Properties and Applications of Graphene

Graphene has very good optical properties, the absorption rate is about 2.3% in a wide wavelength range, and it looks almost transparent. In the range of several layers of graphene thickness, the absorption rate increases by 2.3% for each additional layer of thickness, Large-area graphene films also have excellent optical properties, and their optical properties vary with the thickness of graphene. This is the unusual low-energy electronic structure of single-layer graphene. When a voltage is applied to a double-gate double-layer graphene field-effect transistor at room temperature, the band gap of graphene can be adjusted between 0 and 0.25eV. When a magnetic field is applied, graphene The optical response of the nanoribbons can be tuned to the terahertz range.

When the intensity of the incident light exceeds a certain critical value, the absorption of graphene will reach saturation. These properties allow graphene to be used as a passively mode-locked laser. This unique absorption may become saturated when the input light intensity exceeds the A threshold, which is called the saturation effect, graphene can saturate easily under strong excitation in the near-infrared region, due to the ring-shaped optical absorption and zero bandgap. Due to this special property, graphene has a wide range of applications in ultrafast photonics. The optical response of the graphene/graphene oxide layer can be tuned electrically. Under denser laser illumination, graphene may possess a nonlinear phase-shift optical nonlinearity Linear Kerr effect.

Graphene is one of the strongest known materials, and also has good toughness and can be bent. The theoretical Young’s modulus of graphene is 1.0TPa, and the inherent tensile strength is 130GPa. It is modified by hydrogen plasma. The reduced graphene also has very good strength, and the average modulus can be as large as 0.25TPa. The graphite paper composed of graphene flakes has many pores, so the graphite paper is very brittle. However, functionalized graphene is obtained by oxidation. Graphite paper made of functionalized graphene is exceptionally strong and strong.

Applications of Graphene

The properties of graphene is so prominent that can be used in many fields.

Graphene makes people indoors feel as if they are in a windless “warm sun in winter”, which can provide both heating and health care. Different from traditional heating equipment such as air conditioners, oil heaters, and floor heating, graphene heating paintings are more comfortable, more energy-saving, not boring, and non-toxic. Noise, neither lack of oxygen nor light pollution, and other characteristics is a classic innovation of technology to change a life.

In addition to covering the body and keeping warm, traditional clothing only has value. There are few products with high technology content. Through technical seminars, Yijiazhiene is aimed at extremely cold regions, outdoor people in winter and spring, people with a deficient constitution, and people who love beauty in winter. In the application field of graphene electric heating film, we have independently developed high-tech intelligent heating clothing, and made graphene composite film into a flexible heating core with high efficiency and heat conduction, which is perfectly combined with daily clothing.

The application of graphene electric heating film brings revolutionary changes to traditional clothing. The heating speed is extremely fast, and it can reach 40 degrees Celsius and above in a few seconds, and the controllable constant temperature under low voltage (5V) continues for 3 to 5 hours. With intelligent temperature control, the wearer can adjust the inner core of the garment to a comfortable temperature.

In all, the conductive function and ultra-high light transmission function of graphene make it suitable for transparent electrodes, solar cell electrodes, liquid crystal display, and other fields. Now, ITO and FTO (fluorine-doped tin oxide) are used in liquid crystal display and solar cell electrodes. Such materials have good electrical conductivity and are transparent to light, making them good electrode materials.