▎ 摘　　要

This paper demonstrated a high-performance hydrogen gas sensor based on CuO-reduced graphene oxide (rGO)-CuO sandwiched nanostructure. The CuO-rGO-CuO nanostructure was examined by scanning electron microscopy, X-ray diffraction and transmission electron microscope. The gas sensing characteristics of the CuO-rGO-CuO film sensor were evaluated at room temperature against hydrogen over a wide concentration range, which are better than that of pristine CuO and rGO. High sensitivity, good repeatability, and response-recovery characteristics were achieved in this work. Furthermore, the possible sensing mechanism of the presented sensor was explored.