Exfoliation of a non-van der Waals material from iron ore hematite.

Autor: Puthirath Balan A; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA.; Department of Physics, Cochin University of Science and Technology, Kochi, Kerala, India., Radhakrishnan S; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA., Woellner CF; Applied Physics Department and Center for Computational Engineering and Sciences, State University of Campinas - UNICAMP, Campinas, Brazil., Sinha SK; Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Stuttgart, Germany., Deng L; Texas Center for Superconductivity, University of Houston, Houston, TX, USA., Reyes CL; Department of Chemistry, Rice University, Houston, TX, USA., Rao BM; Department of Physics, University of Houston, Houston, TX, USA., Paulose M; Department of Physics, University of Houston, Houston, TX, USA., Neupane R; Department of Physics, University of Houston, Houston, TX, USA., Apte A; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA., Kochat V; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA., Vajtai R; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA., Harutyunyan AR; Honda Research Institute USA Inc., Columbus, OH, USA., Chu CW; Texas Center for Superconductivity, University of Houston, Houston, TX, USA.; Lawrence Berkeley National Lab, Berkeley, CA, USA., Costin G; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, USA., Galvao DS; Applied Physics Department and Center for Computational Engineering and Sciences, State University of Campinas - UNICAMP, Campinas, Brazil., Martí AA; Department of Chemistry, Rice University, Houston, TX, USA., van Aken PA; Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Stuttgart, Germany., Varghese OK; Department of Physics, University of Houston, Houston, TX, USA., Tiwary CS; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA. cst.iisc@gmail.com., Malie Madom Ramaswamy Iyer A; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA. mraiyer@yahoo.com.; Department of Physics, Cochin University of Science and Technology, Kochi, Kerala, India. mraiyer@yahoo.com., Ajayan PM; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA. ajayan@rice.edu.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2018 Jul; Vol. 13 (7), pp. 602-609. Date of Electronic Publication: 2018 May 07.
DOI: 10.1038/s41565-018-0134-y
Abstrakt: With the advent of graphene, the most studied of all two-dimensional materials, many inorganic analogues have been synthesized and are being exploited for novel applications. Several approaches have been used to obtain large-grain, high-quality materials. Naturally occurring ores, for example, are the best precursors for obtaining highly ordered and large-grain atomic layers by exfoliation. Here, we demonstrate a new two-dimensional material 'hematene' obtained from natural iron ore hematite (α-Fe 2 O 3 ), which is isolated by means of liquid exfoliation. The two-dimensional morphology of hematene is confirmed by transmission electron microscopy. Magnetic measurements together with density functional theory calculations confirm the ferromagnetic order in hematene while its parent form exhibits antiferromagnetic order. When loaded on titania nanotube arrays, hematene exhibits enhanced visible light photocatalytic activity. Our study indicates that photogenerated electrons can be transferred from hematene to titania despite a band alignment unfavourable for charge transfer.
Databáze: MEDLINE
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