Highly sensitive NO^sub 2^ detection on ppb level by devices based on Pd-loaded In^sub 2^O^sub 3^ hierarchical microstructures

The special flower-like Pd-loaded indium oxide (In2O3) hierarchical microstructures with different Pd contents were successfully synthesized by a hydrothermal method, showing the features dimension of 5–7 μm diameter and 30 nm thick nanosheets. Developed NO2 sensors based on 1 mol% Pd-loaded In2O3 h...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. B252; p. 116
Main Authors Hu, Jie, Liang, Yanfei, Sun, Yongjiao, Zhao, Zhenting, Zhang, Meng, Li, Pengwei, Zhang, Wendong, Chen, Yong, Zhuiykov, Serge
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier Science Ltd 01.11.2017
Subjects
Chemicals
Chemistry
Ethanol
Gas sensors
Indium oxides
Microstructure
Nitrogen dioxide
Operating temperature
Organic chemistry
Sensors
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Summary:The special flower-like Pd-loaded indium oxide (In2O3) hierarchical microstructures with different Pd contents were successfully synthesized by a hydrothermal method, showing the features dimension of 5–7 μm diameter and 30 nm thick nanosheets. Developed NO2 sensors based on 1 mol% Pd-loaded In2O3 hierarchical microstructures demonstrated excellent NO2 detection at the ppb levels at lower operating temperature of 110 °C. These sensors also exhibited high response, fast response (180 s) and recovery (90 s) time and great reliability as well as simplicity in fabrication. Furthermore, selective detection of NO2 can be readily achieved with sensors attached with 1 mol% Pd-loaded In2O3 even with other common chemicals such as ethanol, CO, CH4 and H2 around. The electron depletion theory was used to explain the enhanced gas sensing mechanism.
ISSN:0925-4005
1873-3077