates.

Keywords:
Multi-walled carbon nanotube; Catalytic nanoparticle; Substrate effect