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Method for embedding cadmium selenide quantum dots in mesoporous titanium dioxide framework

A technology of mesoporous titanium dioxide and cadmium selenide, which is applied in the field of materials, can solve problems such as luminescence quenching, and achieve the effects of easy operation, uniform particle dispersion, and good crystallinity

Inactive Publication Date: 2012-09-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Coordination unsaturated atoms and vacancies generally exist on the surface of CdSe quantum dots, which are easily affected by the external environment and cause their luminescence to be quenched.

Method used

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  • Method for embedding cadmium selenide quantum dots in mesoporous titanium dioxide framework
  • Method for embedding cadmium selenide quantum dots in mesoporous titanium dioxide framework
  • Method for embedding cadmium selenide quantum dots in mesoporous titanium dioxide framework

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Dissolve titanium tetrachloride with a molar mass of 0.015 mol and F127 with a mass of 1.5g in 19ml of ethanol solution, stir, add 0.023g (0.075mmol), 0.07g (0.23mmol), 0.14g, respectively (0.45mmol), 0.2lg (0.68mmol), 0.23g (0.75mmol) of cadmium nitrate to obtain B solution.

[0032] (2) Pour solution B into a watch glass and age it in an oven at 40°C for 4 days to form a gel;

[0033] (3) Put the gel in a muffle furnace and roast at 400°C for 4 hours.

[0034] (4) Put the roasted sample in a volumetric flask with 10ml of 0.05mol / L Na 2 SeSO 3 The solution was stirred for 10 hours under dark conditions for ion exchange, and finally the sample was washed and dried and collected.

[0035] The TEM spectrum of the framework morphology of the mesoporous titanium dioxide embedded with cadmium selenide quantum dots obtained by the above-mentioned solvent volatilization-induced self-assembly technology is as follows figure 1 As shown, it can be seen from the figure that the quantu...

Embodiment 2

[0040] (1) The amount of cadmium nitrate is 0.07g (0.23mmol), Na 2 SeSO 3 The concentration of the solution is 0.05mol / L, the amount is 10ml, and the rest is the same as in Example 1.

[0041] (2) The amount of cadmium nitrate is 0.14g (0.45mmol), Na 2 SeSO 3 The concentration of the solution is 0.1 mol / L, the dosage is 15 ml, and the rest is the same as in Example 1.

[0042] (3) The amount of cadmium nitrate is 0.2lg (0.68mmol), Na 2 SeSO 3 The concentration of the solution is 0.2mol / L, the dosage is 15ml, and the rest is the same as in Example 1.

[0043] (4) The amount of cadmium nitrate is 0.23g (0.75mmol), Na 2 SeSO 3 The concentration of the solution is 0.2mol / L, the dosage is 15ml, and the rest is the same as in Example 1.

[0044] The microstructure and crystallinity results of the obtained product are the same as those of Example 1. The diffuse reflection results indicate that the sample has a visible light response.

Embodiment 3

[0046] Repeat the operation steps of Example 1, the difference is that it is baked in a muffle furnace and baked at 350°C for 4 hours. The result is similar to that of Example 1, but the organic matter in the sample is not completely removed. The microstructure of the sample is consistent with that of Example 1, the crystallinity is consistent with that of Example 1, and the diffuse reflection results indicate that the sample has a visible light response.

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Abstract

The invention relates to the material field and discloses a method for embedding cadmium selenide quantum dots in a mesoporous titanium dioxide framework. The method utilizes solvent volatilization induction self assembly technology and includes the following steps: first preparing a precursor solution containing a titanium source, a cadmium source and a surfactant, conducting aging to obtain gel, then removing organics in a sample through roasting and finally conducting ion exchange processing with a solution containing a selenium source to obtain the cadmium selenide quantum dots embedded in the mesoporous titanium dioxide framework. An obtained product has good crystallinity degree and has obvious crystal lattices and visible light effects. The method is simple in preparation, convenient to operate, mild in condition and suitable for preparing monodisperse CdSe quantum dots with passivated surface and regular feature.

Description

Technical field [0001] The invention relates to the field of materials, in particular to a method for embedding cadmium selenide quantum dots in a mesoporous titanium dioxide framework, and particularly relates to a method for embedding cadmium selenide quantum dots into a mesoporous titanium dioxide framework by using a solvent volatilization-induced self-assembly technique. Background technique [0002] Group II-VI and III-V semiconductor nanoparticles, also known as semiconductor quantum dots, such as CdSe, CdS, CdTe and GaAs. Because of its significant quantum size effect, it has broad application prospects in solar cells, lasers, and bioluminescent labels. Among them, CdSe has a large forbidden band width (Eg=117eV), which is a better solar cell material; in addition, CdSe has good photoconductivity, and is also an excellent room temperature nuclear radiation detection material and nonlinear optics material. [0003] CdSe quantum dots generally have coordinated unsaturated a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J35/10
Inventor 李和兴张鹏李贵生张碟青
Owner SHANGHAI NORMAL UNIVERSITY
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