▎ 摘　　要

NOVELTY - A nanohydroxyl apatite/graphene gas sensing material is prepared by: reducing and modifying graphene oxide, dissolving into mix solution of mussel adhesive protein analogs and tris(hydroxymethyl)aminomethane hydrochloride, magnetically stirring, separating solids, washing, and vacuum drying; and dispersing into calcium ion solution, controlling concentration, adding phosphate solution, regulating pH using pH regulator, reacting, magnetically stirring, standing, separating, washing, and vacuum drying. USE - Method for preparing nanohydroxyl apatite/graphene gas sensing material (claimed). ADVANTAGE - The material has excellent sensitivity and circulation stability. The method has simple process and low cost. DETAILED DESCRIPTION - A nanohydroxyl apatite/graphene gas sensing material is prepared by: reducing and modifying 0.2-2 mg/ml graphene oxide for 1-6 hours at power of 40-120 kHz, dissolving into mix solution of 10 mM mussel adhesive protein analogs and tris(hydroxymethyl)aminomethane hydrochloride, magnetically stirring for 0.5-16 hours, separating solids, washing, and vacuum drying at 60-80 degrees C for 12-24 hours; and dispersing into 0.05-0.5 mol/L calcium ion solution, controlling concentration to 0.2-2 mg/ml, adding 0.03-3 mol/l phosphate solution, regulating pH using pH regulator to 9-13, reacting to 15-80 degrees C, magnetically stirring for 2-4 hours, standing for 12-48 hours, separating, washing, and vacuum drying at 60-80 degrees C for 12-24 hours. An INDEPENDENT CLAIM is included for gas sensor.