Citation: 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 Chimica Sinica, ;2018, 76(1): 43-48. doi: 10.6023/A17090428 shu

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

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

Corresponding author: Ma Nan, nan.ma@suda.edu.cn
Received Date: 19 September 2017
Available Online: 6 January 2017
Fund Project: the National Natural Science Foundation of China 21175147the National Natural Science Foundation of China 91313302Project 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 Planthe National Natural Science Foundation of China 21475093the National High Technology Research and Development Program of China 863 Programthe National High Technology Research and Development Program of China 2014AA020518

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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)₂MoS₄ for 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.
- CdTe QDs,
- (NH₄)₂MoS₄,
- self-assembly,
- model,
- cell imaging
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(NH₄)₂MoS₄-Guided Self-Assembly of CdTe QDs and Control over Their Optical Properties and Cell Imaging