Fluorescence behavior of glutathione capped CdTe@ZnS quantum dots chemically coordinated to zinc octacarboxy phthalocyanines

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• 作者：Kutloano E. Sekhosana ; Edith Antunes ; Samson Khene ; Sarah D&rsquo ; Souza ; Tebello Nyokong ; ^{t.nyokong@ru.ac.za}
• 关键词：Glutathione ; Zinc octaphthalocyanine ; Quantum dots ; Fluorescence energy transfer
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：136
• 期：Complete
• 页码：255-264
• 全文大小：2053 K

文摘

Core-shell CdTe@ZnS quantum dots capped with glutathione (CdTe@ZnS-GSH) were covalently linked to zinc octacarboxy phthalocyanine (ZnPc(COOH)₈). The conjugate was characterized by UV/Vis, infrared and X-Ray photoelectron spectroscopies as well as transmission electron and atomic force microscopies. The fluorescence quantum yields of the core CdTe capped with thioglycolic acid increased upon formation of the core-shell. Upon conjugation with ZnPc(COOH)₈, the fluorescence quantum yield of CdTe@ZnS-GSH decreased due to energy transfer from the latter to the Pc. The average fluorescence lifetime of the CdTe@ZnS-GSH QD also decreased upon conjugation from 26.2 to 13.3 ns.