Luminescence of hybrid nanostructures based on colloidal Ag2S/TGA quantum dots and Indocyanine Green molecules

This work presents studies of IR luminescence sensitization of Indocyanine Green dye (ICG), observed during association with colloidal Ag 2 S quantum dots with an average size of 2.2 nm passivated with thioglycolic acid (Ag 2 S/TGA QD). The opportunity of enhancing the dye monomer luminescence (peak...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2020-09, Vol.22 (9), Article 271
Main Authors: Kondratenko, Tamara S., Smirnov, Mikhail S., Ovchinnikov, Oleg V., Grevtseva, Irina G.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Conjugation
Dyes
Inorganic Chemistry
Lasers
Luminescence
Materials Science
Nanoparticles
Nanotechnology
Optical Devices
Optical properties
Optics
Photonics
Physical Chemistry
Quantum dots
Research Paper
Thioglycolic acid
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Summary:This work presents studies of IR luminescence sensitization of Indocyanine Green dye (ICG), observed during association with colloidal Ag 2 S quantum dots with an average size of 2.2 nm passivated with thioglycolic acid (Ag 2 S/TGA QD). The opportunity of enhancing the dye monomer luminescence (peak at 820 nm) by 4–6 times under excitation of 660 nm in the presence of Ag 2 S/TGA QDs (2.2 nm) was shown. At the same time, Ag 2 S/TGA QDs luminescence intensity does not change. quantum yield (QY) luminescence of ICG increases by 5 times. The luminescence lifetime obtained with use of luminescence decay analysis at wavelength of 820 nm increases by 2.2 times. The observed changes in ICG luminescent properties during its conjugation with Ag 2 S/TGA QDs are result of a decrease in the mobility of the dye polymethine chain due to coordination interaction with Ag 2 S/TGA QDs, which decreases the efficiency of non-radiative transitions.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-020-04981-w