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Ar&H2 plasma treatment was proposed to enhance the response of a p-CuAlO2 sensor toward volatile organic compounds. Comprehensive defect characterization studies indicate a substantial increase of surface unsaturated oxygen vacancy (VO) defects via plasma treatment, which could provide active sites for molecule adsorption and the subsequent interfacial redox reaction.

Graphical abstract: Surface oxygen vacancy defect engineering of p-CuAlO2via Ar&H2 plasma treatment for enhancing VOCs sensing performances

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