Synthesis of Al Doped ZnO with a Novel Rice Microstructure by Hydrothermal Process and Analysis of their Gas Sensing Properties

Abstract:

Al-doped ZnO (AZO) powers with a novel rice-like morphology have been successfully synthesized through a simple and efficient hydrothermal approach, the products have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy-dispersive X-ray analyzer and transmission electron microscopy (TEM). It showed that all the samples presented an hexagonal wurtzite structure of high crystallinity, and the microstructure was composed of numerous dumbbells. Furthermore, the heater gas sensors were fabricated and an investigation of gas sensing properties has been conducted. The sensors showed good selectivity to ethanol comparing with NH₃, SO₂, CO and HCHO and possible mechanism was discussed. The Sensors based AZO powers exhibited high response values, reproducible response-recovery to ethanol 50-1800 ppm at 332°C.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 724-730
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.724
• Online since: December 2014
• Authors: Zan Li, Wei Qin, Xiao Hong Wu*
• Keywords: Al-Doped ZnO, Gas Sensitivity, Hydrothermal Method, Morphology

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