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Photoluminescent Si-based nanocrystals prepared by pulsed laser ablation in low-pressure helium-nitrogen mixtures for biomedical applicationsстатья Исследовательская статья
Информация о цитировании статьи получена из
Scopus
Дата последнего поиска статьи во внешних источниках: 12 августа 2020 г.
- Авторы: Kharin A.Yu, Fronya A.A., Antonenko S.V., Karpov N.V., Derzhavin S.I., Dombrovska Y.I., Garmash A.A., Kargin N.I., Klimentov S.M., Timoshenko V.Yu, Kabashin A.V.
- Журнал: Proceedings of SPIE - Synthesis and Photonics of Nanoscale Materials XVII
- Том: 11269
- Год издания: 2020
- Первая страница: 1126903
- DOI: 10.1117/12.2551482
- Аннотация: 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) on the surface of Si-NCs. 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.
- Добавил в систему: Тимошенко Виктор Юрьевич