Fluorescence Enhancement of Molecules Inside a Gold Nanomatryoshka

Aqueous solutions containing light-absorbing nanoparticles have recently been shown to produce steam at high efficiencies upon solar illumination, even when the temperature of the bulk fluid volume remains far below its boiling point. Here we show that this phenomenon is due to a collective effect mediated by multiple light scattering from the dispersed nanoparticles. Randomly positioned nanoparticles that both scatter and absorb light are able to concentrate light energy into mesoscale volumes near the illuminated surface of the liquid. The resulting light absorption creates intense localized heating and efficient vaporization of the surrounding liquid. Light trapping-induced localized heating provides the mechanism for low-temperature light-induced steam generation and is consistent with classical heat transfer.

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“…(34,35) A detailed explanation of the synthesis of the gold nanomatryoshkas can also be found in recent literature. (28,29) …”

Section: Nanoparticle Synthesismentioning

confidence: 99%

Nanoparticles Heat through Light Localization

et al. 2014

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“…1Bi-iv). The synthesis developed here is modified from one reported previously to incorporate dyes within a plasmonic structure to enhance their fluorescence (23). Au nanoparticles of diameter 50 ± 4 nm ( Fig.…”

Section: Significancementioning

confidence: 99%

Enhancing T ₁ magnetic resonance imaging contrast with internalized gadolinium(III) in a multilayer nanoparticle

Marangoni

Neumann

Henderson

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Multifunctional nanoparticles for biomedical applications have shown extraordinary potential as contrast agents in various bioimaging modalities, near-IR photothermal therapy, and for lighttriggered therapeutic release processes. Over the past several years, numerous studies have been performed to synthesize and enhance MRI contrast with nanoparticles. However, understanding the MRI enhancement mechanism in a multishell nanoparticle geometry, and controlling its properties, remains a challenge. To systematically examine MRI enhancement in a nanoparticle geometry, we have synthesized MRI-active Au nanomatryoshkas. These are Au coresilica layer-Au shell nanoparticles, where Gd(III) ions are encapsulated within the silica layer between the inner core and outer Au layer of the nanoparticle (Gd-NM). This multifunctional nanoparticle retains its strong near-IR Fano-resonant optical absorption properties essential for photothermal or other near-IR light-triggered therapy, while simultaneously providing increased T 1 contrast in MR imaging by concentrating Gd(III) within the nanoparticle. Measurements of Gd-NM revealed a strongly enhanced T 1 relaxivity (r 1 ∼ 24 mM

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“…14,15,20,46 An example is the NMs of geometry (40,55,68) nm (gap size of 15 nm) from ref 14 (ii, Figure 2B). Their experimental extinction spectrum shows two intense and broad peaks at 622 and 943 nm (ii, Figure 2C).…”

Section: Nano Lettersmentioning

confidence: 99%

Nanooptics of Plasmonic Nanomatryoshkas: Shrinking the Size of a Core–Shell Junction to Subnanometer

et al. 2015

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Quantum effects in plasmonic systems play an important role in defining the optical response of structures with subnanometer gaps. Electron tunneling across the gaps can occur, altering both the far-field optical response and the near-field confinement and enhancement. In this study, we experimentally and theoretically investigate plasmon coupling in gold "nanomatryoshka" (NM) nanoparticles with different core−shell separations. Plasmon coupling effects between the core and the shell become significant when their separation decreases to 15 nm. When their separation decreases to below 1 nm, the near-and far-field properties can no longer be described by classical approaches but require the inclusion of quantum mechanical effects such as electron transport through the self-assembled monolayer of molecular junction. In addition, surface-enhanced Raman scattering measurements indicate strong electron-transport induced charge transfer across the molecular junction. Our quantum modeling provides an estimate for the AC conductances of molecules in the junction. The insights acquired from this work pave the way for the development of novel quantum plasmonic devices and substrates for surface-enhanced Raman scattering.

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Fluorescence Enhancement of Molecules Inside a Gold Nanomatryoshka

Cited by 199 publications

References 39 publications

Nanoparticles Heat through Light Localization

Nanoparticles Heat through Light Localization

Enhancing T ₁ magnetic resonance imaging contrast with internalized gadolinium(III) in a multilayer nanoparticle

Nanooptics of Plasmonic Nanomatryoshkas: Shrinking the Size of a Core–Shell Junction to Subnanometer

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Fluorescence Enhancement of Molecules Inside a Gold Nanomatryoshka

Cited by 199 publications

References 39 publications

Nanoparticles Heat through Light Localization

Nanoparticles Heat through Light Localization

Enhancing T 1 magnetic resonance imaging contrast with internalized gadolinium(III) in a multilayer nanoparticle

Nanooptics of Plasmonic Nanomatryoshkas: Shrinking the Size of a Core–Shell Junction to Subnanometer

Contact Info

Product

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Enhancing T ₁ magnetic resonance imaging contrast with internalized gadolinium(III) in a multilayer nanoparticle