Highly stable and sensitive gas sensor based on single-walled carbon nanotubes protected by metal-oxide coating layer

Wongwiriyapan, Winadda; Inoue, Satoshi; Okabayashi, Yusuke; Ito, Tatsuya; Shimazaki, Ryotaro; Maekawa, Toru; Suzuki, Kengo; Ishikawa, Hiroshi; Honda, Shin Ichi; Mori, Hirotaro; Oura, Kenjiro; Katayama, Mitsuhiro

doi:10.1143/APEX.2.095008

Highly stable and sensitive gas sensor based on single-walled carbon nanotubes protected by metal-oxide coating layer

Author(s)

Wongwiriyapan, Winadda

Inoue, Satoshi

Okabayashi, Yusuke

Ito, Tatsuya

Shimazaki, Ryotaro

Maekawa, Toru

Suzuki, Kengo

Ishikawa, Hiroshi

Honda, Shin Ichi

Mori, Hirotaro

Oura, Kenjiro

Katayama, Mitsuhiro

Date Issued

September 1, 2009

Type

Article

DOI

10.1143/APEX.2.095008

Abstract

We fabricated a highly stable and sensitive gas sensor based on single-walled carbon nanotubes (SWNTs) protected by metal-oxide coating layer. SWNTs were deliberately decorated with 2-5 nm of oxygen-deficient SiO x and AlOx by pulsed laser deposition, followed by annealing under Ar/H2 ambient. Surpassing the as-grown SWNTs, the metal-oxide coated SWNTs showed an excellent sensing stability with a variation of sensor response less than 7-8%. The obtained sensitivity to NO2 was also improved. Moreover, the relationship between NO2 concentration and sensor response can be described by the Frumkin-Temkin isotherm. © 2009 The Japan Society of Applied Physics.

Citation

Applied Physics Express, 2(9), 2009