| Summary: | Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu<sub>2</sub>O and rGO, and a p-p-type gas sensor is assembled for NO<sub>2</sub> detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy/Cu<sub>2</sub>O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO/PPy/Cu<sub>2</sub>O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO/PPy/Cu<sub>2</sub>O nanocomposite exhibits a maximum NO<sub>2</sub> response of 42.5% and is capable of detecting NO<sub>2</sub> at a low concentration of 200 ppb. Overall, the as-prepared rGO/PPy/Cu<sub>2</sub>O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO<sub>2</sub> sensing applications.
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