Preparation method of golden nanoclusters emitting red fluorescence

A technology of gold nanoclusters and fluorescent gold nanometers, which is applied in the field of nanomaterials, can solve problems such as the application constraints of fluorescence lifetime, and achieve the effects of large application potential, mild reaction conditions, and simple steps

Inactive Publication Date: 2018-05-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Quantum dots usually contain some toxic substances such as heavy metals such as cadmium and lead, and organic fluorescent materials are restricted in application due to the limitation of their fluorescence lifetime.

Method used

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  • Preparation method of golden nanoclusters emitting red fluorescence
  • Preparation method of golden nanoclusters emitting red fluorescence
  • Preparation method of golden nanoclusters emitting red fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of red fluorescent gold nanoclusters:

[0026] (1) Add 0.5mL, 10mM chloroauric acid solution to 0.5mL, 15g / L keratin solution, mix well;

[0027] (2) in above-mentioned solution, add NaOH solution to adjust pH to 12, obtain pale yellow solution;

[0028] (3) After incubating the above solution at 37°C for 12h, a brown gold nanocluster solution was obtained;

[0029] (4) The gold nanocluster solution was poured into a dialysis bag with a molecular weight cut-off of 3500 Da, dialyzed for 24 hours, and then freeze-dried to obtain gold nanocluster particles.

[0030] The excitation wavelength of the gold nano-cluster particles obtained by the above method is 520 nm, and the emission wavelength is 680 nm.

Embodiment 2

[0032] A preparation method of red fluorescent gold nanoclusters:

[0033] (1) Add 0.5mL, 10mM chloroauric acid solution to 0.5mL, 20g / L keratin solution, mix well;

[0034] (2) in above-mentioned solution, add NaOH solution to adjust pH to 12, obtain pale yellow solution;

[0035] (3) After incubating the above solution at 37°C for 12h, a brown gold nanocluster solution was obtained;

[0036] (4) The gold nanocluster solution was poured into a dialysis bag with a molecular weight cut-off of 3500 Da, dialyzed for 24 hours, and then freeze-dried to obtain gold nanocluster particles.

[0037] The excitation wavelength of the gold nano-cluster particles obtained by the above method is 520 nm, and the emission wavelength is 680 nm.

Embodiment 3

[0039] A preparation method of red fluorescent gold nanoclusters:

[0040] (1) Add 0.5mL, 10mM chloroauric acid solution to 0.5mL, 25g / L keratin solution, mix well;

[0041] (2) in above-mentioned solution, add NaOH solution to adjust pH to 12, obtain pale yellow solution;

[0042] (3) After incubating the above solution at 37°C for 12h, a brown gold nanocluster solution was obtained;

[0043] (4) The gold nanocluster solution was poured into a dialysis bag with a molecular weight cut-off of 3500 Da, dialyzed for 24 hours, and then freeze-dried to obtain gold nanocluster particles.

[0044] The excitation wavelength of the gold nano-cluster particles obtained by the above method is 520 nm, and the emission wavelength is 680 nm.

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Abstract

The invention discloses a preparation method of golden nanoclusters emitting red fluorescence. The method is characterized by comprising the following steps: separately preparing a chloroauric acid solution and a keratin solution, slowly adding the chloroauric acid solution into the keratin solution, and then fully stirring the mixture to uniformly mixing the solutions to obtain a faint yellow solution; regulating the pH value of the solution to 8-12; placing the solution at 25-60 DEG C to incubate to obtain a brown golden nanocluster solution; and pouring the golden nanocluster solution intoa dialysis bag to be dialyzed, wherein the molecular weight cut-off is 3500Da, and then freezing and drying the mixture to obtain the golden nanocluster particles. By taking keratin as a stabilizer and a reducer and tetrachloroauric acid as a precursor to synthesize fluorescent golden clusters, the prepared golden nanoclusters emit red fluorescence, the maximum excitation wavelength is 520nm and the maximum emitting wavelength is 670nm. The keratin has rich sulfydryl, is good in stability, and meanwhile, has an effective reducing capacity.

Description

technical field [0001] The invention relates to a preparation method of red fluorescent gold nano-clusters, and belongs to the technical field of nanomaterials. Background technique [0002] Gold nanoclusters are usually composed of several to hundreds of gold atoms, and their size is about 1 nanometer, so they are substances between gold atoms and gold nanoparticles. Due to the influence of size, gold clusters exhibit some special properties, such as surface effect, quantum size effect, volume effect and macroscopic quantum tunneling effect, which are characteristic of nanomaterials. At the same time, gold clusters also have fluorescent properties that general gold nanoparticles do not have, and compared with quantum dots and other organic fluorescent materials, gold nanoclusters also have unique advantages in terms of physical and chemical properties. Quantum dots usually contain some heavy metals cadmium, lead and other toxic substances, and organic fluorescent materials...

Claims

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Application Information

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IPC IPC(8): B22F9/24C09K11/58B82Y40/00
CPCB22F9/24B82Y40/00C09K11/58
Inventor 杨光曹禺李炎
Owner DONGHUA UNIV
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