Release Mechanism of Octadecyl Rhodamine B Chloride from Au Nanorods by Ultrafast Laser Pulses

Alper, Joshua; Crespo, Monica P.; Hamad‐Schifferli, Kimberly

doi:10.1021/jp809646e

Cited by 29 publications

(25 citation statements)

References 40 publications

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“…3a, plasmon excitation at the resonance frequency can be used in a selective way such that undesired assemblies are dissociated due to the photothermal effect while leaving desired (offresonance) ones intact. Meanwhile, the released linker molecules could induce dimer recombination through an electrostatic interaction 29,30 . Under these conditions, dimers with the correct offset will be formed, because the laser irradiation prevents the growth of undesired dimers.…”

mentioning

confidence: 99%

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Yang

Yin

et al. 2014

Nature Nanotech

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Thermodynamically driven self-assembly offers a direct route to organize individual nanoscopic components into threedimensional structures over a large scale [1][2][3] . The most thermodynamically favourable configurations, however, may not be ideal for some applications. In plasmonics, for instance, nanophotonic constructs with non-trivial broken symmetries can display optical properties of interest, such as Fano resonance, but are usually not thermodynamically favoured 4 . Here, we present a self-assembly route with a feedback mechanism for the bottom-up synthesis of a new class of symmetry-breaking optical metamaterials. We self-assemble plasmonic nanorod dimers with a longitudinal offset that determines the degree of symmetry breaking and its electromagnetic response. The clear difference in plasmonic resonance profiles of nanorod dimers in different configurations enables high spectra selectivity. On the basis of this plasmonic signature, our self-assembly route with feedback mechanism promotes the assembly of desired metamaterial structures through selective excitation and photothermal disassembly of unwanted assemblies in solution. In this fashion, our method can selectively reconfigure and homogenize the properties of the dimer, leading to highly monodispersed aqueous metamaterials with tailored symmetries and electromagnetic responses.In the last decade, control over structural symmetries has led to novel materials properties and the prediction of potentially exciting applications. Optical metamaterials 5 , unlike conventional materials, can be designed to have negative refraction, rainbow trapping and nonlinear metal optics. However, particularly rich and exciting physics comes into play when symmetry-breaking mechanisms are introduced that have the potential to enable strong anisotropic plasmon hybridization 6 , leading to unusual phenomena including plasmon-induced transparency 7 , anti-Hermitian plasmonic antennas 8 and optical magnetism, and consequently negative-index metamaterials 9 . These intriguing properties can be used in a number of important applications, such as subwavelength imaging, optical cloaking and sensing [10][11][12] . These applications could be hindered by the fact that most structures are fabricated predominantly by top-down lithography, a technique that is inefficient for producing isotropic metamaterials in three dimensions and is often not cost-effective for large-scale fabrication. To mitigate these limitations, self-assembly approaches have recently been explored. However, they generate the most thermodynamically favourable structure, which usually results in a high degree of structural symmetry and inevitable inhomogeneity. For example, such self-assembly methods have been used to synthesize symmetric coupled plasmonic nanoclusters on a substrate 13 . Very recently, assisted by DNA or polystyrene-particle scaffolds, a circular dichroic plasmonic cluster and optical metafluid with high symmetry have also been reported 14,15

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confidence: 99%

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Yang

Yin

et al. 2014

Nature Nanotech

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“…Femtosecond laser pulses were used to achieve R 18 release by exchange with free CTAB from the surrounding solution. This process was reversible; however, a sufficiently high laser fluence (>220 μJ cm −2 ) melted the nanoparticles so that there was no subsequent release 69. In an analogous approach, thiol‐modified sense nucleotides were bound to the surface of nanorods and hybridized with antisense DNA, RNA, or siRNA oligonucleotides.…”

Section: Near‐ir Triggeringmentioning

confidence: 99%

Remotely Triggerable Drug Delivery Systems

2010

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Triggerable drug delivery systems enable on-demand controlled release profiles that may enhance therapeutic effectiveness and reduce systemic toxicity. Recently, a number of new materials have been developed that exhibit sensitivity to visible light, near-infrared (NIR) light, ultrasound, or magnetic fields. This responsiveness can be triggered remotely to provide flexible control of dose magnitude and timing. Here we review triggerable materials that range in scale from nano to macro, and are activated by a range of stimuli.

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“…Rhodamine B (RhB) was adsorbed on Au NRs as described elsewhere (Alper et al, 2009). Briefly, 1:50 of 20 mM RhB solution was shaken overnight with 1 mL solution of Au NRs.…”

Section: Nr Uptakementioning

confidence: 99%

Laser exposure of gold nanorods can increase neuronal cell outgrowth

Paviolo

Haycock

Yong

et al. 2013

Biotech & Bioengineering

100

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The usage of gold nanoparticles (Au NPs) in biological applications has risen significantly over the last 10 years. With the wide variety of chemical and biological functionalization available and their distinctive optical properties, Au NPs are currently used in a range of biological applications including sensing, labeling, drug delivery, and imaging applications. Among the available particles, gold nanorods (Au NRs) are particularly useful because their optical absorption can be tuned across the visible to near infrared region. Here, we present a novel application of Au NRs associated with low power laser exposure of NG108-15 neuronal cells. When cells were irradiated with a 780 nm laser, the average number of neurons with neurites increased. A similar stimulatory effect was observed for cells that were cultured with poly-(4-styrenesulfonic acid)-coated and silica-coated Au NRs. Furthermore, when the NG108-15 cells were cultured with both bare and coated Au NRs and then irradiated with 1.2-7.5 W/cm(2) at 780 nm, they showed a neurite length increase of up to 25 µm versus control. To the best of our knowledge, this effect has never been reported before. While the pathways of the stimulation is not yet clear, the data presented here demonstrates that it is linked to the absorption of light by the Au NRs. These initial results open up new opportunities for peripheral nerve regeneration treatments and for novel approaches to addressing central nervous system axons following spinal cord injury.

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Release Mechanism of Octadecyl Rhodamine B Chloride from Au Nanorods by Ultrafast Laser Pulses

Cited by 29 publications

References 40 publications

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Remotely Triggerable Drug Delivery Systems

Laser exposure of gold nanorods can increase neuronal cell outgrowth

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