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Interdisciplinary cross-innovation space How to prepare graphene with precise and controllable structure is the key to breaking the bottleneck of its application. Researcher of the Institute of Metals, Chinese Academy of Sciences, said that the strategy of controlling the number of graphene layers by using different sizes and crystallinities of graphite materials can produce single-layer, double-layer and three-layer high-quality graphene in macro. His research group has prepared a single-layer graphene film with uniform surface and dense surface by electrophoretic deposition method. This graphene film has excellent field emission characteristics, low on-state electric field and threshold, good field emission stability and uniformity.
Researcher Wang Zhaohui of the Institute of Chemistry of the Chinese Academy of Sciences is considering the preparation of graphene by chemical synthesis, which solves many key problems such as controllable preparation of high-quality graphene, regulation of graphene structure and physical properties, and application of graphene materials.
"As a kind of carbon nanomaterial developed rapidly in recent years, the research of graphene has just started, and there are a lot of scientific problems waiting for us to study. This is a new field with a lot of innovation space, and it is a frontier cross field. , is waiting for the concerted efforts of scientists in different fields." Zhu Daoben told reporters.
Domestic exploration step by step Currently, Chinese researchers are actively exploring the field of graphene. With the various characteristics being discovered one after another, it is believed that large-scale, low-cost industrial production can be invested in the near future.
Researcher Wang Enge of the Institute of Physics, Chinese Academy of Sciences, etc., successfully produced high-quality graphene by stripping-re-embedding-expansion method, and made large-area transparent conductive film by LB (single-molecule or multi-molecular layer) membrane assembly technology. The large-scale application is of great significance. In 2009, researchers at the Institute of Chemistry of the Chinese Academy of Sciences explored a method for preparing patterned graphene and successfully applied it to electrodes with organic field effect transistors.
Also in 2009, researcher Ma Yanwei of the Institute of Electrical Engineering of the Chinese Academy of Sciences and other methods used paraphenyleneamine to reduce graphite oxide nanosheets, successfully prepared graphene materials with high stability organic solvent dispersion, and obtained highly conductive graphite by electrophoretic deposition. Alkene film. The graphene prepared by the method has good dispersing performance, high yield, good electrical conductivity and low cost, and is expected to be applied to fields such as supercapacitors and composite functional materials.
In addition, the Lanzhou Institute of Chinese Academy of Sciences also produced graphene in May this year, meeting the requirements of low energy consumption, low cost and high output in practical applications.
High-frequency applications or breakthroughs From 2006 to 2008, graphene has been made into ballistic transport transistors and planar FETs, which has attracted the interest of researchers. The industry believes that graphene is likely to be used first in high-frequency fields, such as terahertz microwave imaging. In addition, due to its high conductivity and light transmission, it can also be used in transparent electrodes, touch screens, liquid crystal displays, organic photovoltaic cells and supercapacitors.
The calculation results of the Institute of Digital and Systems Science of the Chinese Academy of Sciences show that the ideal strength of graphene is 110-121 GPa, which means that this is the most solid material known to man and can be widely used as an additive in high-strength composite materials. The thickness of graphene is only 0.335 nm. The most prominent feature is the extremely fast electron transport speed, high chemical stability and thermodynamic stability, and it is expected to replace silicon in the production process of electronic products.
Experts from the School of Materials Science and Engineering at Southwest University of Science and Technology said that graphene-based circuits may not appear until 2025. Silicon circuits will dominate until then, but the prospects are undoubtedly optimistic because of the edges of graphene sheets. There is basically no limit to the size. Experts are optimistic that just 10 years ago, the length of carbon nanotubes was less than 1 micron, and it is now possible to make nanotubes a few centimeters long. It is foreseeable that the same result will also appear on graphene.
Graphene made of graphite is the most intensive substance known to mankind, and its development prospects are fascinating. It can not only develop ultra-light aircraft materials that are as thin as paper, ultra-tough body armor, but even open the door to the manufacture of "space elevator" cables. However, the premise is that the technical problems of macro and controllable preparation must be solved first. Academician Zhu Daoben of the Institute of Chemistry of the Chinese Academy of Sciences pointed out that obtaining large-area and uniform graphene is a difficult point in the preparation of graphene. By exploring the ring-opening reaction of benzene compounds under certain conditions to synthesize graphene, it is most likely to take the lead in achieving breakthroughs.