Journal ArticleDOI
Gold nanoshells on polystyrene cores for control of surface plasmon resonance.
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TLDR
By variation of the relative sizes of the latex core and the thickness of the gold overlayer, the plasmon resonance of the nanoshell can be tuned to specific wavelengths across the visible and infrared range of the electromagnetic spectrum, for applications ranging from the construction of photonic crystals to biophotonics.Abstract:
A method is presented for synthesizing core-shell structures consisting of monodisperse polystyrene latex nanospheres as cores and gold nanoparticles as shells. Use of polystyrene spheres as the core in these structures is advantageous because they are readily available commercially in a wide range of sizes, and with dyes or other molecules doped into them. Gold nanoparticles, ranging in size from 1 to 20 nm, are prepared by reduction of a gold precursor with sodium citrate or tetrakis(hydroxymethyl)phosphonium chloride (THPC). Carboxylate-terminated polystyrene spheres are functionalized with 2-aminoethanethiol hydrochloride (AET), which forms a peptide bond with carboxylic acid groups on their surface, resulting in a thiol-terminated surface. Gold nanoparticles then bind to the thiol groups to provide up to about 50% coverage of the surface. These nanoparticles serve as seeds for growth of a continuous gold shell by reduction of additional gold precursor. The shell thickness and roughness can be controlled by the size of the nanoparticle seeds as well as by the process of their growth into a continuous shell. By variation of the relative sizes of the latex core and the thickness of the gold overlayer, the plasmon resonance of the nanoshell can be tuned to specific wavelengths across the visible and infrared range of the electromagnetic spectrum, for applications ranging from the construction of photonic crystals to biophotonics. The position and width of the plasmon resonance extinction peak are well-predicted by extended Mie scattering theory.read more
Citations
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Journal ArticleDOI
Templated Techniques for the Synthesis and Assembly of Plasmonic Nanostructures
Journal ArticleDOI
Gold Nanomaterials at Work in Biomedicine
Journal ArticleDOI
The plasmon band in noble metal nanoparticles: an introduction to theory and applications
Audrey Moores,Frédéric Goettmann +1 more
TL;DR: In this paper, the authors present a comprehensible overview of the fundamentals of the theories explaining the plasmon band phenomenon and a brief review of relevant literature with reference to the aforementioned theory.
Journal ArticleDOI
Optical properties and biomedical applications of plasmonic nanoparticles
TL;DR: This work discus basic wet-chemical routes to fabricate conjugates of gold, silver, or composite particles with controllable size, shape, structure and with surface functionalization by biospecific molecules and application of plasmonic bioconjugates to such fields as homogeneous and solid-phase assays, biomedical sensing and imaging, biodistribution and toxicity aspects, drug delivery and plAsmonic photothermal therapy.
Journal ArticleDOI
Plasmonics in Biology and Plasmon-Controlled Fluorescence
TL;DR: It appears possible that the use of plasmon-controlled fluorescence will allow construction of wide-field optical microscopy with subwavelength spatial resolution down to 25 nm, and it is predicted that PCF will result in a new generation of probes and devices.
References
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Journal ArticleDOI
Nanoshell-mediated near-infrared thermal therapy of tumors under magnetic resonance guidance
Leon R. Hirsch,R.J. Stafford,James A. Bankson,S.R. Sershen,Belinda Rivera,Roger E. Price,John D. Hazle,Nancy J. Halas,Jennifer L. West +8 more
TL;DR: In vivo studies under magnetic resonance guidance revealed that exposure to low doses of NIR light in solid tumors treated with metal nanoshells reached average maximum temperatures capable of inducing irreversible tissue damage, and found good correlation with histological findings.
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A hybridization model for the plasmon response of complex nanostructures.
TL;DR: A simple and intuitive picture that describes the plasmon response of complex nanostructures of arbitrary shape is presented, an electromagnetic analog of molecular orbital theory, that can be understood as the interaction or "hybridization" of elementary plasmons supported by nanostructure of elementary geometries.
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Nanoengineering of particle surfaces.
TL;DR: In this article, the authors present the state-of-the-art in strategies for engineering particle surfaces, such as the layer-by-layer deposition process, which allows fine control over shell thickness and composition.
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Nanoengineering of optical resonances
TL;DR: In this paper, a general approach to the making of metal nanoshell composite nanoparticles based on molecular self-assembly and colloid reduction chemistry is described, which can be used to construct a new, composite nanoparticle whose optical resonance can be designed in a controlled manner.
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Synthesis and reactions of functionalised gold nanoparticles
TL;DR: Stable functionalised gold nanoparticles are prepared by simultaneous reduction of tetrachloroaurate ions and attachment of bifunctional organic thiol molecules to the growing gold nuclei leading to a material whose chemical behaviour is characterised by the vacant functionality of the bifunctionsal thiol ligand.