▎ 摘　　要

Amperometric glucose biosensors based on TiO2 nanotube arrays (TiO2 NTAs) modified with graphene and Pt nanoparticles (Pt/Gr/TiO2NTAs) were prepared. The morphology, component and electrochemical property of Pt/Gr/TiO2 NTAs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and amperometry. The distinct functions of graphene and Pt nanoparticles on promoting electrochemical performance were discussed in detail by comparing the cyclic voltammograms of TiO2, Gr/TiO2, Pt/TiO2 and GOx/Pt/Gr/TiO2 NTAs in different conditions. Glucose oxidase (GOx) was fixed on Pt/Gr/TiO2 NTAs by physical adsorption, and GOx/Pt/Gr/TiO2 NTAs biosensor was achieved. The amperometric response of glucose on GOx/Pt/Gr/TiO2 NTAs electrode is linearly proportion to glucose concentration in a range of 0.1 to 8 mM, and a sensitivity of 0.94 mu A . mM(-1) cm(-2) is achieved. (C) 2013 The Electrochemical Society.