DISTANCE-DEPENDENCE OF PLASMON-MULTIEXCITON COUPLING BETWEEN CDSE QUANTUM DOTS AND GOLD NANOSTRUCTURES

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Castaneda, J. (2015). DISTANCE-DEPENDENCE OF PLASMON-MULTIEXCITON COUPLING BETWEEN CDSE QUANTUM DOTS AND GOLD NANOSTRUCTURES. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Quantum confinement that semiconductors experience at the nanoscale facilitate the creation of multiexcitons. However, this same confinement also increases the efficiency of Auger recombination which result in low quantum yields from these states. The emission rates of quantum dots are known to be modified by the surface plasmon resonances of gold nanostructures. This plasmon-exciton interaction is thought to be a near-field interaction between the quantum dot excited state and the plasmon resonance of the metal, thus, indicating an interaction that is distance-dependant. A similar interaction is expected between the quantum dot multiexciton state and the plasmon resonance of the metal.In this work, the distance-dependence of the plasmon-multiexciton interaction was probed by use of modified substrates that controlled separation between gold nanoparticles and quantum dots through the use of bifunctional molecules, layer-by-layer deposition, and single molecule fluorescence techniques.

Details
Author

Castaneda, Jose

Title

DISTANCE-DEPENDENCE OF PLASMON-MULTIEXCITON COUPLING BETWEEN CDSE QUANTUM DOTS AND GOLD NANOSTRUCTURES

Physical Description

1 online resource (80 pages) : PDF

Date

2015

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Quantum confinement that semiconductors experience at the nanoscale facilitate the creation of multiexcitons. However, this same confinement also increases the efficiency of Auger recombination which result in low quantum yields from these states. The emission rates of quantum dots are known to be modified by the surface plasmon resonances of gold nanostructures. This plasmon-exciton interaction is thought to be a near-field interaction between the quantum dot excited state and the plasmon resonance of the metal, thus, indicating an interaction that is distance-dependant. A similar interaction is expected between the quantum dot multiexciton state and the plasmon resonance of the metal.In this work, the distance-dependence of the plasmon-multiexciton interaction was probed by use of modified substrates that controlled separation between gold nanoparticles and quantum dots through the use of bifunctional molecules, layer-by-layer deposition, and single molecule fluorescence techniques.

Genre

masters theses

Subjects--Topics

Chemistry
Chemistry, Physical and theoretical

Degree

M.S.

Keywords

Gold
Layer-By-Layer
Nanoparticle
Photon Correlation
Polyelectrolyte
Quantum Dot

Subject Area

Chemistry

Advisor(s)

Jones, Marcus

Committee Members

Her, Tsing-Hua
Vivero-Escoto, Juan
Walter, Michael

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2015.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Castaneda_uncc_0694N_10831

Permalink

http://hdl.handle.net/20.500.13093/etd:667