Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 176, Issue -, Pages 166-173Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.09.060
Keywords
SnO2-ZnO porous nanosolid; Polyaniline; Composite; NO2; Gas sensitivity
Funding
- National Natural Science Foundation of China (NSFC) [60906008]
- Foundation for Excellent Middle-aged or Young Scientists from Shandong Province [BS2010CL007, BS2012CL003]
- State Key Laboratory of Crystal Material (Shandong University) [KF0808]
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SnO2-ZnO/polyaniline (PANI) composite thick film for NO2 detection was fabricated from SnO2-ZnO porous nanosolid and PANI by a conventional coating method. The SnO2-ZnO composite porous nanosolid was prepared by a solvo-thermal hot-press (SHP) method. It was found that the composite sensor has high selectivity and response to low concentration NO2 gas. Furthermore, the composite sensor also showed high stability to NO2 over a long working period at low optimum working temperature (180 degrees C). The response and recovery times of SnO2/PANI composite sensor (SZ20-P) were as short as about 9 and 27 s to 35 ppm NO2 at 180 degrees C, respectively. The experiment results show that both the pore structures of SnO2 porous nanosolid and the content of ZnO had effects on the sensor response of SnO2-ZnO/PANI composites, and the optimum content of ZnO was 20 wt.%. The possible sensing mechanism was discussed. (C) 2012 Elsevier B.V. All rights reserved.
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