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A kind of silicon quantum dot and its preparation method and application

A technology of silicon quantum dots and quantum dot solution, applied in the field of silicon quantum dots and their preparation, can solve the problems of complicated and lengthy process, rivalry of semiconductor silicon quantum dots, etc., and achieves simple and fast operation process, excellent water solubility, and abundant and easy-to-obtain raw materials. Effect

Active Publication Date: 2019-03-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream methods for preparing silicon quantum dots are usually top-down and bottom-up methods. Generally speaking, it is necessary to use HF to etch silicon-containing oxides or plasma-related equipment, and the process is complicated and lengthy.
Moreover, the quantum efficiency of silicon quantum dots prepared by relatively mature preparation methods is mostly in the range of 10-30%, which is still not comparable to that of semiconductor silicon quantum dots.

Method used

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  • A kind of silicon quantum dot and its preparation method and application
  • A kind of silicon quantum dot and its preparation method and application
  • A kind of silicon quantum dot and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing silicon quantum dots, comprising the following steps:

[0042] ①Weigh 1.86g of sodium citrate dihydrate, add 40mL of deionized water to fully stir to dissolve, and then bubble nitrogen for 30min.

[0043] ② Measure 10mL of 3-aminopropyltrimethoxysiloxane, add it to the solution of sodium citrate, stir well for 10min, then transfer the solution into a microwave reaction tank.

[0044] ③ Set the reaction temperature to 160°C and the reaction time to 15 minutes.

[0045] ④ After the solution was cooled to room temperature, the crude product was taken out, transferred into a dialysis bag with a molecular weight cut-off of 1 kDa, and the water was replaced every 4 hours to ensure that the total dialysis time was 12 hours to obtain a silicon quantum dot solution.

[0046] ⑤ Place the silicon quantum dot solution obtained above in a freeze dryer, set the cooling temperature to minus 40° C., and dry for 72 hours; obtain silicon quantum dots.

[0047] Af...

Embodiment 2

[0049] The same steps as in Example 1 were taken to prepare silicon quantum dots, except that the sodium citrate dihydrate in Example 1 was replaced with 1.40 g of citric acid, and other reaction conditions were not changed.

[0050] Through TEM characterization, it is shown that the particle morphology is uniform, and the average particle diameter is about 2.5nm, and its particle diameter is slightly increased compared with the product obtained in Example 1; the absolute quantum efficiency measured value is 13.37%; the solution after dialysis is placed for 15 Precipitation occurs after more than 1 day, the particle agglomeration phenomenon is serious, and the storage stability is not good, indicating that its surface groups are relatively complex.

Embodiment 3

[0052] Take the same steps as in Example 1 to prepare silicon quantum dots, the difference is that the 3-aminopropyltrimethoxysiloxane in Example 1 is replaced with 10mL of N-β (aminoethyl)-γ-aminopropyl Triethoxysilane, other reaction conditions were not changed.

[0053] After TEM characterization, it shows that the particles have a uniform shape and an average particle size of about 2.4nm; the absolute quantum efficiency is 65.09%; the solution after dialysis is placed for more than 15 days to precipitate, the particle agglomeration is serious, and its storage stability is not good. It shows that its surface groups are more complex.

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Abstract

The invention relates to a silicon quantum dot as well as a preparation method and application thereof and belongs to the field of fluorescent functional nanometer materials. The method comprises the following steps: uniformly mixing a silane coupling agent, a reducing organic acid and deionized water according to a ratio, introducing inert gases for bubbling, and performing microwave-assisted heating, so as to successfully obtain the silicon quantum dot with ultrahigh quantum efficiency, excellent water solubility and excellent fluorescence property. The silicon quantum dot disclosed by the invention can achieve great significance in the field of heavy metal ion detection, particularly in real-time monitoring of Cr (VI) of drinking water and industrial wastewater, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of fluorescent functional nanometer materials, and in particular relates to a silicon quantum dot and its preparation method and application. Background technique [0002] In recent years, the preparation technology of low-dimensional materials has been extensively and rapidly developed. In particular, quantum dot materials, as a quasi-zero-dimensional material, have attracted much attention because of their special advantages compared with bulk materials. But at the same time, on the other hand, traditional semiconductor quantum dots usually need to use heavy metal elements such as Pb and Cd, which are easy to cause secondary pollution to the surrounding environment, so it is imminent to find non-toxic and harmless next-generation alternative materials. [0003] However, silicon materials have the advantages of abundant and easy-to-obtain raw materials and large reserves on the earth. Nanomaterials prepared based on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/59G01N21/6428
Inventor 岳冬梅李旺谈静张立群
Owner BEIJING UNIV OF CHEM TECH
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