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Title
Japanese: 
English:Appearance of Different Conductance States in Monomolecular Films of Ferrocene-Decorated Triptycene-Based Tripods 
Author
Japanese: Y. Liu, S. Sanjayan, 庄子 良晃, 福島 孝典, M. Zharnikov.  
English: Y. Liu, S. Sanjayan, Y. Shoji, T. Fukushima, M. Zharnikov.  
Language English 
Journal/Book name
Japanese: 
English:The Journal of Physical Chemistry C 
Volume, Number, Page Volume 127    Issue 50    Page 24458-24466
Published date Dec. 11, 2023 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://pubs.acs.org/doi/10.1021/acs.jpcc.3c06634
 
DOI https://doi.org/10.1021/acs.jpcc.3c06634
Abstract Ferrocene (Fc) is a widely used building block of molecular rectifiers in the context of molecular electronics. Here, we studied the molecular organization and charge transport properties of the Fc-substituted, triptycene-based tripodes (Fc-Trip), assembled on Au(111) in the self-assembled monolayer-like fashion. The most intriguing property of this system is the occurrence of two distinctly different conductance states, high and low (HCS and LCS, respectively), which can be accessed dynamically by either asymmetric or symmetric bias sweeping in molecular junctions featuring bottom Au (substrate) and top EGaIn electrodes. For the asymmetric sweeping mode, the difference between these states results in an effective rectification ratio (RR) of ∼400–600 at such a small bias as 0.1–0.2 V, which is in contrast to other Fc-based molecular rectifiers showing high RR at a bias of 1.0 V and higher. Following a literature model, the observed behavior was explained by bias-induced, nonreversible oxidation of the Fc groups in combination with conformational changes in the molecular film. The above results show that redox groups in ME systems, including metallocenes in particular, can exhibit a complex behavior that can only be observed by the variation of the sweeping mode and monitoring of individual sweeps.

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