High-value graphene preparation

At present, there are four main preparation methods of graphene materials: micromechanical exfoliation method, epitaxial growth method, graphite oxide reduction method and vapor deposition method. In recent years, a variety of preparation methods of graphene have been continuously improved and improved, and efforts have been made to prepare high-quality graphene with controllable number of layers, large area, high quality and low cost in batches. The preparation method of it is more optimized to reduce the preparation process and the material cost of preparation.

Basic properties of graphene

(1) Good physical and electrical properties, such as high specific surface area, high conductivity, high mechanical strength, easy modification and large-scale production. It is a zero-bandgap semiconductor with unique carrier characteristics, which provides an important way for the study of relativistic mechanical phenomena. The resistance of electrons transported in graphene is very small, which has good electron transport properties.

(2) Good toughness, Franli experiment found that it is one of the materials with the best mechanical properties found so far. The unique band structure of graphene separates holes and electrons, resulting in the emergence of new electron conduction phenomena, such as quantum interference effect and irregular quantum Hall effect. It has properties that surpass existing materials in many ways.

Properties of graphene

(1) Electrical properties: It is a zero-bandgap semi-metallic material, considering the interaction between quasiparticles, the speed  carriers has nothing to do with the quantization energy.The electrons in it by two-dimensional films, and the anomalous quantum Hall effect can be observed.

(2) Thermal properties: It has strong carbon atom bonding force and small loss of thermal energy during transmission, so it has high thermal conductivity. It prepared by different methods interacts differently with the support interface.

(3) Optical properties: The reflectivity is very small, only single atom thick, and its absorbance can reach 2.3%. With each additional layer of graphene, the light transmittance of the film is reduced by 2.3% and is not affected by the wavelength of the incident light. Since photons are neutral, the light field is difficult to control, but regulating the carrier concentration in it can regulate the light field.

(4) Mechanical properties: The mechanical properties  obtained by measuring the suspended graphene on the nanopores with a nanoindenter instrument. And the friction  changes with the angle of the external force, which is anisotropic, which means that it has achieved superlubrication.

Graphene preparation method

(1)Redox method: a single layer of graphene oxide is formed by peeling off graphite oxide. Graphite oxide is graphite peeled off under the action of strong oxidants such as H2SO4, HNO3, HClO4, or electrochemical peroxidation to form a single layer of graphene oxide. After the preparation of graphene oxide, the prepared it oxide is deoxidized and re-graphitized by chemical reduction, which can restore part of its conductivity while maintaining its geometry.

(2)Epitaxial growth method: It can achieve large-size, high-quality graphene preparation, which is a very important preparation method to realize the practical application of graphene devices, but the thickness of graphene is determined by heating temperature, and it is difficult to prepare samples of a single thickness over a large area.

(3)Chemical vapor deposition: provides an effective way to achieve large-scale, reproducible material preparation of high-quality graphene with structured structure and controllable thickness and size. At present, copper foil is one of the most commonly used substrate materials for growing single-layer graphene films.

At present, the Franli factory uses excellent preparation methods to realize the controllable preparation of graphene, and obtain graphene with high purity and good crystallinity, which is an important basis for the construction of graphene products. It can be seen that the high-quality graphene of this factory has been applied in many fields, the performance is good, if you need to contact us, we will provide affordable prices.