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Key Role of Aspect Ratio in Optimising Local Surface Plasmon Sensitivities of Solution Phase Triangular Silver Nanoplates

Published online by Cambridge University Press:  31 January 2011

Denise E. Charles ,
Damian Aherne ,
Deirdre M. Ledwith ,
Yurii K Gun'ko ,
John M Kelly ,
Werner J Blau  and
Margaret E Brennan-Fournet
Denise E. Charles
Affiliation:
charled@tcd.ie, Trinity College Dublin, School of Physics, Dublin, Ireland
Damian Aherne
Affiliation:
damian.aherne@gmail.com, Trinity College Dublin, School of Chemistry, Dublin, Ireland
Deirdre M. Ledwith
Affiliation:
Deirdre.Ledwith@nuigalway.ie, National University of Ireland, Galway, School of Physics, Distillery Road, Galway, Galway, na, Ireland
Yurii K Gun'ko
Affiliation:
igounko@tcd.ie, Trinity College Dublin, School of Chemistry, Dublin, Ireland
John M Kelly
Affiliation:
jmkelly@tcd.ie, Trinity College Dublin, School of Chemistry, Dublin, Ireland
Werner J Blau
Affiliation:
wblau@tcd.ie, Trinity College Dublin, School of Physics, Dublin, Ireland
Margaret E Brennan-Fournet
Affiliation:
Margaret.BrennanFournet@nuigalway.ie, United States
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Abstract

Solution phase triangular silver nanoplate (TSNP) ensembles are herein presented as tunable, highly sensitive, LSPR sensors with excellent potential for versatile amply responsive biosensing applications. The recorded LSPR refractive index sensitivities for the highest aspect ratio TSNPs examined are amongst the highest reported to date for various other nanostructures. Calculations demonstrate that sensitivities of the TSNP sols, as high as the theoretical upper limit, are achievable by tuning the aspect ratio parameter, without any significant diminution observed due to ensemble averaging. Theoretical studies identify the aspect ratio of the nanoplates as a key parameter in controlling the LSPR sensitivity of the TSNPs.

Keywords

nanostructureAgsensor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1208: Symposium O – Excitons and Plasmon Resonances in Nanostructures II , 2009 , 1208-O18-23
Copyright
Copyright © Materials Research Society 2010

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