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

doi:10.1016/j.apsusc.2012.10.020

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

19 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 language	English
Pages (from-to)	125-128
Number of pages	4
Journal	Applied Surface Science
Volume	269
DOIs	https://doi.org/10.1016/j.apsusc.2012.10.020
Publication status	Published - 2013

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A2A01011014 ).

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces, Coatings and Films
Surfaces and Interfaces

Access to Document

10.1016/j.apsusc.2012.10.020

Cite this

@article{7001ec6a365d45bdb70dfebc28e29ca9,

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

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.",

author = "Lee, {Jin Seok} and Ha, {Tae Jung} and Hong, {Min Hee} and Park, {Chang Sun} and Park, {Hyung Ho}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A2A01011014 ).",

year = "2013",

doi = "10.1016/j.apsusc.2012.10.020",

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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 et al.
In: Applied Surface Science, Vol. 269, 2013, p. 125-128.

Research output: Contribution to journal › Article › peer-review

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AU - Ha, Tae Jung

AU - Hong, Min Hee

AU - Park, Chang Sun

AU - Park, Hyung Ho

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A2A01011014 ).

PY - 2013

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