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[[Vol. 15]Revealing the _Scotch-tape_ technique mechanism_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/d33134bb-991d-4ff1-868b-e2617f849cdf/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.15] Revealing the "Scotch-tape" technique mechanism](https://mdr.nims.go.jp/datasets/e7dfc640-6a55-4703-8a9e-e9b982397590)

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2022/04/04 10:22 Revealing the "Scotch-tape" technique mechanism| MANAhttps://www.nims.go.jp/mana/research/highlights/vol15.html 1/2Previous  Index  NextResearch Highlights[Vol. 15]Revealing the "Scotch-tape" technique mechanism27 Jun, 2014First In-Tandem Experimental and Theoretical Modeling of a Famous “Scotch-Tape” Technique for Making Two-Dimensional Graphene-like Nanosheets.Figure : Nanomechanical cleavage of molybdenum disulphide atomic layers. (left)Schematics of the experimental setup inside HRTEM. (center) TEM image of a sharplyetched tungsten nanoprobe in contact with the MoS2 single crystal deliberately placedwith (0002) basal atomic planes viewed edge-on. (right) HRTEM image of a cleavedMoS2 atomic monolayer.The simplest mechanical cleavage technique using a primitive “Scotch” tape has resulted in theNobel-awarded discovery of graphenes and is currently under worldwide use for assemblinggraphenes and other two-dimensional (2D) graphene-like structures toward their utilization innovel high-performance nanoelectronic devices.The simplicity of this method has initiated a booming research on 2D materials. However, theatomistic processes behind the micromechanical cleavage have still been poorly understood.A joined team of experimentalists and theorists from the International Center for Young Scientists,International Center for Materials Nanoarchitectonics and Surface Physics and Structure Unit of theNational Institute for Materials Science, National University of Science and Technology “MISiS”(Moscow, Russia), Rice University (USA) and University of Jyväskylä (Finland) led by Daiming Tangand Dmitri Golberg for the first time succeeded in complete understanding of physics, kinetics andenergetics behind the regarded “Scotch-tape” technique using molybdenum disulphide (MoS2)atomic layers as a model material.The researchers developed a direct in situ probing technique in a high-resolution transmissionelectron microscope (HRTEM) to investigate the mechanical cleavage processes and associatedmechanical behaviors. By precisely manipulating an ultra-sharp metal probe to contact the pre-existing crystalline steps of the MoS2 single crystals, atomically thin flakes were delicately peeledoff, selectively ranging from a single, double to more than 20 atomic layers. The team found thatthe mechanical behaviors are strongly dependent on the number of layers. Combination of insitu HRTEM and molecular dynamics simulations reveal a transformation of bending behavior fromhttps://www.nims.go.jp/mana/research/highlights/vol14.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol16.html2022/04/04 10:22 Revealing the "Scotch-tape" technique mechanism| MANAhttps://www.nims.go.jp/mana/research/highlights/vol15.html 2/2spontaneous rippling (< 5 atomic layers) to homogeneous curving (~ 10 layers), and finally tokinking (20 or more layers).By considering the force balance near the contact point, the specific surface energy of aMoS2 monoatomic layer was calculated to be ~0.11 N/m. This is the first time that thisfundamentally important property has directly been measured.After initial isolation from the mother crystal, the MoS2 monolayer could be readily restacked ontothe surface of the crystal, demonstrating the possibility of van der Waals epitaxy. MoS2 atomiclayers could be bent to ultimate small radii (1.3 ~ 3.0 nm) reversibly without fracture. Such ultra-reversibility and extreme flexibility proves that they could be mechanically robust candidates forthe advanced flexible electronic devices even under extreme folding conditions.Reference"Nanomechanical cleavage of molybdenum disulphide atomic layers"Daiming Tang, Dmitry G. Kvashnin, Sina Najmaei, Yoshio Bando, Koji Kimoto, Pekka Koskinen,Pulickel M. Ajayan, Boris I. Yakobson, Pavel B. Sorokin, Jun Lou, Dmitri GolbergJournal : Nature Communications 5:3631 (2014).DOI : 10.1038/ncomms4631AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/tang_daiming?locale=enhttps://samurai.nims.go.jp/profiles/bando_yoshio?locale=enhttps://www.nature.com/articles/ncomms4631