新颖的TiO2@C核壳结构纳米纤维阵列电极制备及其在电化学传感器中的应用

本文提出以金属钛为基底, 在丙酮蒸气和无催化剂条件下, 通过高温反应, 直接在金属钛片上一步合成出具有核壳结构的TiO2@C纳米纤维阵列. 由于TiO2@C纳米纤维阵列在金属钛片上分布均一, 与金属钛基底有良好的结合力和电接触性能, 可直接作为电化学传感器电极. 进一步的电化学检测表明, 该电极对铁氰化钾及多巴胺等物质有良好的电化学响应, 对多巴胺检测灵敏度高, 响应的线性范围为1.0×10-7~1.0×10-4 mol/L, 检测限达2.45×10-8 mol/L. 该电极有望在生物传感、环境分析及药物分析等领域发挥重要作用.

Fabrication of TiO2 @ C Core-shell Nanofiber Arrays Electrode and Its Appdication in Electrochemical Sensing

In this paper we describe a new method to fabricate TiO2@C core-shell nanofiber arrays for electrochemical sensing. The TiO2@C nanofiber arrays have been produced directly on titanium surface under acetone vapor at 800 ℃. This TiO2@C core-shell nanofiber arrays have the 40 nm TiO2 core in diameter and 5—10 nm carbon shell in thickness and show good electrochemical behaviors. The cyclic voltammogram in 1.0×10-3 mol/L K3Fe(CN)6 is quasi-reversible. The amperometric response increases linearly with the increase of the concentration of dopamine in the range of 1.0×10-7—1.0×10-4 mol/L. The detection limit(S/N=3) of dopamine is 2.45×10-8 mol/L.