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Graphene spray gun
A graphene spray gun is a kinetic spray system that deposits, through supersonic acceleration, a one atom thick sheet of pure carbon named graphene by means of a de Laval nozzle,〔 a pinched tube with an hourglass type shape. The system deposits graphene flakes and a hexagonal graphene lattice is created upon impact of the desired surface. The graphene spray gun would be utilized onto large-scale applications such as circuits, radio transmitters, and optical electronics due to the grapehene’s transparency and its remarkable conductivity of electricity.〔 The supersonic spray system was first developed in May 2014 by University of Illinois professor Alexander Yarin, and Korea University professor Sam Yoon. Yarin went to Yoon when he learned about his work regarding kinetic spray deposition systems. Yarin believed that graphene could be applied to the system in order to create a layer of the material. After conducting experiments with the newly created system, they concluded that the graphene spray system was a success.〔 The spray gun is still in its early stages of development, but is considered by many scientists and researchers to be the solution of various predicaments that occur when applying graphene onto large-scale products. The most common problem that would transpire within the other methods is that the layer would be uneven and coated by aggregations. The energy delivered by the supersonic spraying stretches the graphene evenly upon impact, and is the main reason for the spray system’s lack of defects that are common within other graphene deposition methods.〔
==Method==
Reduced graphene oxide, an aqueous fluid supplied with low-quality graphene flakes, is inserted into the de Laval nozzle throat. These precursor molecules are then converted into fine particles during its exposure to supersonic-speed gas stream.〔 The reduced graphene oxide molecules (r-GO’s) are then transformed into tiny droplets in the air subsequent to its deposition from the nozzle. These graphene droplets swiftly evaporate and evenly disperse, all while suspended in the air. Upon making impact on its substrate, the surface of the material, the graphene evenly stretches out and expands due to the high kinetic energy delivered by the de Laval nozzle. A single-atom thick layer of graphene is formed upon the substrate.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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