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A method for synthesizing green fluorescent gold nanoclusters stabilized by mercapto-β-cyclodextrin and its application

A technology of gold nanoclusters and green fluorescence, applied in the field of nanometers, can solve the problems of application limitations, no selectivity, few gold nanoclusters, etc., and achieve large Stokes shift, good photostability, and fluorescent spectrum tune effect

Active Publication Date: 2021-08-13
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The fluorescence properties of gold nanoclusters directly affect its application. At present, many literatures report the synthesis of fluorescent gold nanoclusters with various emission ranges, but most of them emit red fluorescence, and there are few studies on the synthesis of green gold nanoclusters;
[0007] 2. The properties of the stabilizer coated on the surface of metal nanoclusters also play an important role in the fluorescence properties of metal nanoclusters. Currently, commonly used stabilizers include oligonucleotides, polypeptides, proteins, and thiols, etc. , these substances are often not selective, which limits their application

Method used

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  • A method for synthesizing green fluorescent gold nanoclusters stabilized by mercapto-β-cyclodextrin and its application
  • A method for synthesizing green fluorescent gold nanoclusters stabilized by mercapto-β-cyclodextrin and its application
  • A method for synthesizing green fluorescent gold nanoclusters stabilized by mercapto-β-cyclodextrin and its application

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Experimental program
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Effect test

Embodiment 1

[0025] 1. At 90°C, add 5 mL of chloroauric acid tetrahydrate (HAuCl 4 4H 2 O, 1.0mM) and stirred for 10min, then added 2mL of mono(6-mercapto-6-deoxy)-β-cyclodextrin (6-SH-β-CD, 10mM) and stirred vigorously for 5min, in which HAuCl 4 4H 2 The molar ratio of O and 6-SH-β-CD is 1:4, and the system forms Au(I)-6-SH-β-CD compound at this time;

[0026] 2. Quickly add 1.5mL sodium hydroxide (NaOH, 1.0M) and stir for 4 hours, when a yellow precipitate is formed in the solution, it indicates that 6-SH-β-CD has been incorporated into Au(I)-6-SH-β-CD Part of the +1 gold was reduced to 0-valent gold, and finally formed gold nanoclusters Au(0)@Au(I)-6-SH-β-CD-AuNCs.

[0027] figure 1 It is the ultraviolet absorption spectrum and fluorescence excitation emission spectrum of gold nanoclusters. There is no absorption peak near 500nm in the ultraviolet absorption curve. It can be seen that what we synthesized is gold nanoclusters instead of gold nanoparticles. It can be seen from the flu...

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Abstract

According to the defects of the prior art, the present invention is committed to providing a rapid synthesis method to obtain novel green fluorescent gold nanoclusters; using mercapto-β cyclodextrin as a coating agent to synthesize gold nanoclusters, thereby making it selective Identifying the function of nitrophenols.

Description

technical field [0001] The invention belongs to the field of nanometer technology, and more specifically relates to a method for synthesizing mercapto-β-cyclodextrin-stabilized green fluorescent gold nanoclusters that can selectively recognize nitrophenols and its application. Background technique [0002] Gold nanoclusters have the advantages of good photostability, tunable fluorescence spectrum, good biocompatibility, and large Stokes shift, which make them widely used in biosensors, environmental monitoring, cell imaging, disease detection, drug delivery, etc. application prospects. [0003] At present, many literatures have reported the synthesis method of synthesizing gold nanoclusters: one is "etching" method, that is, through "etching" reagent or "etching" technology, the wrapped large-particle nanoparticles are broken or dissolved, The particle size of the nanoparticles is reduced to prepare gold nanoclusters that emit different light; the other is the chemical redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/58G01N21/33G01N21/64
CPCC09K11/025C09K11/58G01N21/33G01N21/643
Inventor 凌剑李钰文秋林
Owner YUNNAN UNIV