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A kind of micron gold cage shell structure material with broadband absorption characteristics and its preparation

A technology of absorption characteristics and shell structure, which is applied in the field of micron gold cage shell structure materials and its preparation, can solve problems such as inability to achieve broadband absorption, and achieve the effects of improved distribution form, uniform particle size, and large specific surface area

Inactive Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Achieving broadband absorption of gold nanoparticles is of great significance to expand the application range of gold nanoparticles. The broadband absorbing nano-gold materials can be applied to the detection of broadband sensing. However, no matter what kind of existing gold nano-core-shell structure, its Only has a single peak structure and cannot achieve broadband absorption

Method used

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  • A kind of micron gold cage shell structure material with broadband absorption characteristics and its preparation
  • A kind of micron gold cage shell structure material with broadband absorption characteristics and its preparation
  • A kind of micron gold cage shell structure material with broadband absorption characteristics and its preparation

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preparation example Construction

[0038] A kind of preparation method of the micron gold cage shell structure material with broadband absorption characteristic provided by the present invention comprises the following steps:

[0039](1) Obtain the emulsion of polystyrene microspheres with a gold shell on the surface, which is denoted as PS@Au microsphere emulsion; the emulsion contains PS@Au microspheres with a core-shell structure, which is based on polystyrene microspheres Core, with the dense gold film on the surface of the polystyrene microsphere as the shell;

[0040] (2) Modify the PS@Au microsphere emulsion so that its surface is charged, and obtain the modified PS@Au microsphere emulsion;

[0041] (3) Mix the nano-gold concentrate with the modified PS@Au microsphere emulsion, so that the nano-gold particles are attached to the surface of the PS@Au microspheres through electrostatic interaction, and obtain monodisperse gold nanoparticles-coated PS @Au microspheres; the microspheres use PS@Au microspher...

Embodiment 1

[0069] figure 1 It is a flow chart of the method for coating PS@Au with nano-gold particle foam of the present invention, which specifically includes the following steps:

[0070] Step 1. Preparation of nano-gold particle concentrate

[0071] (1) Add 1mL of tetrachloroauric acid solution with a mass fraction of 1% and 79mL of ultrapure water in the ground-mouth Erlenmeyer flask A, and stir in a water bath magnetic stirrer (temperature is 60° C.);

[0072] (2) Add 4 mL of 1% sodium citrate solution and 200 μL of 0.1 moL / L potassium carbonate solution into Erlenmeyer flask B. Then add 700 μL of tannic acid solution with a mass fraction of 1% and 15.1 mL of ultrapure water mixed solution, put it in a constant temperature magnetic stirring water bath (temperature is 65° C.) and preheat and stir for 5 minutes;

[0073] (3) Quickly add the solution of Erlenmeyer flask B into Erlenmeyer flask A, and then stir at constant temperature in a water-bath magnetic stirrer for 30 minutes t...

Embodiment 2- Embodiment 6

[0103] Other conditions are the same as in Example 1, and the parameter tables in the preparation of PS@Au emulsion involved in Examples 2 to 6 and the preparation process of nano-gold concentrate are shown in Table 1 and Table 2, and the parameter ranges in Table 1 and Table 2 are adopted. Nano-gold particles coated PS@Au composite materials can obtain PS@Au coated with nano-gold particles foam.

[0104] Table 1: Parameter table of polystyrene microsphere emulsion

[0105]

[0106]

[0107] Table 2: Parameter table of gold nanoparticles with different particle sizes (each parameter of embodiment 4 to embodiment 6 is the same as embodiment 1)

[0108]

[0109] figure 2 The transmission electron microscope image of the micron gold cage shell prepared for Example 1 of the present invention shows the nano-gold shell layer on the surface and the monodisperse gold nano-particles attached thereto.

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Abstract

The invention belongs to the field of core-shell composite structural materials, and more specifically relates to a micron gold cage shell structural material with broadband absorption characteristics and its preparation. A certain concentration of monodispersed gold nanoparticle concentrate was mixed with the surface-modified PS@Au microsphere emulsion, and the gold nanoparticles self-assembled on the surface of the modified PS@Au microsphere through electrostatic interaction. The present invention realizes the coating of foamy gold nanoparticles on the surface of PS@Au microspheres through self-assembly technology, and finally obtains a new core-shell structure gold cage-shell composite material by removing the polystyrene microspheres in the center. This special structure makes it not only have the Plasma resonance absorption formed by the nano-gold core-shell grown on the surface of Frens; but also the uniform growth of MNPAu on the surface forms a photonic crystal resonance peak; the strong coupling of the two peaks leads to its UV‑ Absorption in the infrared band extends to broadband absorption.

Description

technical field [0001] The invention belongs to the field of core-shell composite structural materials, and more specifically relates to a micron gold cage shell structural material with broadband absorption characteristics and its preparation. Background technique [0002] The core-shell composite structure is a kind of composite crystal, amorphous or polycrystalline phase structure formed by using spherical particles with a size of submicron as the core, and covering nano-sized particles with physical and chemical methods on the surface. The metal-insulator core-shell composite structure material has the composite characteristics of metal nanoparticles and insulating core. By adjusting parameters such as particle size and thickness, its mechanical, thermal and photoelectric properties can be manipulated. With the development of science and technology, the design and synthesis of monodisperse, smart and controllable core-shell composite structure materials is one of the ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F1/02B82Y40/00
CPCB82Y40/00B22F1/0549B22F1/14B22F1/054B22F1/17
Inventor 董烁易林成乐笑黎诗剑常槟榔
Owner HUAZHONG UNIV OF SCI & TECH
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