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Figure 1. The technology accumulation of the graphene technology team of Suzhou Nanometer Institute for the preparation of high-quality thin layer graphene (Few layer graphene).
Figure 2. High-quality thin-layer graphene product microscopic topography (Few layer graphene shows a pleated gauze-like topography, morphology and thickness comparable to graphene oxide (GO) with several atomic layers, and Different from the thickness of a few nanometers, the graphite sheet shows a hard lamellar morphology.
Figure 3. Raman spectra of high-quality thin-layer graphene products. The weakly disordered peak (D peak) is comparable to the raw material D peak, and the disordered structure such as defects are not introduced in the preparation process, and the high quality of the graphene product is reflected.
Figure 4. High conductivity of high-quality thin-film graphene powders. The intrinsic high electrical conductivity of the graphite sheet is retained.
High-quality thin-layer graphene has excellent properties such as intrinsic electrical conductivity and thermal conductivity of graphene, and its large-scale preparation has always been a huge challenge in the graphene industry. The Graphene preparation team of the Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences, has been working hard to develop high-quality thin-layer graphene scale preparation technology. It has accumulated profound technology in the preparation of high-quality thin-layer graphene and has obtained high-quality graphene. The technical breakthroughs of interlayer catalytic dissociation preparation, electrochemical intercalation cleavage preparation, high-density three-dimensional graphene, and controllable layer number of graphene (Scientific Reports 3, 1134 (2013); Small 10, 1421 (2014); Scientific Reports 3, 2125 (2013); Adv. Func. Mater. 22, 3153, (2012); Adv. Mater. 22, 638 (2010), shown in Figure 1). At present, it has applied for more than 20 related patents and obtained 5 authorizations.
In order to promote the above-mentioned transfer, transformation and industrialization of the technology, Suzhou Nano aims at the market demand and transfers the technology to the Suzhou Ge Ruifeng Nano Technology Co., Ltd. (hereinafter referred to as “Gredon Corporationâ€), which is based on the above technologies. Continuously improve the quality of graphene products, reduce the number of layers, optimize performance, reduce costs, and actively promote the industrial application of high-quality thin-film graphene products in terms of electrical conductivity and thermal conductivity.
After intensive research, Gryphon has officially launched high quality thin layer graphene (Few layer graphene) powder products with typical thicknesses of 1 nm and 2-3 nm, respectively. The typical thickness of 1 nm product has ultra-thin thickness of ~3 atomic layers, almost perfect crystallization quality, product purity, layer thickness, size, conductivity, thermal conductivity and other comprehensive performance indicators have reached the international leading level in the same period. At present, the scale of the product has been initially enlarged to meet the needs of scientific and technological R&D and industrial applications.
Graphene-related materials are divided according to their thickness. Graphene is the monoatomic layer, Bilayer graphene is the double atomic layer, and Trilayer graphene is the triatomic layer, about 10 Below the atomic layer is called Few layer graphene. Others include Multi-layer graphene (<10 nm thick), Graphene nanoplatelets (or Graphene nanosheets, <100 nm). Intuitively, several atomic layer graphenes appear as highly pleated gauze-like topographies, while thick graphene microchips usually exhibit hard lamellar morphology (Fig. 2 shows several atomic layer high-quality thin films introduced by the team from Gregfont). Scanning Electron Microscopy (SEM) Image of Layer Graphene Product). The more accurate typical thickness is obtained by high-resolution transmission electron microscopy and atomic force microscopy.
Conventional redox production processes have been able to achieve mass production. Thin layer or even single atomic layer of reduced graphene oxide (rGO) can be achieved, and it has the advantage of aqueous dispersion. However, the traditional redox preparation process cannot achieve the The non-destructive preparation of olefinic features allows the best retention of the optimal electrical and thermal conductivity of graphene.
The high-quality thin-layered graphene powder produced by Grfone Corporation uses an intercalation and cleavage method, which is different from the traditional oxidation process. The intercalation and cleavage process does not destroy the original sp2 crystal structure of the graphite layer, and the retained graphite layer is excellent. Conductive and thermal conductivity. A high-quality graphene Raman spectrum gives the D peak of the disordered structure, which is comparable to the raw material (Figure 3). Films made from high-quality thin layer graphene powders have electrical conductivity as high as 105 S/m, indicating that the single-layer conductivity in the layer is much higher than this, which is the most ideal level in the world (Figure 4).
The Few-layer graphene powder developed on the basis of Suzhou Nanotechnology is the company's technologically superior product. Reagent-grade, high-quality thin-film graphenes range in thickness from single atoms to several atomic layers. Typical product thicknesses can be divided into ~ 1 nm and ~2-3 nm, with perfect crystallinity, almost no functional groups, topologies Defects and metal ion impurities. Its applications will cover areas such as electrical conductivity, antistatic, thermal conductivity, electrical heating, heat dissipation, functional pastes, composite systems, and inks. At the same time, high-conductivity, high-thermal-conductivity slurry products made from industrial-grade, high-quality thin-layer graphene (typically about 3-5 nm thick) powders can be used on a large scale in industrial applications.
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