Reversible Electrochemical Tuning of Optical Property of Single Au Nano-bridged Structure via Electrochemical under Potential Deposition

Oikawa, Shunpei; Minamimoto, Hiro; Murakoshi, Kei

doi:10.1246/cl.170427

Cited by 13 publications

(16 citation statements)

References 21 publications

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“…Recently,w eh ave performed electrochemical underpotentiald eposition of Cu on the surfaces of Au bridged structures. [91] The change in the opticalp roperties that was dependento nt he presence of the single atom layer of Cu was confirmed through dark field scatteringm icroscope measurements. As an additional advantage of the electrochemical method, repeatable opticalp roperty changes were easily achieved.…”

Section: Atomicscale Control Of the Metal Nanostructuresmentioning

confidence: 82%

“…In addition, changes in the CTP modes that were dependent on the deposition of AgCl were also discussed. Recently, we have performed electrochemical underpotential deposition of Cu on the surfaces of Au bridged structures . The change in the optical properties that was dependent on the presence of the single atom layer of Cu was confirmed through dark field scattering microscope measurements.…”

Section: Control Of the Plasmonic Structuresmentioning

confidence: 90%

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Plasmonic Fields Focused to Molecular Size

Minamimoto

Oikawa

et al. 2017

ChemNanoMat

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Efficient use of light energy is regarded as a key factor in solving energy challenges to create a sustainable society. The highly concentrated photon energy generated by localized surface plasmon resonance excitation in the vicinity of metal nanostructures can enhance light‐matter interaction. Optimization of the interactions between plasmons and electrons in materials can lead to novel light energy applications. To overcome the current limitations for these interactions, the plasmon field must be focused to an extremely small size close to the molecular scale. Formation of the plasmonic field at the quantum limit may cause interesting phenomena with unique photoresponses. Recently, following the development of nanofabrication techniques, detailed investigations have been undertaken to understand these processes. In this focus review, we describe recent advances in the strong interactions between highly localized photons and electrons in nanomaterials, including molecules, nanocarbons, and quantized nanoparticles. First, we outline the plasmonic properties that depend on the metal nanostructures. In addition, we describe surface‐enhanced Raman scattering (SERS), which is used to detect interactions between plasmons and materials. The importance of the resonant electronic excitation process, which is a chemical effect based on the charge transfer contribution, is discussed while considering the unique molecular selectivity in SERS. We then highlight the unique photoresponse properties that are used for ultra‐sensitive detection of single molecules by the localized plasmon field. These properties are major advantages of the plasmon field. Next, we introduce strong coupling between plasmons and excitons. This coupling state is promising because of its ability to modify the intrinsic optical properties of materials via creation of a novel absorption wavelength region to accumulate the light energy. Finally, we discuss the use of plasmon excitation for effective chemical reactions accompanied by electron transfer. We conclude that reduction of light to the molecular scale would open novel routes for energy manipulation required by the next generation.

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Section: Atomicscale Control Of the Metal Nanostructuresmentioning

confidence: 82%

Section: Control Of the Plasmonic Structuresmentioning

confidence: 90%

Plasmonic Fields Focused to Molecular Size

Minamimoto

Oikawa

et al. 2017

ChemNanoMat

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“…Until now, we have attempted to tune the electrochemical oxidation dissolution reaction at the Au nanostructure surface in aqueous halogen solution. [38][39][40] As shown in leading to strong light energy condensation at the gap. According to the previous theoretical study, it was estimated that, ranging between −0.5 and 0.5 nm, the CTP mode changes to the BQP mode, then the BDP mode is observed with increasing the gap distance more than 0.5 nm.…”

Section: Accepted M Manuscriptmentioning

confidence: 91%

Precise Control of Nanoscale Interface for Efficient Electrochemical Reactions

Minamimoto

Murakoshi

2021

Electrochemistry

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“…The electrolyte solution was a mixed solution of 1 mM 44bpy and 22bpy containing 0.1 M NaClO 4 . The Au dimer structures were fabricated by the electron beam lithography technique by following the already established method . Raman measurements were carried out at the backscattering configuration collecting the scattering photons under the near-infrared laser light illumination polarized in the parallel or perpendicular direction.…”

Section: Methodsmentioning

confidence: 99%

In Situ Observation of Unique Bianalyte Molecular Behaviors at the Gap of a Single Metal Nanodimer Structure via Electrochemical Surface-Enhanced Raman Scattering Measurements

2019

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Electrochemical surface-enhanced Raman scattering measurements of a monomolecule layer have been performed using a single Au dimer structure with a well-defined gap distance. Through the bianalyte measurements under the electrochemical potential control, we have successfully observed the change in the adsorption states depending on the electrochemical potential at the surface of the Au structure. The time-dependent dynamics of the formation of the mixed bianalyte layer was clarified to form unique adsorbed states under excitation light illumination on the surface.

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Reversible Electrochemical Tuning of Optical Property of Single Au Nano-bridged Structure via Electrochemical under Potential Deposition

Cited by 13 publications

References 21 publications

Plasmonic Fields Focused to Molecular Size

Plasmonic Fields Focused to Molecular Size

Precise Control of Nanoscale Interface for Efficient Electrochemical Reactions

In Situ Observation of Unique Bianalyte Molecular Behaviors at the Gap of a Single Metal Nanodimer Structure via Electrochemical Surface-Enhanced Raman Scattering Measurements

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