Controlled Vapor-Phase Synthesis of VSe<sub>2</sub> via Selenium-Driven Gradual Transformation of Single-Crystalline V<sub>2</sub>O<sub>5</sub> Nanosheets
We report a gas-phase precursor modulation strategy for the controlled synthesis of 1T-phase vanadium diselenide (VSe<sub>2</sub>) from vanadium pentoxide (V<sub>2</sub>O<sub>5</sub>) nanosheets by systematically adjusting the vapor pressure of selenium. By contro...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-04-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/7/548 |
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| Summary: | We report a gas-phase precursor modulation strategy for the controlled synthesis of 1T-phase vanadium diselenide (VSe<sub>2</sub>) from vanadium pentoxide (V<sub>2</sub>O<sub>5</sub>) nanosheets by systematically adjusting the vapor pressure of selenium. By controlling the selenium vapor pressure, selenium-free vapor transport of vanadium dioxide led to the spontaneous oxidation and formation of tens-of-micrometer-sized rectangular V<sub>2</sub>O<sub>5</sub> crystals, while moderate selenium introduction produced intermediate oxygen-rich phases with trapezoidal crystal facets, and a highly selenium-rich environment yielded trigonal VSe<sub>2</sub> crystals. Raman scattering measurements confirmed the stepwise transformation from V<sub>2</sub>O<sub>5</sub> to VSe<sub>2</sub>, and atomic force microscopy revealed well-defined layered morphologies and distinct conformation within an atomically thin regime. Additionally, high-resolution transmission electron microscopy validated the orthorhombic and trigonal crystal structures of V<sub>2</sub>O<sub>5</sub> and VSe<sub>2</sub>, respectively. This work demonstrates the versatility of fine-tuned vapor-phase growth conditions in vanadium-based layered compounds, providing useful platforms to optimize structural composition with atomic precision. |
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| ISSN: | 2079-4991 |