Photo-induced interaction of thioglycolic acid (TGA)-capped CdTe quantum dots with cyanine dyes.
The photo-induced interaction of three different sizes of thioglycolic acid (TGA)-capped CdTe quantum dots (CdTe QDs) with two monomethine cyanine dyes belonging to the thiazole orange (TO) family has been studied. Positively charged cyanines interact with QDs surface which is negatively charged due to capping agent carboxylate ions. The energy transfer parameters including Stern-Volmer constant, Ksv, number of binding sites, n, quenching sphere radius, r, the critical energy transfer distance, R0, and energy transfer efficiencies, E have been calculated. The effect of structure and the number of aggregating molecules have been studied as a function of CdTe QDs particle size. Combining organic and inorganic semiconductors leads to increase of the effective absorption cross section of the QDs which can be utilized in novel nanoscale designs for light-emitting, photovoltaic and sensor applications. A synthesized triplet emission of the studied dyes was observed using CdTe QDs as donors and this is expected to play a potential role in molecular oxygen sensitization and in photodynamic therapy (PDT) applications.
Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.
Mostafa F
MF
Abdelbar
Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.
Tarek A
TA
Fayed
Physics Department, Faculty of Science, Tanta University, Tanta, Egypt.
Talaat M
TM
Meaz
Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt; Misr University for Science and Technology (MUST), 6th of October City, Egypt.
El-Zeiny M
EM
Ebeid
D019187:Cadmium Compounds / Q000737:chemistry*; D002232:Carbocyanines / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004735:Energy Transfer; D010316:Particle Size; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D013050:Spectrometry, Fluorescence; D013691:Tellurium / Q000737:chemistry*; D013816:Thermodynamics; D013864:Thioglycolates / Q000737:chemistry*
D019187:Cadmium Compounds; D002232:Carbocyanines; D004396:Coloring Agents; D013864:Thioglycolates; C017487:2-mercaptoacetate; D013691:Tellurium; C028337:cadmium telluride