Interaction-mediated growth of carbon nanotubes on acicular silica-coated α-Fe catalyst by chemical vapor deposition--颗粒学报PARTICUOLOGY

Wang, Q., Ning, G., Wei, F., & Luo, G. (2003). Interaction-mediated growth of carbon nanotubes on acicular silica-coated α-Fe catalyst by chemical vapor deposition. China Particuology, 1(6), 253-257. https://doi.org/10.1016/S1672-2515(07)60004-9

Interaction-mediated growth of carbon nanotubes on acicular silica-coated α-Fe catalyst by chemical vapor deposition

Qixiang Wang ^*, Guoqing Ning, Fei Wei, Guohua Luo

Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China

10.1016/S1672-2515(07)60004-9

Volume 1, Issue 6, December 2003, Pages 253-257

Received 8 September 2003, Accepted 5 December 2003, Available online 27 November 2007.

E-mail: wangqixiang@tsinghua.org.cn

Highlights

Abstract

Multi-walled carbon nanotubes (MWNTs) with 20 nm outer diameter were prepared by chemical vapor deposition of ethylene using ultrafine surface-modified acicular α-Fe catalyst particles. The growth mechanism of MWNTs on the larger catalyst particles are attributed to the interaction between the Fe nanoparticles with the surface-modified silica layer. This interaction-mediated growth mechanism is illustrated by studying the electronic, atomic and crystal properties of surface-modified catalysts and MWNTs products by characterization with X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), thermal gravimetric analysis (TGA) and Raman spectra.

Graphical abstract

Keywords

carbon nanotubes; surface modification; growth mechanism

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