Room temperature H2S gas sensor based on rather aligned ZnO nanorods with flower-like structures

Rather vertically aligned ZnO rods with flower-like structures were grown on quartz substrates through vapor phase transport method. X-ray diffraction (XRD) analysis and photoluminescence (PL) measurement were performed to determine crystalline structure and defects, respectively. H2S gas sensing properties of the grown structure were investigated at both room temperature and 250 degrees C for comparison. A remarkable increase in response and selectivity at room temperature compared to 250 degrees C was observed. High response and selectivity to low concentrations of H2S at room temperature as well as good stability make the sensor a promising candidate for practical applications. (C) 2014 Elsevier B.V. All rights reserved.