Micron gold cage shell structure material with broadband absorption characteristic and preparation method of micron gold cage shell structure material

Abstract

The invention belongs to the field of core-shell composite structure materials, and particularly relates to a micron gold cage shell structure material with a broadband absorption characteristic and apreparation method of the micron gold cage shell structure material. A monodisperse nanogold concentrated solution with a certain concentration is mixed with a PS@Au microsphere emulsion subjected tosurface modification, and nanogold particles are self-mounted on the surfaces of modified PS@Au microspheres through electrostatic interaction. According to the material and the preparation method, the surfaces of the PS@Au microspheres are coated with the foamed nanogold particles by virtue of a self-assembly technology, and finally, polystyrene microspheres in the centers are removed, so that anovel gold cage shell composite material with a core-shell structure is obtained. By means of the special structure, Plasma resonance absorption formed by the nanogold core shells prepared through aFrens surface growing method is achieved; MNPAu uniformly grows on the surface to form a photonic crystal resonance peak; and due to the strong coupling effect of the two peaks, the absorption of themicron gold cage shell structure material in an ultraviolet-infrared wave band is expanded into 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...

Examples

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.

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...

Examples

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.

Images