A Study of the Binding of Cyanine Dyes to Colloidal Quantum Dots Using Spectral Signatures of Dye Aggregation

Autor:	Eric A. McArthur, Emily A. Weiss, Daniel B. Tice, Jacqueline M. Godbe
Rok vydání:	2012
Předmět:	Intermolecular force Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Absorbance chemistry.chemical_compound Colloid General Energy Monomer Adsorption chemistry Quantum dot Molecule Physical and Theoretical Chemistry Cyanine
Zdroj:	The Journal of Physical Chemistry C. 116:6136-6142
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp300478g
Popis:	This paper describes the use of the spectral signatures of near-infrared (NIR) absorbing cyanine dyes to quantitatively analyze their intermolecular interactions upon adsorption to colloidal CdSe quantum dots (QDs) with diameters of 2–3 nm. Spectroscopic characterization of the disaggregation of two types of sulfonate-functionalized cyanine molecules, IR783 and IR820, from H-aggregate dimers to monomers upon addition of methanol yields spectral signatures of aggregation used to analyze the response of the dyes to exposure to CdSe QDs. The spectrally distinct absorbances of the cyanines and QDs enable a factor analysis procedure that decomposes the absorbance spectrum of the QD/cyanine mixture into three distinct components—solution-phase cyanine molecules (in monomer and H-aggregate form), QD-bound cyanine monomers, and disordered, QD-bound cyanine aggregates—as a function of the molar ratio of cyanine to QD. The presence of these three distinct components strongly suggests that cyanines initially bind to...
Databáze:	OpenAIRE
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