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Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, The Institute of Technology.
Institut Catala de Nanociencia i Nanotecnologia (ICN2), Consejo Superior de Investigaciones Cientificas (CSIC) & CIBER-BBN, Campus UAB, Bellaterra, Barcelona, Spain.
Northwestern University, Evanston, Illinois, USA.
Institut Catala de Nanociencia i Nanotecnologia (ICN2), Consejo Superior de Investigaciones Cientificas (CSIC) & CIBER-BBN, Campus UAB, Bellaterra, Barcelona, Spain.
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 42, 24680-24687 p.Article in journal (Refereed) Published
Abstract [en]

The bulk refractive index (RI) sensitivity of dispersed and immobilized silver nanoparticles of three different shapes (spheres, cubes, and plates) is investigated. We demonstrate, both experimentally and theoretically, that the influence of immobilization on the RI sensitivity is highly dependent on the shape of the nanoparticles. A strong correlation is seen between the fraction of the particle surface area in direct contact with the substrate and the decrease in RI sensitivity when the particles are immobilized on a glass substrate. The largest decrease (−36%) is seen for the most sensitive nanoparticles (plates), drastically reducing their advantage over other nanoparticle shapes. The shape-dependent substrate effect is thus an important factor to consider when designing nanoplasmonic sensors based on colloidal noble-metal nanoparticles.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 118, no 42, 24680-24687 p.
National Category
Nano Technology
URN: urn:nbn:se:liu:diva-111838DOI: 10.1021/jp5084086ISI: 000343740300051OAI: diva2:760911
Swedish Foundation for Strategic Research Swedish Research Council
Available from: 2014-11-05 Created: 2014-11-05 Last updated: 2014-11-28
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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