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[[Vol. 8]Crystal film growth_ nanosheets extend epitaxial growth applications_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/4a67f0bd-56f7-4987-b3fd-843ad30bbc73/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.8] Crystal film growth: nanosheets extend epitaxial growth applications](https://mdr.nims.go.jp/datasets/5a2fbbae-c113-4ddf-b74d-3f921f8c19b6)

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2022/04/04 10:26 Crystal film growth: nanosheets extend epitaxial growth applications| MANAhttps://www.nims.go.jp/mana/research/highlights/vol8.html 1/2Previous  Index  NextResearch Highlights[Vol. 8]Crystal film growth: nanosheets extend epitaxial growth applications12 Dec, 2013Molecularly thin two-dimensional crystals can alleviate the lattice matchingrestrictions of epitaxial crystalline thin film growth, as reported byresearchers in Japan.Figure : Schematic illustration of nanosheet structures for Ca2Nb3O10-,Ti0.87O20.52-, and MoO2δ− nanosheets and corresponding crystal planes ofSrTiO3.Epitaxial growth has become increasingly important for growing crystalline thin films with tailoredelectronic, optical and magnetic properties for technological applications. However, the approach islimited by the high structural similarities required between an underlying substrate and a growingcrystal layer on top of it. Takayoshi Sasaki and colleagues at the International Center for MaterialsNanoarchitectonics (MANA) and the University of Tokyo in Japan demonstrate how using two-dimensional materials they can extend the versatility of epitaxial growth techniques.In 1984, Prof. Koma at the University of Tokyo proposed that certain layered materials such asmica or graphite can be easily cleaved to produce surfaces with no dangling bonds that wouldalleviate the lattice matching requirements for epitaxial growth. Interactions between adatoms onthese cleaved materials would be more prominent compared with growth on single-crystalsubstrates since the van der Waals interactions are weak. However, the variety of suitable cleavedsurfaces is limited and handling them can be difficult.With the increasing attention on two-dimensional materials over recent years, Takayoshi Sasakiand colleagues decided to look into molecularly thin two-dimensional crystals as possible seedlayers to alleviate lattice matching requirements in a manner similar to Koma’s van der Waalsepitaxy. They deposited nanosheets of either Ca2Nb3O10-, Ti0.87O20.52-, or MoO2δ- as a highlyhttps://www.nims.go.jp/mana/research/highlights/vol7.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol9.html2022/04/04 10:26 Crystal film growth: nanosheets extend epitaxial growth applications| MANAhttps://www.nims.go.jp/mana/research/highlights/vol8.html 2/2organised monolayers onto amorphous glass. On these different surfaces, they grew differentorientations of SrTiO3, an important perovskite for various technological applications. The approachdemonstrated the ability to grow different orientations of SrTiO3 with a high level of precision.The researchers suggest that in the future, it would be of great interest to achieve moresophisticated control of growth geometry using nanosheets with a complex structure. They add,“Such advanced design, hardly realized with present technology, will pave a new way for furtherdevelopment of crystal engineering.”Reference"Versatile van der Waals epitaxy-like growth of crystal films using two-dimensional nanosheets as aseed layer: Orientation tuning of SrTiO3 films along three important crystallographic axes of (100),(110) and (111) on glass substrate"Tatsuo Shibata, Hikaru Takano, Yasuo Ebina, Dae Sung Kim, Tadashi C. Ozawa, Kosho Akatsuka,Tsuyoshi Ohnishi, Kazunori Takada, Toshihiro Kogure, and Takayoshi SasakiJournal : J. Mater. Chem. C 2, 441-449 (2013).DOI : 10.1039/C3TC31787KAffiliationsInternational 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/ebina_yasuo?locale=enhttps://samurai.nims.go.jp/profiles/sasaki_takayoshi?locale=enhttps://pubs.rsc.org/en/content/articlelanding/2014/TC/C3TC31787K#!divAbstract