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首页> 外文期刊>Nanotechnology >Aqueous synthesis of Cu-doped ZnCdS/ZnS core/shell nanocrystals with a new and highly reactive sulfur source
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Aqueous synthesis of Cu-doped ZnCdS/ZnS core/shell nanocrystals with a new and highly reactive sulfur source

机译：新型高反应性硫源的水掺杂铜掺杂ZnCdS / ZnS核/壳纳米晶体

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摘要

A new sulfur precursor with a highly reactive chemical nature was prepared with S powder and NaBH4 at the high temperature of 180 oC in a closed autoclave and made it possible to carry out the synthesis of high quality metal sulfide nanocrystals (NCs) with diverse composition and structure. Using this new sulfur source, we demonstrated aqueous synthesis of colloidal Cu-doped ZnCdS NCs (d-dots) with pure, color-tunable photoluminescence (PL) in a wide spectral range (from 517 to 650 nm) based on the ‘co-nucleation doping’ strategy. The influences of the various experimental variables, including Cd=Zn ratio, Cudoping concentration, pH value and amount of mercaptopropionic acid (MPA), on the optical properties of Cu-doped ZnCdS NCs were systematically investigated. Furthermore, highly efficient and stable dopant emission from Cu:ZnCdS=ZnS core/shell d-dots with PL quantum yield as high as 40% was achieved by the deposition of a ZnS shell around the bare Cu:ZnCdS cores; this is the highest reported to date for aqueous doped NCs. The optical properties and structure of the d-dots were characterized by UV–vis absorption spectra, PL spectra, xray photoelectron spectroscopy, powder x-ray diffraction, and transmission electron microscopy. The experimental results indicated that this facile synthesis route would provide a versatile approach for the preparation of other watersoluble sulfide NCs.
机译：在密闭的高压釜中，在180 oC的高温下，用S粉和NaBH4制备了具有高反应活性化学性质的新型硫前驱体，从而可以合成具有不同组成和结构的高质量金属硫化物纳米晶体（NCs）。结构体。使用这种新的硫源，我们证明了在宽谱范围（从517至650 nm）的基础上，具有纯色可调光致发光（PL）的铜掺杂ZnCdS胶态NCs（d点）的水合成。成核掺杂”策略。系统研究了Cd = Zn比，Cudoping浓度，pH值和巯基丙酸（MPA）含量等各种实验变量对掺Cu ZnCdS NCs光学性能的影响。此外，通过在裸露的Cu：ZnCdS核周围沉积ZnS壳层，可以实现高效，稳定的Cu：ZnCdS = ZnS核/壳d点的PL量子产率高，稳定的发射。这是迄今为止水性掺杂NC的最高报道。 d点的光学性质和结构通过紫外可见吸收光谱，PL光谱，X射线光电子能谱，粉末X射线衍射和透射电子显微镜来表征。实验结果表明，该简便的合成路线将为制备其他水溶性硫化物NC提供一种通用的方法。

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