Gas Sensing Properties of Quantum-Sized ZnO Nanoparticles for ${\\hbox {NO}}_{2}$

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