Abstract
The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications during the last five decades because ambient humidity dynamically changes with the environmental conditions. Herein, a new and novel strategy is reported to eliminate the humidity dependence of the gas sensing characteristics of oxide chemiresistors via dynamic self-refreshing of the sensing surface affected by water vapor chemisorption. The sensor resistance and gas response of pure In2O3hollow spheres significantly change and deteriorate in humid atmospheres. In contrast, the humidity dependence becomes negligible when an optimal concentration of CeO2nanoclusters is uniformly loaded onto In2O3hollow spheres via layer-by-layer (LBL) assembly. Moreover, In2O3sensors LBL-coated with CeO2nanoclusters show fast response/recovery, low detection limit (500 ppb), and high selectivity to acetone even in highly humid conditions (relative humidity 80%). The mechanism underlying the dynamic refreshing of the In2O3sensing surfaces regardless of humidity variation is investigated in relation to the role of CeO2and the chemical interaction among CeO2, In2O3, and water vapor. This strategy can be widely used to design high performance gas sensors including disease diagnosis via breath analysis and pollutant monitoring.
| Original language | English |
|---|---|
| Pages (from-to) | 4229-4240 |
| Number of pages | 12 |
| Journal | Small |
| DOIs | |
| Publication status | Published - 2016 Aug 17 |
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Keywords
- CeO-InO
- humidity dependence
- layer-by-layer assemblies
- regenerative surfaces
- semiconductor gas sensors
ASJC Scopus subject areas
- Biotechnology
- Biomaterials
- Engineering (miscellaneous)
Cite this
A New Strategy for Humidity Independent Oxide Chemiresistors : Dynamic Self-Refreshing of In2O3Sensing Surface Assisted by Layer-by-Layer Coated CeO2Nanoclusters. / Yoon, Ji Wook; Kim, Jun Sik; Kim, Tae Hyung; Hong, Young Jun; Kang, Yun Chan; Lee, Jong Heun.
In: Small, 17.08.2016, p. 4229-4240.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A New Strategy for Humidity Independent Oxide Chemiresistors
T2 - Dynamic Self-Refreshing of In2O3Sensing Surface Assisted by Layer-by-Layer Coated CeO2Nanoclusters
AU - Yoon, Ji Wook
AU - Kim, Jun Sik
AU - Kim, Tae Hyung
AU - Hong, Young Jun
AU - Kang, Yun Chan
AU - Lee, Jong Heun
PY - 2016/8/17
Y1 - 2016/8/17
N2 - The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications during the last five decades because ambient humidity dynamically changes with the environmental conditions. Herein, a new and novel strategy is reported to eliminate the humidity dependence of the gas sensing characteristics of oxide chemiresistors via dynamic self-refreshing of the sensing surface affected by water vapor chemisorption. The sensor resistance and gas response of pure In2O3hollow spheres significantly change and deteriorate in humid atmospheres. In contrast, the humidity dependence becomes negligible when an optimal concentration of CeO2nanoclusters is uniformly loaded onto In2O3hollow spheres via layer-by-layer (LBL) assembly. Moreover, In2O3sensors LBL-coated with CeO2nanoclusters show fast response/recovery, low detection limit (500 ppb), and high selectivity to acetone even in highly humid conditions (relative humidity 80%). The mechanism underlying the dynamic refreshing of the In2O3sensing surfaces regardless of humidity variation is investigated in relation to the role of CeO2and the chemical interaction among CeO2, In2O3, and water vapor. This strategy can be widely used to design high performance gas sensors including disease diagnosis via breath analysis and pollutant monitoring.
AB - The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications during the last five decades because ambient humidity dynamically changes with the environmental conditions. Herein, a new and novel strategy is reported to eliminate the humidity dependence of the gas sensing characteristics of oxide chemiresistors via dynamic self-refreshing of the sensing surface affected by water vapor chemisorption. The sensor resistance and gas response of pure In2O3hollow spheres significantly change and deteriorate in humid atmospheres. In contrast, the humidity dependence becomes negligible when an optimal concentration of CeO2nanoclusters is uniformly loaded onto In2O3hollow spheres via layer-by-layer (LBL) assembly. Moreover, In2O3sensors LBL-coated with CeO2nanoclusters show fast response/recovery, low detection limit (500 ppb), and high selectivity to acetone even in highly humid conditions (relative humidity 80%). The mechanism underlying the dynamic refreshing of the In2O3sensing surfaces regardless of humidity variation is investigated in relation to the role of CeO2and the chemical interaction among CeO2, In2O3, and water vapor. This strategy can be widely used to design high performance gas sensors including disease diagnosis via breath analysis and pollutant monitoring.
KW - CeO-InO
KW - humidity dependence
KW - layer-by-layer assemblies
KW - regenerative surfaces
KW - semiconductor gas sensors
UR - http://www.scopus.com/inward/record.url?scp=84981532057&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84981532057&partnerID=8YFLogxK
U2 - 10.1002/smll.201601507
DO - 10.1002/smll.201601507
M3 - Article
C2 - 27357165
AN - SCOPUS:84981532057
SP - 4229
EP - 4240
JO - Small
JF - Small
SN - 1613-6810
ER -