Copper oxide/reduced graphene oxide/graphene composite structure for the chemiresistive detection of acetaldehyde at room temperature

Abstract

In this work, the acetaldehyde (CH3CHO) sensing performance of Copper(II) oxide nanoparticles/reduced Graphite oxide/Graphene composite structure (CuO NPs/rGO/G) was systematically studied. Firstly, CuO NPs/rGO composite nanostructures were prepared by hydrothermal synthesis, Then, CuO NPs/rGO was uniformly deposited on graphene film to prepare CuO NPs/rGO/G composite structure. CH3CHO sensing tests have shown that the CuO NPs/rGO/G composite structure exhibits a fast and highly sensitive response to CH3CHO at room temperature. At the test concentration of 100 ppm CH3CHO, the response of CuO NPs/rGO/G composite structure is 39.94 times that of graphene, 11.37 times that of CuO NPs/rGO, and 5.90 times that of CuO NPs, up to 82.67 %. The response time is only 22 seconds, the recovery time is 159 seconds, and its theoretical limit of detection is 95.10 ppb. In addition, the CuO NPs/rGO/G composite structure has excellent selectivity, repeatability, and long-term stability for the sensing of CH3CHO. The CuO NPs/rGO/G composite structure studied in this paper solves the problems of poor response, slow response, slow desorption and even inability to desorption of graphene in CH3CHO sensing, and has great application potential in respiratory VOCs detection, environmental harmful gas detection, etc.