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Abstract External and internal heterojunctions of reduced graphene oxide (rGO) and ZnO nanofibers (NFs) are developed for ultrasensitive H2S sensing. The gas response of both heterojunctions is significantly higher than… Click to show full abstract
Abstract External and internal heterojunctions of reduced graphene oxide (rGO) and ZnO nanofibers (NFs) are developed for ultrasensitive H2S sensing. The gas response of both heterojunctions is significantly higher than that of bare ZnO NFs. The internal heterojunction of 0.1 wt.% rGO/ZnO NFs exhibited the highest gas response, reaching 1353 to 1 ppm H2S at 350 oC and increasing up to 25-fold, compared to bare ZnO NFs. Whereas response of the former to 1000 ppm H2, 1000 ppm NH3, and 1 ppm SO2 gases is negligible (1.5 to 9). Moreover, the present sensor exhibits an ultralow detection limit of 4.9 ppt and excellent stability towards H2S. A novel sulfuration-desulfuration sensing mechanism is proposed to explain the high response and selectivity to H2S.
Journal Title: Journal of Alloys and Compounds
Year Published: 2021
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