Effect of deposition potential and concentration of electroactive substances on Bi2Te3 nanowires fabricated by electrochemical method

Li Wenxin; Zhao Wangchen; Zhou Yanpeng; Liu Yanning; Li Ya; Jiang Ruomei; Zhang Linbo; Zhang Li; Zhou Peiheng; Deng Longjiang

doi:10.1088/1361-6528/ab0bde

Effect of deposition potential and concentration of electroactive substances on Bi₂Te₃ nanowires fabricated by electrochemical method

Nanotechnology. 2019 Jun 14;30(24):245702. doi: 10.1088/1361-6528/ab0bde. Epub 2019 Mar 1.

Authors

Li Wenxin¹, Zhao Wangchen, Zhou Yanpeng, Liu Yanning, Li Ya, Jiang Ruomei, Zhang Linbo, Zhang Li, Zhou Peiheng, Deng Longjiang

Affiliation

¹ University of Electronic Science and Technology of China, People's Republic of China. National Engineering Research Center of Radiation Control Materials, People's Republic of China. Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education, People's Republic of China.

PMID: 30822773
DOI: 10.1088/1361-6528/ab0bde

Abstract

In this paper, Bi₂Te₃ nanowires were prepared in anodized aluminum oxide template by electrochemical deposition. The morphological microstructural and electrical resistance characteristics of the nanowires were discussed to reveal the effect of deposition potential and electroactive substance (HTeO₂ ⁺) concentration. According to the electrode dynamics formula, it is found that the increase of electrode potential leads to the decrease of deposition current, so that deposition rate of nanowires decreases. At the same time, the deposition current controlled by diffusion in the mass transport process will have a maximum value with the increasing of deposition time. The deposition potential determines the favorable crystal plane for nanowires growth by the selection of proper surface energy. The temperature dependence of resistances in Bi₂Te₃ nanowires fabricated under different concentration of HTeO₂ ⁺ reveals the transformation of the carriers' main scattering mechanism. This study could provide a better understanding of the deposition process of Bi₂Te₃ nanowires.