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

• DOI: 10.1021/acs.jpcc.2c08083
• Publication Date: 2023-02-27T12:37:19Z
• Authors: Monidipa Pramanik; Mukta V. Limaye; Mahendra S. Pawar; Dattatray J. Late; Shashi B. Singh
• Keywords: Blueshift; Ultraviolet photoelectron spectroscopy

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 V2CTx gradually changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size as pressure increased. optical emission spectra show broad blue shift due nitrogen-related defects quantum confinement. X-ray photoelectron spectroscopy shows presence of nitrogen in all samples. ultraviolet study modified density states near Fermi level maximum ∼0.6 eV valence band edge towards higher binding energy side after post-treatment ammonia. More interestingly, E1g Raman becomes degenerate upshifts (∼15 cm–1) increasing treatment. results suggest induced lattice strain post-ammonia treatment plays crucial role deciding electronic properties.