▎ 摘　　要

NOVELTY - A gas sensor comprises functionalized two-dimensional nanosheets of graphene quantum dot and/or transition metal chalcogenide quantum dot, and comprising fluorinated 1-6C alcohol, fluorinated aryl group, aryl group substituted by fluorinated 1-6C alkyl or fluorinated 1-6C aryl optionally substituted by alcohol. USE - Gas sensor is used for sensing nerve agent e.g. tabun, sarin, soman, VX, dimethyl methylphosphonate and diisopropyl methylphosphonate (all claimed). ADVANTAGE - The gas sensor has excellent optical characteristics, and enables sensing of nerve agent with high detection limit even in high-temperature high-humidity environment.