METHOD OF PREPARING COMPOSITE FILMS HAVING POLY(DOPAMINE) TREATED GRAPHENE OXIDE-POLY(VINYLALCOHOL) AND HUMIDITY SENSING METHOD USING THE SAME

摘要

Provided are a method for preparing a polydopamine-treated graphene oxide-polyvinyl alcohol composite film, and a humidity measuring method using the prepared polydopamine-treated graphene oxide-polyvinyl alcohol composite film. The method for preparing a polydopamine-treated graphene oxide-polyvinyl alcohol composite film, according to the present invention, comprises the following steps: preparing a graphene oxide by adding an organic solvent and an oxidizer to graphene; preparing a graphene oxide suspension by adding distilled water to the prepared graphene oxide; preparing a polydopamine-treated graphene oxide by mixing a dopamine supply source with the graphene oxide suspension; preparing a mixed solution by dissolving polyvinyl alcohol in distilled water and mixing the polydopamine-treated graphene oxide with the dissolved solution; and forming a film by applying the mixed solution and drying the same. The polydopamine-treated graphene oxide serves as a moisture barrier so that PVA dissolves in water, and thus the polydopamine-treated graphene oxide-polyvinyl alcohol composite film can be used as a very effective moisture sensor.