Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system

Aliaksandra Rakovich; Alyona Sukhanova; Nicolas Bouchonville; Michael Molinari; Michel Troyon; Jacques H. M. Cohen; Yury Rakovich; John F. Donegan; Igor Nabiev

doi:10.1117/12.821731

20 May 2009 Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system

Aliaksandra Rakovich, Alyona Sukhanova, Nicolas Bouchonville, Michael Molinari, Michel Troyon, Jacques H. M. Cohen, Yury Rakovich, John F. Donegan, Igor Nabiev

Author Affiliations +

Proceedings Volume 7366, Photonic Materials, Devices, and Applications III; 736620 (2009) https://doi.org/10.1117/12.821731
Event: SPIE Europe Microtechnologies for the New Millennium, 2009, Dresden, Germany

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.

Citation Download Citation

Aliaksandra Rakovich, Alyona Sukhanova, Nicolas Bouchonville, Michael Molinari, Michel Troyon, Jacques H. M. Cohen, Yury Rakovich, John F. Donegan, and Igor Nabiev "Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system", Proc. SPIE 7366, Photonic Materials, Devices, and Applications III, 736620 (20 May 2009); https://doi.org/10.1117/12.821731

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available