Vanadium pentoxide (V 2 O 5 ) nanowires decorated with CuO nanoparticles on their surface have been prepared by a facile chemical route. The gas-sensing performance of the CuO/V 2 O 5 nanohybrids has been examined against H 2 S, CO, and NO 2 gases over a range of gas concentrations from 7 to 60 ppm and working temperatures from 100 to 400 C, and compared with that of pristine V 2 O 5 nanowires without the decoration. The CuO/V 2 O 5 nanohybrids exhibit a greatly enhanced sensitivity toward H 2 S gas selectively and are relatively indifferent to CO and NO 2 gases. The gas-sensing response of the nanohybrids increases by nearly 18 times (from 1.84 to 31.86) when tested against 23 ppm of H 2 S gas at 220 C. The nanohybrids remain stable when detecting H 2 S gas for a period of two weeks. This selective enhancement is attributable to the local p-n junction formed at the interface together with the reversible chemical reaction that occurs when CuO is exposed to H 2 S gas at the temperature employed.
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