Multipole Plasmon Resonances of Submicron Silver Particles

Kumbhar, Amar; Kinnan, Mark K.; Chumanov, George

doi:10.1021/ja053242d

Cited by 200 publications

(180 citation statements)

References 24 publications

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“…To study the influence of the dielectric environment, we consider NPs of different morphologies embedded in a medium with a refraction index n = 1.47, such as dimethyl sulfoxide (DMSO) or silica glass, and then, we compare the spectra with those in vacuum. In the case of silver, many results indicate the presence of polyhedral NPs with well-defined facets and vertices, like icosahedra, and decahedra, as well as fcc related morphologies like cubes and truncated cubes [17,18,[32][33][34][35][36][37][38]. Figure 1 shows the different structural motifs studied here.…”

Section: Resultsmentioning

confidence: 99%

Optical properties of silver nanoparticles

González

Noguez

2007

Phys. Status Solidi (c)

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The optical response of embedded silver nanoparticles in terms of their morphology and dielectric environment is studied. Employing a discrete dipole approximation, the extinction efficiencies are calculated for nanoparticles of different shapes and in diverse ambient conditions. A clear dependence of the number, width and position of the surface plasmon resonances (SPRs) is identified for various nanoparticle shapes. For faceted particles, it is found that as the truncation of sides increases, the main resonance is always blue shifted, the SPRs at smaller wavelength are closer to the dominant mode, so, they overlap, and the width of the main resonance increases. The SPRs vanish as the number of faces increases, or when the symmetry of the NP becomes larger. As the vertices become sharper, the number of resonances increases significantly. By changing the refraction index of the environment, the number of SPRs is not affected, although their width and position are modified, so that, for larger the refraction indeces the resonances are red shifted.

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Section: Resultsmentioning

confidence: 99%

Optical properties of silver nanoparticles

González

Noguez

2007

Phys. Status Solidi (c)

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“…In Figure 5, the UV/Vis spectra of the solution corresponding to the particles of 1 and 4 nm show the presence, in both cases, of the SPR at 392 and 434 nm, respectively. This significant shift must be a direct consequence of the different particle sizes [15] and/or their different dielectric surrounding media: the lower the Ag particle size, the less contact with the apoferritin takes place. In fact, particles of 1 nm exhibit a SPR (392 nm) that is typical for uncoated Ag nanoparticles, whereas that (434 nm) of the 4-nm sized particle is more characteristic of Ag particles surrounded with a high refractive index shell.…”

Section: Resultsmentioning

confidence: 99%

Size‐Controlled Water‐Soluble Ag Nanoparticles

et al. 2007

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Ag nanoparticles of two different sizes (1 and 4 nm) were prepared within an apoferritin cavity by using an Ag+‐loaded apoferritin as a nanoconfined environment for their construction. The initial amount of Ag+ ions injected in the apoferritin cavity dictates the size of the final Ag particles. The protein shell prevents bulk aggregation of the metal particles, which renders them water soluble and extremely stable.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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“…Calculations have shown that as silver nanoprisms get even larger, higher order multipole resonances should become visible [3,59] Higher order multipole resonances in nanorods are well documented [60][61][62] and have also been observed in silver nanospheres. [63] A closer look at some of the spectra for the samples of our largest nanoprisms show a shoulder on the in-plane quadrupole resonance at $465 nm (Fig. S2, SI).…”

Section: Optical Propertiesmentioning

confidence: 91%

Optical Properties and Growth Aspects of Silver Nanoprisms Produced by a Highly Reproducible and Rapid Synthesis at Room Temperature

Aherne

Ledwith

Gara

et al. 2008

Adv Funct Materials

481

502

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A rapid and readily reproducible seed‐based method for the production of high quality silver nanoprisms in high yield is presented. The edge‐length and the position of the main plasmon resonance of the nanoprisms can be readily controlled through adjustment of reaction conditions. From UV‐vis spectra of solutions of the nanoprisms, the inhomogeneously broadened line width of the in‐plane dipole plasmon resonance is measured and trends in the extent of plasmon damping as a function of plasmon resonance energy and nanoprism size have been elucidated. In addition, an in‐depth analysis of the lamellar defect structure of silver nanoprisms is provided that confirms that the defects can lead to a transformation of the crystal structure in the vicinity of the defects. These defects can combine give rise to lamellar regions, thicker than 1 nm, that extend across the crystal, where the silver atoms are arranged in a continuous hexagonal‐close‐packed (hcp) structure. This hcp structure has a periodicity of 2.50 Å, thus explaining the 2.50 Å lattice fringes that are commonly observed in 〈111〉 oriented flat‐lying nanoprisms. A new understanding of the mechanisms behind anisotropic growth in silver nanoprisms is presented.

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Multipole Plasmon Resonances of Submicron Silver Particles

Cited by 200 publications

References 24 publications

Optical properties of silver nanoparticles

Optical properties of silver nanoparticles

Size‐Controlled Water‐Soluble Ag Nanoparticles

Optical Properties and Growth Aspects of Silver Nanoprisms Produced by a Highly Reproducible and Rapid Synthesis at Room Temperature

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