Porous Au Nanoparticles with Tunable Plasmon Resonances and Intense Field Enhancements for Single-Particle SERS

Zhang, Qingfeng; Large, Nicolas; Nordlander, Peter; Wang, Hui

doi:10.1021/jz402795x

Cited by 171 publications

(182 citation statements)

References 39 publications

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“…The exact micorstructure of the nanosponges is very complex and a precise model with percolated porous structure for the simulation is very difficult to construct. A simplified model was constructed with a gold sphere etched by N randomly distributed spherical air pores [18,20,21]. Volume overlap is allowed between the air pores for the representation of the percolated structure.…”

Section: Large Tuneability Of Localized Surface Plasmon Resonancesmentioning

confidence: 99%

“…In addition to the large enhancement of local field, the gold nanosponges also exhibit a large tuneability of plasmonic resonances from visible to NIR range by controlling the porosity, particle size, particle form, and pore/ligament size [18][19][20]. The plasmonic properties can be tuned further by forming the structure of hybrid nanosponges [18,21].…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanosponges

Wang

Schaaf

2018

Advances in Physics: X

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Gold nanosponges, or nanoporous gold nanoparticles, possess a percolated nanoporous structure over the entire nanoparticles. The optical and plasmonic properties of gold nanosponges and its related hybrid nanosponges are very fascinating due to the unique structural feature, and are controllable and tuneable in a large scope by changing the structural parameters like pore/ligament size, porosity, particle size, particles form, and hybrid structure. The nanosponges show the strong polarization dependence and multiple resonances behavior. Besides, the nanosponges exhibit a significantly higher local field enhancement than the solid nanoparticles. Strong nonlinear optical properties are confirmed by their high-order photoemission behavior, whereby long-lived plasmon modes are also clearly observed. All this is very important and relevant for the applications in enhanced Raman scattering, fluorescence manipulation, sensing, and nonlinear photonics.

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Section: Large Tuneability Of Localized Surface Plasmon Resonancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasmonic nanosponges

Wang

Schaaf

2018

Advances in Physics: X

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“…Pure chemical techniques as seed-mediated growth, chemical vapor deposition or electrodeposition are suitable only for cheap inexpensive nanofabrication of disordered porous nanotextures and nanoparticles [31][32][33] , providing high controllability of geometric shapes and porosity, but requiring, however, additional pre-processing fabrication steps to arrange the isolated elements into their ordered arrays. Rapid laser-assisted thermal annealing and post-dealloying enable higher performance in comparison to the above mentioned approaches, requiring, on the other hand, additional steps in the processing chain, and, more importantly, often cause undesirable decrease of pore density 34,35 .…”

mentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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“…In the case of noble metal nanoparticles, no methods for the controlled synthesis of porous nanostructures have been established owing to the need for reducing-agent-mediated synthetic strategies and the importance of crystallinity. Nonetheless, because of the extremely high surface-to-volume ratios and structural advantages of porous nanostructures, the development of new synthetic methods for noble metals has been a subject of increasing interest [200][201][202][203][204][205][206][207][208][209][210][211]. The synthesis of porous Au nanoparticles using Ag nanospheres was first achieved through an extended synthetic strategy called inhibitory galvanic replacement.…”

Section: Porous Nanostructuresmentioning

confidence: 99%

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

Shin¹,

Kang²,

Jang³

2018

Preprint

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Owing to their unique physicochemical properties, nanoparticles are used in a variety of ways in the field of cancer treatment, including imaging, drug delivery, and photothermal and photodynamic therapies. The fascinating properties of nanoparticles are determined by their size, morphology, and constituent elements, and various synthetic methods and post-synthetic techniques have been applied to control these factors. Herein, we present examples of shape and composition control through galvanic replacement, a technique that exploits redox potential differences between elements to induce spontaneous ion-exchange and highlight its specific contributions to cancer treatment applications. The present article identifies the recent advances in nanoparticle formation techniques and discusses the future outlook of the field.

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Porous Au Nanoparticles with Tunable Plasmon Resonances and Intense Field Enhancements for Single-Particle SERS

Cited by 171 publications

References 39 publications

Plasmonic nanosponges

Plasmonic nanosponges

Fabrication of porous microrings via laser printing and ion-beam post-etching

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

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