From tunable core-shell nanoparticles to plasmonic drawbridges: Active control of nanoparticle optical properties

Byers, Chad P.; Zhang, Hui; Swearer, Dayne F.; Yorulmaz, Mustafa; Hoener, Benjamin S.; Huang, Da; Hoggard, Anneli; Chang, Wei-Shun; Mulvaney, Paul; Ringe, Emilie; Halas, Naomi J.; Nordlander, Peter; Link, Stephan; Landes, Christy F.

doi:10.1126/sciadv.1500988

Cited by 161 publications

(151 citation statements)

References 49 publications

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“…Plasmon tuning by the redox chemistry of Ag/AgCl spacers between Au nanoparticles has also been observed 10 . While such chemical transformations indeed modify the plasmons, few studies examine field-induced physical changes in the surface structural and electronic configurations.…”

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confidence: 89%

Tracking Nanoelectrochemistry Using Individual Plasmonic Nanocavities

et al. 2017

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We study in real time the optical response of individual plasmonic nanoparticles on a mirror, utilized as electrodes in an electrochemical cell when a voltage is applied. In this geometry, Au nanoparticles are separated from a bulk Au film by an ultrathin molecular spacer. The nanoscale plasmonic hotspot underneath the nanoparticles locally reveals the modified charge on the Au surface and changes in the polarizability of the molecular spacer. Dark-field and Raman spectroscopy performed on the same nanoparticle show our ability to exploit isolated plasmonic junctions to track the dynamics of nanoelectrochemistry. Enhancements in Raman emission and blue-shifts at a negative potential show the ability to shift electrons within the gap molecules.

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confidence: 89%

Tracking Nanoelectrochemistry Using Individual Plasmonic Nanocavities

et al. 2017

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“…7-10 As demonstrated via ensemble spectroscopy, nanoparticle plasmons report on their local dielectric environment (nanometer range), 11-13 and thus make ideal candidates for electrochemical reaction sensing. 4,10,[14][15][16][17][18][19][20] We seek to develop an optical method for monitoring electrochemical reactions at individual nanoparticles that would allow parallel monitoring of many nanoparticles in situ.Potential-controlled sulfate ion adsorption to gold is useful for demonstrating plasmonbased sensing because there are multiple benchmark examples. Bulk spectroelectrochemical methods have been successful in sensing sulfate adsorption on planar gold electrodes via second harmonic generation (SHG), 21 two dimensional Fourier transform infrared spectroscopy (2D FTIR), 22 and surface enhanced Raman spectroscopy (SERS).…”

mentioning

confidence: 99%

“…[7][8][9][10] As demonstrated via ensemble spectroscopy, nanoparticle plasmons report on their local dielectric environment (nanometer range), [11][12][13] and thus make ideal candidates for electrochemical reaction sensing. 4,10,[14][15][16][17][18][19][20] We seek to develop an optical method for monitoring electrochemical reactions at individual nanoparticles that would allow parallel monitoring of many nanoparticles in situ.…”

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confidence: 99%

Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

et al. 2016

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Nanoparticle and thin film surface plasmons are highly sensitive to electrochemically induced dielectric changes. We exploited this sensitivity to detect reversible electrochemical potential-driven anion adsorption by developing single-particle plasmon voltammetry (spPV) using plasmonic nanoparticles. spPV was used to detect sulfate electroadsorption to individual Au nanoparticles. By comparing both semiconducting and metallic thin film substrates with Au nanoparticle monomers and dimers, we demonstrated that using Au film substrates improved the signal in detecting sulfate electroadsorption and desorption through adsorbate modulated thin film conductance. Using single-particle surface plasmon spectroscopic techniques, we constructed spPV to sense sulfate, acetate, and perchlorate adsorption on coupled Au nanoparticles. spPV extends dynamic spectroelectrochemical sensing to the single-nanoparticle level using both individual plasmon resonance modes and total scattering intensity fluctuations.

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“…From this viewpoint, structural control via chemical reactions is considered to be a promising method. Reversible switching of the optical properties of core–shell nanoparticles was achieved via the electrochemical method . The electrochemical redox reaction of Cl at the surfaces of Au/Ag core–shell nanoparticles was controlled to produce a dramatic change in their optical properties.…”

Section: Control Of the Plasmonic Structuresmentioning

confidence: 99%

“…Reversible switching of the opticalp roperties of coreshell nanoparticles was achievedv ia the electrochemical method. [90] The electrochemical redox reaction of Cl at the surfaces of Au/Ag core-shell nanoparticles wasc ontrolled to produce ad ramatic change in their optical properties.W ith the formation of AgCl on the surfaces of Au nanoparticles, the scattering intensity becames trongera nd the resonance wavelength shifted slightly to al ower energy.I na ddition, changes in the CTP modes that were dependent on the deposition of AgCl were also discussed. Recently,w eh ave performed electrochemical underpotentiald eposition of Cu on the surfaces of Au bridged structures.…”

Section: Atomicscale Control Of the Metal Nanostructuresmentioning

confidence: 99%

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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From tunable core-shell nanoparticles to plasmonic drawbridges: Active control of nanoparticle optical properties

Abstract: Redox electrochemistry was used to reversibly tune the optical properties of plasmonic core-shell nanoparticles and dimers.

Cited by 161 publications

References 49 publications

Tracking Nanoelectrochemistry Using Individual Plasmonic Nanocavities

Tracking Nanoelectrochemistry Using Individual Plasmonic Nanocavities

Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

Plasmonic Fields Focused to Molecular Size

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