Thin films composed of multiwalled carbon nanotubes, gold nanoparticles and myoglobin for humidity detection at room temperature

Zhi Mei Qi, Mingdeng Wei, Itaru Honma, Haoshen Zhou

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Optically transparent and electrically conductive nanocomposite thin films consisting of multiwalled carbon nanotubes (MWCNTs), gold nanoparticles (GNPs) and myoglobin molecules that glue GNPs and MWCNTs together are fabricated for the first time on glass substrates from aqueous solution. The nanocomposite thin film is capable of varying its resistance, impedance or optical transmittance at room temperature in response to changes in ambient humidity. The conductometric sensitivity to relative humidity (RH) of the nanocomposite thin film is compared with those of the pure and Mb-functionalized MWCNT layers. The pure MWCNT layer shows a small increase in its resistance with increasing RH due to the effect of p-type semiconducting nanotubes present in the film. In contrast, a four times higher sensitivi-ty to RH is observed for both the nanocomposite and Mb-functionalized MWCNT thin films. The sensitivity enhancement is attributable to swelling of the thin films induced by water absorption in the presence of Mb molecules, which increases the internanotube spacing and thereby causes a further increase of the film resistance. A humidity change as low as ΔRH =03% has been readily detected by conductometry using the nanocomposite thin film.

本文言語English
ページ(範囲)264-269
ページ数6
ジャーナルChemPhysChem
8
2
DOI
出版ステータスPublished - 2007 2月 2
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 物理化学および理論化学

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