Preparation method and application of gold nanocluster with adjustable fluorescence and size

A gold nanocluster, size technology, applied in the field of catalysis, can solve the problems of unfavorable fluorescent gold nanoclusters application field, loss of photoluminescence, non-tunable fluorescence emission of gold clusters, etc.

Inactive Publication Date: 2016-06-22
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because clusters with extremely small sizes have a strong tendency to aggregate, they are very easy to agglomerate into larger particles and lose their photoluminescent properties. Therefore, the commonly used wet chemical reduction of chloroauric acid to prepare gold clusters is very easy to form. Luminous gold nanoparticles
[0004] In addition, the existing gold nanocluster preparation methods at this stage still have the following problems: (1) the preparation method is relatively complicated, requiring additional reducing agents or heterogeneous reaction environments, and the purification of reaction products is difficult; (2) the generated gold nanoclusters The clusters are excited by ultraviolet light, which is not conducive to their biological applications; (3) The fluorescence emission of the prepared gold clusters is mostly not adjustable, and only nanoclusters with a relatively single size and single fluorescence emission can be generated
This is also not conducive to expanding the application field of fluorescent gold nanoclusters.

Method used

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  • Preparation method and application of gold nanocluster with adjustable fluorescence and size
  • Preparation method and application of gold nanocluster with adjustable fluorescence and size
  • Preparation method and application of gold nanocluster with adjustable fluorescence and size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Mix 2-mercaptopropyltrimethoxysilane with a mass concentration of 95%, 0.05mol / L ethanol solution of chloroauric acid and absolute ethanol at a volume ratio of 50:1:0 to obtain a colorless solution;

[0020] b. Place the solution obtained in step a under the irradiation of a 300W high-pressure mercury lamp, wherein the mercury lamp is equipped with a 365nm filter, and the optical density is adjusted to 0.018W cm -2 , after being irradiated by a high-pressure mercury lamp for 6 hours, a homogeneously dispersed pale yellow gold nanocluster sol was obtained.

[0021] The fluorescence emission peak of the obtained gold sol is located at 538nm, the maximum excitation wavelength is 460nm, and the particle size is about 1.3nm.

Embodiment 2

[0023] a. Mix 2-mercaptopropyltrimethoxysilane with a mass concentration of 95%, 0.05mol / L ethanol solution of chloroauric acid and absolute ethanol at a volume ratio of 50:1:0 to obtain a colorless solution;

[0024] b. Place the solution obtained in step a under the irradiation of a 300W high-pressure mercury lamp, wherein the mercury lamp is equipped with a 365nm filter, and the optical density is adjusted to 0.018W cm -2 , after being irradiated by a high-pressure mercury lamp for 8 hours, a homogeneously distributed pale yellow gold nanocluster sol was obtained.

[0025] The fluorescence emission peak of the obtained gold sol is located at 538nm, the maximum excitation wavelength is 460nm, and the particle size is about 1.3nm.

Embodiment 3

[0027] a. Mix 2-mercaptopropyltrimethoxysilane with a mass concentration of 95%, 0.05mol / L chloroauric acid ethanol solution and absolute ethanol in a volume ratio of 50:1:0 to obtain a colorless solution;

[0028] b. Place the solution obtained in step a under the irradiation of a 300W high-pressure mercury lamp, wherein the mercury lamp is equipped with a 365nm filter, and the optical density is adjusted to 0.018W cm -2 , after 10 hours of high-pressure mercury lamp irradiation, a homogeneously dispersed pale yellow gold nanocluster sol was obtained.

[0029] The fluorescence emission peak of the obtained gold sol is located at 538nm, the maximum excitation wavelength is 460nm, and the particle size is about 1.3nm.

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Abstract

The invention relates to a preparation method and an application of a gold nanocluster with adjustable fluorescence and size. The method adopts mercaptosilane commonly used in the industry as a stabilizer and a reductant, and prepares the gold nanocluster in a way of chloroauric acid photochemical reduction. The method is quick, effective and simple in preparation program, no extra reductant is added, and no reaction produces in a multi-phase environment. The gold nanocluster prepared with the method can be uniformly dispersed in an organic solvent and water, and has excellent photoluminescent performance. The maximum excitation wavelength of the fluorescence of the gold nanocluster is positioned in a visible light region (400-460nm) and the position of an emission peak can be adjusted and controlled in a range of 530-580nm. The gold nanocluster has the characteristics of visible light excitation, large Stokes shift and adjustable fluorescence-emission color and size, thereby having potential application prospects in the fields of fluorescence imaging, marking and catalysis.

Description

technical field [0001] The present invention relates to a preparation method and application of gold nanoclusters with adjustable fluorescence and size. The gold cluster materials obtained by this method have adjustable size and photoluminescent properties, and can be applied to fluorescence-related fields, such as Light-emitting devices, fluorescent sensors, and biomarkers can also be used in catalysis and other fields. Background technique [0002] A metal cluster is a material consisting of a few to hundreds of atoms, with properties between molecules and nanoparticles. The quantum confinement effect produced by the extremely small size makes the electronic energy levels of metal clusters change from quasi-continuous to discrete, resulting in some special properties, such as photoluminescence. As a new type of fluorophore emerging in recent years, luminescent metal clusters are increasingly used in applications such as biology, fluorescence sensing, and optical devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C09K11/58B82Y40/00
CPCC09K11/58B82Y40/00B22F9/24B22F1/0545
Inventor 王传义周劭臣王富
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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