Substrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters

Wang, Yumin; Li, Ziwei; Zhao, Kaiguang; Sobhani, Ali; Zhu, Xing; Fang, Zheyu; Halas, Naomi J.

doi:10.1039/c3nr02835f

Cited by 47 publications

(52 citation statements)

References 38 publications

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“…Unlike the semiconducting ITO substrate, the metallic Au thin film supports optical frequency electrical currents, 68 which allows Au dimers to be in conductive contact and permits the formation of charge transfer plasmon modes between the strongly coupled nanoparticles. 25 The lowest energy charge transfer mode, as observed for the monomer, is outside our detection window. However, the ~ 100 meV blueshift of the low energy resonance compared to the longitudinal bonding mode of the capacitively coupled dimer on the ITO film is indicative of a longitudinal screened bonding (SB) dipolar plasmon, consistent with calculations performed on touching Au nanoparticle dimers.…”

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confidence: 92%

“…23 In the case of nanoparticle plasmon probes, anion adsorption on single nanoparticle surfaces has been detected through changes in nanoparticle plasmon resonances. 4,5,14 Based on previous work on the role of substrates in the engineering of plasmonic nanoparticles [24][25][26][27] (through interaction of multiple nanoparticles and substrate material) and plasmonic sensing applications, [28][29][30][31] we hypothesize that the optoelectronic and electrochemical properties of the substrate may also play an important role in single-nanoparticle plasmonic electrochemical sensing.…”

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confidence: 99%

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

et al. 2016

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“…[1][2][3][4][5][6][7] According to NP free electron oscillating directions, the longitudinal LSPR spectra of gold nanorods (GNRs) is mainly dependent on the geometry dimensions. [8][9][10] Great efforts have been used to correlate the GNR geometry with unique spectral features.…”

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confidence: 99%

Fast characterization of gold nanorods ensemble by correlating its structure with optical extinction spectral features

Hu¹,

Hou²,

Ji³

et al. 2014

AIP Advances

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Owing to unique size- and shape- dependent localized surface plasmon resonance (LSPR) of noble metal nanoparticles (NPs), the optical extinction spectroscopy method (OES) has received much attention to characterize the geometry of metal NPs by fitting experimental UV-vis-NIR spectra. In this work, we aimed to develop a more convenient and accurate OES method to characterize the structural parameters and concentration of the gold nanorods (GNRs) ensemble. The main difference between our approach and previous OES methods is that we solve this inverse spectra problem by establishing the LSPR relation equations of GNRs ensemble so that there is no need of UV-vis-NIR spectra fitting process. The aspect ratio (AR) and AR distribution can be directly retrieved from two of UV-vis-NIR spectral parameters (peak position and full width at half maximum) using the obtained relation equations. Furthermore, the relation equations are modified for applying to the more general GNRs samples by considering the plasmon shift due to the near distance dielectric sensitivity. Finally, instead of inductively coupled plasma mass spectrometry (ICP-MS) measurement, we provide a more facile measure of the mass-volume concentration which can be determined from the extinction value at 400 nm. By comparing with the experimental results, it shows that the retrieved results by the relation equations are reliable.

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“…Fig. 2b shows a high density monolayer of gold nanoparticles on the surface of the graphene devices 19 nanoclusters, have a much larger absorption cross section, which provides larger field enhancements and multiple hot spots [41][42][43][44][45] . The heptamer-based graphene photodetector is shown in Fig.…”

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confidence: 99%

Plasmon-enhanced photodetection in nanostructures

Bao

2015

Nanotechnology Reviews

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Typical plasmonic nanostructures for the enhancement of photodetection in graphene and other semiconductor materials are reviewed. AbstractPhotodetection which converts the light into electric current, has significant importance in modern physics. For graphene photodetector, the performance is mainly limited by its low external quantum efficiency, mainly due to its poor light absorption properties. While for semiconductor photodetector, photocurrent generation is limited to photon energies above the band gap of the semiconductor. When metallic nanostructure is introduced, on one hand, the plasmon oscillations lead to a dramatic enhancement of the local electric field around graphene, resulting in a significant performance improvement of graphene photodetector, on the other hand, hot electrons from plasmon decay can transfer across the Schottky barrier at the metal-semiconductor interface, resulting in a photocurrent, which is no longer limited to photon energies greater than the band gap of the semiconductor, but rather to photon energies above the Schottky barrier height. Here, we review typical plasmonic nanostructures for the enhancement of photodetection in graphene and other semiconductor materials.

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Substrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters

Cited by 47 publications

References 38 publications

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

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

Fast characterization of gold nanorods ensemble by correlating its structure with optical extinction spectral features

Plasmon-enhanced photodetection in nanostructures

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