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Volume 46 Number 6 Volume 47 Number 1

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Research articles

ScienceAsia 46 (2020): 691-696 |doi: 10.2306/scienceasia1513-1874.2020.093


Study of the surface structure of Fe quantum wire prepared by electrochemical method in solution


Zhaoyun Yua, Yong Xiab, Xiaodong Donga,*

 
ABSTRACT:     The surface structural characteristics of Fe quantum wires prepared by two electrochemical methods in solution were studied by their conductance changes caused by the interactions between the quantum wires and specific molecules. Once ascorbic acid was added into the solution, the conductance of the Fe junction decreased to a lower value while for the dopamine adsorption, the conductance showed no obvious change. We proposed that there were some iron(II) ions on the surface of atomic-scale Fe junction, not iron(III) ions, and these iron(II) ions played a significant role for the conductance change. This mechanism was further enhanced by the following two experiments. When exposing the quantum wire to sodium borohydride, the conductance increased to a higher value, and the conductance increase was also observed with an electrochemical reduction process, which provided additional evidence for the proposed mechanism.

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a Medical College, Hebei University, Baoding 071002 China
b State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 China

* Corresponding author, E-mail: xddong@hbu.edu.cn

Received 6 Jul 2020, Accepted 18 Oct 2020