Photoluminescent Si-based nanocrystals prepared by pulsed laser ablation in low-pressure helium-nitrogen mixtures for biomedical applications

A. Yu. Kharin; A. A. Fronya; S. V. Antonenko; N. V. Karpov; S. I. Derzhavin; Y. I. Dombrovska; A. A. Garmash; N. I. Kargin; S. M. Klimentov; V. Yu. Timoshenko; A. V. Kabashin

doi:10.1117/12.2551482

2 March 2020 Photoluminescent Si-based nanocrystals prepared by pulsed laser ablation in low-pressure helium-nitrogen mixtures for biomedical applications

A. Yu. Kharin, A. A. Fronya, S. V. Antonenko, N. V. Karpov, S. I. Derzhavin, Y. I. Dombrovska, A. A. Garmash, N. I. Kargin, S. M. Klimentov, V. Yu. Timoshenko, A. V. Kabashin

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Proceedings Volume 11269, Synthesis and Photonics of Nanoscale Materials XVII; 1126903 (2020) https://doi.org/10.1117/12.2551482
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

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-SiN_xO_y) 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.

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A. Yu. Kharin, A. A. Fronya, S. V. Antonenko, N. V. Karpov, S. I. Derzhavin, Y. I. Dombrovska, A. A. Garmash, N. I. Kargin, S. M. Klimentov, V. Yu. Timoshenko, and A. V. Kabashin "Photoluminescent Si-based nanocrystals prepared by pulsed laser ablation in low-pressure helium-nitrogen mixtures for biomedical applications", Proc. SPIE 11269, Synthesis and Photonics of Nanoscale Materials XVII, 1126903 (2 March 2020); https://doi.org/10.1117/12.2551482

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