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Nano Research

Article Title

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

Authors

Yang Yang, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Junyang Liu, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Shi Feng, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Huimin Wen, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Jinghua Tian, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Jueting Zheng, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Bernd Schllhorn, CNRS UMR 8640 PASTEUR and LIA CNRS NanoBioCatEchem, Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités – UPMC Paris 6, 24, rue Lhomond, 75005 Paris, France
Christian Amatore, CNRS UMR 8640 PASTEUR and LIA CNRS NanoBioCatEchem, Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités – UPMC Paris 6, 24, rue Lhomond, 75005 Paris, France
Zhongning Chen, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Zhongqun Tian, Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China

Keywords

molecular junction, electrochemical deposition, mechanically controllablebreak junction (MCBJ), ruthenium complex, ferrocenyl molecular wire

Abstract

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(II) 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.

Graphical Abstract

Publisher

Tsinghua University Press

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