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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 10: 1173 - 1178

DOI: https://doi.org/10.6023/A1110103

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Electrochemical Impedance Spectroscopic Study of Electrodeposited Bi2Te3-based Thin Films

  • Lin Qinghan ,
  • Qiu Liqin ,
  • Cheng Xuan ,
  • Zhou Jian
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  • a Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005;
    b Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005

Received date: 2011-10-10

  Revised date: 2012-03-07

  Online published: 2012-05-28

Supported by

Project supported by the Fujian Key Laboratory of Advanced Materials, China (No. 2006L2003).

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Abstract

The Bi2Te3-based thin films have been prepared by electrochemical deposition on stainless-steel substrates. The microstructure and composition of the films were studied by X-ray diffraction (XRD) and electron probe microanalysis (EPMA). The deposition mechanisms of Bi2Te3 thin films on stainless-steel substrates were preliminary investigated using electrochemical impedance spectroscopy (EIS). The results showed that the similar deposition mechanisms were obtained for Bi-Te binary and Bi-Te-Se ternary systems, i.e., the Bi3+, HTeO2+ and H2SeO3 were electrochemically reduced to form simple substances Bi(0), Te(0) and Se(0), respectively, then the Bi2Te3-based compounds were formed by reacting Te(0) or Se(0) with Bi(0). For Bi-Sb-Te ternary system, the HTeO2+ was first electrochemically reduced to form simple substance Te(0), and then the Bi2Te3-based compounds were formed by reacting Te(0) with Bi3+ and Sb(III). The deposition processes were controlled by electrochemical polarization.

Key words： Bi2Te3; electrochemical impedance spectroscopy; electrodeposition

Cite this article

Lin Qinghan , Qiu Liqin , Cheng Xuan , Zhou Jian . Electrochemical Impedance Spectroscopic Study of Electrodeposited Bi2Te3-based Thin Films[J]. Acta Chimica Sinica, 2012 , 70(10) : 1173 -1178 . DOI: 10.6023/A1110103

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