不同配体对CdHgTe/ZnTe的质量及稳定性的研究  

The quality and stability of CdHgTe/ZnTe with different ligands

作　　者：刘西京 郑汉 张家泉 LIU Xijing;ZHENG Han;ZHANG Jiaquan(School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi 435003,China;Department of Chemistry,University of Liverpool,Liverpool L697ZD,The United Kingdom)

机构地区：[1]湖北理工学院环境科学与工程学院,湖北黄石435003 [2]利物浦大学化学院,利物浦L697ZD

出　　处：《功能材料》2024年第8期8208-8213,共6页Journal of Functional Materials

基　　金：国家自然科学基金青年基金项目(42107088);湖北省教育厅青年基金项目(Q20214506);矿区环境污染控制与修复湖北省重点实验室开放基金项目(2023XZ104)。

摘　　要：研究了负载巯基丙酸(MPA)、半胱氨酸(L-Cys)和谷胱甘肽(GSH)3种配体的高亮度水溶性近红外CdHgTe/ZnTe纳米晶体。实验首次采用冻解熔融分段控温微波一步合成高质量的CdHgTe/ZnTe核壳纳米晶。纳米晶体的荧光产率极大程度的受到了合成时组分、浓度、以及表面配体的影响。对CdHgTe/ZnTe纳米晶体采用了紫外光谱、荧光光谱对其光谱性能进行分析,透射电镜、X射线衍射、光电子能谱对其表面形态和结构进行表征。结果显示纳米晶体的荧光产率能显著提高的最主要的原因是CdHgTe核与ZnTe壳层的晶格错配率仅为6%,极大的降低了其表面缺陷同时提高了纳米晶体的荧光稳定性。此外,CdHgTe/ZnTe核壳纳米晶体成功的运用于细胞的标记。在紫外光连续40 min的照射下,半胱氨酸和谷胱甘肽所负载的纳米晶体荧光基本没有变化,表明其较高的抗光漂白和抗氧化性能。In this paper,strong photoluminescence near-infrared(NIR)-emitting CdHgTe/ZnTe nanocrystals were synthesized using different thiol ligands 3-mercaptopropionic acid(MPA),L-Cysteine(L-Cys),and glutathione(GSH).This research utilizes a novel temperature-controlled microwave-assisted methodology via freezing-thawing(F-T)progress to synthesize superior CdHgTe/ZnTe core-shell nanocrystals.The study reveals that the photoluminescence quantum yields are markedly influenced by the synthesis parameters,including component types,concentration levels,and the choice of surface ligands.Different technologies including UV-vis,photoluminescence spectroscopy,transmission electron microscopy,powder X-ray diffraction and X-ray photoelectron spectroscopy were employed to characterize the as-prepared nanocrystals.The results showed that enhanced photoluminescence yield is primarily due to the low lattice mismatch(6%)between the CdHgTe core and the ZnTe shell materials,which significantly boosts the fluorescence stability and presents a low density of defects in the shell.Furthermore,the core-shell CdHgTe/ZnTe nanocrystals were successfully applied for fixed cells.The biocompatible ligands capped nanocrystals with bright fluorescence showed negligible photobleaching in fixed cells even after 40 min UV irradiation.This indicates that core-shell nanocrystals capped with L-Cysteine and Glutathione possess remarkably high resistance to photobleaching and oxidation.

关 键 词：近红外纳米晶体 冻解熔融 晶格错配 荧光稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]