Post-Ammonia-Treated V2CTx MXene at Different Pressures: Effects on Morphology, Electronic, and Optical Properties

Pramanik, M and Limaye, MV and Pawar, MS and Late, DJ and Singh, SB (2022) Post-Ammonia-Treated V2CTx MXene at Different Pressures: Effects on Morphology, Electronic, and Optical Properties. In: Journal of Physical Chemistry C .

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Abstract

In the present work, vanadium carbide (V2CTx) MXene was synthesized successfully and then treated with an ammonia solution (NH4OH) under different pressures using a hydrothermal process. The sample morphology reveals that the V2CTx MXene gradually changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size sheets as the pressure increased. The optical emission spectra show broad emission and a blue shift due to nitrogen-related defects and quantum confinement. X-ray photoelectron spectroscopy shows the presence of nitrogen in all of the samples. The ultraviolet photoelectron spectroscopy study shows a modified density of states near the Fermi level and a maximum of ∼0.6 eV valence band edge shift towards a higher binding energy side after post-treatment with ammonia. More interestingly, the E1g Raman band becomes degenerate and the E1g band upshifts (∼15 cm-1) with increasing pressure treatment. The Raman results suggest that the induced lattice strain due to post-ammonia treatment plays a crucial role in deciding the optical and electronic properties. © 2023 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Ammonium hydroxide; Binding energy; Blue shift; Carbides; Electronic properties; Emission spectroscopy; Morphology; Nitrogen; Optical lattices; Photoelectrons; Photons; Vanadium compounds; X ray photoelectron spectroscopy, Ammonia solution; Different pressures; Electronic and optical properties; Hydrothermal process; Micrometer sizes; Multi-layered; Nanometer size; Optical emission spectrum; Sample morphology; Synthesised, Ammonia
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Mar 2023 09:58
Last Modified:	17 Mar 2023 09:58
URI:	https://eprints.iisc.ac.in/id/eprint/81036

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