Anisotropic Metal Nanoparticles:  Synthesis, Assembly, and Optical Applications

Murphy, Catherine J.; Sau, Tapan K.; Gole, Anand; Orendorff, Christopher J.; Gao, Junyuan; Gou, Linfeng; Hunyadi, Simona E.; Li, Tan

doi:10.1021/jp0516846

Cited by 2,873 publications

(2,253 citation statements)

References 179 publications

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“…The vibrational modes are normalized so that ∫ V |u n | 2 dV = 1. Given that displacements are infinitesimal within the framework of the theory of linear elasticity, the temporal response of the change in volume ΔV can be immediately calculated as 29 (2) where ΔV is the change in volume, V is the initial volume of the box and (3) where n̂ is the outward normal unit vector to the surface, and the integration is performed over all surfaces of the box.…”

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confidence: 99%

Vibrational Response of Au−Ag Nanoboxes and Nanocages to Ultrafast Laser-Induced Heating

Petrova

Lin

et al. 2007

Nano Lett.

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Time-resolved spectroscopy has been used to investigate the vibrational properties of hollow cubic nanoparticles: Au-Ag nanoboxes and nanocages. In these experiments laser-induced heating was used to coherently excite the breathing vibrational modes of the particle. The vibrational periods scale with the edge length of the particle, and the nanocages and nanoboxes showing equivalent responses despite a large difference in their morphology. The measured vibrational periods are compared to finite element calculations, where the particles are modeled as a hollow cube, with the principle crystal axes parallel to the sides of the cube. Very good agreement is obtained between the calculations and the experimental data, with the experimental frequencies being slightly lower than the calculated values (by ∼ 7 %). These results demonstrate the importance of accurately modeling the particles in order to interpret experimental data.Advances in synthetic techniques have made it possible to produce high quality samples of metal and semiconductor nanoparticles in a variety of different shapes, such as rods, 1,2,3 triangles, 4,5 cubes and boxes, 6 and branched structures. 7,8 These particles have unique optical properties, and are finding use in a variety of applications, from molecular sensing 9 to biological labeling 10 and photothermal therapy. 11,12 For metal particles the optical response is dominated by the surface plasmon resonance (SPR), which is a coherent oscillation of the conduction electrons across the particle surface. 13 Recent research has focused on understanding how the position and width of the SPR depends on the size and shape of the particles. 14 In this regard, single particle spectroscopy has been particularly useful. 15,16 These experiments have shown, for example, how radiation damping, 15,17 electron-surface scattering, 17,18 and the "lightning-rod effect" 19 control the width of the plasmon resonance.Time-resolved experiments also provide information about the properties of nanoparticles. For metals, transient absorption experiments conducted on a sub-picosecond timescale give information about electron-electron 20 and electron-phonon coupling. 21 At longer timescales (tens to hundreds of picoseconds) transient absorption measurements give data about how energy relaxes from the particle to the environment. 22,23 This information is important to photothermal therapy, where laser-induced heating of nanoparticles is used to kill selected cells. 11,12 For high quality samples, modulations due to coherently excited vibrational modes To obtain quantitative information from the vibrational spectroscopy experiments, an expression is needed that relates the measured frequencies to the particle dimensions and elastic constants. For spheres (both homogeneous and core-shell) and rods, analytic expressions are available for the important modes observed in the transient absorption experiments. 24,25,26, 27 However, for other shapes the vibrational modes must be calculated numerically. 28 In our recent stud...

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confidence: 99%

Vibrational Response of Au−Ag Nanoboxes and Nanocages to Ultrafast Laser-Induced Heating

Petrova

Lin

et al. 2007

Nano Lett.

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“…14 Two general strategies are used to shift the LSPR ratio into the NIR region: careful control of the aspect ratio for solid structures or fine-tuning of the wall thickness of hollow or core-shell structures. 14,[29][30][31] Morphological effects Commonly used morphologies. Fig.…”

Section: Localized Surface Plasmon Resonancementioning

confidence: 99%

Gold nanostructures: a class of multifunctional materials for biomedical applications

et al. 2011

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Gold nanostructures have proven to be a versatile platform for a broad range of biomedical applications, with potential use in numerous areas including: diagnostics and sensing, in vitro and in vivo imaging, and therapeutic techniques. These applications are possible because of the highly favorable properties of gold nanostructures, many of which can be tailored for specific applications. In the first part of this tutorial review, we will discuss the most critical properties of gold nanostructures for biomedical applications: surface chemistry, localized surface plasmon resonance (LSPR), and morphology. In the second part of the review, we will discuss how these properties can be harnessed for a selection of biomedical applications, aiming to give the reader an overview of general strategies as well as highlight some recent advances in this field.

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“…However, the extensive research recently on gold nanoparticles of more exotic shapes, e.g. nanorods [7], nanoshells [8] and 'caps' [9], has inspired us to consider whether these less-symmetrical gold nanoparticles might have applications in solar glazing. Unlike solid nanospheres or hemispheres, these shapes exhibit additional plasmon resonances that depend sensitively on their aspect ratios.…”

Section: Figurementioning

confidence: 99%

“…The basic recipe for making rods is now comparatively well understood [7,13], although there have been no attempts yet, as far as we are aware, to work out how to scale production up to commercially meaningful quantities. In the case of windows the next step after producing the rods is to fix them to the surface of the glass.…”

Section: Figurementioning

confidence: 99%

Spectrally-selective gold nanorod coatings for window glass

Gibbons²,

Cortie

2006

Gold Bull

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The unique optical properties of gold nanorods, which exhibit tuneable absorption as a function of their aspect ratio, suggest that they might have potential applications in coatings for solar control on windows. Here we explore the properties of coatings produced by attaching gold nanorods to the surface of glass. Such coatings can attenuate solar radiation effectively, even at very low gold contents, but the figure-of-merit, T vis /T sol , of our experimental coatings was close to unity, indicating that they are not spectrally selective, However, calculations are presented to show how coatings comprised of a blend of rods with aspect ratios of greater than 3 can produce coatings with T vis /T sol of up to at least 1.4. The maximum value possible for perfectly spectrallyselective coating in sunlight is 2.08. Unfortunately, the practical realization of such coatings requires the further development of reliable methods to scale up the production of gold nanorods of longer aspect ratios. Gold Bulletin 2006 • 39/4 156

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Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical Applications

Cited by 2,873 publications

References 179 publications

Vibrational Response of Au−Ag Nanoboxes and Nanocages to Ultrafast Laser-Induced Heating

Vibrational Response of Au−Ag Nanoboxes and Nanocages to Ultrafast Laser-Induced Heating

Gold nanostructures: a class of multifunctional materials for biomedical applications

Spectrally-selective gold nanorod coatings for window glass

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