On the mechanism of electrochemical modulation of plasmonic resonances

Shao, Li‐Hua; Rüther, Matthias; Lindén, Stefan; Wegener, Martin; Weißmüller, J.

doi:10.1063/1.4753805

Cited by 9 publications

(8 citation statements)

References 26 publications

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“…The optical properties of noble-metal nanomaterials are of great interest and have been extensively applied in biomolecule sensing, cancert herapy,n anophotonics,a nd solar cell studies. [1][2][3] Silver nanoparticles (AgNPs) offer high conductivity as wella sar easonably close approach to the behavior of free electrons,w hich display the most efficient localized surface plasmonic resonance (LSPR) with no inter-band transitions in the visible region. [4] Based on these specific properties, silver nanoparticles have attracted considerable attention in developing electrochemical sensors and nanocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Structural Change of a Single Ag Nanoparticle Observed by Dark‐field Microspectroscopy

Pang

Liu

et al. 2018

ChemPhysChem

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Silver nanoparticles (AgNPs) have been widely used as photocatalysts and nanosensors. Observation of the spectroscopy of a single AgNP greatly helps us understand the catalytic characteristics and morphology change of the AgNP during reactions. In the present study, AgNPs physically adsorbed on indium tin oxide (ITO) conductive glass were electrochemically reduced and oxidized, and the plasmonic resonance Rayleigh scattering (PRRS) spectrum of an individual AgNP was observed under a dark-field microscopy (DFM) equipped with a spectrometer. The electrochemical oxidization of the AgNP under constant potential caused a redshift of the PRRS peak for 30±5 nm. However, electrochemical reduction of the AgNP could not make the PRRS peak completely shift back to the initial position. In situ AFM and SEM characterization confirmed that very small Ag fragments (<10 nm) formed around the AgNP core during electrochemical oxidization. Results showed that dark-field microspectroscopy could be used as a sensitive tool for estimating the morphology/structural changes of nanoparticles that can hardly be observed through the cyclic voltammograms of multiple AgNPs.

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Section: Introductionmentioning

confidence: 99%

Structural Change of a Single Ag Nanoparticle Observed by Dark‐field Microspectroscopy

Pang

Liu

et al. 2018

ChemPhysChem

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“…Gold and other metals have already been used for optical electrochemical experiments in various shapes and forms. Among these are continuous metal films 3 4 5 6 7 8 , metallic nanoparticles 25 26 27 28 , nanoholes in metal films 29 30 , as well as metamaterials 20 31 32 . This large interest originates from the fact that metals are able to strongly concentrate light and by that allow for very localized and sensitive measurements.…”

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confidence: 99%

Electrochemical tuning of the optical properties of nanoporous gold

Jalas

Shao

Canchi

et al. 2017

Sci Rep

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Using optical in-situ measurements in an electrochemical environment, we study the electrochemical tuning of the transmission spectrum of films from the nanoporous gold (NPG) based optical metamaterial, including the effect of the ligament size. The long wavelength part of the transmission spectrum around 800 nm can be reversibly tuned via the applied electrode potential. The NPG behaves as diluted metal with its transition from dielectric to metallic response shifted to longer wavelengths. We find that the applied potential alters the charge carrier density to a comparable extent as in experiments on gold nanoparticles. However, compared to nanoparticles, a NPG optical metamaterial, due to its connected structure, shows a much stronger and more broadband change in optical transmission for the same change in charge carrier density. We were able to tune the transmission through an only 200 nm thin sample by 30%. In combination with an electrolyte the tunable NPG based optical metamaterial, which employs a very large surface-to-volume ratio is expected to play an important role in sensor applications, for photoelectrochemical water splitting into hydrogen and oxygen and for solar water purification.

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“…Particularly, chemical changes due to electrochemical reactions offer a unique approach for electrically controllable plasmonics that are sensitive to the chemical constituent and the surface carrier properties of the nanostructures. Electrochemical potential controlled plasmonic devices have recently been reported and should prove useful for active and fine tuning of plasmonic properties of metallic metasurfaces . Dramatic plasmonic resonance tuning based on surface‐charge density modulation was first observed in arrays consisting of 10 nm thick gold SRR and has been recently reidentified in gold nanoporous systems with remarkable surface‐to‐volume ratios .…”

Section: Other Materials and Methodsmentioning

confidence: 99%

Recent Progress in Active Optical Metasurfaces

Kang

Jenkins

Werner

2019

Advanced Optical Materials

146

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Evolving from metamaterials, optical metasurfaces not only inherit their unprecedented flexibility in tailoring light–matter interaction but also the generally fixed response determined by the metaatoms' geometries—an undesirable property that hinders the development of practical metadevices. Consequently, novel optical metasurfaces that can be tuned in an active manner are intensively studied in recent years. Due to their optically thin structures, optical metasurfaces present unique characteristics in the realization of dynamic tuning. In this review, a detailed summary of the recent advances in active optical metasurfaces is provided including discussions reviewing a variety of active materials and approaches that enable faster, stronger, and more accurate tuning. Beyond facilitating practical metadevices, studies of active metasurfaces have, and will continue to deepen the understandings of the interaction between light and nanostructured photonic architectures and to promote the development of nanofabrication techniques involving high‐complexity.

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On the mechanism of electrochemical modulation of plasmonic resonances

Cited by 9 publications

References 26 publications

Structural Change of a Single Ag Nanoparticle Observed by Dark‐field Microspectroscopy

Structural Change of a Single Ag Nanoparticle Observed by Dark‐field Microspectroscopy

Electrochemical tuning of the optical properties of nanoporous gold

Recent Progress in Active Optical Metasurfaces

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