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CdTe quantum dot hierarchical structure and preparation method thereof

A technology of quantum dots and small molecules, which is applied in the field of CdTe quantum dot multilevel structure and its preparation, can solve the problems of unfavorable large-scale preparation, certain toxicity, environmental pollution, etc.

Active Publication Date: 2019-07-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the above preparation method, on the one hand, the raw material used - terephthalaldehyde, has certain toxicity and is easy to cause environmental pollution; on the other hand, the preparation conditions of another raw material of the preparation method - thioglycolic acid modified cadmium telluride quantum dots It is harsh and needs to be prepared under the condition of pH 10.95-11.05, which is not conducive to the large-scale preparation of products
[0008] Therefore, the multi-level structure of quantum dots is one of the effective means to improve the utilization rate of photogenerated carriers in quantum dots, but there are still challenges in how to realize the multi-level structure of quantum dots simply and efficiently.

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  • CdTe quantum dot hierarchical structure and preparation method thereof
  • CdTe quantum dot hierarchical structure and preparation method thereof
  • CdTe quantum dot hierarchical structure and preparation method thereof

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Effect test

Embodiment 1

[0036] (1) Preparation of CdTe quantum dots by aqueous phase method:

[0037] Sodium borohydride, tellurium powder, Cd(NO 3 ) 2 As a raw material, thioglycolic acid was used as a stabilizer to prepare a CdTe quantum dot colloidal solution in a nitrogen atmosphere, and the same volume of acetone was added to the clear and transparent solution obtained by the reaction, and centrifuged to obtain a CdTe powder sample.

[0038] (2) Preparation of CdTe quantum dot multi-level structure by organic small molecule assisted method:

[0039] Mix an equal volume of isopropanol with an equal volume of deionized water, slowly add 0.05M sodium hydroxide solution dropwise, adjust the pH to 12-13, take a 0.1 mmol CdTe quantum dot powder sample, and the molar ratio is CdTe:thioglycolic acid =1:2 mixed and dissolved in the above solution, condensed and refluxed for 2 hours at 80°C. CdTe quantum dot hierarchical structure powder samples were obtained by centrifugation.

[0040] figure 1 The ...

Embodiment 2

[0045] (1) Preparation of CdTe quantum dots by aqueous phase method:

[0046] Sodium borohydride, tellurium powder, Cd(NO 3 ) 2 As a raw material, thioglycolic acid was used as a stabilizer to prepare a CdTe quantum dot colloidal solution in a nitrogen atmosphere, and the same volume of acetone was added to the clear and transparent solution obtained by the reaction, and centrifuged to obtain a CdTe powder sample.

[0047] (2) Preparation of CdTe quantum dot multi-level structure by organic small molecule assisted method:

[0048] Mix an equal volume of ethanol with an equal volume of deionized water, slowly add 0.05M sodium hydroxide solution dropwise, adjust the pH to 12-13, take a 0.1mmol CdTe quantum dot powder sample, and use a molar ratio of CdTe:thioglycolic acid=1: 2 were mixed and dissolved in the above solution, and condensed and refluxed for 2 hours at 80°C. CdTe quantum dot hierarchical structure powder samples were obtained by centrifugation.

[0049] figure...

Embodiment 3

[0051] (1) Preparation of CdTe quantum dots by aqueous phase method:

[0052] Sodium borohydride, tellurium powder, Cd(NO 3 ) 2 As a raw material, thioglycolic acid was used as a stabilizer to prepare a CdTe quantum dot colloidal solution in a nitrogen atmosphere, and the same volume of acetone was added to the clear and transparent solution obtained by the reaction, and centrifuged to obtain a CdTe powder sample.

[0053] (2) Preparation of CdTe quantum dot multi-level structure by organic small molecule assisted method:

[0054] Mix an equal volume of isopropanol with an equal volume of deionized water, slowly add 0.05M sodium hydroxide solution dropwise, adjust the pH to 12-13, take a 0.1 mmol CdTe quantum dot powder sample, =1:2 mixed and dissolved in the above solution, condensed and refluxed for 2 hours at 80°C. CdTe quantum dot hierarchical structure powder samples were obtained by centrifugation.

[0055] image 3 For the SEM figure of the CdTe quantum dot multile...

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Abstract

The invention discloses a CdTe quantum dot hierarchical structure and a preparation method thereof. According to the preparation method, CdTe quantum dots and a small organic molecular coupling agentare used as raw materials to react at condensation reflux temperature under an alkaline condition in an alcohol-water mixed solution to obtain the quantum dot hierarchical structure; the small organicmolecular coupling agent is selected from mercaptoacetic acid or mercaptopropionic acid; in the alcohol-water mixed solvent, alcohol is selected from monohydric alcohol with carbon number of 1-6. Theprepared CdTe quantum dot hierarchical structure can improve the effect of photo-induced carrier diffusion distance of quantum dots and can be widely applied to the fields of solar cells, photocatalysis and the like.

Description

technical field [0001] The invention relates to the technical field of nano functional materials, in particular to a CdTe quantum dot multilevel structure and a preparation method thereof. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are a kind of luminescent nanoparticles. Compared with traditional organic fluorescent dyes, quantum dots have a wide excitation spectrum and continuous distribution, while the emission spectrum is symmetrically distributed and narrow in width. The color is adjustable, and the photochemical stability is high, and it is not easy to be photolyzed and other excellent optical properties. [0003] In recent years, based on the unique optical and electrical properties of semiconductor nanocrystals, it has been used in research fields such as light-emitting diodes, nanolasers, and polycrystalline thin-film solar cells, and its application as a fluorescent marker in the field of nanobiotechnology and biosensors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C09K11/88B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01B19/007C01P2004/16C01P2004/50C01P2004/61C01P2004/62C01P2004/64C09K11/883
Inventor 赵高凌卢王威李华正詹凌曈韩高荣
Owner ZHEJIANG UNIV