Three-dimensional graphene and its composite for gas sensors

As a two-dimensional (2D) material, graphene shows excellent advantages in the field of gas sensors due to its inherent large specific surface area and unique electrical properties. However, in the practical application of gas detection, graphene sheet is easy to form irreversible agglomeration and has some limitations such as low sensitivity, long response time and slow recovery speed, which greatly reduce its gas sensing performance. As a gas sensing material, three-dimensional (3D) porous graphene has been extensively studied in recent years owing to its larger specific surface area and stable structure. In order to synthesize graphene with different three-dimensional structures, many methods have been developed. Herein, the synthesis and assembly of three-dimensional graphene and its composites were reviewed, with emphasis on the application of three-dimensional graphene and its composites in the field of gas sensors. The challenges and development prospects of three-dimensional graphene materials in the application of gas sensors were briefly described. Graphic abstract