Red fluorescence gold nanocluster as well as preparation method and application thereof

A gold nanocluster, red fluorescence technology, applied in the direction of fluorescence/phosphorescence, material analysis by optical means, measurement device, etc., can solve the complex and difficult synthesis steps, cannot well eliminate autofluorescence and scattered light, cannot be applied Biological applications and other issues, to achieve the effects of low toxicity fluorescence properties, green reaction conditions, no pollution, and low detection limits

Inactive Publication Date: 2016-04-27
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CdS quantum dots are used to detect low-level mercury ions. Although these quantum dot detection methods are sensitive, their synthesis steps are complicated and difficult for the detection of toxic metals in the environment; CdTe quantum dots are used to detect GSH, and the short excitation wavelength causes its own The high fluorescence background prevents this material from being used in some biological applications. Even if near-infrared probes are made, they cannot be widely used because they cannot eliminate autofluorescence and scattered light well.

Method used

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  • Red fluorescence gold nanocluster as well as preparation method and application thereof
  • Red fluorescence gold nanocluster as well as preparation method and application thereof
  • Red fluorescence gold nanocluster as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] Preparation of Red Fluorescent Gold Nanoclusters by Egg White Reduction and Coating

[0041] Aqua regia (V HCl :V HNO3 =3:1) Soak and wash, then rinse with distilled water and dry for later use. First, carefully extract the egg white from fresh eggs, take 4mL of egg white solution and add it to a beaker, add an appropriate amount of water and start stirring for 10 minutes. Centrifuge at 7000rpm for 20min, take it out after centrifugation, collect the supernatant into a 100mL volumetric flask, and finally dilute to 100mL, put it in a 4°C refrigerator for later use. Weigh 206.0mg tetrachloroauric acid (HAuCl 4 4H 2 O), prepare the HAuCl of 0.01M concentration in brown 50mL volumetric flask 4 solution and refrigerated at 4°C for later use. Prepare 10 mL of 1M NaOH solution. Take 1mL of prepared HAuCl 4 The solution was diluted to 4mL with distilled water, 2mL was placed in a 10mL microwave glass reactor, and 4mL of the diluted egg white solution was added, stirred on...

Embodiment 2

[0043] (1) UV and fluorescence characterization of gold nanocluster AuNCsEW

[0044] Figure 2A It was observed that the synthesized material showed a light brown color under the fluorescent lamp. In order to confirm what kind of fluorescence the synthesized material emits, put the synthesized material under the ultraviolet lamp, and observed a strong red fluorescence; take 2mL of distilled water in the ultraviolet cup Then take 200 μL of the prepared AuNCs solution in the UV cup, add 1800 μL of distilled water to it for dilution, and measure the UV absorption curve. The results show that the substance has no exact absorption peak, but it starts from 400nm The substance has absorption; different excitation peaks are changed on the fluorescence spectrometer to determine the best emission peak position and intensity. The results show that the best excitation position is 320nm, and the best emission peak is 650nm.

[0045] (2) Transmission electron microscope analysis spectrum ...

Embodiment 3

[0058] Application of AuNCsEW as a fluorescent paint and its dyeing agent

[0059] Fill the gold nanocluster storage solution into a pen and draw a familiar picture on the filter paper, which is colorless under the fluorescent lamp, but placed under the ultraviolet lamp and excited with 365nm light, such as Figure 3A It shows that under the irradiation of ultraviolet light, the pattern drawn with a pen is bright red; the filter paper is placed in the gold nanocluster storage solution, taken out after half an hour, dried in an oven, and then taken out for origami, similarly, Origami is colorless under fluorescent lamps, but it is excited with 365nm light when placed under ultraviolet lamps, such as Figure 3B showed that the origami appeared bright red under the irradiation of ultraviolet light.

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Abstract

The invention provides a red fluorescence gold nanocluster as well as a preparation method and an application thereof and belongs to preparation and applications of fluorescence nano materials. According to the preparation method, cheap egg white is used for rapidly reducing and coating HAuCl4, and gold nanocluster AuNCs@EW giving red fluorescence is synthesized. The preparation method is simple, rapid and low in cost. The prepared nanocluster can be used as fluorescent dye, can be used for detecting mercury ions and further can be used for detecting GSH (glutathione).

Description

technical field [0001] The invention relates to fluorescent nanomaterials, in particular to a red fluorescent gold nanocluster and a preparation method thereof, and the use of the nanocluster in making fluorescent dyes and dyeing agents, making test paper for detecting mercury ions, and detecting glutathione (GSH) in the application. Background technique [0002] As we all know, mercury is an important heavy metal element, which widely exists in nature, such as water, soil and food. Mercury ion is a highly toxic and widespread pollutant ion even at a very low concentration, which is harmful to the human body. And one of the most threatening heavy metal elements in nature, it can seriously damage the digestion, excretion, and even the central nervous system in the human body, causing many serious diseases, such as tremors, deafness, arthritis, loss of muscle coordination, and loss of sensory control , memory loss, and movement disorders. Therefore, finding a fast and accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402G01N21/6458
Inventor 李英奇田露
Owner SHANXI UNIV
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