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Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms
Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär fysik. Linköpings universitet, Tekniska fakulteten.
Nanyang Technology University, Singapore .
Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär fysik. Linköpings universitet, Tekniska fakulteten.
Nanyang Technology University, Singapore .
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2013 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 117, nr 44, s. 23148-23154Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Chemical Society , 2013. Vol. 117, nr 44, s. 23148-23154
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-102498DOI: 10.1021/jp408187eISI: 000326845400076OAI: oai:DiVA.org:liu-102498DiVA, id: diva2:678596
Anmärkning

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)||

Tillgänglig från: 2013-12-12 Skapad: 2013-12-12 Senast uppdaterad: 2017-12-06
Ingår i avhandling
1. Nanoplasmonic Sensing using Metal Nanoparticles
Öppna denna publikation i ny flik eller fönster >>Nanoplasmonic Sensing using Metal Nanoparticles
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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. 

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2014. s. 76
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1624
Nyckelord
Nanoparticles, sensing, biosensors, refractive index sensing, plasmonics, nanoplasmonics
Nationell ämneskategori
Nanoteknik
Identifikatorer
urn:nbn:se:liu:diva-111841 (URN)10.3384/diss.diva-111841 (DOI)978-91-7519-223-9 (ISBN)
Disputation
2014-11-28, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2014-11-06 Skapad: 2014-11-05 Senast uppdaterad: 2019-11-19Bibliografiskt granskad

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Martinsson, ErikEnander, KarinAili, DanielLiedberg, Bo

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