It is reported that in the past 20 years, scientists have been committed to developing new methods for synthesizing new carbon allotropes, exploring their new properties, and discovering new carbon allotropes such as fullerenes, carbon nanotubes and graphene. As a frontier and hotspot of international academic research, it has formed an independent research field of cross-science. Carbon has three hybrid states of sp3, sp2 and sp. Different heterogeneous states can form allomorphs of various carbons, such as diamond formation by sp3 hybridization, and carbon nanotubes can be formed by sp3 and sp2 hybridization. , fullerenes and graphene. Since the carbon-carbon triple bond formed by the sp hybridization state has the advantages of linear structure, no cis-trans isomer and high conjugate, it has been desired to obtain a new carbon allotrope with sp hybridization state, and it is considered that Carbon-based materials have excellent electrical, optical and optoelectronic properties and are key materials for the next generation of new electronic and optoelectronic devices. Graphene is the first new carbon allotrope formed by the three hybrid states sp, sp2 and sp3, most likely to be artificially synthesized non-natural carbon allotropes.
Researchers in the Key Laboratory of Chemical Solids Institute have long been committed to the study of the synthesis, aggregation structure and properties of carbon materials. After successfully researching the graphene film, Chem.Com's reviewers said in this evaluation: "This is a remarkable development in carbon chemistry. The preparation of large-area graphene films is a real The major findings, the results are very exciting, and will open up a path for the application of large-area graphene films in nanoelectronics."
The results show that graphene is a full carbon molecule which is conjugated to a benzene ring by a 1,3-diyne bond to form a two-dimensional planar network structure. It has abundant carbon chemical bonds, a large conjugated system and a wide interplanar spacing (4.1913Å). ), excellent chemical stability and semiconductor properties. The obtained graphene film has an area of ​​3.61 cm 2 and is a highly crystallized single crystal film. Raman spectroscopy shows that the characteristic peaks are at 1382, 1569, 1926 and 2189 cm-1, and the film is confirmed to have a high order. Degree and lower defects, film conductivity: 10-3-10-4Sm-1.
The discovery of this new carbon allotrope has given birth to a new member of the "family" of carbon materials that is highly valued by the international scientific community. The special electronic structure of graphene has potential and important application prospects in the fields of superconductivity, electronics, energy and optoelectronics.
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