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

✍ Scribed by Qixiang Wang; Guoqing Ning; Fei Wei; Guohua Luo

• Publisher: Elsevier
• Year: 2003
• Tongue: English
• Weight: 414 KB
• Volume: 1
• Category: Article
• ISSN: 1672-2515
• DOI: 10.1016/s1672-2515(07)60004-9

✦ Synopsis

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.