Highly Conductive Molecular Junctions Based on Direct Binding of Benzene to Platinum Electrodes

Kiguchi, Manabu; Tal, Oren; Wohlthat, Sören; Pauly, Fabian; Krieger, Michael; Djukic, D.; Cuevas, Juan Carlos; Ruitenbeek, J. M. van

doi:10.1103/physrevlett.101.046801

Cited by 302 publications

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“…In this sense, it would be highly desirable to widen the list of materials that can be used as electrodes. 2,7 Carbon is obviously a good candidate as an electrode material in molecular electronics because it offers the possibility to contact a variety of molecules without the need of anchoring groups, it is also relatively inert, and it forms structures like graphene 8,9 and nanotubes 10 that can be used as nanoelectrodes.…”

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confidence: 99%

Carbon tips as electrodes for single-molecule junctions

Castellanos-Gómez

Bilan

Zotti

et al. 2011

Applied Physics Letters

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The following article appeared in Applied Physics Letters vol 99,12 (2011): 123105 and may be found at http://scitation.aip.org/content/aip/journal/apl/99/12/10.1063/1.3643031?showFTTab=true&containerItemId=content/aip/journal/aplWe study electron transport through single-molecule junctions formed by an octanethiol molecule bonded with the thiol anchoring group to a goldelectrode and the opposing methyl endgroup to a carbon tip. Using the scanning tunneling microscope based break junction technique, we measure the electrical conductance of such molecular junctions. We observe the presence of well-defined conductance plateaus during the stretching of the molecular bridge, which is the signature of the formation of a molecular junction.Acknowledges fellowship support from the Comunidad de Madrid (Spain). This work was supported by MICINN (Spain) through the programs MAT2008-01735 and CONSOLIDER-INGENIO-2010 CSD-2007-00010, by Comunidad de Madrid through the program NANOBIOMAGNET S2009/MAT1726, by the EU through the networks BIMORE (MRTN-CT-2006-035859),and by the EC through the network FP7 ITN “FUNMOLS”Project Number 212942

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confidence: 99%

Carbon tips as electrodes for single-molecule junctions

Castellanos-Gómez

Bilan

Zotti

et al. 2011

Applied Physics Letters

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“…14 IETS measurements using 12 C 6 H 6 and 13 C 6 H 6 molecules found isotropic effects were present in the resultant frequency spectra. 60 IETS can therefore be considered to be a powerful method for identifying single molecules (both in SMJs and otherwise); however, unlike IR and Raman spectroscopy, it is unclear how the selection rule for the vibration modes can be determined. Nevertheless, it has been experimentally found that when a molecule has a high symmetry, the vibration modes obtained by IETS are similar to those obtained by Raman spectroscopy.…”

Section: Single-molecule Analysis Methodsmentioning

confidence: 99%

“…65 Furthermore, platinum electrodes would easily adsorb hydrogen molecules. 60 Lastly, for single gold atom junctions, electrons flow through the orbitals of these junctions, which are composed of the 6s orbital of the gold atoms. Therefore, in single gold atom junctions, T is one.…”

Section: Single-molecule Analysis Methodsmentioning

confidence: 99%

“…Many different SMJs have been researched for this purpose, and a number that have values above 0.1 G 0 have been discovered. 59,60 Molecule-electrode coupling represents the strength of an electronic interaction. In order for SMJs to be stably maintained, it is preferable for them to be formed via chemical bonding.…”

Section: Single-molecule Analysis Methodsmentioning

confidence: 99%

“…From this result, it can be seen that the carriers in the single gold atom contacts were electrons, while the carriers in the SMJs were holes. Seebeck coefficient measurements of the SMJs were also performed with Au C 60 Au junctions, and the carriers in these junctions were found to be electrons. 85 In order to obtain S, there needs to be a temperature difference between the electrodes.…”

Section: Bond Strength Between Electrodes Andmentioning

confidence: 99%

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Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

Taniguchi

2017

Bulletin of the Chemical Society of Japan

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Single-molecule analysis methods facilitate the investigation of the properties of single-molecule junctions (SMJs), in which single molecules are connected between a pair of nanoelectrodes that use nanogap electrodes having a spacing of less than several nanometers. Various methods have been developed to investigate numerous useful parameters for SMJs; for example, the number of molecules connected between a pair of nanoelectrodes can be determined, the types and structures of single molecules can be revealed, localized temperatures within SMJs can be evaluated, and the Seebeck coefficient and the bond strength between single molecules and electrodes can be ascertained. Single-molecule analysis methods have also been used to analyze biopolymers in solutions, and this has resulted in single-molecule sequencing technologies being developed that can determine sequences of base molecules in DNA and RNA along with sequences of amino acids in peptides. Singlemolecule analysis methods are expected to develop into digital analysis techniques that can be used to investigate the physical and chemical properties of molecules at single-molecule resolutions.

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Molecular Electronics

Vuillaume

2023

Beyond‐CMOS

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The term molecular junction (MJ) refers to a simple device where molecules (from a monolayer to a single molecule) are connected between two electrodes (metal or semiconductor), Fig. 1. The number of molecules in the MJ depends on the size of these electrodes and the MJs are usually classified as "large area MJ" and "single (or a few) MJ". Albeit the Langmuir-Blodgett method was used in the early times of ME to deposit molecules on the electrode surfaces (only large area MJs), chemisorption is nowadays widely used because it is also suitable at the nanoscale to attach few molecules between electrodes of a nanometer dimension. In that case, the molecules are equipped with anchor groups at both (or only one) ends. The chemical nature of the anchor group is chosen depending on the nature of the electrodes to permit a chemical reaction with the electrode by forming a chemical bond between the molecule and the electrode. Archetypes of anchor groups are thiols (-SH) on metals (Au, Ag,…), alkenes (-C=C-) on hydrogenated-silicon surfaces, a detailed review is given in Refs [14][15][16] . This approach is widely versatile to adapt the molecules on the electrodes of interest. However, this chemical link also has a pronounced effect on the global electronic properties of the MJs, mainly governing the electronic coupling between molecules and electrodes (see below in this chapter) and this point has been extensively studied (see a At the nanoscale, scanning tunneling microscope (STM) and conductive probe atomic force microscope (C-AFM), are the tools of choice to study a single or a few (typically ≲ 100) molecules (right part of Fig. 1). For single molecule experiments, STM break-junctions (STM-BJ) 25 and mechanically controlled break junctions (MCBJ) 26 have been developed (see a review 27,28 ). In these BJ approaches, the two electrodes are repeatedly (up to thousands or more) moved close and apart and a molecule bridges the electrode gap when its size matches the electrode gap. The signature of the molecule conductance appears as plateaus in the current vs. gap electrode distance traces. C-AFM is used to gently contact (weak loading force) the monolayer [29][30][31] on large surfaces and to measure the current voltage at few hundreds places on the monolayer. Another approach is the use of tiny nanodot electrodes (nanodot-molecule junction, NMJ). 32,33 In this latter case, hundreds to thousands of nanodots (typically 5-40 nm in diameter) are fabricated by e-beam lithography and can be measured in a "one shot" single C-AFM image. Note that all these techniques require a large number of measurements and a solid statistic analysis to get reliable conductance values of the MJs. Finally, another approach is to use a 2D network of metal

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Highly Conductive Molecular Junctions Based on Direct Binding of Benzene to Platinum Electrodes

Cited by 302 publications

References 24 publications

Carbon tips as electrodes for single-molecule junctions

Carbon tips as electrodes for single-molecule junctions

Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

Molecular Electronics

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