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(a) SWF changes of In2O2, SnO2 and ZnO (nanowires) with 70 ppm NO2 flow. The gas was switched on and off for 2 cycles. (b) and (c) are the scanning electron micrographs of In2O3 and SnO2 thin films respectively. (d) 5mm×7mm optical image of clusters of ZnO nanowires spread over silicon substrate.
