▎ 摘　　要

NOVELTY - Preparation of composite material involves polymerizing graphene and ionic liquid in presence of free radical initiator under inert gas atmosphere, washing resultant product and drying. USE - Preparation of composite material used for electrochemical sensor for detecting phenethanolamine (all claimed). ADVANTAGE - The method provides composite material having excellent conductivity and recyclability, and high porosity, absorption property, sensitivity and stability, by simple and economical process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for electrochemical sensor, which comprises working electrode coated with composite material.