Lego blocks, beloved by each youngsters and adults, might be assembled into set fashions like area shuttles or cool buildings, but additionally can be utilized to construct any new buildings. Like these blocks, a brand new know-how has been proposed to assemble atomic-sized blocks into new supplies.
A POSTECH analysis staff led by Professor Cheol-Joo Kim and Ph.D. candidates Seong-Jun Yang and Ju-Hyun Jung (Division of Chemical Engineering) in collaboration with Dr. Chang Cuk Hwang and Dr. Eunsook Lee (Pohang Accelerator Laboratory) and Professor Pinshane Y. Huang and Ph.D. candidate Edmund Han (College of Illinois Urbana-Champagne) has developed a know-how for assembling wafer-scale movies on the atomic degree. Not too long ago revealed because the entrance cowl paper of Nano Letters, the findings are a results of exactly designing the construction of supplies on the atomic degree.
Crystal movies composed of atoms supply various bodily properties primarily based on the modulation of their thickness or atomic buildings. Various the stacking configuration of those skinny movies — layer-by-layer or twisted — produces totally different bodily properties. Nonetheless, research performed thus far have solely enabled meeting of atomically skinny crystals at a really small-scale as a result of assembling massive wafer-sized skinny movies simply contaminates their interfaces, hindering the emergence of latest properties.
To beat this, the researchers proposed a programmed crystal meeting of graphene and monolayer hexagonal boron nitride (hBN), assisted by van der Waals interactions. This new method produces wafer-scale movies of practically 100% pristine interfaces.
Making use of this new methodology permits large-scale manufacturing of wafer-size synthetic crystalline movies which have been troublesome to make use of as precise units on account of their small dimension. This know-how exhibits promise to assist develop new supplies that emit gentle or conduct electrical energy since it could actually program the construction of a fabric on the atomic degree.
“The atomic-level meeting methodology has been restricted to very small sizes, limiting the invention of properties and know-how improvement to mere verification on the single-device degree,” remarked Professor Cheol-Joo Kim who led the examine. He added, “The findings from this examine have demonstrated the atomic-level precision meeting of single-crystalline supplies on the wafer-scale for the primary time, which will probably be relevant to the event of nanodevices sooner or later.”
This examine was performed with the help from the Younger Researcher Program and the Inventive Supplies Discovery Program of the Nationwide Analysis Basis of Korea.