物理化学学报 >> 2006, Vol. 22 >> Issue (03): 341-344.doi: 10.3866/PKU.WHXB20060317

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多孔阳极氧化铝模板电化学法去阻挡层的研究

徐国荣; 任凤莲; 司士辉; 易清风   

  1. 中南大学化学化工学院, 长沙 410083; 湖南科技大学化学化工学院, 湖南 湘潭 411201
  • 收稿日期:2005-07-19 修回日期:2005-08-29 发布日期:2006-03-10
  • 通讯作者: 任凤莲 E-mail:renfl@mail.csu.edu.cn

Study on Removal of the Barrier between Al Substrate and Porous Anodic Alumina by Electrochemical Approach

XU Guo-Rong; REN Feng-Lian; SI Shi-Hui; YI Qing-Feng   

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China; College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
  • Received:2005-07-19 Revised:2005-08-29 Published:2006-03-10
  • Contact: REN Feng-Lian E-mail:renfl@mail.csu.edu.cn

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摘要： 提出了一种通过电解去多孔阳极氧化铝(PAA)模板阻挡层的新方法. 用电化学方法研究了去阻挡层的影响因素, 用扫描电镜表征了模板的形貌, 在去阻挡层的PAA模板中化学沉积了普鲁士蓝. 循环伏安测试表明, PAA作阴极在氯化钾溶液中电解一段时间后, 在-0.4 V(vs Ag/AgCl)处出现铝的氧化峰, 普鲁士蓝修饰的PAA电极呈现两对可逆的氧化还原峰. 温度升高、电位降低, 碱生成速率增加, 去阻挡层的时间缩短. 在278 K和－1.8 V时, 电解900 s可去除PAA的阻挡层而不出现扩孔、连孔现象. 通过控制合适的温度、电位和时间, 电解可以去除PAA的阻挡层而不影响模板形貌.

关键词: 多孔阳极氧化铝, 电解, 阻挡层, 电化学, 碱

Abstract: An electrochemical method to remove barrier of porous anodic alumina (PAA) is presented. The barrier of PAA was dissolved by electrolysis in a three-electrode cell with PAA as cathode, Pt as anode and Ag/AgCl as reference electrode in neutral potassium chloride solution. The effects of time, temperature and potential on removal of barrier were investigated. The surface morphologies of the PAA before and after removal of barrier were characterized by SEM. Prussian blue (PB) modified electrode was prepared by a simple electroless deposition in PAA. The electrochemical activity of the Prussian blue modified PAA electrode was investigated by cyclic voltammetry. The results showed that the cyclic voltammogram of PAA exhibited an anodic peak at －0.4 V (vs Ag/AgCl) after electrolyzed for a period of time. The Prussian blue modified PAA electrode exhibited two reversible redox couples resulting from Fe3+/Fe2+ and [Fe(CN)6]3－/[Fe(CN)6]4－ transitions in the film. With temperature rising and potential lowering, the speed to produce alkali in PAA rose and the time required to dissolve barrier reduced. At the same time, higher temperature and lower potential could also cause local excess erosion of template. The proper temperature was below 15 ℃. After electrolyzed for 900 s at －1.8 V(vs Ag/AgCl) and 5 ℃, the barrier of PAA could be removed without broadening diameter of pore. Electrochemical method can remove barrier of PAA easily by controlling proper potential, temperature and time.

Key words: Porous anodic alumina, Electrolysis, Barrier layer, Electrochemistry, Alkali