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Influence of Surfactant Bilayers on the Refractive Index Sensitivity and Catalytic Properties of Anisotropic Gold Nanoparticles
Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär fysik. Linköpings universitet, Tekniska fakulteten. Northwestern University, IL 60208 USA.
Nanyang Technology University, Singapore.
Northwestern University, IL 60208 USA.
Northwestern University, IL 60208 USA.
Vise andre og tillknytning
2016 (engelsk)Inngår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 12, nr 3, s. 330-342Artikkel i tidsskrift (Fagfellevurdert) Published
Resurstyp
Text
Abstract [en]

Shape-controlled synthesis of gold nanoparticles generally involves the use of surfactants, typically cetyltrimethylammonium (CTAX, X = Cl-, Br-), to regulate the nucleation growth process and to obtain colloidally stable nanoparticles. The surfactants adsorb on the nanoparticle surface making further functionalization difficult and therefore limit their use in many applications. Herein, the influence of CTAX on nanoparticle sensitivity to local dielectric environment changes is reported. It is shown, both experimentally and theoretically, that the CTAX bilayer significantly reduces the refractive index (RI) sensitivity of anisotropic gold nanoparticles such as nanocubes and concave nanocubes, nanorods, and nanoprisms. The RI sensitivity can be increased by up to 40% by removing the surfactant layer from nanoparticles immobilized on a solid substrate using oxygen plasma treatment. This increase compensates for the otherwise problematic decrease in RI sensitivity caused by the substrate effect. Moreover, the removal of the surfactants both facilitates nanoparticle biofunctionalization and significantly improves their catalytic properties. The strategy presented herein is a simple yet effective universal method for enhancing the RI sensitivity of CTAX-stabilized gold nanoparticles and increasing their potential as transducers in nanoplasmonic sensors, as well as in catalytic and biomedical applications.

sted, utgiver, år, opplag, sider
WILEY-V C H VERLAG GMBH , 2016. Vol. 12, nr 3, s. 330-342
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-125149DOI: 10.1002/smll.201502449ISI: 000368707800006PubMedID: 26583756OAI: oai:DiVA.org:liu-125149DiVA, id: diva2:903423
Merknad

Funding Agencies|Swedish Research Council (VR); Stockholm Brain Institute (SBI); AFOSR [FA9550-12-1-0280]; NSFs MRSEC program at the Materials Research Center of Northwestern University [DMR-1121262]; Singapore Agency for Science, Technology and Research (A*STAR); Nanyang Technological University Postdoctoral Fellowship by Institute of Nano-System Interface Science & Technology (INSIST).

The previous status of this article was Manuscript.

Tilgjengelig fra: 2016-02-15 Laget: 2016-02-15 Sist oppdatert: 2017-11-30bibliografisk kontrollert
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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