脈衝陽極處理形成二氧化鈦奈米管之研究

A study of pulse technique to the fabrication of ATO nanaotubes

簡成璋(Cheng-Chang Chien)

指導教授 ： 薛文景

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2009年)

摘要

本研究主要在利用電化學交流阻抗分析法，對二氧化鈦奈米管進行結構上之分析。首先利用電解拋光將試片達到一致的粗糙度，再以金屬鈦(99.5%)試片為陽極，鉑片(99.9%)為陰極，於0.5 wt%氟化銨(Ammonium Fluoride)及99.5 wt%乙二醇(Ethylene glycol)電解液中，以恆電位陽極處理法，製備二氧化鈦奈米管。藉由改變不同的參數，如時間、電壓等鈦試片觀察對於結構的影響。在改變單一參數下，時間增長、電壓升高均與奈米管的成長速率成正比。
本實驗成功以NH4F 0.5%+ EG 99.5%混合的電解液，在持溫5℃，固定電位60V下進行陽極處理，反應時間6小時後，可得陣列二氧化鈦奈米管狀薄膜。並以脈衝陽極處理的方式，製備二氧化鈦奈米管，與恆電位陽極處理法比較，經由交流阻抗分析法的分析，結果可發現脈衝陽極處理法的二氧化鈦奈米管，其抗腐蝕性並不如恆電位陽極處理法，但由圖可發現其奈米管結構有較大的改變。

關鍵字

電化學交流阻抗分析法 ； 二氧化鈦奈米管 ； 脈衝

並列摘要

This study recorded the data of Electrochemical Impedance Spectroscopy (EIS) for ATO (anodic titanium oxide) nanotubes formed on the surfaces of titanium substrates. It has been an increasing demand in brightened and polished surfaces of titanium products with complex shape. TiO2 nanotubes are manufasture by anodization with electrolyte of mixture of ethylene glycol(EG), ammonium fluoride(NH4F), titanium as anode and platinum as cathode. Effect of growth parameters such as,time ,voltage on the formation of titanium oxide structures were studied.It was found that, the growth rate increase to with an increase in time and voltage.
The TiO2 nanotubes are successfully obtain through the anodization with the electrolyte of the mixture of NH4F 0.5 wt%+ EG 99.5 wt% at constant temperature of 5 ℃,constant voltage 60V for 6 h. And TiO2 nanotubes are manufasture by pulse anodization. Charge transfer and mass transport in the anodizing process are observed through electrochemical impedance spectroscopy (EIS) method in 3.5 wt% sodium chloride (NaCl) solution. The impedance spectra over the Bode and Nyquist diagrams are successfully modeled on the electric equivalent circuit.

並列關鍵字

Electrochemical Impedance Spectroscopy ； anodic titanium oxide nanotubes ； pulse.

參考文獻

[1] William F. Smith，Structure and Properties of Engineering Alloys，McGraw-Hill,Inc.，1993，pp.433-434

[2] Santos Jr., E., Kuromoto, N.K., Soares, G.A.，”Mechanical properties of titania films used as biomaterials“，Materials Chemistry and Physics 102 (1), pp. 92-97

[5] M. Adachi, Y. Murata, M. Harada and Y. Yoshikawa, "Formation of titania nanotubes with high photo-catalytic activity," Chemistry Letters, vol. 29, no. 8, 2000, pp. 942-943.

[6] S. Z. Chu, S. Inoue, K. Wada, D. Li, H. Haneda and S. Awatsu, "Highly porous (TiO2-SiO2-TeO2)/Al2O3/Ti O2 composite nanostructures on glass with enhanced photocatalysis fabricated by anodization and sol-gel process," Journal of Physical Chemistry B, vol. 107, no. 8, 2003, pp. 6586-6589.

[7] G. Dagan and M. Tomkiewicz, "TiO2 aerogels for photocatalytic decontamination of aquatic environments," Journal of Physical Chemistry, vol. 97, no. 49, 1993, pp. 12651-12655.