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- W2270657169 abstract "Recently, semiconductor quantum dots (QDs) have aroused tremendous research interests in the fields of physics, chemistry, biology and engineering. Because of quantum confinement effect, QDs have shown some unique physical and chemical properties when their size is close to or smaller than the dimension of exciton within corresponding bulk materials [1–3]. Regarding the inherent toxicity of cadmium-based QDs such as CdSe, CdTe and CdS that may hinder the safe use in biological systems [4-6], it is of great significance to develop a kind of less toxic labeling material which does not contain any Class A element (Cd, Pb, and Hg). ZnSe QDs come into being in such a case. Generally, the bulk emission of ZnSe QDs is located in the UV-blue spectral region (less than 500 nm), metal impurities such as Cu, Mn are often added as dopant into the crystalline ZnSe QDs (d-dots) in order to modulate the emission of ZnSe QDs into the visible range. In 2001, Norris et al. developed an organometallic method for the synthesis of Mn-doped ZnSe (Mn:ZnSe) QDs and confirmed that the Mn impurities were embedded inside the nanocrystals [7]. In 2005, Peng et al. introduced the nucleation-doping strategy in the preparation of Mn:ZnSe QDs using high-temperature organometallic synthesis[8]. However, these procedures are environmentally unfriendly, and the as-prepared QDs cannot directly used for biological system. In recent year, direct synthesis of doped quantum dots (d-dots) in aqueous solution was more appealing though the procedure was much more difficult due to the employment of different solvents, precursors, reaction conditions and reaction mechanisms [9]. In 2009, Zhang et al. showed the first case of aqueous synthesis of internally doped Cu:ZnSe QDs[10]. Unfortunately, the as-prepared QDs presented poor chemical stability. Later, Xu et al. reported the improved method for the synthesis of Cu:ZnSe/ZnS QDs with excellent stability through two-step reactions in which the core/shell structure and the internaldoped impurities provided dual protection for the doped Cu impurities[11]. Dong et al. also investigated a two-step method to synthesize water-soluble ZnSe:Mn/ZnS core/shell d-dots[12]. To the best of our knowledge, no report has been published on the aqueous one-pot synthesis of Cu:ZnSe/ZnS core/shell QDs with selenium dioxide containing Cu as Se source." @default.
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- W2270657169 date "2015-06-01" @default.
- W2270657169 modified "2023-09-27" @default.
- W2270657169 title "Microwave-assisted One-pot Synthesis of Yellow Cu: ZnSe/ZnS Quantum Dots Using Selenium Dioxide Containing Copper Impurity" @default.
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