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Optimizing the Refractive Index Sensitivity of Plasmonically Coupled Gold Nanoparticles
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, The Institute of Technology.
ICN2 Institute Catala Nanociencia and Nanotecnol, Spain; CSIC Consejo Super Invest Cient, Spain.
Nanyang Technology University, Singapore.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
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2014 (English)In: PLASMONICS, ISSN 1557-1955, Vol. 9, no 4, 773-780 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Springer Verlag (Germany) , 2014. Vol. 9, no 4, 773-780 p.
Keyword [en]
Metal nanoparticles; Localized surface plasmon resonance ( LSPR); Plasmonic coupling; Polyelectrolytes; Layer-by-layer
National Category
Physical Sciences Biological Sciences
URN: urn:nbn:se:liu:diva-111291DOI: 10.1007/s11468-013-9659-yISI: 000341423800007OAI: diva2:755334

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]

Available from: 2014-10-14 Created: 2014-10-14 Last updated: 2014-11-06
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.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1624
Nanoparticles, sensing, biosensors, refractive index sensing, plasmonics, nanoplasmonics
National Category
Nano Technology
urn:nbn:se:liu:diva-111841 (URN)10.3384/diss.diva-111841 (DOI)978-91-7519-223-9 (print) (ISBN)
Public defence
2014-11-28, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (English)
Available from: 2014-11-06 Created: 2014-11-05 Last updated: 2014-11-06Bibliographically approved

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