▎ 摘　　要

NOVELTY - Preparing carbon-based material sensor based on lithium ion doping involves soaking the carbon-based material into the lithium chloride salt solution, and then centrifuging the mixed solution, removing the lithium chloride on the surface of the carbon-based material to obtain the carbon-based material containing lithium chloride crystal, reducing the carbon-based material to obtain the reducing carbon-based material containing lithium chloride crystal, using lithium chloride crystal to the sensitivity of different humidity, manufacturing humidity sensor. USE - Method for preparing carbon-based material sensor based on lithium ion doping used to food processing, pharmacy, electronic industry, precise instrument production. ADVANTAGE - The method enables simplifying manufacturing process, improving sensitivity and application prospect, The reduction-oxidation graphene film humidity sensor doped with lithium chloride crystal has high sensitivity to the humidity and is suitable for the environment with multiple humidity detection.