物理化学学报 >> 2012, Vol. 28 >> Issue (11): 26482648-2658..doi: 10.3866/PKU.WHXB201208151

电化学和新能源 上一篇    下一篇

还原剂对多孔阳极氧化铝纳米孔道结构的影响

朱绪飞1, 韩华2, 马宏图2, 路超1, 戚卫星1, 徐晨1   

  1. 1 南京理工大学软化学与功能材料教育部重点实验室, 南京 210094;
    2 中国科学院自动化研究所, 国家专用集成电路设计工程技术研究中心, 北京 100190
  • 收稿日期:2012-05-28 修回日期:2012-08-10 发布日期:2012-10-17
  • 通讯作者: 朱绪飞, 韩华 E-mail:zhuxufei.njust@gmail.com; hua.han@ia.ac.cn
  • 基金资助:

    国家自然科学基金(61171043, 51077072)和国家科技重大专项资金(2009ZX01021-002)资助项目

Influence of Reducer on the Nanopore Structure of Porous Anodic Alumina

ZHU Xu-Fei1, HAN Hua2, MA Hong-Tu2, LU Chao1, QI Wei-Xing1, XU Chen1   

  1. 1 Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science & Technology, Nanjing 210094, P. R. China;
    2 The National Engineering and Technology Research Center for ASIC Design, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2012-05-28 Revised:2012-08-10 Published:2012-10-17
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61171043, 51077072) and National Science and Technology Major Project of the Ministry of Science and Technology of China (2009ZX01021-002).

摘要:

多孔阳极氧化铝(PAA)和多孔阳极氧化钛纳米管(PATNT)的结构调控近年来倍受关注. 在形成机理尚不清楚的情况下, 对PAA和PATNT的结构调控很难避免盲目性. 为验证“氧气气泡模具”可以形成纳米孔道这个新观点, 本文采用化学方法对PAA的结构进行调控, 成功地引入了一种还原剂来吸收纳米孔道中的氧气气泡. 在添加还原剂的草酸溶液中得到了一种特殊的阳极氧化铝膜. 研究了还原剂的含量对磷酸溶液中形成PAA孔道结构的影响, 结果表明随着还原剂含量的增加, PAA的孔道直径逐渐减小, 有序性降低. 对比了添加还原剂前后阳极氧化过程的电压-时间曲线的差异, 结果表明, 在含有还原剂溶液中制备的阳极氧化铝膜的导电性明显提高. 在密封的条件下, 还原剂能吸收掉孔道中的氧气, 使气泡模具效应消失, 得到完全的致密型氧化膜. 这些实验事实充分证明PAA中有序孔道的形成是氧气气泡模具效应的结果.

关键词: 纳米多孔材料, 阳极氧化, 电解液, 还原剂, 形成机理

Abstract:

In recent years, attention has been focused on adjustment and control of the nanostructures of porous anodic alumina (PAA) and porous anodic TiO2 nanotubes (PATNT). Because the formation mechanism of PAA and PATNT is still unclear, it is difficult to adjust the nanostructures of PAA and PATNT. To validate the novel viewpoint of the nanopore resulting from an oxygen bubble mold, an innovative chemical approach was used to adjust the PAA nanostructures. One successful approach is to use a reducer to absorb the oxygen bubbles in the nanopores. A novel anodic alumina film was obtained in a mixed solution of the reducer and oxalic acid. The influence of the reducer on the PAA nanostructures which formed in H3PO4 solution was investigated in detail. The experimental results showed that the regularity and the diameters of the nanopores in the PAA decreased as the reducer content increased. The differences in the voltage-time curves between electrolytes with and without the reducer were analyzed quantitatively. The results showed that the conductivity of the anodic oxide film that formed in the electrolyte with the reducer was better than that in the electrolyte without the reducer. When aluminum anodizes in a sealed case, oxygen bubbles are easily absorbed by the reducer, the oxygen bubble mold effect disappears, and a compact alumina film is obtained. Overall, these results clearly demonstrate that nanopores result from the oxygen bubble mold effect.

Key words: Nanoporous material, Anodization, Electrolyte, Reducer, Formation mechanism

MSC2000: 

  • O646