A selective NH sub(3) gas sensor based on Fe sub(2)O sub(3)-ZnO nanocomposites at room temperature

• Published in: Sensors and actuators. B, Chemical Vol. 114; no. 2; pp. 910 - 915
• Main Authors: Tang, Huixiang, Yan, Mi, Zhang, Hui, Li, Shenzhong, Ma, Xingfa, Wang, Mang, Yang, Deren
• Format: Journal Article
• Language: English
• Published: 01-01-2006
• Subjects: Actuators; Diffraction; Gas sensors; Nanocomposites; Sensors; Sol gel process; Transmission electron microscopy; X-rays
• ISSN: 0925-4005
• DOI: 10.1016/j.snb.2005.08.010

Gas sensors based on the Fe sub(2)O sub(3)-ZnO nanocomposites with different compositions of Fe:Zn was prepared by a sol-gel and spin-coating method. Morphology of the Fe sub(2)O sub(3)-ZnO nanocomposites was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD, D/max-rA) and energy dispersive X-ray analysis (EDX). The results of electrical and sensing measurement indicated that the sensor with Fe:Zn = 2% exhibited fairly excellent sensitivity and selectivity to NH sub(3) at room temperature. The response and recovery time of the sensor were both less than 20 s. Finally, the mechanism for the improvement in the gas sensing properties was discussed.