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The Main Classification Of Graphene

wallpapers Tech 2020-12-24
Graphene is a two-dimensional carbon nanomaterial with a hexagonal honeycomb lattice composed of carbon atoms and sp² hybrid orbitals.
 
Graphene has excellent optical, electrical, and mechanical properties, and has important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery. It is considered a revolutionary material in the future. The physicists Andre Gaim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully separated graphene from graphite using the micromechanical exfoliation method, and therefore jointly won the 2010 Nobel Prize in Physics. The common powder production methods of graphene are mechanical peeling method, redox method, SiC epitaxial growth method, and the thin film production method is chemical vapor deposition (CVD).
 
Main classification
 
Single layer graphene
Single-layer graphene: refers to a two-dimensional carbon material composed of a layer of carbon atoms periodically and closely packed in a benzene ring structure (ie, hexagonal honeycomb structure).
 
Multilayer Graphene
 
Multi-layer graphene is also called thick-layer graphene: it refers to the benzene ring structure (ie hexagonal honeycomb structure) with a thickness of more than 10 layers and less than 10 nm. The carbon atoms are periodically and closely packed in different stacking methods (including ABC stacking, ABA stacking) Etc.) A two-dimensional carbon material composed of stacks.
 


Main application
 
With the gradual breakthrough of mass production and large-size problems, the industrial application of graphene is accelerating. Based on existing research results, the first commercial applications may be mobile devices, aerospace, and new energy. Battery field.
 
Basic research
 
Graphene has a special significance for basic research in physics. It enables some quantum effects that can only be demonstrated theoretically before can be verified through experiments. In two-dimensional graphene, the mass of electrons does not seem to exist. This property makes graphene a rare condensed matter that can be used to study relativistic quantum mechanics-because massless particles must move at the speed of light Therefore, it must be described by relativistic quantum mechanics, which provides theoretical physicists with a new research direction: some experiments that originally needed to be carried out in giant particle accelerators can be carried out with graphene in small laboratories.
 
Zero energy gap semiconductors are mainly single-layer graphene, and this electronic structure will seriously affect the role of gas molecules on its surface. Compared with bulk graphite, the function of single-layer graphene to enhance the surface reaction activity is shown by the results of graphene hydrogenation and oxidation reactions, indicating that the electronic structure of graphene can modulate the surface activity. In addition, the electronic structure of graphene can be correspondingly changed by the induction of gas molecule adsorption, which not only changes the concentration of carriers, but also can be doped with different graphenes.
 
Sensor
 
Graphene can be made into a chemical sensor. This process is mainly done through the surface adsorption properties of graphene. According to the research of some scholars, the sensitivity of graphene chemical detectors can be compared with the limit of single molecule detection. The unique two-dimensional structure of graphene makes it very sensitive to the surrounding environment. Graphene is an ideal material for electrochemical biosensors. Sensors made of graphene have good sensitivity for detecting dopamine and glucose in medicine.

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