Enhancement in magnetization of two-dimensional cobalt telluride and its magnetic field-assisted photocatalytic activity

Negedu, SD and Tromer, R and Siddique, S and Woellner, CF and Olu, FE and Palit, M and Roy, AK and Pandey, P and Galvao, DS and Kumbhakar, P and Tiwary, CS (2022) Enhancement in magnetization of two-dimensional cobalt telluride and its magnetic field-assisted photocatalytic activity. In: Applied Physics A: Materials Science and Processing, 128 (5).

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Abstract

Magnetism in semiconductor two-dimensional (2D) materials is gaining popularity due to its potential applications in memory devices, sensors, spintronics, and biomedical applications. Here, 2D cobalt telluride (CoTe) has been synthesized from its bulk crystals using a simple and scalable liquid-phase exfoliation method. The ultrathin CoTe shows ~ 400 times enhancement in its magnetic saturation values compared to the bulk form. The UV�Vis absorption spectra reveal superior absorption in the high-energy region, suggesting a semiconducting nature. Furthermore, we explain the bandgap and origin of high magnetic behavior by density functional theory (DFT) calculations. The 2D CoTe shows a larger magnetism compared to bulk CoTe due to the reduced coordination number of the surface atoms, shape anisotropy, and surface charge effect. Additionally, the semiconducting nature and surface charges are fruitfully utilized for degradation of different toxic dyes under magnetic field and visible light irradiation. Therefore, atomically thin magnetic CoTe can give a new perspective to the separation of charge carriers. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

Item Type:	Journal Article
Publication:	Applied Physics A: Materials Science and Processing
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH
Keywords:	Cobalt compounds; Magnetic fields; Medical applications; Morphology; Photocatalytic activity; Semiconductor devices; Surface charge, 2D alloys; Cobalt telluride; Density-functional-theory; Liquid Phase; Liquid phasis; Liquid-phase exfoliation; Magnetic-field; Photocatalytic activities; Telluride; Two-dimensional, Density functional theory
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 May 2022 04:20
Last Modified:	04 May 2022 04:20
URI:	http://eprints.iisc.ac.in/id/eprint/71750

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