▎ 摘　　要

Graphene quantum dots (GQDs), as a kind of zero-dimensional carbon nano material, not only have excellent properties of graphene, but also have quantum confinement effect and boundary effect. GQDs with different nano-size can be obtained by various preparation methods. The surface of GQDs has abundant functional groups, which can be further functionalized by compounding with other materials to meet the detection requirements of different gases and broaden its application range in gas sensing. In this review, the preparation methods of GQDs and their applications in gas sensing are introduced. In addition, the application prospect and development direction of GQDs in gas sensing are also prospected.