The effect of multiwalled carbon nanotube doping on the CO gas sensitivity of TiO 2 xerogel composite film

Jin Seok Lee, Tae Jung Ha, Min Hee Hong, Chang Sun Park, Hyung-Ho Park

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A simple sol-gel method was applied for the synthesis of 0.01 wt% multiwalled carbon nanotubes (MWCNTs)-doped TiO 2 xerogel composite film. The film's CO gas sensing properties were then evaluated. Doped MWCNTs were coated with TiO 2 and distributed on a TiO 2 xerogel matrix. The TiO 2 xerogel showed an anatase structure after heat treatment at 450 °C under vacuum. The specific surface area of the composite material was larger than the pure TiO 2 xerogel material. The CO gas sensitivity of the MWCNTs(0.01 wt%)-doped TiO 2 xerogel composite film was found to be seven times higher than that of pure TiO 2 xerogel film and to have good stability. This higher gas-sensing property of the composite film was due to both an increase of specific surface area and the n-p junction structure of the TiO 2 xerogel coated on MWCNTs. The electrons generated from TiO 2 after adsorption of CO gas induces electron transfer from the TiO 2 to the MWCNTs. This induces a characteristic change in the MWCNTs from p-type to n-type, and the resistance of MWCNTs-doped TiO 2 xerogel composite sensor is therefore decreased.

Original languageEnglish
Pages (from-to)125-128
Number of pages4
JournalApplied Surface Science
Volume269
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Xerogels
Multiwalled carbon nanotubes (MWCN)
Composite films
Carbon Monoxide
Gases
Doping (additives)
Specific surface area
Electron gas
Composite materials
Titanium dioxide
Sol-gel process
Heat treatment
Vacuum
Adsorption
Electrons
Sensors

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

Lee, Jin Seok ; Ha, Tae Jung ; Hong, Min Hee ; Park, Chang Sun ; Park, Hyung-Ho. / The effect of multiwalled carbon nanotube doping on the CO gas sensitivity of TiO 2 xerogel composite film In: Applied Surface Science. 2013 ; Vol. 269. pp. 125-128.
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The effect of multiwalled carbon nanotube doping on the CO gas sensitivity of TiO 2 xerogel composite film . / Lee, Jin Seok; Ha, Tae Jung; Hong, Min Hee; Park, Chang Sun; Park, Hyung-Ho.

In: Applied Surface Science, Vol. 269, 01.01.2013, p. 125-128.

Research output: Contribution to journalArticle

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