▎ 摘　　要

NOVELTY - A nano-vanadium nitride/graphene composite paste electrode sensor preparing method involves adding 70-75% deionized water and 8-12% concentrated sulfuric acid, mixing well and cooling to room temperature, adding 15-20% graphene oxide and the sum of the components is 100%, soaking at room temperature for 15-18 hours, solid-liquid separation, washing with deionized water without sulfate, drying, grinding to powder and pretreating graphene oxide, adding 42-45% nano-vanadium nitride, 20-25% pre-treated graphene oxide, 12-18% N-ethyl-3-methylpyridine hexafluorophosphate, 8-12% liquid paraffin, 6-10% petroleum ether and the sum of the components is 100% and the grinding is uniform to obtain the nano-vanadium nitride/graphene/N-ethyl-3-methylpyridine hexafluorophosphate mixture carbon paste, placing carbon paste in a glass tube, compacting, drying, polishing with metallographic sandpaper, polishing, and washing with deionized water to obtain the finished product. USE - Method for preparing nano-vanadium nitride/graphene composite paste electrode sensor. ADVANTAGE - The method enables preparing nano-vanadium nitride/graphene composite paste electrode sensor with high sensitivity and better selectivity, in simple and cost effective manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a nano-vanadium nitride/graphene composite paste electrode sensor is prepared by the method.