▎ 摘　　要

A facile solvothermal method has been employed to fabricate ZnCo zeolite imidazolate framework (ZIF) nanoparticles intercalated graphene nanosheet (ZnCo-ZIF/GN), in which ZnCo-ZIF nanoparticles are uniformly distributed. The optimized ZnCo-ZIF/GN-120 sensor has a highly sensitive response of 54.61 for 100 ppm of NO2, and the detection limit reaches 10 ppb at room temperature (rt, 22 degrees C; relative humidity, 30%). The ZnCo-ZIF/GN-120 sensor is shown to have good selectivity, excellent stability, and repeatability for NO2 detection. The facile fabrications of the composites of ZnCo-ZIF nanoparticles and highly conductive GNs pave the way for developing advanced high-performance NO2 sensors.