Thermal conductive graphite sheet

Introduction to the

Graphite heat sink (3K-SBP), is a new heat conduction material, has a unique grain orientation, uniform heat conduction in two directions, lamellar structure can be well adapted to any surface, shielding heat source and components at the same time to improve the performance of consumer electronics products. The product also provides thermal isolation in terms of thickness while evenly dissipating heat. The molecular structure of the thermal conductive graphite sheet is as follows:
Graphite thermal solutions The unique combination of heat dissipation and insulation properties makes thermal graphite an outstanding material choice for thermal management solutions. The thermal conductive graphite sheet has a high thermal conductivity in the range of 150-1500 W/m-K in the plane.
Thermal Flexible Graphite sheet is a kind of natural element mineral with single carbon (C) element as its chemical composition. Thin film Polymer compounds can be chemically made into graphitized films under high temperature and pressure, Because carbon is a non-metallic element, but there are conductive metal materials, heat conduction performance, but also has like organic plastic plasticity, and there is special thermal properties, chemical stability, lubrication and can be coated on the surface of the solid, and so on some good process performance, therefore, the thermal conductivity of graphite in the electronics, communications, lighting, aviation and national defense war industry etc many fields widely The application of.
Graphite thermal conductive materials provide a unique and integrated high performance solution for the thermal management industry. Thermal graphite materials through a series of different thermal management solutions to the increasingly wide demand for industrial cooling field to bring new technology solutions Hot graphite materials products provide electronic industry thermal management of innovative new technology. Thermal graphite is a novel application of thermal design by providing superior thermal performance while reducing device weight. Thermal conductive graphite can effectively solve the thermal design problems of electronic equipment.

Ultra-thin graphite sheet of tape film:
Graphite film has a unique high crystallization and crystal lattice orientation, carbon atoms into layered structure, within its layer of carbon atoms arranged in hexagonal, each are connected to the interval between adjacent carbon carbon, each layer of the carbon in the six-party rings, each cell 4 C atoms, each of the outermost 3 C atom electronic, graphite layers by van der Waals force, Interlayer C-C atom spacing =0.142nm, interlayer C-C atom spacing =0.335nm. Graphite film this material has a very high thermal conductivity, thermal conductivity along the direction of the film can reach 1900W/m.k, along the vertical direction can be 17W/m.k. Its products are applicable to a wide range of fields, in the field of thermal materials is a revolutionary technical application breakthrough.

Thermal conductivity graphite sheet characteristics
Features: the surface can be combined with metal, plastic, adhesive and other materials to meet more design functions and needs.
Low thermal resistance: 40% lower than aluminum and 20% lower than copper.
Light weight: 25% lighter than aluminum, 75% lighter than copper.
High thermal conductivity: the graphite radiator can be smoothly attached to any flat and curved surface, and can be cut in any form according to customer requirements.

Advantages
Graphite film is easy to process and easy to install.
Artificial graphite film with its high thermal conductivity, high reliability, thin, easy processing, environmental protection and other excellent characteristics are widely used in new energy, energy saving transformation and other important emerging industries, such as photovoltaic inverter, wind converters, frequency converters, and in the field of power electronics technology such as LED has a huge application prospect. Of course, this type of product is most widely used in smart phones, such as Apple mobile phone, Samsung mobile phone. At the same time in the notebook, handheld devices, communication base station equipment has been used in business.

Synthetic
Problems with the use of traditional silica gel:
A. Silicone oil separation and pollution of surrounding devices;
B. Production of siloxane leads to poor contact of electronic devices.
Advantages of using graphite film:
A. Reliability improvement;
B, does not occur siloxane, does not pollute surrounding devices, environmental protection.
(1) Using natural flake graphite as raw material, graphite oxide was prepared by Hummers method, and then peeled into graphene by thermal stripping, or peeled into graphene oxide by ultrasonic dispersion, and then reduced into graphene by chemical reduction. The morphology, structure and other properties of graphene were investigated by SEM, TEM, HRTEM, XRD and Raman system.
(2) Using graphene as matrix and tetra-butyl titanate as titanium source, TiO2 / graphene nanocomposite was firstly prepared by sol-hydrothermal method. The crystal structure, particle morphology and chemical composition of TiO2 / graphene nanocomposites were characterized by XRD, SEM, TEM and Raman. The results showed that the synthesized TiO2 nanocrystals had anatase structure and good crystallization condition, and the composite effect of TiO2 and graphene was good. The photocatalytic performance of nanocrystals was studied, and the results show that the catalytic performance of titanium dioxide/graphene is high.
(3) Zinc oxide/graphene nanocomposites were prepared by sol method with GO as the matrix and zinc acetate as the zinc source. The results show that the synthesized ZnO nanocrystals have a hexagonal wurtzite structure and a single crystal structure, and the composite effect of ZnO and graphene is ideal. The results show that graphene/zinc oxide has a high catalytic efficiency. The fluorescence effect of the composite material is measured, and the mechanism of improving the catalytic efficiency of graphene/zinc oxide is discussed.
(4) Cadmium sulfide/graphene nanocomposites were prepared by sol method with GO as the matrix, Cadmium acetate as the cadmium source and Thiourea as the sulfur source. The results show that the synthesized CdS nanocrystalline structure and the composite effect of CdS and graphene is very good. The photocatalytic performance of the composite was studied. The results show that the composite has high catalytic efficiency.

The research content
The specific research content includes the following three parts:
1. Using REDOX method to synthesize graphene, prepare graphene modified electrode to detect the four bases of DNA. Electrochemical study found that graphene modified glassy carbon electrode can realize the simultaneous detection of the four bases of DNA. The graphene was composite with carbon nanotubes and β-cyclodextrin, and the carbon nanotubes effectively reduced the aggregation of graphene. The electrochemical performance of the graphene/carbon nanotubes / β-cyclodextrin modified electrode was studied. The modified electrode can be used for the highly sensitive detection of guanine nucleoside.
2. The biocompatible SSDNA-graphene composites prepared by functionalization assembly of biomacromolecule single stranded DNAs (ssDNA) and graphene can be preserved in aqueous solution for a long time without deposition, which improves the stability of graphene in aqueous solution. SSDNA-graphene composites are excellent materials for immobilization of oxidoreductase due to their large specific surface area and good biocompatibility. The glucose oxidase was immobilized by SSDNA-graphene composite to prepare the glucose sensor. The glucose oxidase achieved direct electrochemistry and maintained biological activity. The electron transfer rate was 4.14s-1, which showed good anti-interference and stability for the detection of glucose.
3. Using in situ synthesis method to prepare graphene-Fe3O4 nanocomposites, Fe3O4 increased the dispersion and stability of graphene in water, respectively with magnets and magnetometer tests show that graphene-Fe3O4 nanocomposites have magnetic properties. Preparation of graphene-Fe3O4 modified electrode. Electrochemical study showed that graphene-Fe3O4 composite material has catalytic effect on hydrogen peroxide, the minimum detection limit is 5.4μmol·L-1, and has anti-interference against ascorbic acid and uric acid. Graphene-Fe3O4 nanocomposites have potential applications in the field of electrochemistry.

Application
Widely used in PDP, LCD TV, Notebook PC, UMPC, Flat Panel Display, MPU, Projector, Power Supply, LED and other electronic products graphite cooling materials. Graphite cooling materials have been widely used in communication industry, medical equipment, Sony/Dell /Samsung notebooks, ZTE mobile phones, Samsung PDP, PC memory chips, LED substrate and other cooling.
LED, heat sink, LD-TV, notebook computer, communication equipment, wireless switch, DVD, handheld device, video camera/digital camera, mobile phone.