Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (17): 1812-1816. Previous Articles     Next Articles

Original Articles

扫描电化学显微镜沉积六氰合铁酸盐微阵及其催化活性成像

李建平*,1; 方成1; 顾海宁2   

  1. (1桂林工学院材料与化学工程系 桂林 541004)
    (2浙江大学化学系 杭州 310028)
  • 收稿日期:2005-09-26 修回日期:2006-03-09 出版日期:2006-09-14 发布日期:2006-09-14
  • 通讯作者: 李建平

Deposition and Catalytic Activity Imaging of Metal Hexacyanoferrate Microarray by Scanning Electrochemical Microscopy

LI Jian-Ping*,1; FANG Cheng1; GU Hai-Ning2   

  1. (1 Department of Materials and Chemistry Engineering, Guilin University of Technology, Guilin 541004)
    (2 Department of Chemisty, Zhejiang University, Hangzhou 310028)
  • Received:2005-09-26 Revised:2006-03-09 Online:2006-09-14 Published:2006-09-14
  • Contact: LI Jian-Ping

Scanning electrochemical microscopy (SECM) was used to deposit and visually characterize localized precipitate microarrays of copper hexacyanoferrate and iron hexacyanoferrate on glassy carbon electrode (GCE), respectively. Dissolution of a sacrificial Cu microelectrode and stripping of Fe pre-deposited on a platinum microelectrode generated relevant metal cations in the gap between the microelectrode and the GCE, which precipitated some [Fe(CN)6]4- anions that were generated simultaneously by reduction of [Fe(CN)6]3- at the GCE. By moving the microelectrode in the “skip-dip deposition” mode, precipitate-dot microarrays of copper hexacyanoferrate (CuHCF) and iron hexacyanoferrate (FeHCF), typically of about 25 μm diameter for each dot, was fabricated, respectively. The diameter and thickness of disk-shaped precipitate dot could be modified by changing the concentration of K3[Fe(CN)6] or the deposition time. The deposited metal hexacyanoferrate microstructures showed catalytic activity for the oxidation of dopamine and the reduction of hydrogen peroxide, respectively, which were characterized visually by SECM.

Key words: scanning electrochemical microscopy, microarray, hexacyanoferrate, dopamine, hydrogen peroxide, imaging