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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2025-04-01
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| author | Gangtae Jin |
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| description | 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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| language | English |
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| spelling | doaj-art-fde309c370ac46beb1a7acf17fa7ced32025-08-20T02:09:11ZengMDPI AGNanomaterials2079-49912025-04-0115754810.3390/nano15070548Controlled Vapor-Phase Synthesis of VSe<sub>2</sub> via Selenium-Driven Gradual Transformation of Single-Crystalline V<sub>2</sub>O<sub>5</sub> NanosheetsGangtae Jin0Department of Electronic Engineering, Gachon University, Seongnam 13120, Republic of KoreaWe 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.https://www.mdpi.com/2079-4991/15/7/548VSe<sub>2</sub>V<sub>2</sub>O<sub>5</sub>CVDtransformation |
| spellingShingle | Gangtae Jin 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 Nanomaterials VSe<sub>2</sub> V<sub>2</sub>O<sub>5</sub> CVD transformation |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | VSe<sub>2</sub> V<sub>2</sub>O<sub>5</sub> CVD transformation |
| url | https://www.mdpi.com/2079-4991/15/7/548 |
| work_keys_str_mv | AT gangtaejin controlledvaporphasesynthesisofvsesub2subviaseleniumdrivengradualtransformationofsinglecrystallinevsub2subosub5subnanosheets |