Photoluminescent Si-based nanocrystals prepared by pulsed laser ablation in low-pressure helium-nitrogen mixtures for biomedical applications
| Autor: | V. Yu. Timoshenko, N. V. Karpov, N. I. Kargin, Andrei V. Kabashin, Yaroslava I. Dombrovska, A Yu Kharin, S. M. Klimentov, A A Fronya, A. A. Garmash, S V Antonenko, S. I. Derzhavin |
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| Přispěvatelé: | The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], A. M. Prokhorov General Physics Institute (GPI), Russian Academy of Sciences [Moscow] (RAS), Lomonosov Moscow State University (MSU), Laboratoire Lasers, Plasmas et Procédés photoniques (LP3), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Silicon
Materials science Photoluminescence Scanning electron microscope [SDV]Life Sciences [q-bio] Analytical chemistry chemistry.chemical_element 02 engineering and technology 01 natural sciences Spectral line 010309 optics [SPI]Engineering Sciences [physics] 0103 physical sciences [CHIM]Chemical Sciences Helium Nanocrystalline silicon pulsed laser ablation in gas 021001 nanoscience & nanotechnology Nitrogen Amorphous solid chemistry Nanocrystal nanoparticles photoluminescence films 0210 nano-technology |
| Zdroj: | Synthesis and Photonics of Nanoscale Materials XVII SPIE LASE SPIE LASE, Feb 2020, San Francisco, United States. ⟨10.1117/12.2551482⟩ |
| DOI: | 10.1117/12.2551482⟩ |
| Popis: | International audience; Nanocrystalline silicon (Si) films were synthesized by nanosecond laser ablation of crystalline Si targets in low-pressure helium (He) and nitrogen (N2) gas mixtures. Photoluminescence (PL) spectra of the prepared samples were found to depend on the He/N2 ratio in the gas mixture. The ablation pure He atmosphere allowed us to prepare Si nanocrystals (NCs) exhibiting a PL band in red-near-IR range, while samples prepared in the presence of N2 exhibited a strong PL band with maximum in the green-yellow region. Such a modification of PL properties can be explained by the presence of amorphous Si oxynitride (a-SiNxOy) at the surface of Si nanocrystals. Structural studies of the prepared samples by means of the scanning electron microscopy revealed different morphology for Si-NCs produced under different gas mixtures. After treating of the films by ultrasound and dispersing in water, Si-NCs can be used as novel biodegradable markers for bioimaging, while the observed spectral tailoring effect makes possible an adjustment of the PL emission of such markers to a concrete bioimaging task. |
| Databáze: | OpenAIRE |
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