Thermal and photo stability of glutathione-capped cadmium telluride quantum dots
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Fecha
2015
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Wichtig Publishing Srl
Nombre de Curso
Licencia CC
Atribución-NoComercial 4.0 Internacional (CC BY-NC 4.0)
Licencia CC
https://creativecommons.org/licenses/by-nc/4.0/deed.es
Resumen
Background: Nanoparticles (NPs) are increasingly being used in a number of applications that include biomedicine, biological labeling and cancer marker targeting, and their successful storage is important to preserve their viability. A systematic investigation of the thermal and photo stability of chemically stabilized cadmium telluride (CdTe) quantum dots (QDs) under various storage conditions either in solution or as dried nanoparticles has not been published. Here we report experiments involving chemically synthesized glutathione-capped CdTe QDs whose photoluminescence spectra were examined initially and then periodically during storage times up to 76 days. Methods: Samples of dried QDs or QDs in solution (water or buffered) were examined under different light conditions including complete darkness, constant 12,000 lux incident light, and under diurnal sunlight; at temperatures ranging from -80°C to room temperature. Results: Though QDs stored in solution in the dark at -80°C lost only 50% of peak fluorescence (FL510) within 2 weeks, solution-stored QDs exposed to sunlight at room temperature showed FL510 drops of 85% in the first 24 hours. In contrast, QDs precipitated from aqueous solution, dried and stored in time course experiments in the presence of atmospheric oxygen – when resuspended in water – lost an average of only 12% FL510 over 76 days under all conditions tested, even in direct sunlight. Conclusions: Glutathione-capped CdTe particles can be stored as dried nanoparticles for extended periods of time, enhancing their viability in biomedicine, biological labeling and cancer marker targeting. © 2015 Wichtig Publishing.
Notas
Indexación: Scopus
Palabras clave
Nanoparticle storage, Photooxidation, Thiol-capped
Citación
Journal of Applied Biomaterials and Functional Materials Volume 13, Issue 3, Pages e248 - e2522015
DOI
10.5301/jabfm.5000221