ZnSe:Mn aqueous colloidal quantum dots for optical and biomedical applications

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• 作者：Thiago G. Silva ; Igor M. R. Moura ; Paulo E. Cabral Filho ; Maria I. A. Pereira ; Clayton A. Azevedo Filho ; Goreti Pereira ; Giovannia A. L. Pereira ; Adriana Fontes and Beate S. Santos
• 刊名：physica status solidi (c)
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：13
• 期：7-9
• 页码：530-533
• 全文大小：522K
• ISSN：1610-1642a

文摘

In this study, we present the optimization of the optical properties of Mn²⁺ doped ZnSe QDs (also referred to as d-dots) coated with thioglycolic acid in aqueous medium. The nanoparticles were characterized by ionic coupled plasma, electron paramagnetic resonance, transmission electron microscopy and X-ray diffractometry. By applying a controlled dose of UV irradiation, we obtained efficient orange emitting d-dots (⁴T₁→ ⁶A₁ transition centered at 580 nm). The results point out to a doping fraction in the nanoparticles smaller than 1% (0.89%), and that the Mn²⁺ ions are preferentially located close to the particle's surface. The UV photoactivation procedure has a definite influence on the emission intensity and on the colloidal stability of the particles. Photoactivated Mn²⁺ d-dots were conjugated to Concanavalin A and labeled specifically Candida albicans yeast cells, by targeting carbohydrate residues depicting the successful use of these QDs as fluorescent probes. (