Effect of Edge Rounding on the Extinction Properties of Hollow Metal Nanoparticles

Qian, Jun; Liu, Chen‐Xu; Wang, Wu-deng; Chen, Jing; Li, Yudong; Xu, Jingjun; Sun, Qian

doi:10.1007/s11468-013-9496-z

Cited by 16 publications

(14 citation statements)

References 44 publications

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“…In addition to the above-presented experimental results, several simulation studies by using DDA and FDTD have been conducted in order to understand the distribution of the plasmon resonances in individual or coupled hollow metal nanostructures [14,127,128,[166][167][168][169][170][171]. These simulation studies were usually used to explain the enhanced performance of the hollow nanostructures in applications like sensing and catalysis by revealing the distribution of plasmon resonances inside and around the nanostructures and calculating the generated electromagnetic fields [14,127,128].…”

Section: Ultralocal Plasmonic Propertiesmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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Section: Ultralocal Plasmonic Propertiesmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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“…To our knowledge, there is only one previous EELS study on polycrystalline nanoshells, 39 but none on high quality, single crystalline hollow nanostructures such as commonly used nanoboxes and nanocages. Nevertheless, there are several theoretical studies dealing with the LSPR properties of individual and coupled AuAg hollow nanostructures by discrete dipole approximation (DDA) simulations, 14,18,19,40 anticipating their enhanced properties; however, a detailed experimental characterization/ study at the nanoscale level along with a direct demonstration of their applicability is still missing in such advanced systems. 41 Label-free optical sensing with plasmonic nanoparticles is based on the detection of adsorbate induced refractive index changes near or on the nanoparticles, which change the dielectric constant of the surrounding medium and can be measured by using UV−visible extinction spectroscopy.…”

mentioning

confidence: 99%

Tuning the Plasmonic Response up: Hollow Cuboid Metal Nanostructures

et al. 2016

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We report the fine-tuning of the localized surface plasmon resonances (LSPRs) from ultraviolet to near-infrared by nanoengineering the metal nanoparticle morphologies from solid Ag nanocubes to hollow AuAg nanoboxes and AuAg nanoframes. Spatially resolved mapping of plasmon resonances by electron energy loss spectroscopy (EELS) revealed a homogeneous distribution of highly intense plasmon resonances around the hollow nanostructures and the interaction, that is, hybridization, of inner and outer plasmon fields for the nanoframe. Experimental findings are accurately correlated with the boundary element method (BEM) simulations demonstrating that the homogeneous distribution of the plasmon resonances is the key factor for their improved plasmonic properties. As a proof of concept for these enhanced plasmonic properties, we show the effective label free sensing of bovine serum albumin (BSA) of single-walled AuAg nanoboxes in comparison with solid Au nanoparticles, demonstrating their excellent performance for future biomedical applications.

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“…This would contribute to an even stronger blue-shift. 15,16 In Fig. 1, the gold nanoparticles appear to have facets at their edges.…”

Section: Results and Analysismentioning

confidence: 98%

“…They predict a blue shift of approximately 25 nm, for a cylinder with 50 nm diameter and 20 nm height, and a surface root mean square roughness going from 1.6 to 0 nm. Qian et al 15 calculate theoretically that the extinction spectrum blue shift for hollow gold cubes when the corners are rounded. Liu et al 16 show the same for bipyramids when the tips are rounded using finite-difference time-domain (FDTD) simulations; the absorption peak is shifted 40 nm by a change in the radius of curvature from 4.4 to 2.0 nm.…”

Section: Introductionmentioning

confidence: 99%

Temperature induced color change in gold nanoparticle arrays: Investigating the annealing effect on the localized surface plasmon resonance

Holm

Greve

Holst

2016

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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The localized surface plasmon resonance (LSPR) effect in metal nanoparticles is important for a range of applications, including photovoltaics and sensors. The actual LSPR effect is difficult to predict, because it can vary strongly with the size, shape, surface structure, and surrounding media of the nanoparticles. In order to understand this better, more experimental data are needed. Here, the authors present a study of the LSPR effect in macroscopic two-dimensional square arrays of gold nanoparticles, 50-80 nm in diameter with a pitch of approximately 160 nm, fabricated on borosilicate substrates. The arrays were exposed to different annealing temperatures in steps of 50 up to 600 C. The authors observe an irreversible blue-shift of the LSPR extinction peak, from around 580 to around 520 nm at annealing temperatures of only 450 C, an effect clearly visible to the naked eye. The authors also present measurements of the shape of the nanoparticles at the different annealing steps. These measurements were obtained using a combination of scanning electron microscopy (SEM) and atomic force microscopy (AFM). A carefully indexed pattern allowed us to measure the exact same nanoparticles with separate AFM and SEM instruments. The only clear effect that can be observed is that the nanoparticles appear to get smoother with annealing. Our results demonstrate that seemingly minor changes in the metal nanoparticle appearance can lead to a strong change in the LSPR effect. Our results also open up for potential applications in temperature sensing. The fact that the effect of temperature exposure can be observed with the naked eye without any need of electronic readout or power supply is particularly advantageous.

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Effect of Edge Rounding on the Extinction Properties of Hollow Metal Nanoparticles

Cited by 16 publications

References 44 publications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Tuning the Plasmonic Response up: Hollow Cuboid Metal Nanostructures

Temperature induced color change in gold nanoparticle arrays: Investigating the annealing effect on the localized surface plasmon resonance

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