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One-pot synthesis of highly luminescent CdTe/CdS core/shell nanocrystals in aqueous phase

机译:在水相中一锅法合成高发光CdTe / CdS核/壳纳米晶体

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摘要

Surface passivation of nanocrystals with suitable organic or inorganic materials is key to improving the photoluminescence (PL) efficiency and stability of nanocrystals. Although the hot-injection organometallic approach is a powerful tool to achieve different kinds of core/shell structures, direct synthesis of such structures in aqueous phase, which bears many advantages such as biocompatibility, water-solubility, environment-friendliness, and cheapness, is less often reported. Herein we present a facile approach for the one-pot preparation of a water-soluble core/shell structure with CdTe cores packed in a CdS shell in aqueous phase. In comparison with plain CdTe nanocrystals, the PL efficiency of the obtained CdTe/ CdS core/shell structure can approach about 75%. The stability of the core/shell structure to UV irradiation and oxidation is also improved.
机译:用合适的有机或无机材料对纳米晶体进行表面钝化是提高纳米晶体的光致发光(PL)效率和稳定性的关键。尽管热注射有机金属方法是获得不同种类核/壳结构的有力工具,但在水相中直接合成此类结构具有许多优点,例如生物相容性,水溶性,环境友好性和便宜性,但仍是一种有效的方法。较少报道。本文中,我们提出一种简便的方法,用于一锅制备水溶性核/壳结构,其中CdTe核填充在水相中的CdS壳中。与普通的CdTe纳米晶体相比,获得的CdTe / CdS核/壳结构的PL效率可达到约75%。核/壳结构对UV辐射和氧化的稳定性也得到改善。

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