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Optimizing the Refractive Index Sensitivity of Plasmonically Coupled Gold Nanoparticles
Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär fysik. Linköpings universitet, Tekniska högskolan.
ICN2 Institute Catala Nanociencia and Nanotecnol, Spain; CSIC Consejo Super Invest Cient, Spain.
Nanyang Technology University, Singapore.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
Vise andre og tillknytning
2014 (engelsk)Inngår i: PLASMONICS, ISSN 1557-1955, Vol. 9, nr 4, s. 773-780Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The possibility to enhance the local refractive index sensitivity using plasmonic coupling between spherical gold nanoparticles (Au-NPs) has been investigated. A strong and distinct optical coupling between Au-NPs of various sizes was achieved by controlling the interparticle separation using a layer-by-layer assembly of polyelectrolytes. The frequency of the coupled plasmon peak could be tuned by varying either the particle size or the interparticle separation, shown both experimentally and by theoretical simulations. The bulk refractive index (RI) sensitivity for the plasmonic coupling modes was investigated and compared to the RI sensitivity of monolayers of well-separated Au-NPs, and the results clearly demonstrates that the RI sensitivity can be significantly enhanced in plasmonically coupled Au-NPs. The proposed approach is simple and scalable and improves the rather modest RI sensitivity of spherical gold nanoparticles with a factor of 3, providing a new route for fabrication of inexpensive sensors based on plasmonic nanostructures.

sted, utgiver, år, opplag, sider
Springer Verlag (Germany) , 2014. Vol. 9, nr 4, s. 773-780
Emneord [en]
Metal nanoparticles; Localized surface plasmon resonance ( LSPR); Plasmonic coupling; Polyelectrolytes; Layer-by-layer
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-111291DOI: 10.1007/s11468-013-9659-yISI: 000341423800007OAI: oai:DiVA.org:liu-111291DiVA, id: diva2:755334
Merknad

Funding Agencies|Link ping University; Swedish Research Council (VR); Swedish Foundation for Strategic Research (SSF); Knut and Alice Wallenberg Foundation (KAW); Center in Nano science and technology (CeNano); MINECO, Explora Project [MAT2011-12645-E]

Tilgjengelig fra: 2014-10-14 Laget: 2014-10-14 Sist oppdatert: 2014-11-06
Inngår i avhandling
1. Nanoplasmonic Sensing using Metal Nanoparticles
Åpne denne publikasjonen i ny fane eller vindu >>Nanoplasmonic Sensing using Metal Nanoparticles
2014 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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. 

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2014. s. 76
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1624
Emneord
Nanoparticles, sensing, biosensors, refractive index sensing, plasmonics, nanoplasmonics
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-111841 (URN)10.3384/diss.diva-111841 (DOI)978-91-7519-223-9 (ISBN)
Disputas
2014-11-28, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2014-11-06 Laget: 2014-11-05 Sist oppdatert: 2019-11-19bibliografisk kontrollert

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