Show simple item record

dc.contributor.authorSreepal, Vishnu
dc.contributor.authorYagmurcukardes, Mehmet
dc.contributor.authorVasu, Kalangi S.
dc.contributor.authorKelly, Daniel J.
dc.contributor.authorTaylor, Sarah F. R.
dc.contributor.authorKravets, Vasyl G.
dc.contributor.authorNair, Rahul R.
dc.descriptionTaylor, Sarah F R/0000-0002-6175-2631; Kelly, Daniel J/0000-0003-1318-3515; Kudrynskyi, Zakhar/0000-0003-3983-9316; Sahin, Hasan/0000-0002-6189-6707; Raveendran Nair, Rahul/0000-0002-7972-8250; Haigh, Sarah/0000-0001-5509-6706en_US
dc.descriptionWOS: 000486361900083en_US
dc.descriptionPubMed: 31426634en_US
dc.description.abstractMost of the studied two-dimensional (2D) materials have been obtained by exfoliation of van der Waals crystals. Recently, there has been growing interest in fabricating synthetic 2D crystals which have no layered bulk analogues. These efforts have been focused mainly on the surface growth of molecules in high vacuum. Here, we report an approach to making 2D crystals of covalent solids by chemical conversion of van der Waals layers. As an example, we used 2D indium selenide (InSe) obtained by exfoliation and converted it by direct fluorination into indium fluoride (InF3), which has a nonlayered, rhombohedral structure and therefore cannot possibly be obtained by exfoliation. The conversion of InSe into InF3 is found to be feasible for thicknesses down to three layers of InSe, and the obtained stable InF3 layers are doped with selenium. We study this new 2D material by optical, electron transport, and Raman measurements and show that it is a semiconductor with a direct bandgap of 2.2 eV, exhibiting high optical transparency across the visible and infrared spectral ranges. We also demonstrate the scalability of our approach by chemical conversion of large-area, thin InSe laminates obtained by liquid exfoliation, into InF3 films. The concept of chemical conversion of cleavable thin van der Waals crystals into covalently bonded noncleavable ones opens exciting prospects for synthesizing a wide variety of novel atomically thin covalent crystals.en_US
dc.publisherAmer Chemical Socen_US
dc.subjectIndium selenideen_US
dc.subjectindium fluorideen_US
dc.subject2D covalent crystalen_US
dc.subjectvan der Waals materialsen_US
dc.titleTwo-Dimensional Covalent Crystals by Chemical Conversion of Thin van der Waals Materialsen_US
dc.relation.journalNano Lettersen_US
dc.contributor.departmentIzmir Institute of Technologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.cont.department-temp[Sreepal, Vishnu; Vasu, Kalangi S.; Haigh, Sarah J.; Nair, Rahul R.] Univ Manchester, Natl Graphene Inst, Manchester M13 9PL, Lancs, England; [Sreepal, Vishnu; Vasu, Kalangi S.; Taylor, Sarah F. R.; Hardacre, Christopher; Nair, Rahul R.] Univ Manchester, Sch Chem Engn & Analyt Sci, Manchester M13 9PL, Lancs, England; [Yagmurcukardes, Mehmet; Peeters, Francois M.] Univ Antwerp, Dept Phys, Groenenborgerlaan 171, B-2020 Antwerp, Belgium; [Kelly, Daniel J.; Haigh, Sarah J.] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England; [Kravets, Vasyl G.; Grigorenko, Alexander N.; Eaves, Laurence; Geim, Andre K.] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England; [Kudrynskyi, Zakhar; Patane, Amalia; Eaves, Laurence] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England; [Kovalyuk, Zakhar D.] Natl Acad Sci Ukraine, Inst Problems Mat Sci, Chernivtsi Branch, UA-58001 Chernovtsy, Ukraine; [Sahin, Hasan] Izmir Inst Technol, Dept Photon, TR-35430 Izmir, Turkeyen_US

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record