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Nanocrystal-ligand complex, preparation method and application thereof

A technology of nanocrystals and composites, applied in nanotechnology, nanotechnology, nano-optics, etc., can solve problems such as low-cost and high-solubility nanocrystal-ligand complexes, and achieve increased rotation entropy/bending entropy, High quantum efficiency and good chemical stability

Active Publication Date: 2017-12-29
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a nanocrystal-ligand complex, its preparation method and application thereof, so as to solve the problem that it is difficult to provide a low-cost and high-solubility nanocrystal-ligand complex in the prior art

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  • Nanocrystal-ligand complex, preparation method and application thereof

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preparation example Construction

[0042] In order for those skilled in the art to implement the present application more conveniently, the preparation method of the above-mentioned core-shell quantum dots is briefly described below. The preparation method includes: step S1, mixing the quantum dot core solution and the second cation precursor solution to form The second system; step S2, when the average diameter of the quantum dot core in the quantum dot core solution is greater than or equal to 2 times the minimum Bohr diameter of the holes or electrons of the quantum dot core composition material, at 210 ~ 280 ° C to the second The second anion precursor solution and the second fatty acid are added to the second system to perform epitaxial growth to obtain core-shell quantum dots, and the second anion precursor solution and the second fatty acid are added in batches to form the second product system; or, when When the average diameter of the quantum dot core in the quantum dot core solution is less than 2 time...

Embodiment 1

[0058]Synthesis of spherical CdSe quantum dots (average diameter 3.3nm) with the first exciton absorption peak at 550nm: CdO (0.0256g, 0.2mmol), HSt (stearic acid, 0.1420g, 0.5mmol) and ODE (octadecene , 4mL) into a 25mL three-neck flask, stirred for 10 minutes with argon, then heated up to 280°C to obtain a clear solution, then cooled to 250°C. 1 mL of selenium powder suspension with a concentration of 0.1 mmol / mL was quickly injected into the above-mentioned three-necked flask, and the reaction temperature was controlled at 250°C. After reacting for 7 minutes, quickly inject 0.05 mL of 0.1 mmol / mL selenium powder suspension into the three-necked bottle every 2 to 3 minutes until the size of the quantum dots reaches the target size, and stop heating immediately. During the reaction, the ratio of the total substance amount of the first cation precursor (Cd) to the total substance amount of the first anion precursor (Se) is 1:0.75. During the reaction process, a certain amount...

Embodiment 2

[0062] Synthesis of spherical CdSe (average diameter 4.2nm) quantum dots with the first exciton absorption peak at 590nm: CdO (0.0256g, 0.2mmol), tetradecanoic acid (0.1026g, 0.45mmol, as a short-chain ligand) and ODE (4mL) was put into a 25mL three-necked bottle, stirred and ventilated for 10 minutes, then heated to 280°C to obtain a clear solution, and the temperature was controlled at 250°C. Rapidly inject 1 mL of selenium powder suspension with a concentration of 0.05 mmol / mL into the three-neck flask, and control the reaction temperature at 240°C. After reacting for 5 minutes, add 0.1mL selenium powder concentration with the speed of 0.9mL / h and be 0.1mmol / mL and contain the selenium powder suspension of 1mmol / mL oleic acid (as long-chain ligand), drop above-mentioned containing 1mmol / mL After the selenium powder suspension of mL oleic acid, continue to react for 5 minutes. Then add the above-mentioned selenium powder suspension again, and circulate successively until th...

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Abstract

The invention provides a nanocrystal-ligand complex, a preparation method and application thereof. The nanocrystal-ligand complex comprises nanocrystals and at least two ligand forming surface coordination with nanocrystals, the ligand is unitary or polygonal carboxylic acid ligand, and C-chain skeletons of at least two ligand are different in chain length. The nanocrystal surface has at least two ligand, the interaction between different ligand is reduced, i.e., alternation of the molecular chains and packing of crystalloid can be reduced, a rotation entropy / bending entropy is increased, a C-Csigma conformation freedom degree between different ligand is sufficiently released, a vast dissolution entropy is generated, and the solubility of the nanocrystal can be increased; moreover, since the unitary or polygonal carboxylic acid ligand is lower than the cost of the branch-chain carboxylic acid ligand, a purpose of improving the solubility of the nanocrystal with low cost can be realized; and meanwhile, based on the chemical stability and good solubility of the unitary carboxylic acid, the nanocrystal-ligand complex has high quantum efficiency.

Description

technical field [0001] The invention relates to the field of quantum dot materials, in particular to a nanocrystal-ligand complex, its preparation method and its application. Background technique [0002] Nanocrystal-ligand complexes are a class of nanomaterials that are synthesized and dispersed in solution. Due to the size of the particles at the nanoscale (1-100 nm), the physicochemical properties of these particles are greatly different from those of their corresponding bulk materials. [0003] In the colloidal solution of nanoparticles, if there is no protection on the surface of the nanoparticles, these nanoparticles will tend to agglomerate, and the colloidal solution is in an unstable state and lacks research and practical significance. To obtain a stable colloidal solution of nanoparticles, it is first necessary to treat the surface of the solute-nanoparticles so that a layer of ligand is adsorbed on the surface of the nanoparticles as a protective layer to form a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F3/08C09K11/06C09K11/02B82Y20/00B82Y30/00B82Y40/00H01L51/42H01L51/46
CPCC09K11/02C09K11/06B82Y20/00B82Y30/00B82Y40/00C07F3/003H10K85/381H10K30/00Y02E10/549
Inventor 彭笑刚周健海苏叶华
Owner ZHEJIANG UNIV
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