CN-121975502-A - Method for preparing nano silver and graphene composite material by flashing and application

Abstract

The invention provides a method for preparing a nano silver and graphene composite material by flashing, which comprises the steps of adding silver salt or silver oxide into deionized water under normal temperature, stirring, adding graphene, performing ultrasonic oscillation water bath treatment to obtain a mixed solution, performing vacuum drying to obtain the composite material, and performing flashing treatment to obtain the nano silver and graphene composite material. The application of the nano silver and graphene composite material is also provided, and the nano silver and graphene composite material is used for preparing a heat conduction material. The nano silver and graphene composite material prepared by adopting the flash treatment has the advantages of good dispersibility, high purity, simple preparation method, wide raw material sources, low cost, easy realization of experimental equipment and conditions and good repeatability.

Inventors

• ZHANG WENYAN
• MA LINYUAN
• LI JIA
• WU PENG
• GAO XINYU
• LIANG ZELIN

Assignees

• 西北大学

Dates

Publication Date

20260505

Application Date

20260128

Claims (7)

1. 1. The method for preparing the nano silver and graphene composite material by flashing is characterized by comprising the following steps: S1, adding silver salt into deionized water under normal temperature, stirring, adding graphene, and performing ultrasonic oscillation water bath treatment to obtain a mixed solution; or under the normal temperature condition, adding silver oxide into deionized water, adding concentrated ammonia water, stirring, adding graphene, and performing ultrasonic oscillation water bath treatment to obtain a mixed solution; s2, vacuum drying the mixed solution obtained in the step S1 to obtain a composite material; And S3, performing flash treatment on the composite material obtained in the step S2 to obtain the nano silver and graphene composite material.
2. 2. The method for preparing the nano silver and graphene composite material by flashing according to claim 1, wherein the mass ratio of the silver salt or the silver oxide to the graphene in S1 is (1-10): 1.
3. 3. The method for preparing the nano silver and graphene composite material by flashing according to claim 1 is characterized in that the condition of ultrasonic oscillation in S1 is 50-100W, 0.5-1.5 h.
4. 4. The method for preparing the nano-silver and graphene composite material by flashing according to claim 1, wherein the vacuum drying condition in S2 is 50 ℃ for 24 hours.
5. 5. The method for preparing the nano silver and graphene composite material by flashing according to claim 1 is characterized in that the condition of the flashing treatment in the step S3 is that the flashing voltage is 180 mV-380 mV, the flashing time is 90 ms-200 ms, a white light source and a xenon lamp pulse.
6. 6. The method for preparing the nano silver and graphene composite material by flashing according to claim 1, wherein the particle size of silver powder in the nano silver and graphene composite material in the step S3 is 10 nm-200 nm.
7. 7. Use of the nano-silver and graphene composite material prepared by the method according to any one of claims 1-6, wherein the nano-silver and graphene composite material is used for preparing a heat conducting material.

Description

Method for preparing nano silver and graphene composite material by flashing and application Technical Field The invention belongs to the technical field of nano material synthesis, and particularly relates to a method for preparing a nano silver and graphene composite material by flashing and application thereof. Background The electronic devices rapidly develop to microminiaturization, high power and integration, the heat density of scenes such as 5G base station chips, new energy automobile power batteries, aerospace electronic equipment and the like is rapidly increased, and the traditional heat conducting materials are difficult to adapt. The density of pure metal (copper and aluminum) is high, corrosion is easy, electromagnetic shielding interference signals are easy, the heat conductivity coefficient of organic filler (boron nitride and aluminum oxide) is low, the high-end heat dissipation requirement cannot be met, and novel materials with high heat conductivity, light weight, stability and easy processing characteristics are needed. Disclosure of Invention The invention aims to solve the technical problems of the prior art, and provides a method for preparing a nano silver and graphene composite material by flashing and application of the method. In order to solve the technical problems, the technical scheme adopted by the invention is that the method for preparing the nano silver and graphene composite material by flashing comprises the following steps: S1, adding silver salt into deionized water under normal temperature, stirring, adding graphene, and performing ultrasonic oscillation water bath treatment to obtain a mixed solution; Or under the normal temperature condition, adding silver oxide into deionized water, adding ammonia water, stirring, adding graphene, and performing ultrasonic oscillation water bath treatment to obtain a mixed solution; s2, vacuum drying the mixed solution obtained in the step S1 to obtain a composite material; And S3, performing flash treatment on the composite material obtained in the step S2 to obtain the nano silver and graphene composite material. According to the invention, a flash precise mode is adopted to realize 'selective area modification', nano silver grows in situ in the graphene 3D network, and the problems of residue and non-uniformity of a wet chemical method are avoided. Preferably, the mass ratio of the silver salt or silver oxide to the graphene in the S1 is (1-10): 1. Preferably, the ammonia water in S1 is 24% ammonia water by mass. Preferably, the condition of ultrasonic oscillation in the S1 is 50-100W, 0.5-1.5 h. Preferably, the conditions for vacuum drying in S2 are 50℃for 24 hours. Preferably, the condition of the flash processing in the step S3 is that the flash voltage is 180 mV-380 mV, the flash time is 90 ms-200 ms, the white light source and the xenon lamp pulse. Preferably, the particle size of the silver powder in the nano silver and graphene composite material in the S3 is 10 nm-200 nm. The invention also provides application of the nano silver and graphene composite material prepared by the method, and the nano silver and graphene composite material is used for preparing a heat conduction material. Compared with the prior art, the invention has the following advantages: The nano silver and graphene composite material prepared by adopting the flash treatment has the advantages of good dispersibility, high purity, simple preparation method, wide raw material sources, low cost, easy realization of experimental equipment and conditions and good repeatability. The invention is described in further detail below with reference to the drawings and examples. Drawings Fig. 1 is an SEM image (a), an XRD image (b) and a thermal imaging image (c) of the nano-silver and graphene composite material prepared in example 1 of the present invention. Fig. 2 is an SEM image of the nano-silver and graphene composite material prepared in example 2 of the present invention. Fig. 3 is an SEM image of the nano-silver and graphene composite material prepared in example 3 of the present invention. Fig. 4 is an SEM image of the nano-silver and graphene composite material prepared in comparative example 1 of the present invention. Detailed Description The instrument information used in the embodiment of the invention is as follows: The electronic balance was an electronic balance of model ME104E manufactured by Metrele-Tolyduo instruments, inc., the magnetic heating stirrer was a magnetic heating stirrer of model IKA RCT basic manufactured by Ai Ka (Guangzhou) instruments, inc., the ultrasonic cleaner was an ultrasonic cleaner of model KQ5200 manufactured by Kunshan ultrasonic instruments, inc., the scanning electron microscope was a scanning electron microscope of model SU8010 manufactured by HITACHI, and the elemental composition of the sample was analyzed by X-ray diffractometer (XRD). The information of the reagents used in the invention is as follows: Silve