A Non-van der Waals Two-Dimensional Material from Natural Titanium Mineral Ore Ilmenite

Puthirath Balan, A and Radhakrishnan, S and Kumar, R and Neupane, R and Sinha, SK and Deng, L and De Los Reyes, CA and Apte, A and Rao, BM and Paulose, M and Vajtai, R and Chu, CW and Costin, G and Martí, AA and Varghese, OK and Singh, AK and Tiwary, CS and Anantharaman, MR and Ajayan, PM (2018) A Non-van der Waals Two-Dimensional Material from Natural Titanium Mineral Ore Ilmenite. In: Chemistry of Materials, 30 (17). pp. 5923-5931.

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Abstract

Two-dimensional (2D) materials from naturally occurring minerals are promising and possess interesting physical properties. A new 2D material "Ilmenene" has been exfoliated from the naturally occurring titanate ore ilmenite (FeTiO3) by employing liquid phase exfoliation in a dimethylformamide solvent by ultrasonic bath sonication. Ilmenene displays a 001 orientation that is confirmed by transmission electron microscopy. Probable charge transfer excitation from Fe2+Ti4+ to Fe3+Ti3+ results in ferromagnetic ordering along with the antiferromagnetic phase accompanied by enhanced anisotropy due to surface spins. The 2D nature and band gap states help ilmenene form a heterojunction photocatalyst with titania nanotube arrays, capable of broad spectrum light harvesting and separating/transferring the photogenerated charges effectively for solar photoelectrochemical water splitting.

Item Type:	Journal Article
Publication:	Chemistry of Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society.
Keywords:	Antiferromagnetism; Charge transfer; Dimethylformamide; Energy gap; Heterojunctions; High resolution transmission electron microscopy; Ilmenite; Titanium dioxide; Titanium mines; Transmission electron microscopy; Van der Waals forces; Yarn, Antiferromagnetic phase; Charge-transfer excitations; Ferromagnetic orderings; Photoelectrochemical water splitting; Photogenerated charge; Titania nanotube arrays; Two Dimensional (2 D); Two-dimensional materials, Iron compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	05 Aug 2022 10:41
Last Modified:	05 Aug 2022 10:41
URI:	https://eprints.iisc.ac.in/id/eprint/75379

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