Abstract
Receptor function of oxide semiconductor gas sensors to oxygen and an oxidizing or reducing gas was extended successfully to include two types of adsorbed oxygen, O - and O 2-. The receptor function relying on O 2- ions is featured by linear dependence of resistance on PO 21/4 (PO 2, partial pressure of oxygen), while that relying O - shows linear dependence on PO 21/2. As a result, the resistance can be brought to a high value at small PO 2 when O 2- ions are formed. The drastic increase of resistance in air under desiccated condition can be accounted for as a result of the formation of O 2- ions which is blocked by water vapor in humid conditions. On the response to an oxidizing gas (NO 2) in air, O 2- ions exert an adverse effect; those increase the gross resistance of the device in air, thus reducing the conventionally defined response to the gas. Those influence on the response to a reducing gas (H 2) in a particular way. Owing to a kinetic reason, O 2- ions are almost distinguished at steady state under exposure to the gas, rendering only O - ions to be responsible for the response to the gas, and thus contributing to amplify the conventionally defined response.
| Original language | English |
|---|---|
| Pages (from-to) | 128-135 |
| Number of pages | 8 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 163 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 1 2012 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry
Cite this
Extension of receptor function theory to include two types of adsorbed oxygen for oxide semiconductor gas sensors. / Yamazoe, Noboru; Suematsu, Koichi; Shimanoe, Kengo.
In: Sensors and Actuators, B: Chemical, Vol. 163, No. 1, 01.03.2012, p. 128-135.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Extension of receptor function theory to include two types of adsorbed oxygen for oxide semiconductor gas sensors
AU - Yamazoe, Noboru
AU - Suematsu, Koichi
AU - Shimanoe, Kengo
PY - 2012/3/1
Y1 - 2012/3/1
N2 - Receptor function of oxide semiconductor gas sensors to oxygen and an oxidizing or reducing gas was extended successfully to include two types of adsorbed oxygen, O - and O 2-. The receptor function relying on O 2- ions is featured by linear dependence of resistance on PO 21/4 (PO 2, partial pressure of oxygen), while that relying O - shows linear dependence on PO 21/2. As a result, the resistance can be brought to a high value at small PO 2 when O 2- ions are formed. The drastic increase of resistance in air under desiccated condition can be accounted for as a result of the formation of O 2- ions which is blocked by water vapor in humid conditions. On the response to an oxidizing gas (NO 2) in air, O 2- ions exert an adverse effect; those increase the gross resistance of the device in air, thus reducing the conventionally defined response to the gas. Those influence on the response to a reducing gas (H 2) in a particular way. Owing to a kinetic reason, O 2- ions are almost distinguished at steady state under exposure to the gas, rendering only O - ions to be responsible for the response to the gas, and thus contributing to amplify the conventionally defined response.
AB - Receptor function of oxide semiconductor gas sensors to oxygen and an oxidizing or reducing gas was extended successfully to include two types of adsorbed oxygen, O - and O 2-. The receptor function relying on O 2- ions is featured by linear dependence of resistance on PO 21/4 (PO 2, partial pressure of oxygen), while that relying O - shows linear dependence on PO 21/2. As a result, the resistance can be brought to a high value at small PO 2 when O 2- ions are formed. The drastic increase of resistance in air under desiccated condition can be accounted for as a result of the formation of O 2- ions which is blocked by water vapor in humid conditions. On the response to an oxidizing gas (NO 2) in air, O 2- ions exert an adverse effect; those increase the gross resistance of the device in air, thus reducing the conventionally defined response to the gas. Those influence on the response to a reducing gas (H 2) in a particular way. Owing to a kinetic reason, O 2- ions are almost distinguished at steady state under exposure to the gas, rendering only O - ions to be responsible for the response to the gas, and thus contributing to amplify the conventionally defined response.
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U2 - 10.1016/j.snb.2012.01.020
DO - 10.1016/j.snb.2012.01.020
M3 - Article
VL - 163
SP - 128
EP - 135
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
IS - 1
ER -