Aqueous-phase synthesis of Mn<2+> doped CdTe quantum dots

A technology of quantum dots and secondary water, which is applied in the field of preparing an in-situ doped CdTe:Mn quantum dot, which can solve the problems of time-consuming, limited application, and cumbersome preparation process

Inactive Publication Date: 2019-02-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, quantum dots will agglomerate under long-term laser irradiation, and its preparation process is tedious, time-consuming, and highly toxic, which limits its application in some fields.

Method used

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  • Aqueous-phase synthesis of Mn&lt;2+&gt; doped CdTe quantum dots
  • Aqueous-phase synthesis of Mn&lt;2+&gt; doped CdTe quantum dots
  • Aqueous-phase synthesis of Mn&lt;2+&gt; doped CdTe quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: In the experiment, CdTe:Mn QDs of different sizes can be obtained by controlling the reaction time, and its color changes from green to red, which also represents the growth of its particle size, reflecting the quantum size effect, such as figure 1 shown. The purified CdTe:MnQDs were ground to powder and characterized by Fourier transform infrared spectroscopy, the results are as follows figure 2 shown.

Embodiment 2

[0017] Example 2: Grinding the purified CdTe:Mn QDs to powder, using an X-ray diffractometer to scan its crystal structure in the range of 20°--80°, the obtained XRD data is as follows image 3 shown.

Embodiment 3

[0019] To explore the effect of different Mn contents on the fluorescence properties of CdTe:Mn QDs, the specific operation is as follows: set n(Cd 2+ ):n(Te 2- ):n(MPA)=1:0.5:2.4, T=100°C, pH=11, [Cd 2+ ]=1.25mM, set the molar ratio of Cd and Mn to be 1:0.2,1:0.4,1:0.8,1:1 respectively, use the fluorescence spectrophotometer to record its fluorescence emission spectrum to study the effect of Mn content on CdTe:Mn The effect of QDs performance, results such as Figure 4 shown;

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Abstract

The invention relates to preparation of in-situ doped CdTe:Mn quantum dots. The doped CdTe:Mn quantum dots are synthesized by aqueous-phase synthesis with sodium hydrogen telluride (NaHTe) as a precursor, cadmium chloride (CdCl2) as a cadmium source and manganese sulfate (MnSO4) as a manganese source. The material is characterized by a fluorospectrophotometer (FL), Fourier transform infrared spectroscopy (FTIR) and an X-ray diffractomer (XRD). The CdTe:Mn quantum dots with good fluorescence properties are obtained by adjusting the parameters affecting the quantum dots, such as the temperature,the pH value, the reaction time and the amount of reactants.

Description

technical field [0001] The invention belongs to the field of fluorescent probes and preparation thereof, in particular to an experimental method for preparing an in-situ doped CdTe:Mn quantum dot. Background technique [0002] Quantum dots are a class of nanocrystalline media, which are between single molecules and three-dimensional materials. Compared with organic dyes, quantum dots have many outstanding advantages, including adjustable quantum size, high extinction coefficient, high fluorescence quantum yield, and light emission. Good stability etc. Mn is a transition metal element. Doping Mn into quantum dots can effectively reduce the toxicity of quantum dots, which has become one of the research hotspots in recent years. Moreover, quantum dots are cubic crystals, and their surface chemical potential is high, which is more conducive to Adsorbed ion doping. As fluorescent probes, quantum dots have good selectivity and high sensitivity, can simultaneously detect multiple...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/881G01N21/643
Inventor 张纪梅张丽萍朱海彬郝帅帅谢博尧毕明刚雷思宇魏俊伟
Owner TIANJIN POLYTECHNIC UNIV
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