Authors: Mopelola Idowu, Emmanuel Lamprecht, Tebello Nyokong

Journal of Photochemistry and Photobiology A: Chemistry, Volume 198, Issue 1, 5 July 2008, Pages 7-12

Abstract

Luminescent water-soluble CdTe quantum dots (QDs) capped with different thiol carboxylic acids were synthesized in aqueous medium and then cross linked to bovine serum albumin (BSA) with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC).

Enhancement of fluorescence emission intensity occurred for QDs in the presence of bovine serum albumin (BSA, mixed or linked) signifying inhibition of non-radiative recombination of the surface vacancies. Fluorescence studies reveal a positive deviation behaviour suggesting the occurrence of static and dynamic mechanisms of quenching together which was accounted for by the modified Stern–Volmer equation.