Beilstein J. Nanotechnol.2014,5, 1836–1841, doi:10.3762/bjnano.5.194
temperatures. In this study, ZnSenanowires were synthesized by the thermal evaporation of ZnSe powders and the sensing performance of multiple-networked ZnSe nanowire sensors toward NO2 gas was examined. The results showed that ZnSe might be a promising gas sensor material if it is used at room temperature
. The response of the ZnSenanowires to 50 ppb–5 ppm NO2 at room temperature under dark and UV illumination conditions were 101–102% and 113–234%, respectively. The responses of the ZnSenanowires to 5 ppm NO2 increased from 102 to 234% with increasing UV illumination intensity from 0 to 1.2 mW/cm2. The
response of the ZnSenanowires was stronger than or comparable to that of typical metal oxide semiconductors reported in the literature, which require higher NO2 concentrations and operate at higher temperatures. The origin of the enhanced response of the ZnSenanowires towards NO2 under UV illumination is
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Figure 1:
(a) SEM image of ZnSe nanowires. (b) XRD pattern of the ZnSe nanowires.