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Journal ArticleDOI

Gold nanoparticles embedded zinc oxide films as possible optical filters

01 Aug 2011-International Journal of Nanoscience (World Scientific Publishing Company)-Vol. 10, pp 601-604

Abstract: Multilayered structures of gold nanoparticles (AuNPs) embedded Zno films were prepared by sandwiching Au nanoparticles in between magnetron sputtered Zno films. More than 80% transmittance in visible region was observed for Zno film. For structures consisting of single and double layers of AuNPs, transmittance at ~600 nm was reduced to ~25% and ~6%, respectively. AuNPs embedded sandwiches showed a huge reduction in UV Photoluminescence that was prominent in pure Zno films, and was attributed to the interband absorption in Au.
Topics: Nanoparticle (51%), Colloidal gold (50%), Transmittance (50%)
References
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Book
05 Oct 2014-
Abstract: 1. Introduction.- 2. Theoretical Considerations.- 3. Experimental Methods.- 4. Experimental Results and Discussion.- A.1 Tables: Optical Spectroscopy Experiments with Metal Clusters.- A.2 Survey of Optical Spectra of Elemental Metal Clusters and Chain-Aggregates.- A.3 Mie Computer Program.- References.

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Abstract: A simple method is proposed to control the size of alkanethiol-protected Au nanoparticles by heat treatment in the solid state. The mean diameter of the Au nanoparticles prepared by Brust's two-phase method (∼1.5 nm) was evolved to 3.4−9.7 nm by heating to 150−250 °C in air. The uniform growth of nanoparticles was not observed when tetraoctylammonium bromide (TOAB), which was used as a phase-transfer agent during the preparation of Au nanoparticles, was removed before the particle growth process. The crystal structures of Au nanoparticles and alkanethiol ligand structures on Au nanoparticles were characterized before and after the heat treatment. The size-evolution mechanism was discussed on the basis of the thermodynamic model. The heat-treated Au nanoparticles easily formed self-assembled 2D superlattices with hexagonal packing, where the alkanethiol protective agents with an all-trans conformation were estimated to interpenetrate each other.

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Journal ArticleDOI
TL;DR: Spectral overlap of the interband transitions of Cu with the nanoshell plasmon resonance results in a striking double-peaked plasMon resonance, a unique phenomenon previously unobserved in other noble or coinage metal nanostructures.
Abstract: The optical properties of metals arise both from optical excitation of interband transitions and their collective electronic, or plasmon, response. Here, we examine the optical properties of Cu, whose strong interband transitions dominate its optical response in the visible region of the spectrum, in a nanoshell geometry. This nanostructure permits the geometrical tuning of the nanoparticle plasmon energy relative to the onset of interband transitions in the metal. Spectral overlap of the interband transitions of Cu with the nanoshell plasmon resonance results in a striking double-peaked plasmon resonance, a unique phenomenon previously unobserved in other noble or coinage metal nanostructures.

174 citations