Electric conductance of metal nanowires at mechanically controllable break junctions under electrochemical potential control

Kiguchi, Manabu; Sekiguchi, Nobuo; Murakoshi, Kei

doi:10.1016/j.susc.2007.04.218

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…An important example is conductance quantization in nanowire systems. 1 Metal nanowires on an atomic scale, spoken of as atomic contacts, have been fabricated mainly by three techniques: scanning tunneling microscopy break junction (STM-BJ), [2][3][4] mechanically controllable break junction, 5,6 (MCBJ) and electrochemistry. 7,8 The phenomenon occurs when the diameter of the nanowire is comparable to the electron Fermi wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…An important example is conductance quantization in nanowire systems . Metal nanowires on an atomic scale, spoken of as atomic contacts, have been fabricated mainly by three techniques: scanning tunneling microscopy break junction (STM-BJ), − mechanically controllable break junction, , (MCBJ) and electrochemistry. , The phenomenon occurs when the diameter of the nanowire is comparable to the electron Fermi wavelength . If, in addition, the nanowire is shorter than the electron mean free path, the electrons are transported ballistically along the nanowires, and the conductance is given by the Landauer formula, where T i is the transmission probability of the i th conductance channel, e the electron charge, and h the Planck constant.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Metallic Nanowires via Electrochemistry in Aqueous Surfactant Media

et al. 2010

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Atomic contacts between two copper microelectrodes, with conductance close to the conductance quantum (G 0 ), have been generated using simple electrochemical methods in aqueous media containing various types of surfactant. Neutral and cationic surfactant have only a small impact on the conductance with a preponderant value around 1 G 0 . Furthermore, varying the concentration of the neutral and cationic surfactants above or below the critical micellar concentration (cmc) during the growth process does not lead to any significant variation in the conductance. In contrast, atomic contacts generated in a solution containing an anionic surfactant below the cmc have unusual but reproducible properties. They have <1 G 0 conductance and their conductance versus time behavior shows steps at fractional values of the quantum. I/V characterization shows ohmic behavior, supporting the formation of metallic contacts with quantized conductances. The low-conductance value (<1 G 0 ) is attributed to the occurrence of molecular adsorption at the contact. This specific effect seems to be closely related to the cmc. Indeed, when the anionic surfactant concentration is increased above the cmc, the contacts have conductances close to those in neutral or cationic surfactant solution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Metallic Nanowires via Electrochemistry in Aqueous Surfactant Media

et al. 2010

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“…Similarly, an adhesive coated on 8 × 8 AM-PDMS demonstrated a significantly higher reduction in adhesion strength when compared to the adhesive coated on 16 × 16 AM-PDMS (Figure S17). The wire diameter for 8 × 8 AM (diameter = 0.028″) was significantly higher when compared to that of the 16 × 16 AM (diameter = 0.018″), which resulted in a significant increase in the level of recorded electrical current. , These results collectively indicated that the level of electrical current passing through the adhesive interface has a significant impact on the rate of adhesive deactivation.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Deactivation of Switchable Catechol-Containing Smart Adhesive from Nonconductive Surfaces

Bhuiyan

Manuel

Razaviamri

et al. 2023

ACS Appl. Polym. Mater.

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The feasibility of deactivating and reactivating a catechol-containing smart adhesive electrochemically while in direct contact with a nonconductive surface was explored in this work. The adhesive was coated over an aluminum mesh-attached poly(dimethylsiloxane) (AM-PDMS) substrate. The aluminum mesh served as an electrode to apply electricity through the adhesive. A silver (Ag) counter electrode was coated in the periphery of the adhesive–substrate interface to deactivate the adhesive attached to the nonconductive surfaces including glass and poly(methyl methacrylate) (PMMA) substrates. The deactivation of the adhesive was performed with the application of up to 20 V of applied electricity utilizing the Ag electrode as a cathode and the aluminum mesh as an anode. The adhesion strength of the adhesive toward nonconductive surfaces decreased by 98% after in situ application of electricity. The deactivation rate was tunable with the applied voltage level, exposure time to the applied voltage, surface area of the adhesive interface, and aluminum mesh size. The deactivated adhesive was reactivated electrochemically by reversing the electrode polarity up to 3 cycles utilizing catechol–boronate complexation chemistry.

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“…An exemplary conductance-over-time measurement is shown in Figure 4A. The data from Figure 4A are plotted as a histogram in Figure 4B, showing increased occurrences of values at or near integer multiples of G 0 [28][29][30]. Such a quantized decrease of the conductance is expected for break junctions.…”

Section: Electrical Measurementsmentioning

confidence: 93%

A flexible platform for controlled optical and electrical effects in tailored plasmonic break junctions

et al. 2020

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AbstractMechanically controllable break junctions are one suitable approach to generate atomic point contacts and ultrasmall and controllable gaps between two metal contacts. For constant bias voltages, the tunneling current can be used as a ruler to evaluate the distance between the contacts in the sub-1-nm regime and with sub-Å precision. This ruler can be used to measure the distance between two plasmonic nanostructures located at the designated breaking point of the break junction. In this work, an experimental setup together with suitable nanofabricated break junctions is developed that enables us to perform simultaneous gap-dependent optical and electrical characterization of coupled plasmonic particles, more specifically bowtie antennas in the highly interesting gap range from few nanometers down to zero gap width. The plasmonic break junction experiment is performed in the focus of a confocal microscope. Confocal scanning images and current measurements are simultaneously recorded and exhibit an increased current when the laser is focused in the proximity of the junction. This setup offers a flexible platform for further correlated optoelectronic investigations of coupled antennas or junctions bridged by nanomaterials.

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Electric conductance of metal nanowires at mechanically controllable break junctions under electrochemical potential control

Cited by 9 publications

References 12 publications

Formation of Metallic Nanowires via Electrochemistry in Aqueous Surfactant Media

Formation of Metallic Nanowires via Electrochemistry in Aqueous Surfactant Media

Electrochemical Deactivation of Switchable Catechol-Containing Smart Adhesive from Nonconductive Surfaces

A flexible platform for controlled optical and electrical effects in tailored plasmonic break junctions

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