Electrically refreshable carbon-nanotube-based gas sensors

Young Wook Chang; Je Seung Oh; Seung Hwan Yoo; Hyang Hee Choi; Kyung Hwa Yoo

doi:10.1088/0957-4484/18/43/435504

Electrically refreshable carbon-nanotube-based gas sensors

Young Wook Chang, Je Seung Oh, Seung Hwan Yoo, Hyang Hee Choi, Kyung Hwa Yoo

Department of Physics

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

67 Citations (Scopus)

Abstract

We report electrically refreshable carbon-nanotube (CNT)-based gas sensors with a field effect transistor (FET) structure. The sensors can be refreshed by applying a negative gate voltage pulse in NO₂ and a positive gate voltage pulse in NH₃. Furthermore, the temporal response of the conductance to the gate voltage pulse is observed to be dependent on the gas species, but independent of gas concentration. These results show the possibility of distinguishing gas species using CNT-FET sensors.

Original language	English
Article number	435504
Journal	Nanotechnology
Volume	18
Issue number	43
DOIs	https://doi.org/10.1088/0957-4484/18/43/435504
Publication status	Published - 2007 Oct 31

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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AU - Choi, Hyang Hee

AU - Yoo, Kyung Hwa

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AB - We report electrically refreshable carbon-nanotube (CNT)-based gas sensors with a field effect transistor (FET) structure. The sensors can be refreshed by applying a negative gate voltage pulse in NO2 and a positive gate voltage pulse in NH3. Furthermore, the temporal response of the conductance to the gate voltage pulse is observed to be dependent on the gas species, but independent of gas concentration. These results show the possibility of distinguishing gas species using CNT-FET sensors.

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Electrically refreshable carbon-nanotube-based gas sensors

Abstract

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