▎ 摘　　要

NOVELTY - A glucose sensor has graphene fiber filled with glucose oxidase as a working electrode, where the glucose oxidase is filled and fixed inside a graphene fiber, and the glucose sensor comprises two-electrode glucose sensor or a three-electrode glucose sensor. USE - Glucose sensor. ADVANTAGE - The glucose sensor has high sensitivity and better repeatability, and has great application potential in the field of flexible and wearable devices. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method of preparing a glucose sensor, which involves growing graphene on the surface of the copper wire substrate by chemical vapor deposition to obtain a copper wire having graphene grown on the surface, placing a copper wire having graphene grown on the surface in an etching solution, and etching the copper wire substrate to obtain a continuous hollow graphene tube, transferring the hollow graphene tube to deionized water until the pH is neutral, soaking in the phosphate buffer solution of glucose oxidase, using the tweezers to fill the hollow graphene of the phosphate buffer solution filled with glucose oxidase, pulling out the tube from the phosphate buffer solution of glucose oxidase to obtain a working electrode, combining the working electrode with the graphene composite fiber of the modified platinum nanoparticle to form a two-electrode glucose sensor, or the working electrode together with the platinum wire electrode and saturated calomel electrode constitute a three-electrode glucose sensor.