DocumentCode :
1317378
Title :
Gas Sensing Properties of Quantum-Sized ZnO Nanoparticles for 
Author :
Bai, Shouli ; Hu, Jingwei ; Xu, Xiaoyan ; Luo, Ruixian ; Li, Dianqing ; Chen, Aifan ; Liu, Chung Chiun
Author_Institution :
State Key Lab. of Chem. Resource Eng., Beijing Univ. of Chem. Technol., Beijing, China
Volume :
12
Issue :
5
fYear :
2012
fDate :
5/1/2012 12:00:00 AM
Firstpage :
1234
Lastpage :
1238
Abstract :
Quantum-sized ZnO nanoparticles with crystallite size about 6 nm were successfully synthesized by low temperature sol-gel process using tetraethylorthosillicate (TEOS) as capping agent to prohibit the crystallite aggregating and Ostwald ripening as well as accelerate the ZnO crystalline formation. The crystallite size was the smallest under the synthesized condition of pH = 8. The appropriate calcination temperature for as-synthesized quantum-sized ZnO was 400 °C for 1 h. The ZnO sensor exhibited the highest response of 264 to 40 ppm NO2 and the highest selectivity of 8.8 and 13.7 respectively to CO and CH4 at the same gas concentration and operating temperature of 290 °C. The mechanism of TEOS action and gas sensing were also discussed.
Keywords :
II-VI semiconductors; crystallites; gas sensors; nanoparticles; nitrogen compounds; sol-gel processing; wide band gap semiconductors; zinc compounds; NO2; Ostwald ripening; TEOS action mechanism; ZnO; as-synthesized quantum-sized nanoparticle; calcination temperature; capping agent; crystalline formation; crystallite aggregation; crystallite size; gas concentration; gas sensing property; low temperature sol-gel process synthesis; temperature 290 degC; temperature 400 degC; tetraethylorthosillicate action mechanism; time 1 h; Gas detectors; Materials; Nanoparticles; Temperature; Temperature sensors; Zinc oxide; ${hbox {NO}}_{2}$ ; ZnO; quantum size; sensors;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2011.2167507
Filename :
6015524
Link To Document :
