Spectroscopic studies on the interaction between thioglycolic acid (TGA)- capped CdTe quantum dots and cyanine dyes | ||||
| Delta Journal of Science | ||||
| Article 12, Volume 38, Issue 1, June 2017, Page 115-137 PDF (2.39 MB) | ||||
| Document Type: Research and Reference | ||||
| DOI: 10.21608/djs.2017.139436 | ||||
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| Authors | ||||
| Mostafa F. Abdelbar1; Tarek A. Fayed1; Talaat M. Meaz2; El- Zeiny M. Ebeid* 3 | ||||
| 1Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt | ||||
| 2Physics Department, Faculty of Science, Tanta University, Tanta, Egypt | ||||
| 3Misr University for Science and Technology (MUST), 6th of October City, Egypt | ||||
| Abstract | ||||
| Three different particle sizes from cadmium telluride semiconductor quantum dots (CdTe QDs) have been prepared using thioglycolic acid as a capping agent in aqueous media. The photophysical behavior for these particles has been studied in presence of monomethine dyes belong to thiazole orange (TO) family. The aggregation of the cyanine dyes on QDs surface was attributed to the presence of electrostatic attraction between negatively charged thioglycolic capping molecules and the ionic dye. Energy transfer process from CdTe QDs to cyanine dyes was also studied using electronic absorption and steady state emission measurements. The energy transfer parameters such as Stern- Volmer rate constants Ksv, binding sites n, quenching sphere radius "r", critical energy transfer distance "R0" and the efficiency of energy transfer E, have been calculated. The enhancement in the triplet state emission and absorption for the studied dye in the presence of QDs was expected to play a role in molecular oxygen sensitization and photodynamic therapy (PDT) as well as photovoltaic applications. | ||||
| Keywords | ||||
| CdTe; Quantum dots; Thiazole; Quenching | ||||
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