Electronic and Vibrational Decoupling in Chemically Exfoliated Bilayer Thin Two-Dimensional V 2 O 5 .

Autor:	P R R; Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Pazhedath A; Materials Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Sinha SK; Physical Metallurgy Division, Materials Metallurgy Group, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Dasgupta A; Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India.; Physical Metallurgy Division, Materials Metallurgy Group, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Karuppiah G; Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India.; Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Prasad AK; Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India.; Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India., Dhara S; Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India.; Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry letters [J Phys Chem Lett] 2021 Oct 14; Vol. 12 (40), pp. 9821-9829. Date of Electronic Publication: 2021 Oct 04.
DOI:	10.1021/acs.jpclett.1c02637
Abstrakt:	The synthesis of high-quality two-dimensional (2D) transition metal oxides is challenging compared to 2D transition metal dichalcogenides as a result of the exotic surface changes that can appear during formation. Herein, we report the synthesis of bilayer 2D V 2 O 5 nanosheets with a thickness of ∼1 nm using the chemical exfoliation method and a comprehensive study on the vibrational and optical properties of bilayer 2D V 2 O 5 . We report, for the first time, a thickness-dependent blue shift of 1.33 eV in the optical bandgap, which signifies the emergence of electronic decoupling in bilayer 2D V 2 O 5 . In addition, a thickness-dependent vibrational decoupling of phonon modes observed via Raman spectroscopy fingerprinting was verified by computing the lattice vibrational modes using the density functional perturbation theory. We demonstrate that the manifestation of the electronic and vibrational decoupling can be used as a benchmark to confirm the successful formation of bilayer 2D V 2 O 5 from its bulk counterpart.
Databáze:	MEDLINE
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