Preparation method and application of double-color fluorescent gold-copper composite nano-cluster

A dual-color fluorescence, nano-cluster technology, applied in fluorescence/phosphorescence, material analysis by optical means, measurement devices, etc., can solve the problems of expensive operation of instruments, long analysis cycle, cumbersome and other problems, and achieve high sensitivity, low cost, and sensitivity. And the effect of accurate detection

Inactive Publication Date: 2017-10-24
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional detection methods such as atomic spectroscopy, electrochemical analysis, etc. are difficult to meet the needs of practical applications due to expensive instruments, cumbersome operations, and long analysis cycles.

Method used

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  • Preparation method and application of double-color fluorescent gold-copper composite nano-cluster
  • Preparation method and application of double-color fluorescent gold-copper composite nano-cluster
  • Preparation method and application of double-color fluorescent gold-copper composite nano-cluster

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Embodiment 1

[0025] Preparation and compositional analysis of gold-copper composite nanoclusters. Take a clean round-bottomed flask, place it on a magnetic stirrer, add about 8.7mL of double-distilled water, 1mL of chloroauric acid solution with a concentration of 0.02mol / L, and then add 1mL with a concentration of 0.02mol / L L of copper nitrate solution, then slowly add 300 μL of glutathione solution with a concentration of 0.1mol / L, heat, stir and reflux in an oil bath at 80°C for 24 hours, the solution changes from white turbidity to colorless and clear, and then gradually Turn into golden yellow, dialyze the solution with secondary water (molecular weight cut-off 1000), and the obtained solution is a pure solution of gold-copper nanoclusters, which emits orange-yellow light under the irradiation of an ultraviolet light source, and its fluorescence spectrum is excited at a wavelength of 350nm. There are strong emission peaks at 450nm and 580nm. The ultraviolet-visible spectrum and fluor...

Embodiment 2

[0027] Take 17 4ml centrifuge tubes, mark them with numbers A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, and Q, Add 3 mL of gold-copper composite nanocluster aqueous solution to 17 centrifuge tubes, and then add 30 μL of 10 -4 M different metal ions and double distilled water Mg 2+ 、Co 2+ 、Cu 2+ , Ca 2+ 、Na + 、Ag + , Fe 3+ 、Cd 2+ 、H 2 O, Al 3+ , Mn 2+ , Zn 2+ 、Cr 3+ 、Ni 2 + , Pb 2+ , Hg 2+ 、K + After reacting for a period of time, the solution in the centrifuge tube was tested in a fluorescence spectrophotometer successively, and the fluorescence quenching value of the gold-copper composite nanocluster was recorded ( image 3 ).

[0028] Take 8 centrifuge tubes and mark them with numbers A, B, C, D, E, F, G, and H respectively, add 3mL carbon dot aqueous solution to the 8 centrifuge tubes with numbers A~H, and then add them to the centrifuge tubes in sequence 30 μL of ultrapure water and a concentration of 1.0 x 10 -10 , 1.0×10 -9 , 1.0×10 -8 , 1.0×10 ...

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Abstract

The invention discloses a preparation method and application of a double-color fluorescent gold-copper composite nano-cluster. The double-color fluorescent gold-copper composite nano-cluster is prepared from the raw materials, namely a chloroauric acid solution, a copper nitrate solution and glutathione by virtue of an oil-bath heating method. The double-color fluorescent gold-copper composite nano-cluster has the double-color fluorescent properties of emitting blue fluorescence (450nm) and orange red fluorescence (570nm) under the stimulation of a single wavelength, the blue fluorescence is hardly influenced by metal ions, and the intensity of the orange red fluorescence can be decreased or even the orange red fluorescence can be quenched by virtue of mercury ions and mercury compounds. Based on the characteristic, a fluorescence detection technique for detecting the mercury ions and the mercury compounds by virtue of a rate type fluorescence probe is constructed. The preparation method is simple, convenient and low in cost, the double-color fluorescent gold-copper composite nano-cluster has excellent fluorescent and chemical stabilities, and the disadvantages that a traditional dye is short in fluorescent lifetime, easy to photobleach and the like can be overcome; and a rate type fluorescent method is high in sensitivity and good in stability, does not require expensive instrument, can be applied to environmental monitoring and analysis and has wide application prospects.

Description

technical field [0001] The invention relates to a preparation method of a two-color fluorescent gold-copper composite nanocluster, based on the fact that the gold-copper composite nanocluster can emit two different colors of fluorescence under the excitation of a single wavelength of light, and realize the ratiometric fluorescent probe to mercury ions and mercury compounds. high-sensitivity detection. Background technique [0002] With the emergence of more and more preparation methods of nanomaterials, noble metal nanoclusters have become an increasingly important class of materials. As a new type of nanomaterial discovered in recent years, metal nanoclusters are generally relatively stable nanostructures composed of several to dozens of metal atoms, and their size is generally several nanometers. When the particle size of nanoclusters is equivalent to the Fermi wavelength of electrons, due to the quantum size effect, the energy levels become discontinuous, and they can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 黄昊文张凌阳谭芳谢小雪邓克勤夏晓东
Owner HUNAN UNIV OF SCI & TECH
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