Atomic configuration and mechanical and electrical properties of stable gold wires of single-atom width

Kizuka, Tokushi

doi:10.1103/physrevb.77.155401

Cited by 163 publications

(203 citation statements)

References 96 publications

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“…High-resolution transmission electron microscopy ͑HRTEM͒ enables us to observe the atomic configuration directly. [40][41][42][43][44][45][46][47][48][49][50] However, the electrical and mechanical properties of Pt ASWs have not been related directly to the atomic configuration observed by HRTEM.…”

Section: Introductionmentioning

confidence: 99%

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Kizuka

Monna

2009

Phys. Rev. B

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Platinum ͑Pt͒ wires of single-atom width were produced by the retraction of a Pt nanotip from contact with a Pt plate at room temperature inside a transmission electron microscope. The distance between the nanotip and the plate was controlled using a conductance feedback system, as a result of which wires showing certain conductance values were observed continuously by in situ lattice imaging. Simultaneously, the force acting on the wires was measured using a function of atomic force microscopy. The tip-plate distance was also increased with a constant speed, and the atomic configuration, force, and conductance were similarly investigated. The single-atom-width Pt wires were found to exhibit straight shapes with an interatomic distance of 0.28Ϯ 0.03 nm. The wires were stable at a tensile force of approximately 1 nN; the observed interatomic distance resulted from elastic expansion. The present study demonstrated experimental evidence for the relationship between wire length and conductance; the wires extend from a three-atom length to a five-atom length as the selected feedback conductance decreases from 2.0 to 0.5G 0 ͑where G 0 =2e 2 / h, e being the charge of an electron and h Planck's constant͒. Contacts exhibiting a conductance of 3.0G 0 were two-atom-width contacts. In a conductance histogram constructed from the simple retraction, only one peak was observed at 1.3G 0 . Thus, it was found that the conductance of single-atom-width Pt wires is less than 3.0G 0 , with 1.3G 0 being that of the most-stable state.

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Section: Introductionmentioning

confidence: 99%

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Kizuka

Monna

2009

Phys. Rev. B

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“…In the experiment we conducted, the piezo element was displaced over time in the direction that would break the thin gold wire we used; when the conductance becomes zero, the wire is considered to be broken. 52 55 We found that when the piezo element was moved quickly, the wire broke more quickly. We also found that when the displacement speed of the piezo element was slower, a specific conductance value persisted for a longer period of time; this can be observed in Figure 4a.…”

Section: Nanogap Electrodesmentioning

confidence: 88%

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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“…26) We prepared two Mo nanotips of 5-20 nm thickness using mechanical polishing and argon ion milling. To produce NCs, the two nanotips were brought into contact inside the transmission electron microscope by piezo driving.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…7,11,12,14) However, the structural origin of the nonquantization of conductance remains unclear. In situ transmission electron microscopy (TEM) enables the direct observation of structural variations in NCs with the simultaneous measurement of their conductance, 26) and thus can be applied to NCs that do not exhibit conductance quantization. 26,[39][40][41][42][43][44][45][46][47] Molybdenum (Mo) NCs are a type of metallic NCs that do not show quantization features.…”

Section: Introductionmentioning

confidence: 99%

“…In situ transmission electron microscopy (TEM) enables the direct observation of structural variations in NCs with the simultaneous measurement of their conductance, 26) and thus can be applied to NCs that do not exhibit conductance quantization. 26,[39][40][41][42][43][44][45][46][47] Molybdenum (Mo) NCs are a type of metallic NCs that do not show quantization features. 24,25) In a previous study of Mo NCs, the peak of the minimum conductance value in the conductance histogram appeared at 2.4G 0 .…”

Section: Introductionmentioning

confidence: 99%

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Plastic Flowlike Deformation and Its Relation to Aperiodic Peaks in Conductance Histograms of Molybdenum Nanocontacts

Yamada

Kizuka

2016

J. Phys. Soc. Jpn.

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We observed the tensile deformation of molybdenum (Mo) nanocontacts (NCs) and simultaneously measured their conductance by in situ transmission electron microscopy. During deformation, the contact width decreased from several nanometers to a single-atom size. Mo NCs were thinned via a plastic flowlike deformation process. The process differs from the slip on lattice planes, which is frequently observed in NCs made of noble metals. We plotted histograms of the time-conductance traces measured during the tensile deformation of Mo NCs. In the conductance histograms, we observed peaks at 1.8G 0 (G 0 ＝2e 2 /h, where e is the electron charge and h is Planck's constant), 3.6G 0 , and 4.4G 0 . When the minimum conductance (1.8G 0 ) was measured, the minimum cross-sectional widths of the NCs were 3-7 atoms. These NCs exhibited relaxed structures that formed irregularly after the plastic flowlike deformation occurred in the final stage of the tensile process. We inferred that the aperiodic peaks observed in the conductance histograms originated from irregular variations in the contact areas and atomic configurations of the NCs during the plastic flowlike deformation.Moreover, the conductance value of the single-atom contacts was less than 0.1G 0 .

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Atomic configuration and mechanical and electrical properties of stable gold wires of single-atom width

Cited by 163 publications

References 96 publications

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

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

Plastic Flowlike Deformation and Its Relation to Aperiodic Peaks in Conductance Histograms of Molybdenum Nanocontacts

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