Laser-Synthesized Amorphous PdSe$_{\mathrm{2-x}}$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Ushkov, Andrei Belozerova, Nadezhda Dyubo, Dmitriy Martynov, Ilya Syuy, Alexander Tselikov, Daniil Ermolaev, Georgy Bazhenov, Sergey V. Romanov, Roman I. Kruglov, Ivan Popov, Anton A. Chernov, Alexander Bolshakov, Alexey D. Novikov, Sergey Vyshnevyy, Andrey A. Arsenin, Aleksey Kabashin, Andrei V. Tselikov, Gleb I. Volkov, Valentyn |
| author_facet | Ushkov, Andrei Belozerova, Nadezhda Dyubo, Dmitriy Martynov, Ilya Syuy, Alexander Tselikov, Daniil Ermolaev, Georgy Bazhenov, Sergey V. Romanov, Roman I. Kruglov, Ivan Popov, Anton A. Chernov, Alexander Bolshakov, Alexey D. Novikov, Sergey Vyshnevyy, Andrey A. Arsenin, Aleksey Kabashin, Andrei V. Tselikov, Gleb I. Volkov, Valentyn |
| contents | The control of material properties at the atomic scale remains a central challenge in materials science. Transition metal dichalcogenides (TMDCs) offer remarkable electronic and optical properties, but their functionality is largely dictated by their stable crystalline phases. Here we demonstrate a single-step, ligand-free strategy using femtosecond laser ablation in liquid to transform crystalline, stoichiometric palladium diselenide (PdSe$_{\mathrm{2}}$) into highly stable, amorphous, and non-stoichiometric nanoparticles (PdSe$_{\mathrm{2-x}}$, with x$\approx$1). This laser-driven amorphization creates a high density of selenium vacancies and coordinatively unsaturated sites, which unlock a range of emergent functions absent in the crystalline precursor, including plasmon-free surface-enhanced Raman scattering with an enhancement factor exceeding 10$^\mathrm{6}$, a 50-fold increase in photocatalytic activity, and near-infrared photothermal conversion efficiency reaching 83$\%$. Our findings establish laser-induced amorphization as a powerful top-down approach for defect-engineered TMDCs and advances their practical usage in optics, catalysis, and nanomedicine. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_21918 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laser-Synthesized Amorphous PdSe$_{\mathrm{2-x}}$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion Ushkov, Andrei Belozerova, Nadezhda Dyubo, Dmitriy Martynov, Ilya Syuy, Alexander Tselikov, Daniil Ermolaev, Georgy Bazhenov, Sergey V. Romanov, Roman I. Kruglov, Ivan Popov, Anton A. Chernov, Alexander Bolshakov, Alexey D. Novikov, Sergey Vyshnevyy, Andrey A. Arsenin, Aleksey Kabashin, Andrei V. Tselikov, Gleb I. Volkov, Valentyn Materials Science Chemical Physics The control of material properties at the atomic scale remains a central challenge in materials science. Transition metal dichalcogenides (TMDCs) offer remarkable electronic and optical properties, but their functionality is largely dictated by their stable crystalline phases. Here we demonstrate a single-step, ligand-free strategy using femtosecond laser ablation in liquid to transform crystalline, stoichiometric palladium diselenide (PdSe$_{\mathrm{2}}$) into highly stable, amorphous, and non-stoichiometric nanoparticles (PdSe$_{\mathrm{2-x}}$, with x$\approx$1). This laser-driven amorphization creates a high density of selenium vacancies and coordinatively unsaturated sites, which unlock a range of emergent functions absent in the crystalline precursor, including plasmon-free surface-enhanced Raman scattering with an enhancement factor exceeding 10$^\mathrm{6}$, a 50-fold increase in photocatalytic activity, and near-infrared photothermal conversion efficiency reaching 83$\%$. Our findings establish laser-induced amorphization as a powerful top-down approach for defect-engineered TMDCs and advances their practical usage in optics, catalysis, and nanomedicine. |
| title | Laser-Synthesized Amorphous PdSe$_{\mathrm{2-x}}$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion |
| topic | Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2507.21918 |