New achievements in the preparation of graphene will promote the development of medicine and other fields
Recently, Zhongjing Group, a young teacher of the School of Civil Engineering of Harbin Institute of Technology, has cooperated with researchers from domestic and foreign research institutes and universities to achieve a series of new achievements in the construction and preparation of graphene-based macroscopic bodies.
Among them, in view of the difficulty of large-scale effective orientation and dense assembly of graphene, the researchers proposed that the centrifugal force and shear stress generated by the centrifugal casting method can realize the high-efficiency large-scale high-orientation and compact assembly of two-dimensional materials. Efficient preparation of graphene films and graphene composites.
It is reported that the method has strong versatility and can be extended to the efficient preparation of boron nitride film, molybdenum disulfide film and heterojunction.
The author understands that these two-dimensional materials also belong to the current hot cutting-edge technology fields, in medicine, printed electronics, flexible electronics, microelectronics, memory, processors, superlenses, terahertz, supercapacitors, solar cells, anti-counterfeit labels, quantum Points, sensors, semiconductor manufacturing, NFC, medical, etc. are all used.
Among them, cubic boron nitride film has many excellent physical and chemical properties, and is widely used in machining, high temperature electronic devices, optical protective films, semiconductors, heat sinks, photoelectric switches, tools, and heat and acid resistant, corrosion resistant coatings, etc. aspect.
The molybdenum disulfide film has excellent photoelectric properties and has become a research hotspot. The industry said that if the graphene film is extended to the preparation of molybdenum disulfide film, it will promote the application of molybdenum disulfide in the semiconductor field.
Related experts said that molybdenum disulfide has similar mechanical and electrical properties to graphene, but there is a big difference in the energy band, because graphene has zero band gap, and molybdenum disulfide has a large direct band gap. It is used to prepare high-efficiency red light-emitting devices, photovoltaic devices and photodetector devices, and has broad application prospects in the fields of light-emitting devices, high-efficiency solar cells, and light detection.
Heterojunctions are junctions formed by different semiconductors, including pn junctions, np junctions, pp junctions and nn junctions, which can promote innovations in the design of electronic devices such as photodetectors, photovoltaic devices, and LEDs, giving these devices many new features.
The industry said that at present, the use of heterojunction in nanotechnology is attractive to scientists, but its development has been affected by complexity, time-consuming, manufacturing processes and so on. Manual manufacturing methods have been unable to meet the production needs of some electronics industries.
In this context, countries are also actively exploring new methods. For example, a research team at the Institute of Production Technology at the University of Tokyo recently developed an automated robot that dramatically increased the speed of two-dimensional crystal acquisition and assembly into a van der Waals heterojunction.
It is understood that when robots assemble graphene sheets into van der Waals heterojunctions, they can stack four layers per hour, each layer requiring only a few minutes of manual input. This will also greatly promote the production of heterojunctions, increase their use in electronic devices, and reduce the cumbersome processes and high costs of manual operations.
Nowadays, China has made new achievements in the construction and preparation of graphene-based macroscopic bodies, and will exert more potential applications in nano drug-loading, biological detection, tumor treatment, cell imaging, etc., and promote the rapid development of the medical field. It will further promote the development of domestic boron nitride film, molybdenum disulfide film and high-efficiency preparation of heterojunction, which will be a gratifying event for China's pharmaceutical, mechanical equipment, electronic devices and other industries.
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