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Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.
Nanyang Technology University, Singapore .
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.
Nanyang Technology University, Singapore .
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2013 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 117, no 44, 23148-23154 p.Article in journal (Refereed) Published
Abstract [en]

Bulk and surface refractive index sensitivity for localized surface plasmon resonance (LSPR) sensing based on edge gold-coated silver nanoprisms (GSNPs) and gold nanospheres was investigated and compared with conventional surface plasmon resonance (SPR) sensing based on propagating surface plasmons. The hybrid GSNPs benefit from an improved stability since the gold frame protecting the unstable silver facets located at the silver nanoprisms (SNPs) edges and tips prevents truncation or rounding of their sharp tips or edges, maintaining a high refractive index sensitivity even under harsh conditions. By using layer-by-layer deposition of polyelectrolytes and protein adsorption, we found that GSNPs exhibit 4-fold higher local refractive index sensitivity in close proximity (andlt;10 nm) to the surface compared to a flat gold film in the conventional SPR setup. Moreover, the sensitivity was 8-fold higher with GSNPs than with gold nanospheres. This shows that relatively simple plasmonic nanostructures for LSPR-based sensing can be engineered to outperform conventional SPR, which is particularly interesting in the context of detecting low molecular weight compounds where a small sensing volume, reducing bulk signals, is desired.

Place, publisher, year, edition, pages
American Chemical Society , 2013. Vol. 117, no 44, 23148-23154 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-102498DOI: 10.1021/jp408187eISI: 000326845400076OAI: oai:DiVA.org:liu-102498DiVA: diva2:678596
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF)||Knut and Alice Wallenberg Foundation (KAW)||Centre in Nano science and technology (CeNano)||Singapore MOE|RG 44/11M0E2012-T2-2-041ARC 5/13|CRP program from NRF Singapore|NRF-CRP5-2009-04|Science & Engineering Research Council (SERC) of Agency for Science Technology and Research (A*STAR)|102 152 0015|Swedish Research Council (VR)||

Available from: 2013-12-12 Created: 2013-12-12 Last updated: 2017-12-06
In thesis
1. Nanoplasmonic Sensing using Metal Nanoparticles
Open this publication in new window or tab >>Nanoplasmonic Sensing using Metal Nanoparticles
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In our modern society, we are surrounded by numerous sensors, constantly feeding us information about our physical environment. From small, wearable sensors that monitor our physiological status to large satellites orbiting around the earth, detecting global changes. Although, the performance of these sensors have been significantly improved during the last decades there is still a demand for faster and more reliable sensing systems with improved sensitivity and selectivity. The rapid progress in nanofabrication techniques has made a profound impact for the development of small, novel sensors that enables miniaturization and integration. A specific area where nanostructures are especially attractive is biochemical sensing, where the exceptional properties of nanomaterials can be utilized in order to detect and analyze biomolecular interactions. 

The focus of this thesis is to investigate plasmonic nanoparticles composed of gold or silver and optimize their performance as signal transducers in optical biosensors. Metal nanoparticles exhibit unique optical properties due to excitation of localized surface plasmons, which makes them highly sensitive probes for detecting small, local changes in their surrounding environment, for instance the binding of a biomolecule to the nanoparticle surface. This is the basic principle behind nanoplasmonic sensing based on refractometric detection, a sensing scheme that offers real-time and label-free detection of molecular interactions. 

This thesis shows that the sensitivity for detecting local refractive index changes is highly dependent on the geometry of the metal nanoparticles, their interaction with neighboring particles and their chemical composition and functionalization. An increased knowledge about how these parameters affects the sensitivity is essential when developing nanoplasmonic sensing devices with high performance based on metal nanoparticles. 

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 76 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1624
Keyword
Nanoparticles, sensing, biosensors, refractive index sensing, plasmonics, nanoplasmonics
National Category
Nano Technology
Identifiers
urn:nbn:se:liu:diva-111841 (URN)10.3384/diss.diva-111841 (DOI)978-91-7519-223-9 (ISBN)
Public defence
2014-11-28, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (English)
Opponent
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Available from: 2014-11-06 Created: 2014-11-05 Last updated: 2017-01-11Bibliographically approved

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Martinsson, ErikEnander, KarinAili, DanielLiedberg, Bo

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