In-situ preparation of a single molecular junction with mechanically controllable break junctions in vacuum

Kiguchi, Manabu; Sekiguchi, Nobuo; Murakoshi, Kei

doi:10.1088/1742-6596/100/5/052059

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Conductance measurement of single molecule junctions is mainly based on molecules with a long chain. There are seldom reports on the molecular conductance with ultrashort chain except ethanedithiol molecule bridging to Au electrode . But this kind of molecule would be useful when small resistance is needed, and the study of conductance of molecule will also help to understand the electron transport mechanism through ultrashort distance between two electrodes.…”

Section: Resultsmentioning

confidence: 99%

Single Molecule Conductance of Carboxylic Acids Contacting Ag and Cu Electrodes

et al. 2012

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In this work, the single molecule conductance of alkanedicarboxylic acid (HOOC-(CH2)(n)-COOH, n = 1-5) binding to Cu and Ag electrodes is systematically studied by using the electrochemical jump-to-contact scanning tunneling microscopy break junction approach (ECSTM-BJ). The results show that the conductance depends on molecular length and the electrode materials, which give a decay constant beta(N) of 0.95 +/- 0.02 per (-CH2) unit for Cu electrodes and 0.71 +/- 0.03 for Ag electrodes. The contact conductance shows the order of G(n=0,Cu) > G(n=0,Ag). These differences can be attributed to the different electronic coupling efficiencies between molecules and electrodes. The conductance of ultrashort molecular junctions is also studied using oxalic acid as the target molecule, the results revealing that the through-space mechanism (TS) should be considered when the distance between two electrodes is very short. The present work demonstrates that electrode materials play an important role on the molecular conductance, contact conductance, and also the tunneling decay constant.NSFC [21003110, 21273204, 20973141, 20911130235]; Planned Science and Technology Project of Zhejiang Province [2011C37052]; Scientific Research Fund of Zhejiang Provincial Education Department [Y201016469

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Section: Resultsmentioning

confidence: 99%

Single Molecule Conductance of Carboxylic Acids Contacting Ag and Cu Electrodes

et al. 2012

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“…Histograms that only show a single peak and for which the identification in terms of these three categories was not discussed are shown by gray symbols. The data includes published work from (Arroyo et al, 2011;Chen et al, 2006;Cui et al, 2001;Gil et al, 2018;González et al, 2006;Haiss et al, 2009Haiss et al, , 2004He et al, 2006;Hihath et al, 2008;Huang et al, 2007;Huisman et al, 2008;Jang et al, 2006;Kiguchi et al, 2008a;Kim et al, 2011a,c;Li et al, , 2006Martin, 2010;Nishikawa et al, 2007;Park et al, 2007;Rascón-Ramos et al, 2015;Sek et al, 2006;Song et al, 2009Song et al, , 2010Su et al, 2015;Ulrich et al, 2006;Wierzbinski and Slowinski, 2006;Xia et al, 2008;. The spread in the data is large, but the systematic trends in the separate works is shown by connecting the data points obtained from three works, namely (Ulrich et al, 2006), H-peak from , and H-peak from (Haiss et al, 2009).…”

Section: Alkanedithiolsmentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

Evers,

Korytár,

Tewari

et al. 2019

Preprint

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Electronic transport properties for single-molecule junctions have been widely measured by several techniques, including mechanically controllable break junctions, electromigration break junctions or by means of scanning tunneling microscopes. In parallel, many theoretical tools have been developed and refined for describing such transport properties and for obtaining numerical predictions. Most prominent among these theoretical tools are those based upon density functional theory. In this review, theory and experiment are critically compared and this confrontation leads to several important conclusions. The theoretically predicted trends nowadays reproduce the experimental findings quite well for series of molecules with a single well-defined control parameter, such as the length of the molecules. The quantitative agreement between theory and experiment usually is less convincing, however. Many reasons for quantitative discrepancies can be identified, from which one may decide that qualitative agreement is the best one may expect with present modeling tools. For further progress, benchmark systems are required that are sufficiently well-defined by experiment to allow quantitative testing of the approximation schemes underlying the theoretical modeling. Several key experiments can be identified suggesting that the present description may even be qualitatively incomplete in some cases. Such key experimental observations and their current models are also discussed here, leading to several suggestions for extensions of the models towards including dynamic image charges, electron correlations, and polaron formation.

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