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Distance Controlled and Electrically Driven Photoluminescence Quench From Quantum Dot-Au Complexes

Published online by Cambridge University Press:  01 February 2011

Zhitao Kang ,
Jie Xu ,
Dinal Andreasen  and
Brent Karl Wagner
Zhitao Kang
Affiliation:
[email protected], Georgia Institute of Technology, Gerogia Tech Research Institute, Atlanta, Georgia, United States
Jie Xu
Affiliation:
[email protected], Georgia Institute of Technology, Gerogia Tech Research Institute, Atlanta, Georgia, United States
Dinal Andreasen
Affiliation:
[email protected], Georgia Institute of Technology, Gerogia Tech Research Institute, Atlanta, Georgia, United States
Brent Karl Wagner
Affiliation:
[email protected], Georgia Institute of Technology, Gerogia Tech Research Institute, Atlanta, Georgia, United States
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Abstract

Quantum Dots (QDs) bound to gold nanoparticles have shown photoluminescence (PL) quenching dependent on distance between the two particles. The incident light from the QD couples to plasmon excitation of the metal when the frequencies of the light and the surface plasmon resonance (SPR) coincide, leading to a reduction in emitted PL in the system. The quenching effect of gold nanoparticles on QDs was used to study protein-protein interactions with the potential for drug screening applications. CdTe and CdHgTe QDs with emission wavelengths from 500˜900nm were synthesized and gold nanospheres and nanorods with controlled absorption in the visible and near-infrared (NIR) wavelength regions were prepared. The PL quenching of QD-Protein-Protein-Au complexes was studied as a function of Au concentration, QD size and protein type. A quenching efficiency of up to 90% was observed. The QD-Au complexes were also studied for electric potential sensing. The surface of the QDs was negatively charged due to thiol ligands capping. By applying a positive potential on the gold or gold nanoparticle attached substrate, the local electric field between the substrate and the statically charged QDs would pull the QDs closer to the gold surface and quench the QD PL. PL quenching of QD with Au was studied as a function of electric signal and QD type. In this methodology, electric signals were effectively converted to optical signals.

Keywords

optical propertiesnanostructuresensor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1257: Symposium O – Multifunctional Nanoparticle Systems-Coupled Behavior and Applications , 2010 , 1257-O06-10
Copyright
Copyright © Materials Research Society 2010

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References

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