▎ 摘　　要

NOVELTY - A pH sensitive graphene nano composite material comprises 2,2'-azobis(2-methylpropionamidine) dihydrochloride, which is used to initiate a ring-opening reaction of graphene oxide epoxy bond and initiates polymerization of acrylic acid by radical heat, and covalently copolymerizes polyacrylic acid, where the composite material polyacrylic acid-reduced graphene oxide is prepared by modifying onto a graphene oxide carrier. USE - PH sensitive graphene nano composite material for detecting potassium ferricyanide probes at different pH values (claimed). ADVANTAGE - The pH sensitive graphene nano composite material has excellent electrochemical performance and potential application prospect in intelligent electro-catalysis field. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing a pH sensitive graphene nano composite material, which involves dispersing graphene oxide in distilled water, ultrasonically for 30-40 minutes, adding 2,2'-azobis(2-methylpropionamidine) dihydrochloride, adjusting the pH of the solution to 9-11, reacting at 30-40 degrees C for 2-3 hours, injecting an acrylic acid, hydrothermally reacting, centrifuging, washing and drying to obtain the finished product (2) use of pH sensitive graphene nano composite material for detecting potassium ferricyanide probes at different pH values.