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A kind of gold nanoparticle-gold nanocluster composite material and its preparation method and application

A gold nanocluster, gold nanoparticle technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of strong reducing agent toxicity, complicated operation process, long nanoparticle time, etc., and reach the plasmon resonance absorption peak. The effect of enhancement, simple preparation method, good selectivity and sensitivity

Active Publication Date: 2022-07-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these strong reducing agents are toxic, and it takes a long time to synthesize nanoparticles; importantly, the synthesized gold nanoparticles cannot be directly used for ion detection or biological applications, and often need to be further modified to make them functional, which makes the operation process difficult. complex and cannot detect low concentrations of silver ions

Method used

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  • A kind of gold nanoparticle-gold nanocluster composite material and its preparation method and application
  • A kind of gold nanoparticle-gold nanocluster composite material and its preparation method and application
  • A kind of gold nanoparticle-gold nanocluster composite material and its preparation method and application

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preparation example Construction

[0029] The specific embodiment provides a preparation method of a gold nanoparticle-gold nanocluster composite material, comprising the following steps:

[0030] S1, the HAuCl 4 The aqueous solution and the galactose oxidase solution are mixed at 35-40 ° C for 2-5 min to obtain a mixed solution; the HAuCl 4 The concentration of the aqueous solution is 10-15mmol / L, and the concentration of the galactose oxidase solution is 1.5-25mg / mL;

[0031] S2, adjust the pH value of the mixed solution to 11.0-12.0 by sodium hydroxide solution; the concentration of the sodium hydroxide solution is 1-2mmol / L;

[0032] S3. The solution obtained in step S2 is reacted at 35-40° C. to obtain the gold nanoparticle-gold nanocluster composite material.

[0033] The specific embodiment also includes a gold nanoparticle-gold nanocluster composite material prepared by the above preparation method.

[0034] The specific embodiment also includes the gold nanoparticle-gold nanocluster composite materi...

Embodiment 1

[0041] This embodiment proposes a gold nanoparticle-gold nanocluster composite material, which is prepared by the following steps:

[0042] S1, 1mL, 10mmol / L HAuCl 4 The aqueous solution was mixed with 1 mL of 25 mg / mL galactose oxidase solution, and vigorously stirred at 37 °C for 2 min to obtain a mixed solution;

[0043] S2, add 1mmol / L NaOH solution to adjust the pH value of the mixture to 12.0;

[0044] S3. The solution obtained in step S2 is reacted in a 37° C. water bath for 24 hours to obtain a purple-red gold nanoparticle-gold nanocluster composite material (GNP-GOs-GNCs) solution.

[0045] combine figure 1 , the formation mechanism of GNP-GOs-GNCs is: chloroauric acid solution is mixed with galactose oxidase (GO) solution, under vigorous stirring, chloroauric acid enters the inner space of galactose oxidase, Au 3+ It is captured. 43 cysteine ​​residues in GO stabilize Au through strong Au-S bonds 3+ , forming GO-Au 3+ Complex. The pH of the mixture was adjuste...

Embodiment 2

[0048] The difference between the gold nanoparticle-gold nanocluster composite material prepared in this example and Example 1 is only that the concentration of the galactose oxidase solution is 1.5 mg / mL.

[0049] from image 3 It can be seen that the gold nanoparticles in the composites prepared by different concentrations of galactose oxidase are spherical particles with uniform shape and good dispersibility, and the higher the concentration of galactose oxidase, the smaller the particle size of the synthesized gold nanoparticles. Furthermore, we found some extremely small particles (GNPs) around some large nanoparticles (GNPs). image 3 b and image 3 e), zooming in on these small particles, we observe that some of these small particles are dispersed around the large nanoparticles, and some are even tightly adhered to the particle surface. We speculate that these extremely small particles may be gold nanoclusters (GNCs). and through image 3 c and image 3 f confirmed...

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Abstract

The invention discloses a gold nanoparticle-gold nanocluster composite material, a preparation method and application thereof, and belongs to the technical field of nanomaterials. The composite material is prepared by the following steps: S1, HAuCl 4 The aqueous solution is mixed with a galactose oxidase (GO) solution to obtain a mixed solution; S2, the pH value of the mixed solution is adjusted to 11.0-12.0; S3, the pH-adjusted mixed solution is reacted at 35-40 °C to obtain The gold nanoparticle-gold nanocluster composite material. The present invention also includes that the gold nanoparticle-gold nanocluster composite material is used for detecting Ag + applications in . The composite material can directly realize low-concentration Ag + detection.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a gold nanoparticle-gold nanocluster composite material and a preparation method and application thereof. Background technique [0002] Ag + Highly toxic to many bacteria, viruses, algae and fungi, Ag + Its antibacterial effect has been used in many fields such as cosmetics, wood, clinical materials and so on. However, Ag + As heavy metal ions, once the concentration is too high, it will bring harm to the environment and human health. The U.S. Environmental Protection Agency (EPA) sets the upper limit of silver ions in drinking water at 0.050 mg / L. Therefore, for Ag + The real-time monitoring and reliable analysis of data are of great significance for environmental protection and disease prevention. has been developed to detect Ag + The analytical methods include atomic absorption spectrometry, inductively coupled plasma mass spectrometry and electrochemical methods....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/054B82Y30/00B82Y40/00G01N21/31
CPCB22F9/24G01N21/31B82Y40/00B82Y30/00B22F1/07
Inventor 林亚维张黎屈德宇刘冉王成圣马纪兴吕敏
Owner WUHAN UNIV OF TECH
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