(NH4)2MoS4引导CdTe QDs自组装及光学性质调控和细胞成像

doi:10.6023/A17090428

化学学报 ›› 2018, Vol. 76 ›› Issue (1): 43-48.DOI: 10.6023/A17090428 上一篇下一篇

研究论文

(NH₄)₂MoS₄引导CdTe QDs自组装及光学性质调控和细胞成像

孙权洪, 李智, 马楠

苏州大学材料与化学化工学部苏州 215123

投稿日期:2017-09-19 发布日期:2017-11-06
通讯作者: 马楠 E-mail:nan.ma@suda.edu.cn
基金资助:
项目受国家自然科学基金（Nos.21175147，91313302，21475093）、国家高技术研究发展计划（863计划，No.2014AA020518）和青年千人计划项目资助.

(NH₄)₂MoS₄-Guided Self-Assembly of CdTe QDs and Control over Their Optical Properties and Cell Imaging

Sun Quanhong, Li Zhi, Ma Nan

College of Chemistry, Chemical Engineering and Materials Science of Soochow University, Suzhou 215123

Received:2017-09-19 Published:2017-11-06
Contact: 10.6023/A17090428 E-mail:nan.ma@suda.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21175147, 91313302, 21475093), the National High Technology Research and Development Program of China (863 Program, No. 2014AA020518) and the Thousand Youth Talents Plan.

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摘要/Abstract

报道了一种简易、快速调节量子点荧光波长的方法.以GSH为配体水热法合成了发射波长为540 nm左右的绿色荧光CdTe量子点，通过（NH₄）₂MoS₄在加热和常温条件下引导CdTe量子点进行自组装.加热条件下，15 min内可以使发射波长迅速的红移100 nm以上.常温条件下，在48 h内可以缓慢的引导CdTe量子点进行自组装，发射波长缓慢红移70 nm以上.利用对比实验验证了（NH₄）₂MoS₄中的MoS₄^2-对引导CdTe量子点自组装具有特异性，并且构建了一个合理的自组装体的结构单元模型.在细胞成像领域，该自组装体具有潜在的应用前景.

关键词: CdTe量子点, (NH₄)₂MoS₄, 自组装, 模型, 细胞成像

Conventionally, red shift of QD photoluminescence (PL) could be achieved by growing QDs to larger sizes using hydrothermal method, which is usually a very slow process. We synthesized green fluorescent CdTe quantum dots with GSH as the ligand and proved the successful synthesis of (NH₄)₂MoS₄ by UV-Vis, X-Ray Diffraction, Raman spectroscopy. In the process of research, we found that (NH₄)₂MoS₄ can change the wavelength of CdTe quantum dots under the condition of heating or at room temperature. Redshift of emission wavelength can change with the different ratio between (NH₄)₂MoS₄and CdTe QDs. In this study, we report a rapid and convenient method to achieve red-shift of CdTe QD PL via (NH₄)₂MoS₄-guided QD self-assembly. We show that the emission wavelength of CdTe QDs underwent a red-shift of more than 100 nm for 15 min at 100℃ in the presence of (NH₄)₂MoS₄. At the same time, we conduct a experiment, which have no red-shift in the absence of (NH₄)₂MoS₄for 15 min at 100℃. This illustrates that the (NH₄)₂MoS₄ plays an important role in CdTe QDs self-assembly. The red-shift of QD PL was also observed at room temperature but relatively slower. The formation of QD assembly was confirmed by gel electrophoresis, transmission electron microscopy, and X-ray photoelectron spectroscopy. The result of gel electrophoresis and transmission electron microscopy directly shows the self-assembly morphology of CdTe QDs and the change of size and shape. Self-assembly entity was proved to contain Mo and Cd by the X-ray photoelectron spectroscopy, which confirmed the connection between (NH₄)₂MoS₄and CdTe QDs. A control experiment was conducted by replacing (NH₄)₂MoS₄with Na₂S for QD assembly, in that case no apparent change of emission wavelength was observed. These results reveal that MoS₄^2- within (NH₄)₂MoS₄ is crucial for self-assembly of CdTe QDs. Accordingly, we propose a reasonable model of (NH₄)₂MoS₄-guided CdTe QD self-assembly. In this model, we consider the connection between a (NH₄)₂MoS₄ and two CdTe QDs in ideal condition. With the increasing ratio of (NH₄)₂MoS₄, much more connection between (NH₄)₂MoS₄ and CdTe will be obtained. Assembling entity morphology changed with different cross-linking way. The resulting QD assembly was further applied to cell imaging experiments, demonstrating their potentials in this field.

Key words: CdTe QDs, (NH₄)₂MoS₄, self-assembly, model, cell imaging

引用此文

孙权洪, 李智, 马楠. (NH₄)₂MoS₄引导CdTe QDs自组装及光学性质调控和细胞成像[J]. 化学学报, 2018, 76(1): 43-48.

Sun Quanhong, Li Zhi, Ma Nan. (NH₄)₂MoS₄-Guided Self-Assembly of CdTe QDs and Control over Their Optical Properties and Cell Imaging[J]. Acta Chim. Sinica, 2018, 76(1): 43-48.

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(NH₄)₂MoS₄引导CdTe QDs自组装及光学性质调控和细胞成像

(NH₄)₂MoS₄-Guided Self-Assembly of CdTe QDs and Control over Their Optical Properties and Cell Imaging

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