Growth of vertically aligned single-walled carbon nanotube films on quartz substrates and their optical anisotropy

• DOI: 10.1016/j.cplett.2003.12.095
• Publication Date: 2004-01-23T05:18:16Z
• Authors: Yoichi Murakami; Shohei Chiashi; Yuhei Miyauchi; Minghui Hu; Masaru Ogura; Tatsuya Okubo; Shigeo Maruyama
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract Films of vertically aligned single-walled carbon nanotubes (SWNTs) with a few micrometer thickness were grown by catalytic chemical vapor deposition (CVD) on quartz substrates. Low-temperature CVD from ethanol was performed by using densely mono-dispersed Co–Mo catalyst of ≈1.0–2.0 nm prepared on quartz substrates by a dip-coating method. Continuous reduction of catalysts with Ar/H 2 (3% H 2 ) during CVD was essential for generating dense enough SWNTs with vertical alignment. Vertical alignment was clearly demonstrated by anisotropic optical absorption and transmission characteristics in addition to observations by FE-SEM, TEM and resonance Raman scattering.