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Method of coating MOF to improve photostability of gold nanocluster and application thereof

A technology of gold nanoclusters and photostability, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that ligands and surfactants are difficult to remove, gold nanoclusters light Problems such as poor stability and limited scope of application of traditional methods have achieved good application prospects, easy large-scale promotion and application, and improved photostability

Active Publication Date: 2018-06-29
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing in-situ coating methods need to modify the surface of the guest material or wrap surfactants (such as: polyvinylpyrrolidone, cetyltrimethylammonium bromide, etc.) to promote the interaction between the guest material and the MOFs precursor. However, the surface-modified ligands and surfactants are often difficult to remove, thus affecting the properties of the guest material itself
[0004] In summary, the photostability of gold nanoclusters is poor, the scope of application of traditional methods is limited, and the problem of easy agglomeration under light cannot be fundamentally solved.

Method used

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  • Method of coating MOF to improve photostability of gold nanocluster and application thereof
  • Method of coating MOF to improve photostability of gold nanocluster and application thereof
  • Method of coating MOF to improve photostability of gold nanocluster and application thereof

Examples

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Effect test

Embodiment 1

[0035] A metal-organic framework-coated gold nanocluster (Au x @ZIF-8) composite material, which was prepared by the following steps: 48.5mg HAuCl 4 4H 2 O was dissolved in 30mL of water, then 50mg of reduced glutathione was added, stirred for 2h until the solution was colorless, and then reacted at 70°C for 24h to obtain a yellow gold nanocluster solution; to the yellow gold nanocluster solution 90mL of acetonitrile was added as a precipitating agent, and the precipitate was separated after centrifugation at 8000rpm for 5min, and the precipitate was washed 3 times with the solution of acetonitrile / water=3 / 1 (volume ratio), and dried to obtain pure solid gold nanoclusters; Solid gold nanoclusters (Au x ) was dispersed into 25 mL of water by ultrasonication at 90 Hz for 30 minutes to form a gold nanocluster dispersion; the formed gold nanocluster dispersion was cooled to 0° C. with an ice-water bath, 410 mg of 2-methylimidazole was added thereto, and stirred until dissolved. ...

Embodiment 2

[0039] A metal-organic framework-coated gold nanocluster Au x @ZIF-67 composite material, which was prepared by the following steps: 48.5mg HAuCl 4 4H 2 O was dissolved in 30mL of water, then 50mg of reduced glutathione was added, stirred for 2h until the solution was colorless, and then reacted at 70°C for 24h to obtain a yellow gold nanocluster solution; to the yellow gold nanocluster solution 90mL of acetonitrile was added as a precipitating agent, and the precipitate was separated after centrifugation at 8000rpm for 5min, and the precipitate was washed 3 times with the solution of acetonitrile / water=3 / 1 (volume ratio), and dried to obtain pure solid gold nanoclusters; Solid gold nanoclusters (Au x ) was dispersed into 25 mL of water by ultrasonication at 90 Hz for 30 minutes to form a gold nanocluster dispersion; the formed gold nanocluster dispersion was cooled to 0° C. with an ice-water bath, 600 mg of 2-methylimidazole was added thereto, and stirred until dissolved. ...

Embodiment 3

[0043] A metal-organic framework-coated gold nanocluster (Au x @ZIF-8) composite material, which was prepared by the following steps: 164.7mg HAuCl 4 4H 2 O was dissolved in 5 mL of water, 255.8 mg of tetraoctyl ammonium bromide was dissolved in 10 mL of toluene, the two solutions were mixed, vigorously stirred for 15 min, the water phase was separated by standing, the oil phase was collected, and the N 2 30min, and cooled to 0°C, adding phenethanethiol in an equimolar amount to gold, stirring at a low speed for 1h to obtain a colorless solution; then quickly adding 155mg NaBH to the colorless solution under rapid stirring 4 , N 2 Stir overnight under protection, wash three times with absolute ethanol, and dry to obtain pure solid gold nanoclusters; then solid gold nanoclusters (Au x ) was dispersed into 25mL water with 90Hz ultrasound for 30min to form a gold nanocluster dispersion; the formed gold nanocluster dispersion was cooled to 0°C with an ice-water bath, 1.64g of ...

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Abstract

The invention discloses a method of coating a MOF to improve photostability of a gold nanocluster and application thereof. The method includes following steps: coating the surface of the gold nano cluster with a thin-layer metal organic frame in situ in a liquid-phase manner to serve as a coating layer, wherein the metal organic frame is made of a zeolite imidazate skeleton structure amterial, andthickness of the coating layer is 0.5-10nm. The invention further discloses a metal organic frame coated gold nanocluster composite material prepared by the method and application thereof in photocatalytic reduction CO2 reaction. The method has the advantages that an in-situ growing method is adopted to coat the thin-layer MOF, and the gold nanocluster is directly coated with the MOF without through surface modifying, so that photostability of the gold nanocluster is improved. The method is a low-temperature liquid-phase wet-process synthesis method, so that performance of the gold nanocluster is unaffected. The method is simple in process, mild in reaction condition, high in controllability, low in energy consumption and easy in large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, and more specifically relates to a method for coating a metal-organic framework (MOF) to improve the photostability of gold nanoclusters and its application. Background technique [0002] Gold (Au) nanoclusters are small particles formed by stacking several to hundreds of gold atoms. Their size is equivalent to the Fermi wavelength. , fluorescent labeling, biochemical sensing, optoelectronic materials and other fields have potential application prospects. However, due to its extremely small size and high surface energy, gold nanoclusters will agglomerate under light conditions to form gold nanoparticles, thus losing their unique optical properties. Liu et al. prepared gold nanoparticles by light-induced aggregation of gold nanoclusters [ACS Appl. Mater. Interfaces, 2015, 7, 28105–28109]. Au nanoclusters used as powdered TiO by P.V.Kamat et al. 2 As a sensitizer for photocataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C25B11/06B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C25B11/091B22F1/102
Inventor 崔晓峰凌山吴健周煜王钧伟秦伟张元广
Owner ANQING NORMAL UNIV
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