▎ 摘　　要

NOVELTY - The method involves providing a substrate. A combined buffer layer (23) is prepared on the substrate. The buffer layer is composed of a simple stack graphene buffer layer and an organic flexible insulating layer. A sensitive material layer (4) is prepared on a top portion of the organic flexible insulation layer. A source electrode (5) and a drain electrode (6) formed on the sensitive material layer by optimizing an oxidation degree of the sensitive layer to increase sensitivity of a gas sensor. Post-treatment is performed for the gas sensor. USE - Method for preparing a gas sensor used for detecting benzene gas. ADVANTAGE - The method enables preparing the gas sensor that has strong bending resistance and sensitivity by optimizing the degree of oxidation of the layer of sensitive material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a gas sensor. 1Ultraviolet ozone 2Graphene buffer layer 3Flexible buffer layer 4Sensitive material layer 5Source electrode 6Drain electrode 23Combined buffer layer