Membrane Switch and Graphene

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Since graphene was discovered by two scientists at the University of Manchester, the United Kingdom in 2004, it has quickly attracted the attention of the world due to its high strength, good toughness, and light weight. In 2010, two scientists were awarded the Nobel Prize in Physics for the discovery. In the past ten years, the research on graphene has been very hot. Graphene is also regarded as a "revolutionary material" because of its extremely broad application prospects in the fields of energy, biotechnology, aerospace and aviation. Some experts predict that the global graphene industry will exceed US$100 billion in the next 5 to 10 years.

 

According to related research reports, Graphene is a honeycomb-like quasi-two-dimensional structure formed by hybridization of C atoms with sp2 electron orbitals, and is another allotrope of C. Compared with other new materials, graphene has many excellent characteristics, such as high carrier mobility, high current density, high strength, high thermal conductivity, ultra-thin, ultra-light and ultra-hard, as well as high-performance sensors and enhanced electronics. Transport, catalyst, hydrogen absorption, bipolar semiconductor, non-radiation transmission and other functions. Due to its excellent performance and numerous functions, graphene is widely used in lithium electronic batteries, super capacitors, conductive inks, touch screens, flexible electronics, heat dissipation, coatings, sensors and other fields. In addition, Graphene can also be found in fields such as chemicals, seawater desalination, solar cells, fuel cells, catalysts, and building materials. Some experts predict that in the next few years, graphene will be mainly used in five fields: "conductive ink", "anti-corrosion coating", "heat dissipation material", "lithium battery" and "super capacitor".

 

Field 1: Conductive ink

 

Conductive inks are inks made of conductive materials that have a certain degree of conductivity and can be used for printing conductive dots or conductive lines. In recent years, it has been widely used in industries such as mobile phones, toys, membrane switches, solar cells, far-infrared heating films, and radio frequency identification technology. In the past few decades, the largest downstream of conductive ink has been solar cells and display devices. In the future, applications including touch sensors and their electrodes, RFID and electronic paper will also maintain growth.

 

Graphene conductive ink has strong advantages and promising development prospects. Conductive ink is a filled composite material, which has conductive properties after printing and sintering. Graphene ink has two main advantages: First, it has strong compatibility. Graphene ink can be printed on a variety of substrates such as plastic film, paper, and metal foil. The second is that it is cost-effective and comparable to existing nano metal conductive ink, graphene ink has a greater cost advantage.

 

Due to the good performance of graphene, the ink made from it has the characteristics of low resistance, strong conductivity and high optical transparency. It is used in various conductive circuits and sensors, radio frequency identification systems, smart packaging, medical monitors and other electronic products. widely used. In 2015, the output of conductive inks has reached 800,000 tons. It is estimated that the output of conductive ink will reach 1.3 million tons by 2015. As the production technology of graphene matures and the cost is reduced, graphene conductive ink will gradually occupy the market share.

 

Field 2: Anticorrosive coating

 

At present, China's anticorrosive coating consumption is nearly 1.8 million tons, accounting for more than 40% of the world's total anticorrosive coating consumption. The demand for anticorrosive coatings in my country is mainly concentrated in the fields of ships, petrochemicals, bridges, and containers. After adding graphene to the coating, graphene can form a stable conductive grid, effectively improving the utilization of zinc powder. From the actual effect, adding about 5% of graphene powder can reduce the usage of 50% of zinc powder. At the same time, the graphene coating can form a physical barrier between the metal surface and the active medium, which plays a good protective effect on the base material.

 

Field 3: Heat dissipation materials

 

The heat dissipation of electronic and photonic devices is the main problem affecting the development of electronic technology. The heat dissipation of mobile phones, computers, microcircuits and other equipment is mainly solved by various heat sinks. Currently, the heat sinks of electronic products in the market are mainly graphite heat sinks. However, the performance of graphene heat conduction sheet is much better than that of graphite sheet, such as fast heat conduction and foldability. Excellent heat dissipation materials such as thermal conductive fiber and thermal conductive plastic, etc., and the technical difficulty is relatively small, the process is relatively mature, and there is a rapid market entry Opportunity. Especially in the field of smart phones, mobile phones are required to be light, thin, portable, and foldable in the future, so graphene thermal film has great advantages. It is estimated that in the future, the heat dissipation components that use graphene heat dissipation film for heat dissipation will account for 10% of the total electronic products and LED product market, which can bring about 1.5 to 2 billion market space for graphene heat dissipation film.

 

Field 4: Lithium battery

 

The application of graphene in lithium-ion batteries is relatively diversified. At present, it has been commercialized as a conductive additive in cathode materials to improve the conductivity of electrode materials, increase rate performance and cycle life. At present, a more mature application is to make graphene into conductive paste for coating positive materials such as iron phosphate. The coating slurry for positive electrode currently mainly includes graphite slurry, carbon nanotube slurry, etc. With the mass production of graphene powder and graphene microplate powder, and the continuous reduction in cost, the graphene slurry will show more Good coating performance. Graphene paste will rise steadily with the growth of lithium batteries. Lithium-ion batteries are mainly used in portable electronic devices such as mobile phones, notebook computers, cameras, etc., and are actively expanding into the field of new energy vehicles such as electric vehicles, and have long-term development prospects.

 

Since graphene has many effects on battery performance, the continuous improvement of power battery performance requirements will surely promote the development of graphene in the battery field. At the same time, the scale of the graphene battery industry is expected to fully benefit from the increase in power batteries and share the growth of the new energy automobile industry.

 

Field 5: Super Capacitor

 

Graphene has a high conductivity, a larger product than the surface, and a stable chemical structure. The surface is released more effectively, which is conducive to the penetration and transportation of electrons, and is more suitable as an electrode material for super capacitors.

 

The good performance of graphene is very suitable for the field of membrane switches, especially as a conductive ink printed in the circuit. I believe that in the near future, we will be able to find graphene in the field of membrane switches.