当前位置: X-MOL 学术Nano-Struct. Nano-Objects › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Synthesis of novel Zn-In-S/ZnS core/shell quantum dots: Temporal evolution and functionalization
Nano-Structures & Nano-Objects Pub Date : 2021-02-05 , DOI: 10.1016/j.nanoso.2021.100673
Nkosingiphile Zikalala , Sundararajan Parani , Oluwatobi S. Oluwafemi

Ternary quantum dots (QDs) have been developed as a safer alternative to conventional cadmium containing binary QDs due to their low toxicity. However, the reports on ternary QDs are majorly based on I–III–VI QDs such as CuInS and AgInS QDs. II–III–VI​ QDs such as ZnInS (ZIS) QDs have been given less attention due to their inherent lamellar structure that causes synthetic difficulties in obtaining the zero-dimensional (0D)structure. In this work, we, report an aqueous synthesis of thioglycolic acid and gelatin capped novel ZIS/ZnS core/shell QDs. The results revealed that the as-synthesized ZIS/ZnS QDs were well dispersed with an average particle size of 7.0 ± 2.0 nm and emitting in the green region. The synthetic condition for the ZnS shell was optimized by changing the concentration of the shell precursors which resulted in improved photoluminescence quantum yield (PLQY). Contrary to the blue-shifted emission usually experienced during the shell growth in I–III–VI ternary QDs, ZIS/ZnS displayed slight red shift compared to core ZIS QDs in the optical spectra. In addition, functionalization of the ZIS/ZnS QDs with amino acids (L-arginine and L-cysteine) enhanced the luminescence and offers new possibilities for its use in diverse applications.



中文翻译:

新型Zn-In-S / ZnS核/壳量子点的合成:时间演化和功能化

由于毒性低,三元量子点(QD)已被开发为常规含镉二元QD的安全替代品。但是,有关三元QD的报告主要基于I–III–VI QD,例如CuInS和AgInS QD。诸如ZnInS(ZIS)QD之类的II–III–VIQD由于其固有的层状结构而导致获得零维(0D)结构的合成困难,因而受到了较少的关注。在这项工作中,我们报告了巯基乙酸和明胶封端的新型ZIS / ZnS核/壳量子点的水合成。结果表明,合成后的ZIS / ZnS QD分散良好,平均粒径为7.0±2.0 nm,并在绿色区域发射。通过改变壳前体的浓度优化了ZnS壳的合成条件,从而提高了光致发光量子产率(PLQY)。与I–III–VI三元QD的壳生长过程中通常经历的蓝移发射相反,与核心ZIS QD在光谱中相比,ZIS / ZnS显示出轻微的红移。此外,用氨基酸(L-精氨酸和L-半胱氨酸)对ZIS / ZnS QD的功能化增强了发光,并为其在各种应用中的使用提供了新的可能性。

更新日期:2021-02-05
down
wechat
bug