Discrete Dipole Approximation Analysis of Plasmonic Core/Alloy Nanoparticles

The surface plasmon resonance (SPR) properties of Au/AuxAg1−x core/alloy nanoparticles (NPs) have been investigated by means of the discrete dipole approximation. The core/alloy microstructure was varied by changing the shell alloy composition x, its thickness tS, and the shell thickness to core rad...

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Published in:Chemphyschem 2014-08, Vol.15 (12), p.2582-2587
Main Authors: Wu, Wenjie, Maye, Mathew M.
Format: Article
Language:English
Subjects:
Alloys
Chemistry
Colloidal state and disperse state
core/alloy structures
discrete dipole approximation
Exact sciences and technology
General and physical chemistry
nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
structure elucidation
surface plasmon resonance
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Maye, Mathew M.
description The surface plasmon resonance (SPR) properties of Au/AuxAg1−x core/alloy nanoparticles (NPs) have been investigated by means of the discrete dipole approximation. The core/alloy microstructure was varied by changing the shell alloy composition x, its thickness tS, and the shell thickness to core radius ratio (tS/rC) in the range of 0.05–1.0. These changes resulted in a novel tuning of SPR shape, frequency, and extinction. These models were compared with experimental results for Au/AuxAg1−x NPs prepared by a microwave‐mediated hydrothermal processing method, which produces core/alloy NPs with SPR signatures closely resembling those of the models. To the core: The surface plasmon resonance (SPR) of Au/AuxAg1−x core/alloy nanoparticles (NPs) has been studied by discrete dipole approximation (DDA; see figure). The SPRs were tunable by both alloy shell composition x and thickness tS. Through simulations of a series of core/alloy model NPs with x=0.2–0.8 and shell thickness to core radius ratio 0.05–1.0, the SPR features were compared with experimental measurements.
doi_str_mv 10.1002/cphc.201402082
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Electrokinetic phenomena</topic><topic>structure elucidation</topic><topic>surface plasmon resonance</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wu, Wenjie</creatorcontrib><creatorcontrib>Maye, Mathew M.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>MEDLINE - Academic</collection><jtitle>Chemphyschem</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wu, Wenjie</au><au>Maye, Mathew M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Discrete Dipole Approximation Analysis of Plasmonic Core/Alloy Nanoparticles</atitle><jtitle>Chemphyschem</jtitle><addtitle>ChemPhysChem</addtitle><date>2014-08-25</date><risdate>2014</risdate><volume>15</volume><issue>12</issue><spage>2582</spage><epage>2587</epage><pages>2582-2587</pages><issn>1439-4235</issn><eissn>1439-7641</eissn><abstract>The surface plasmon resonance (SPR) properties of Au/AuxAg1−x core/alloy nanoparticles (NPs) have been investigated by means of the discrete dipole approximation. 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Through simulations of a series of core/alloy model NPs with x=0.2–0.8 and shell thickness to core radius ratio 0.05–1.0, the SPR features were compared with experimental measurements.</abstract><cop>Weinheim</cop><pub>WILEY-VCH Verlag</pub><pmid>24889191</pmid><doi>10.1002/cphc.201402082</doi><tpages>6</tpages></addata></record>
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subjects Alloys
Chemistry
Colloidal state and disperse state
core/alloy structures
discrete dipole approximation
Exact sciences and technology
General and physical chemistry
nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
structure elucidation
surface plasmon resonance
title Discrete Dipole Approximation Analysis of Plasmonic Core/Alloy Nanoparticles
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