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Proceedings Paper

Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system
Author(s): Aliaksandra Rakovich; Alyona Sukhanova; Nicolas Bouchonville; Michael Molinari; Michel Troyon; Jacques H. M. Cohen; Yury Rakovich; John F. Donegan; Igor Nabiev
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Paper Abstract

The potential impact of nanoscience on energy transfer processes in biomolecules was investigated on the example of a complex between fluorescent semiconductor nanocrystals and photochromic membrane protein. The interactions between colloidal CdTe quantum dots (QDs) and bacteriorhodopsin (bR) protein were studied by a variety of spectroscopic techniques, including integrated and time-resolved fluorescence spectroscopies, zeta potential and size measurement, and fluorescence correlation spectroscopy. QDs' luminescence was found to be strongly modulated by bacteriorhodopsin, but in a controllable way. Decreasing emission lifetimes and blue shifts in QDs' emission at increasing protein concentrations suggest that quenching occurs via Förster resonance energy transfer. On the other hand, concave Stern-Volmer plots and sigmoidal photoluminescence quenching curves imply that the self-assembling of NCs and bR exists, and the number of nanocrystals (NCs) per bacteriorhodopsin contributing to energy transfer can be determined from the inflection points of sigmoidal curves. This number was found to be highly dependent not only on the spectral overlap between NC emission and bR absorption bands, but also on nanocrystal surface charge. These results demonstrate the potential of how inorganic nanoscale materials can be employed to improve the generic molecular functions of biomolecules. The observed interactions between CdTe nanocrystals and bacteriorhodopsin can provide the basis for the development of novel functional materials with unique photonic properties and applications in areas such as all-optical switching, photovoltaics and data storage.

Paper Details

Date Published: 20 May 2009
PDF: 8 pages
Proc. SPIE 7366, Photonic Materials, Devices, and Applications III, 736620 (20 May 2009); doi: 10.1117/12.821731
Show Author Affiliations
Aliaksandra Rakovich, Trinity College, Univ. of Dublin (Ireland)
Alyona Sukhanova, Univ. de Reims Champagne-Ardenne (France)
Nicolas Bouchonville, Univ. de Reims Champagne-Ardenne (France)
Michael Molinari, Univ. de Reims Champagne-Ardenne (France)
Michel Troyon, Univ. de Reims Champagne-Ardenne (France)
Jacques H. M. Cohen, Univ. de Reims Champagne-Ardenne (France)
Yury Rakovich, Trinity College, Univ. of Dublin (Ireland)
John F. Donegan, Univ. de Reims Champagne-Ardenne (France)
Igor Nabiev, Univ. de Reims Champagne-Ardenne (France)
CIC nanoGUNE Consolider (Spain)


Published in SPIE Proceedings Vol. 7366:
Photonic Materials, Devices, and Applications III
Ali Serpenguzel; Gonçal Badenes; Giancarlo C. Righini, Editor(s)

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