Quantized conductance behavior of Pt metal nanoconstrictions under electrochemical potential control

Konishi, Tatsuya; Kiguchi, Manabu; Murakoshi, Kei

doi:10.1016/j.susc.2007.04.071

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Hydrogen does not adsorb on the coin metals gold, copper, and silver because the d-bands of these metal lie too low. It was therefore surprising when Kigushi et al , suggested that they had observed hydrogen adsorption on monatomic wires of gold and copper but not on silver. Specifically, they had measured the conductivities of these monatomic wires in aqueous solutions and had expected to find multiples of the quantum of conductivity 2 e 0 2 / h .…”

Section: Catalysis On Metal Electrodesmentioning

confidence: 99%

Models of Electron Transfer at Different Electrode Materials

Santos

Schmickler

2022

Chem. Rev.

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Electron transfer is the most important electrochemical process. In this review, we present elements of various aspects of electron transfer theory from the early work of Marcus and Hush to recent developments. The emphasis is on the role of the electronic, and to a lesser extent the geometrical, properties of the electrode. A variety of experimental works are discussed in light of these theoretical concepts. Because the field of electron transfer is so vast, this review is far from comprehensive; rather, we focus on systems that offer a special interest and illuminate aspects of the theory.

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Section: Catalysis On Metal Electrodesmentioning

confidence: 99%

Models of Electron Transfer at Different Electrode Materials

Santos

Schmickler

2022

Chem. Rev.

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“…46 Similar stabilization of atom-sized contacts under negative potential was also observed by Li et al for monatomic contacts of Pd, a metal which is well-known to have great affin- ity to hydrogen, indicating that hydrogen adsorption may play an important role in electrochemical stabilization. 48 The stabilization of metal nanowires by adsorption of hydrogen and other molecules has also been reported for Au, 49,55 Pd, 56 Pt, 57 Cu, 58 Ag, 55 and Ni 59,60 as well as Al, Ta, and Nb. 61 Another reason for electrochemical stabilization could simply be thermodynamics.…”

Section: Resultsmentioning

confidence: 79%

Electrochemical Control of Stability and Restructuring Dynamics in Au−Ag−Au and Au−Cu−Au Bimetallic Atom-Scale Junctions

Shi

Bohn

2010

ACS Nano

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Metallic atom-scale junctions (ASJs) are interesting fundamentally because they support ballistic transport, characterized by conduction quantized in units of G(0) = 2e(2)/h. They are also of potential practical interest since ASJ conductance is extraordinarily sensitive to molecular adsorption. Monometallic Au ASJs were previously fabricated electrochemically using an I(-)/I(3)(-) medium and a unique open working electrode configuration to produce slow electrodeposition or electrodissolution, resulting in reproducible ASJs with limiting conductance <5 G(0). Here, bimetallic Au-Cu-Au and Au-Ag-Au ASJ structures are obtained by electrochemical deposition/dissolution of Cu and Ag in K(2)SO(4) supporting electrolyte. The ASJs are fabricated in Si(3)N(4)-protected Au nanogaps obtained by focused ion beam milling, a protocol which yields repeatable and reproducible Au-Cu-Au or Au-Ag-Au ASJs without damaging the Au nanogap substrates. While Au-Ag-Au ASJs are relatively stable (hours) at open circuit potential in the supporting electrolyte, Au-Cu-Au ASJs exhibit spontaneous restructuring dynamics, characterized by monotonic, stepwise decreases in conductance under the same conditions. However, the Au-Cu-Au ASJs can be stabilized by applying sufficiently negative potentials. Hydrogen adsorption and shifts in the Fermi level are possible reasons for the enhanced stability of Au-Cu-Au structures at large negative overpotentials. In light of these observations, it is possible to integrate ASJs in microfluidic devices as renewable, nanostructured sensing elements for chemical detection.

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