Abstract
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., Cu2O and rGO, and a p-p-type gas sensor is assembled for NO2 detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy/Cu2O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO/PPy/Cu2O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO/PPy/Cu2O nanocomposite exhibits a maximum NO2 response of 42.5% and is capable of detecting NO2 at a low concentration of 200 ppb. Overall, the as-prepared rGO/PPy/Cu2O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO2 sensing applications.
Highlights
NO2, as a major air pollutant, is responsible for acid rain and hazardous to human respiratory tracts
Copper acetate monohydrate was obtained from the Gretel Pharmaceutical Technology
PPy-coated Cu2 O nanowires were prepared by a one-step hydrothermal method [47,48], where copper acetate monohydrate was used as a precursor and pyrrole acted as a reducing and structure-directing agent under weak acidic conditions
Summary
NO2 , as a major air pollutant, is responsible for acid rain and hazardous to human respiratory tracts. The comparison of NO2 sensors, based on reduced graphene oxide (rGO) or Cu2 O composites, reveals that designing and fabricating sensing devices based on binary or ternary components with excellent sensing properties is still a challenge (Table 1) [12,14]. In this work, graphene-polypyrrole-coated copper oxide nanowires ternary components were designed and prepared for room temperature for sensing applications. The as-prepared gas sensors via assembly techniques realize room-temperature sensing. These sensors exhibit a maximum NO2 response of 42.5% and are capable of detecting NO2 at a low concentration of 200 ppb.
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