Heterojunction gas sensors for environmental NO2 and CO2 monitoring

Z. Ling; C. Leach; R. Freer

doi:10.1016/S0955-2219(01)00154-6

Heterojunction gas sensors for environmental NO2 and CO2 monitoring

Z. Ling, C. Leach, R. Freer

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

Abstract

The NO2 and CO2 sensing properties of a heterojunction gas sensor formed between n-type ZnO and a p-type composite based on a mixture of BaTiO3/CuO/La2O3 have been evaluated and compared with the performance of its component p- and n-type materials. It was found that the individual ZnO and BaTiO3/CuO/La2O3 sensors showed resistance increases when exposed to NO2. When exposed to CO2, the ZnO based sensor showed no response, while the BaTiO3/CuO/La2O3 sensor showed a small resistance increase. The heterojunction sensor was found to be insensitive to <3000 ppm CO2 although at higher concentrations it showed a small decrease in resistance. The resistance also decreased when exposed to low levels of NO2, indicating that a different detection mechanism was operative at the heterocontact compared with the single-phase materials. © 2001 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	1977-1980
Number of pages	3
Journal	Journal of the European Ceramic Society
Volume	21
Issue number	10-11
DOIs	https://doi.org/10.1016/S0955-2219(01)00154-6
Publication status	Published - 2001

Keywords

BaTiO3 and titanates
Electrical properties
Interfaces
ZnO

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10.1016/S0955-2219(01)00154-6

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title = "Heterojunction gas sensors for environmental NO2 and CO2 monitoring",

abstract = "The NO2 and CO2 sensing properties of a heterojunction gas sensor formed between n-type ZnO and a p-type composite based on a mixture of BaTiO3/CuO/La2O3 have been evaluated and compared with the performance of its component p- and n-type materials. It was found that the individual ZnO and BaTiO3/CuO/La2O3 sensors showed resistance increases when exposed to NO2. When exposed to CO2, the ZnO based sensor showed no response, while the BaTiO3/CuO/La2O3 sensor showed a small resistance increase. The heterojunction sensor was found to be insensitive to <3000 ppm CO2 although at higher concentrations it showed a small decrease in resistance. The resistance also decreased when exposed to low levels of NO2, indicating that a different detection mechanism was operative at the heterocontact compared with the single-phase materials. {\textcopyright} 2001 Elsevier Science Ltd. All rights reserved.",

keywords = "BaTiO3 and titanates, Electrical properties, Interfaces, ZnO",

author = "Z. Ling and C. Leach and R. Freer",

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doi = "10.1016/S0955-2219(01)00154-6",

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TY - JOUR

T1 - Heterojunction gas sensors for environmental NO2 and CO2 monitoring

AU - Ling, Z.

AU - Leach, C.

AU - Freer, R.

PY - 2001

Y1 - 2001

N2 - The NO2 and CO2 sensing properties of a heterojunction gas sensor formed between n-type ZnO and a p-type composite based on a mixture of BaTiO3/CuO/La2O3 have been evaluated and compared with the performance of its component p- and n-type materials. It was found that the individual ZnO and BaTiO3/CuO/La2O3 sensors showed resistance increases when exposed to NO2. When exposed to CO2, the ZnO based sensor showed no response, while the BaTiO3/CuO/La2O3 sensor showed a small resistance increase. The heterojunction sensor was found to be insensitive to <3000 ppm CO2 although at higher concentrations it showed a small decrease in resistance. The resistance also decreased when exposed to low levels of NO2, indicating that a different detection mechanism was operative at the heterocontact compared with the single-phase materials. © 2001 Elsevier Science Ltd. All rights reserved.

AB - The NO2 and CO2 sensing properties of a heterojunction gas sensor formed between n-type ZnO and a p-type composite based on a mixture of BaTiO3/CuO/La2O3 have been evaluated and compared with the performance of its component p- and n-type materials. It was found that the individual ZnO and BaTiO3/CuO/La2O3 sensors showed resistance increases when exposed to NO2. When exposed to CO2, the ZnO based sensor showed no response, while the BaTiO3/CuO/La2O3 sensor showed a small resistance increase. The heterojunction sensor was found to be insensitive to <3000 ppm CO2 although at higher concentrations it showed a small decrease in resistance. The resistance also decreased when exposed to low levels of NO2, indicating that a different detection mechanism was operative at the heterocontact compared with the single-phase materials. © 2001 Elsevier Science Ltd. All rights reserved.

KW - BaTiO3 and titanates

KW - Electrical properties

KW - Interfaces

KW - ZnO

U2 - 10.1016/S0955-2219(01)00154-6

DO - 10.1016/S0955-2219(01)00154-6

M3 - Article

SN - 0955-2219

VL - 21

SP - 1977

EP - 1980

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 10-11

ER -

Heterojunction gas sensors for environmental NO2 and CO2 monitoring

Abstract

Keywords

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