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Single Nanoparticle Plasmonic Sensors

by Manish Sriram 1,2,3,†, Kelly Zong 1,2,3,†, S. R. C. Vivekchand 1,2,3,* and J. Justin Gooding 1,2,3,*
1
School of Chemistry, The University of New South Wales, Sydney 2052, Australia
2
Australian Centre for NanoMedicine, The University of New South Wales, Sydney 2052, Australia
3
ARC Centre of Excellence in Bio-Nano Science & Technology, The University of New South Wales, Sydney 2052, Australia
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: W. Rudolf Seitz
Sensors 2015, 15(10), 25774-25792; https://doi.org/10.3390/s151025774
Received: 10 September 2015 / Revised: 30 September 2015 / Accepted: 8 October 2015 / Published: 12 October 2015
(This article belongs to the Section Chemical Sensors)
The adoption of plasmonic nanomaterials in optical sensors, coupled with the advances in detection techniques, has opened the way for biosensing with single plasmonic particles. Single nanoparticle sensors offer the potential to analyse biochemical interactions at a single-molecule level, thereby allowing us to capture even more information than ensemble measurements. We introduce the concepts behind single nanoparticle sensing and how the localised surface plasmon resonances of these nanoparticles are dependent upon their materials, shape and size. Then we outline the different synthetic approaches, like citrate reduction, seed-mediated and seedless growth, that enable the synthesis of gold and silver nanospheres, nanorods, nanostars, nanoprisms and other nanostructures with tunable sizes. Further, we go into the aspects related to purification and functionalisation of nanoparticles, prior to the fabrication of sensing surfaces. Finally, the recent developments in single nanoparticle detection, spectroscopy and sensing applications are discussed. View Full-Text
Keywords: surface plasmons; sensors; metal nanoparticles; single molecule detection; optical sensors surface plasmons; sensors; metal nanoparticles; single molecule detection; optical sensors
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Sriram, M.; Zong, K.; Vivekchand, S.R.C.; Gooding, J.J. Single Nanoparticle Plasmonic Sensors. Sensors 2015, 15, 25774-25792.

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