▎ 摘　　要

NOVELTY - A gas sensor manufacturing method involves preparing a graphene oxide into which a functional group is introduced by nucleophilic substitution by mixing a substituent including a nitrogen-containing functional group and graphene oxide, and forming a graphene oxide coating layer in which the functional group is introduced onto the fiber. USE - Method for manufacturing sensing device for gas sensor (claimed). ADVANTAGE - The device has high sensitivity and a low driving temperature and excellent durability, low operating temperature, and can be prepared in simple and cost effective manner. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a gas sensor (2) a core sheath fibrous structure.