Abstract
Ultra-fast and large-quantity (grams) synthesis of one-dimensional ZnO nanowires has been carried out by a novel microwave-assisted method. High purity Zinc (Zn) metal was used as source material and placed on microwave absorber. The evaporation/oxidation process occurs under exposure to microwave in less than 100 s. Field effect scanning electron microscopy analysis reveals the formation of high aspect-ratio and high density ZnO nanowires with diameter ranging from 70 to 80 nm. Comprehensive structural analysis showed that these ZnO nanowires are single crystal in nature with excellent crystal quality. The gas sensor made of these ZnO nanowires exhibited excellent sensitivity, fast response, and good reproducibility. Furthermore, the method can be extended for the synthesis of other oxide nanowires that will be the building block of future nanoscale devices.
Highlights
Fabrication of nanowires has received remarkable attention as these one dimensional (1D) nanostructures provide an ideal system to investigate the dependence of transportN
We present the hydrogen gas sensing properties of Zinc oxide (ZnO) nanowires prepared by a novel one-step ultra-fast microwave assisted method
Typical FESEM images of the as-synthesized ZnO nanowires are displayed in Fig. 3 at different magnifications
Summary
Keywords ZnO Á Microwave synthesis Á Nanowires Á FESEM Á TEM Á XPES Á H2 gas sensor The naturally high surface-to-volume ratio of quasi 1D ZnO nanowires has made it a contender for chemical and biological sensors. There is a need to develop new generation of metal oxide-based hydrogen gas sensors with improved performance.
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