Second harmonic generation response by gold nanoparticles at the polarized water/2-octanone interface: from dispersed to aggregated particles

Galletto, Paolo; Gomis-Bas, C.; Schiffrin, David J.; Antoine, Rodolphe; Broyer, M.; Brevet, Pierre‐François

doi:10.1088/0953-8984/19/37/375108

Cited by 20 publications

(17 citation statements)

References 20 publications

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“…In order to optimize HGN use in SERS based applications it is critical to understand the effect of their structure, size, and aggregation on EM field enhancement. In general, aggregation intensifies the second harmonic generation of HGNs in contact with one another, effectively combining their collective energy to generate new photons with twice the frequency and half the wavelength [292][293][294][295]. HGN aggregates are also known to exhibit both hybridized plasmon modes, which are the result of surface plasmon interactions with cavity plasmon modes, and collective charge transfer resonances [296][297][298].…”

Section: Plasmon Coupling In Aggregates For Sersmentioning

confidence: 99%

Unique optical properties and applications of hollow gold nanospheres (HGNs)

Adams

Zhang

2016

Coordination Chemistry Reviews

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The field of plasmonics is driven by the investigation of the interaction between the electromagnetic (EM) field (light) and metal nanostructures. In particular, noble metal nanoparticles have been studied extensively due to their interesting surface plasmon resonance (SPR) properties and related applications. Tuning of the SPR position in energy is possible through synthetic variation in size, shape, aspect ratio, the dielectric constant of the surrounding media, surface morphology and whether particles are aggregated. One unique metal structure capable of meeting a wide range of criteria for multiple applications calling for enhanced EM field is the hollow gold nanosphere (HGN). HGNs have hollow solvent filled dielectric cores and polycrystalline gold shells that, due to the two surfaces or interfaces, can generate enhanced EM field. They possess a unique combination of properties that include small size (20-125 nm), large surface to volume (S/V) ratios, spherical shape, narrow and tunable SPR (~520-1000 nm) and biocompatibility. Their surfaces can also be easily functionalized to target and deliver biomolecules and are resistant to photobleaching. Additionally their scattering and absorption cross-sections can be tailored, making them excellent candidates for a variety of applications including surface enhanced Raman scattering (SERS), sensing, imaging, drug delivery, site specific silencing and photothermal therapies (PTTs). This review will provide a perspective on the continued investigation of the plasmonic properties associated with HGNs and how these properties can be refined and harnessed for emerging applications.

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Section: Plasmon Coupling In Aggregates For Sersmentioning

confidence: 99%

Unique optical properties and applications of hollow gold nanospheres (HGNs)

Adams

Zhang

2016

Coordination Chemistry Reviews

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“…Furthermore, fluorescence loss induced by photobleaching and fluorescence recovery after photobleaching on the same system revealed that the lateral diffusion of these assemblies is 4 orders of magnitude slower than its bulk counterpart. 36 Second harmonic generation, 37 surface plasmon resonance 38 and ellipsometry 39 have also been shown as a characterization method for NPs at the LLI. More recently, freezefracture shadow-casting cryo SEM has been performed with single-particle resolution of these assemblies.…”

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confidence: 99%

Plasmonic Ruler at the Liquid–Liquid Interface

et al. 2012

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We report on a simple, fast, and inexpensive method to study adsorption and desorption of metallic nanoparticles at a liquid/liquid interface. These interfaces provide an ideal platform for the formation of two-dimensional monolayers of nanoparticles, as they form spontaneously, cannot be broken, and are defectcorrecting, acting as 2D 'nanoparticle traps'. Such two-dimensional self-assembled nanoparticle arrays have a vast range of potential applications in displays, catalysis, plasmonic rulers, optoelectronics, sensors and detectors. Here, we show that 16 nm diameter gold nanoparticles can be controllably adsorbed to a water/1,2-dichloroethane interface, and we can direct the average inter-particle spacing at the interface over the range 6-35 nm. The particle density and average inter-particle spacing are experimentally assessed by measuring the optical plasmonic response of the nanoparticles in the bulk and at the interface, and by comparing the experimental data with existing theoretical results.Keywords: liquid-liquid interface, Plasmonic Ruler, Nanoparticles, Self Assembly, Centrifugation. Nanoparticle (NP) adsorption at liquid-liquid interfaces (LLI) is a well established phenomenon that was first reported independently more than a century ago by Ramsden and Pickering. 1, 2 More recently, plasmonic NPs at LLIs have been reported to possess novel "metal liquid like" properties 3 that have sparked a renewed interest. Driven by the growing need for cheap, fast and reproducible bottom-up assembly for nanotechnological applications, the unique optical, 4 magnetic, 5 electrical 6 and chemical 7 properties of such films has attracted intensive research in a rapidly growing field.NP assemblies at LLIs hold great promise in diverse fields ranging from electrovariable optics 8 to templates for hierarchical self assembly, 9 and plasmonic rulers. 10 One of the main benefits of localising NPs at a LLI for these applications is the aforementioned self-assembly. 11 Currently, most technological applications of nanoassemblies are based around solid-state fabrication. Although the control that the solid interface offers is unparalleled, it does have several drawbacks when compared to a LLI. One such drawback is topological defects -these can be introduced either during or post-manufacturing and are extremely difficult to correct. In fact it is often easier to fabricate a new device rather than attempting to repair defects. Conversely, a LLI system has the ability to self-correct without any external manipulation. 12 An additional drawback of a solid state system becomes clear when introducing the exciting concept of a plasmonic ruler. [13][14][15] The coupling between excitations of localized plasmons in NPs can allow for precise spatial information. This concept has been demonstrated between 2D arrays, 10 particle dimers 14 at solid interfaces and tethered NPs in bulk solution. 16 It has even been recently demonstrated to provide 3-dimensional structural information. 17 The use of plasmonic particles at the LLI sh...

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“…In general, aggregation intensifies the second harmonic generation of HGNs in contact with one another, effectively combining their collective energy to generate new photons with twice the frequency and half the wavelength [292][293][294][295]. HGN aggregates are also known to exhibit both hybridized plasmon modes, which are the result of surface plasmon interactions with cavity plasmon modes, and collective charge transfer resonances [296][297][298].…”

Section: Plasmon Coupling In Aggregates For Sersmentioning

confidence: 99%

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

2016

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By electrodeposition and galvanic replacement reaction, we developed a facile, time-saving, cost-effective, and environmentally friendly, two-step synthesis route to obtain a controllable cobalt oxide/Au hierarchically nanostructured electrode for glucose sensing. The nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy, meanwhile, the sensing performance was investigated by cyclic voltammetry and amperometric response. The results revealed that this novel electrode exhibited excellent electrocatalytic performance toward glucose oxidation, with a wide double-linear range from 0.2 μM to 20 mM and a low detection limit of 0.1 μM based on a signal-to-noise ratio of 3, which was mainly attributed to the ability of loading a small amount of Au with good electron conductivity on the surface of cobalt oxide nanosheets with large active surface area and synergistic electrocatalytic activity of Au and cobalt oxide toward glucose electrooxidation. This facile, sensitive, and selective glucose sensor is also proven to be suitable for the detection of glucose in human serum.

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Second harmonic generation response by gold nanoparticles at the polarized water/2-octanone interface: from dispersed to aggregated particles

Cited by 20 publications

References 20 publications

Unique optical properties and applications of hollow gold nanospheres (HGNs)

Unique optical properties and applications of hollow gold nanospheres (HGNs)

Plasmonic Ruler at the Liquid–Liquid Interface

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

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