Journal ArticleDOI
Unusual extinction spectra of nanometer-sized silver particles arranged in two-dimensional arrays
TLDR
In this paper, a blue shift and sharpening of the peak corresponding to the plasmon resonance was observed as the distance between particles decreased to a value comparable to, or less than, their diameter.Abstract:
Two-dimensional arrays of 1000 A silver particles were prepared by adsorption from colloidal suspensions onto glass slides derivatized with (3-mercaptopropyl)trimethoxysilane. By variation of the concentration of the colloidal suspensions, slides with different interparticle distances were obtained, and their extinction spectra were measured in water. A blue shift (up to 90 nm) and sharpening of the peak corresponding to the plasmon resonance was observed as the distance between particles decreased to a value comparable to, or less than, their diameter. The angular dependence of the extinction spectra was studied for s- and p-polarized light. The data are interpreted to result from coherent coupling of the plasmon resonances in closely spaced silver particles upon irradiation with light.read more
Citations
More filters
Journal ArticleDOI
Tailoring Surface Plasmons through the Morphology and Assembly of Metal Nanoparticles
TL;DR: The optical properties of noble metal nanoparticles, specifically gold, silver, and their combinations, prepared in solution through colloid chemical methods are shown to be mainly influenced by the surface plasmon resonance of conduction electrons.
Journal ArticleDOI
Toxicity Assessments of Multisized Gold and Silver Nanoparticles in Zebrafish Embryos
TL;DR: It is proposed that nanoparticle chemistry is as, if not more, important than specific nanosizes at inducing toxicity in vivo and should lead to the identification of nanomaterial characteristics that afford minimal or no toxicity and guide more rational designs of materials on the nanoscale.
Journal ArticleDOI
The Extinction Spectra of Silver Nanoparticle Arrays: Influence of Array Structure on Plasmon Resonance Wavelength and Width†
TL;DR: In this article, the extinction spectra of one-dimensional linear chains and two-dimensional planar arrays of spherical silver nanoparticles were studied, with the focus on the variation of the plasmon resonance wavelength and width with array structure (spacing, symmetry, particle size, and direction).
Journal ArticleDOI
Optical properties and biomedical applications of plasmonic nanoparticles
TL;DR: This work discus basic wet-chemical routes to fabricate conjugates of gold, silver, or composite particles with controllable size, shape, structure and with surface functionalization by biospecific molecules and application of plasmonic bioconjugates to such fields as homogeneous and solid-phase assays, biomedical sensing and imaging, biodistribution and toxicity aspects, drug delivery and plAsmonic photothermal therapy.
Journal ArticleDOI
Label-Free Biosensing by Surface Plasmon Resonance of Nanoparticles on Glass: Optimization of Nanoparticle Size
Nidhi Nath,Ashutosh Chilkoti +1 more
TL;DR: It is demonstrated that the size of gold nanoparticles significantly affects the sensitivity of the biosensor.
References
More filters
Journal ArticleDOI
Preparation and Characterization of Au Colloid Monolayers
TL;DR: In this article, the design and initial characterization of two-dimensional arrays of colloidal Au particles are reported, which are prepared by self-assembly of 12 nm diameter colloidal particles onto immobilized polymers having pendant functional groups with high affinity for Au (i.e., CN, SH, and NH 2 ).
Journal ArticleDOI
Colloidal metal films as a substrate for surface-enhanced spectroscopy
TL;DR: In this paper, the effect of the dielectric constant of solvents on the optical frequencies, as well as the specific interaction of the solvent molecules with the metal on the plasmon resonances, was examined in detail.
Journal ArticleDOI
Surface-enhanced raman scattering from microlithographic silver particle surfaces
TL;DR: In this article, surface-enhanced Raman scattering is observed from uniformly sized and shaped silver particles produced by evaporation of silver onto a lithographically produced microstructure, which can be shifted by changes in particle shape or surrounding dielectric constant in agreement with particle plasmon theories of surface Raman enhancement.
Journal ArticleDOI
Photophysics and photochemistry near surfaces and small particles
Joel I. Gersten,Abraham Nitzan +1 more
TL;DR: In this paper, the authors consider the role of cavity sites in surface-enhanced optical processes in terms of the incident beam direction, polarization and frequency, geometry and optical properties of the substrate and its environment and of the optical properties, location and orientation (relative to the substrate) of the adsorbed molecule.