Preparation And Electrochemical Biosensing Study On Titanate Nanobelts And Its Composites

The biosensor based on enzyme electrochemicstry that showed the properties of high sensitivity, well selectivity and fast response has become a research hotspot. Nanomaterial was extensively used on electrochemistry due to its particular charactiritics such as large specific surface, well catalytic efficiency and high adsorptive capacity. Recently, titanate nanomaterials, which possess biocompatibility, chemical and thermal stability, as well as good mechanical strength, had already attracted broad attention by electrochemical researchers. But titanate nanomaterials were adverse to application on account of relatively poor conductivity.We modified titanate nanobelts (TNBs) were prepared according to the hydrothermal method, and use them prepared enzyme biosensors. Then used UV-vis, FT-IR, XRD, TEM to character their morphologies and structures. At last, used cyclic voltammetry and chronoamperometry to test the electrochemicstry of modified electrodes,the results showed that chemical structure was NaxH2-xTi3O7, length was 100-200 nm, width was 50-70 nm, and smooth. Au nanoparticles were grain size was uniform and well-distributed, diameter was 5-7 nm. Ag nanoparticles were well-distributed on TNBs surface, and the diameter was 3-5 nm.The electrochemical results showed that TNBs offered a pathway for direct electron transfer between the electrode surface and the active redox center of glucose oxidase(GOx). The conductivity of modified TNBs was better than TNBs, and the more GOx was loaded on modified TNBs surface. Therefore, the electrochemical behaviors of modified TNBs electrode was better. The Au nanoparticles-modified TNBs modified showed the well electrochemical behaviors. GOx showed the best reduction current on Ag nanoparticles-doped TNBs, and its modified electrode electrochemical property were directly proportional to the AgNPs density. The three GOx modified electrodes all quickly response to glucose.