Importance of the nanograin size on the H2S-sensing properties of ZnO-CuO composite nanofibers

초록

ZnO-CuO composite nanofibers were used for the detection of H<inf>2</inf>S. Various nanograin sizes were obtained by changing the heat treatment duration. The nanograin size greatly influenced the H<inf>2</inf>S-sensing performance of the resulting composites. Composite nanofibers consisting of smaller nanograins showed superior sensing properties compared to the composite nanofibers of larger ones. The mechanism is based on the known transition process from the p-CuO-n-ZnO junction to the metallic-CuS-n-ZnO junction in the presence of H<inf>2</inf>S. This study suggests that the nanograin size needs to be as small as possible to obtain the maximum H<inf>2</inf>S-sensing properties in CuO-n-type oxide (ZnO or SnO<inf>2</inf>) composite nanofibers by controlling the heat treatment condition, such as the duration and temperature. © 2015 Elsevier B.V.

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