Microwave-assisted synthesis, characterization and ammonia sensing properties of polymer-capped star-shaped zinc oxide nanostructures
- 428 Downloads
Zinc oxide nanostructures were prepared by microwave-irradiation technique in the presence of polyvinyl pyrrolidone as a shape modifier. The synthesized nanostructures were analyzed using scanning and transmission electron microscopy, selected-area electron diffraction, X-ray diffraction, and Fourier transform infrared spectroscopy (FT-IR). Characterization techniques revealed the formation of crystalline ZnO with a star-like shaped morphology, having the crystal structure of wurtzite. The microwave irradiated samples were further investigated to exploit their electrical and sensing properties. The good sensitivity and relatively short response and recovery times of chemoresistive sensors based on star-like ZnO thick films in the monitoring of low concentration of ammonia gas in air were related to the peculiar nanostructure of the sensing layer.
KeywordsMicrowave synthesis Zinc oxide Semiconductor Ammonia sensor Synthesis Sensors
- Health and Safety Executive (1993) Guidance Note EH40/93, Occupational Exposure Limits 1993. HMSO, LondonGoogle Scholar
- Hyun Seo M, Yuasa M, Kida T, Soo Huh J, Shimanoe K, Yamazoe N (2009) Gas sensing characteristics and porosity control of nanostructured films composed of TiO2 nanotubes. Sens Actuators B 137(2009):513–520Google Scholar
- Lauf RJ, Bond WD (1984) Fabrication of high field zinc oxide varistors by sol–gel processing. Am Ceram Soc Bull 63:278–282Google Scholar