Plasmon Resonance Shifts of Au-Coated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Au</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>S</mml:mi></mml:math>Nanoshells: Insight into Multicomponent Nanoparticle Growth

Averitt, R. D.; Sarkar, Dipankar; Halas, Naomi J.

doi:10.1103/physrevlett.78.4217

Cited by 643 publications

(503 citation statements)

References 10 publications

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“…UV-Vis spectroscopy of the aqueous solution of PEG coated SPIO-Au nanoshells showed that the surface plasma band of the nanoshells peaked at around 825-910 nm (Fig. 3), more than 300 nm towards the infrared compared to the peak for conventional gold nanoparticles 22 . Theoretical calculations have shown that the plasmon resonance of noble metal nanoshells can vary over hundreds of nanometers, the position of the resonance dictated by both the shell thickness and the size of the dielectric core 22 .…”

Section: Synthesis and Peg Coating Of Spio-au Nanoshellsmentioning

confidence: 97%

Bifunctional Gold Nanoshells with a Superparamagnetic Iron Oxide−Silica Core Suitable for Both MR Imaging and Photothermal Therapy

et al. 2007

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We describe the synthesis, characterization, and use of hybrid nanoparticles with a superparamagnetic iron oxide (SPIO) core and a gold nanoshell. These multifunctional nanoparticles, designated SPIO-Au nanoshells, displayed superparamagnetic characteristics and a significant absorbance in the near-infrared (NIR) region of the electromagnetic spectrum. In addition, they exhibited high transverse relaxivity, r 2 , and a large r 2 /r 1 ratio and therefore could be imaged by MRI to obtain T 2 -weighted images. Moreover, SPIO-Au nanoshells showed efficient photo-thermal effect when exposed to NIR light. The use of SPIO-Au nanoshells, with their combination of unique magnetic and optical properties, should enhance the efficacy of nanoshellmediated photo-thermal therapy by making it possible to direct more nanoparticles to tumors through the application of external magnetic field and by permitting real-time in vivo MRI imaging of the distribution of the nanoparticles before, during, and after photo-thermal therapy.

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Section: Synthesis and Peg Coating Of Spio-au Nanoshellsmentioning

confidence: 97%

Bifunctional Gold Nanoshells with a Superparamagnetic Iron Oxide−Silica Core Suitable for Both MR Imaging and Photothermal Therapy

et al. 2007

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“…Halas and coworkers were among the first to prepare such materials and validate the calculations of Neeves and Birnboim. [12] Halas' approach was to coat silica or polymer beads with Au shells of variable thickness via a direct deposition/ chemical reduction method. [13] While this approach has been used as a general synthetic route to dielectric/metallic core-shell particles, the preparation of such composite structures is nontrivial, since most metals do not sufficiently wet the surface of an oxide or polymeric material.…”

Section: Introductionmentioning

confidence: 99%

Gold Nanocages for Biomedical Applications

et al. 2007

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Nanostructured materials provide a promising platform for early cancer detection and treatment.Here we highlight recent advances in the synthesis and use of Au nanocages for such biomedical applications. Gold nanocages represent a novel class of nanostructures, which can be prepared via a remarkably simple route based on the galvanic replacement reaction between Ag nanocubes and HAuCl 4 . The Au nanocages have a tunable surface plasmon resonance peak that extends into the near-infrared, where the optical attenuation caused by blood and soft tissue is essentially negligible. They are also biocompatible and present a well-established surface for easy functionalization. We have tailored the scattering and absorption cross-sections of Au nanocages for use in optical coherence tomography and photothermal treatment, respectively. Our preliminary studies show greatly improved spectroscopic image contrast for tissue phantoms containing Au nanocages. Our most recent results also demonstrate the photothermal destruction of breast cancer cells in vitro by using immuno-targeted Au nanocages as an effective photo-thermal transducer. These experiments suggest that Au nanocages may be a new class of nanometer-sized agents for cancer diagnosis and therapy.

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“…The peculiar characteristics of interaction of light with plasmonic nanoparticles have been known for a long time, and recently, owing to the advancement in nanofabrication technologies, the interest in the scattering resonance associated with the presence of plasmonic nanoparticles has been resurrected and explored in detail, both experimentally and theoretically. [2][3][4][5] The influence of the plasmonic nanoparticles on the single-molecule spontaneous emission has also been studied, where the stimulated molecule was modeled as a dipole source ͑see Refs. 6 and 7, and references therein͒.…”

Section: Introductionmentioning

confidence: 99%

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

2007

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A Yagi-Uda-like optical nanoantenna concept using resonant core-shell plasmonic particles as its "reflectors" and "directors" is studied numerically. Such particles when placed near an optical dipole source in a certain arrangement may exhibit large induced dipole moments, resulting in shaping the far-field radiation pattern, analogous to the far field of classical Yagi-Uda antennas in the microwave regime. The variation of the ratio of radii in concentric core-shell nanostructure is used to tailor the phase of the polarizabilities of the particles and, consequently, the antenna's far-field pattern. The idea of a nanospectrum analyzer is also briefly proposed for molecular spectroscopy.

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Plasmon Resonance Shifts of Au-CoatedAu2SNanoshells: Insight into Multicomponent Nanoparticle Growth

Cited by 643 publications

References 10 publications

Bifunctional Gold Nanoshells with a Superparamagnetic Iron Oxide−Silica Core Suitable for Both MR Imaging and Photothermal Therapy

Bifunctional Gold Nanoshells with a Superparamagnetic Iron Oxide−Silica Core Suitable for Both MR Imaging and Photothermal Therapy

Gold Nanocages for Biomedical Applications

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

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