Unexpected current-voltage characteristics of mechanically modulated atomic contacts with the presence of molecular junctions in an electrochemically assisted-MCBJ

In this article, we report on the characterization of various molecular junctions＇ current-voltage characteristics （Ⅰ-Ⅴ curves） evolution under mechanical modulations, by employing a novel electrochemically assisted-mechanically controllable break junction （EC-MCBJ） method. For 1,4-benzenedithiol, t...

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Bibliographic Details
Published in:Nano research 2016-02, Vol.9 (2), p.560-570
Main Authors: Yang, Yang, Liu, Junyang, Feng, Shi, Wen, Huimin, Tian, Jinghua, Zheng, Jueting, Schöllhorn, Bernd, Amatore, Christian, Chen, Zhongning, Tian, Zhongqun
Format: Article
Language:English
Subjects:
Analogies
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Constants
Contact
Current voltage characteristics
Electrodes
Evolution
Feasibility
Materials Science
Model testing
Modulation
Motor task performance
Nanotechnology
Reproducibility
Research Artice
Ruthenium
Ruthenium compounds
Stability
Ultrasonic testing
Voltage
分子连接
原子
曲线演化
电化学
电流-电压特性
电流电压特性
调制
辅助机械
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Summary:In this article, we report on the characterization of various molecular junctions＇ current-voltage characteristics （Ⅰ-Ⅴ curves） evolution under mechanical modulations, by employing a novel electrochemically assisted-mechanically controllable break junction （EC-MCBJ） method. For 1,4-benzenedithiol, the Ⅰ-Ⅴ curves measured at constant electrode pair separation show excellent reproducibility, indicating the feasibility of our EC-MCBJ method for fabricating molecular junctions. For ferrocene-bisvinylphenylmethyl dithiol （Fc-VPM）, an anomalous type of Ⅰ-Ⅴ curve was observed by the particular control over the stepping motor. This phenomenon is rationalized assuming a model of atomic contact evolution with the presence of molecular junctions. To test this hypothesized model, a molecule with a longer length, 1,3-butadiyne-linked dinuclear ruthenium（H） complex （Ru-1）, was implemented, and the Ⅰ-Ⅴ curve evolution was investigated under similar circumstances. Compared with Fc-VPM, the observed Ⅰ-Ⅴ curves show close analogy and minor differences, and both of them fit the hypothesized model well.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-015-0937-1