▎ 摘　　要

NOVELTY - A pH sensor manufacturing method involves synthesizing a graphene oxide film from a graphene oxide sheet, coating a silver or gold layer on a silicon dioxide/silicon substrate by vacuum coating to obtain electrodes, transferring the synthesized graphene oxide film between electrodes, and naturally drying at room temperature, putting sample into a reaction kettle, evacuating air with nitrogen, and reducing by heat treatment and making a trench along the edge of the reduced graphene oxide film with polymethyl methacrylate to constitute a complete device for detecting the pH value variations. USE - Method for manufacturing pH sensor. ADVANTAGE - The method enables manufacturing pH sensor with high efficiency. DETAILED DESCRIPTION - A pH sensor manufacturing method involves synthesizing a graphene oxide film from a graphene oxide sheet by mixing natural graphite powder with potassium permanganate, sodium nitrate and 98% concentrated sulfuric acid and oxidizing resultant product, coating a silver or gold layer on a silicon dioxide/silicon substrate by vacuum coating to obtain electrodes, transferring the synthesized graphene oxide film between electrodes, and naturally drying in air at room temperature, putting sample into a reaction kettle, evacuating air with nitrogen, and reducing by heat treatment and making a trench along the edge of the reduced graphene oxide film with polymethyl methacrylate or other insulating polymer to constitute a complete device for detecting the pH value variations.