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Preparation method of nanocrystalline superlattice material

A nanocrystalline and superlattice technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of restricting the industrial application of nanocrystalline superlattice, high requirements for experimental conditions and experimental equipment, and achieve low requirements for experimental equipment , the effect of improving the preparation efficiency

Pending Publication Date: 2022-07-26
JIAXING UNIV
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Problems solved by technology

However, the above preparation methods usually require strict control of solvent volatilization rate, solvent diffusion rate and annealing rate, and the assembly process often takes hours or even days (Nat.Commun.2020, 11, 3821; J.Am.Chem.Soc .2010,132,1,289-296; Nature2014,505,73-77), and the requirements for experimental conditions and experimental equipment are relatively high, which seriously limits the industrial application of nanocrystalline superlattice

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  • Preparation method of nanocrystalline superlattice material
  • Preparation method of nanocrystalline superlattice material
  • Preparation method of nanocrystalline superlattice material

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preparation example Construction

[0030] A preparation method of nanocrystalline superlattice material, the steps are as follows:

[0031] (1) Gold nanoparticles, silver nanoparticles, platinum nanoparticles, silica nanoparticles, Ferric oxide nanoparticles or cadmium telluride quantum dots are dispersed in deionized water to obtain a monodisperse nanocrystal aqueous solution with a concentration of 10-50nM;

[0032] (2) adding the inorganic salt (potassium carbonate, sodium carbonate, ammonium carbonate, potassium sulfate, sodium sulfate, ammonium sulfate or magnesium sulfate) solution with a concentration of more than 2M to the monodisperse nanocrystalline aqueous solution obtained in step (1), making the solution The concentration of the inorganic salt in the medium is above 1.0M, and after mixing evenly, let it stand at room temperature (25°C) for 10-20min to obtain disordered aggregates;

[0033] (3) Add deionized water to the disordered aggregates obtained in step (2), so that the inorganic salt concent...

Embodiment 1

[0035] A preparation method of nanocrystalline superlattice material, the steps are as follows:

[0036] (1) A solution of sulfhydryl-modified polyethylene glycol (number average molecular weight 1000) with a concentration of 1 mM was added to a solution of gold nanospheres (average diameter of 20 nm) with a concentration of 1.2 nM, wherein the sulfhydryl-modified polyethylene glycol The molar ratio with gold nanospheres was 5000:1, and after mixing uniformly, the reaction was carried out at 25 °C for 24 h, and the polyethylene glycol-modified gold nanospheres (PEG@NPs) were obtained by ligand exchange;

[0037] (2) centrifugally washing the polyethylene glycol-modified gold nanospheres obtained in step (1) for three times and then dispersing them into deionized water to obtain a monodisperse nanocrystal aqueous solution with a concentration of 20 nM;

[0038] (3) adding a potassium carbonate solution with a concentration of 2M to the monodisperse nanocrystalline aqueous solut...

Embodiment 2

[0050] A preparation method of a nanocrystalline superlattice material is basically the same as that of Embodiment 1, except that the potassium carbonate concentration in the system after adding deionized water in step (4) is 0.83M, and the final obtained nanocrystalline superlattice materials such as Figure 4 shown.

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Abstract

The invention relates to a preparation method of a nanocrystal superlattice material, which comprises the following steps: adding an inorganic salt (soluble carbonate or soluble sulfate) solution into a monodisperse nanocrystal aqueous solution (obtained by dispersing nanoparticles modified by nonionic water-soluble polymers into deionized water), so that the concentration of the inorganic salt in the solution is 1.0 M or above; uniformly mixing, and standing at room temperature for 10-20 minutes to obtain a disordered aggregate; and adding deionized water into the obtained disordered aggregate to enable the concentration of inorganic salt in the system to be 0.60-0.85 M, uniformly mixing, and standing at room temperature for 30-60 minutes to obtain the nanocrystalline superlattice material. According to the preparation method of the nanocrystalline superlattice material, the time for assembling the highly-ordered nanocrystalline superlattice from the monodispersed nanoparticles is short, the preparation efficiency of the nanocrystalline superlattice is remarkably improved, the requirement for experimental equipment is low, and the nanocrystalline superlattice material is expected to be produced in batch.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a preparation method of a nanocrystalline superlattice material. Background technique [0002] Nanocrystalline superlattice refers to a new type of functional material obtained by the bottom-up controllable and orderly assembly of functional nanoparticles through the interaction of themselves or surface ligands. It is well known that noble metal nanoparticles such as gold, silver, platinum, etc., due to their abundant free electrons, can generate strong electromagnetic field enhancement under light conditions, which makes them have unique localized surface plasmon resonance (LSPR) properties. Compared with isolated nanoparticles and disordered nanoparticle assemblies, highly ordered noble metal nanocrystal superlattice materials can further enhance the surface plasmon resonance effect due to the near-field coupling between particles. It has important application prosp...

Claims

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Application Information

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IPC IPC(8): B22F9/16B22F1/054B22F1/06
CPCB22F9/16
Inventor 杜艳秋李海东姜旸程凤梅
Owner JIAXING UNIV
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