Персона: Попов, Антон Александрович
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Инженерно-физический институт биомедицины
Цель ИФИБ и стратегия развития – это подготовка высококвалифицированных кадров на базе передовых исследований и разработок новых перспективных методов и материалов в области инженерно-физической биомедицины. Занятие лидерских позиций в биомедицинских технологиях XXI века и внедрение их в образовательный процесс, что отвечает решению практикоориентированной задачи мирового уровня – диагностике и терапии на клеточном уровне социально-значимых заболеваний человека.
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Антон Александрович
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- ПубликацияТолько метаданныеFemtosecond laser-ablative synthesis of plasmonic Au and TiN nanoparticles for biomedical applications(2019) Tselikov, G.; Al-Kattan, A.; Popov, A. A.; Kabashin, A. V.; Попов, Антон Александрович; Кабашин, Андрей ВикторовичCopyright © 2019 SPIE.Methods of femtosecond laser ablation and fragmentation in liquids were used to fabricate bare (ligand-free) plasmonic Au and TiN nanoparticles. By varying laser parameters (laser energy, focusing conditions) and environment (deionized water, acetone), we were able to synthesize spherical Au and TiN nanoparticles of variable size between a few of nm and 30-40 nm under a relatively low size dispersion. EDX and XPS tests confirm that both nanoparticle samples consist of gold and titanium nitride in the absence of any impurity. While Au based nanoparticles demonstrate a standard plasmonic extinction peak in the visible green range (520-540 nm), TiN counterparts exhibit a broad red-shifted peak centered around 650-700 nm even for very small nanoparticle sizes (4-5 nm). We finally discuss possible applications of laser-synthesized Au nanoparticles in SERS, SEIRA and electrocatalysis, while TiN nanoparticles are considered as promising sensitizers of photothermal therapies.
- ПубликацияТолько метаданныеLaser ablation-assisted synthesis of plasmonic si@au core-satellite nanocomposites for biomedical applications(2021) Al-Kattan, A.; Tselikov, G.; Metwally, K.; Mensah, S.; Popov, A. A.; Kabashin, A. V.; Попов, Антон Александрович; Кабашин, Андрей Викторович© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Owing to strong plasmonic absorption and excellent biocompatibility, gold nanostruc-tures are among best candidates for photoacoustic bioimaging and photothermal therapy, but such applications require ultrapure Au-based nanoformulations of complex geometry (core-shells, nano-rods) in order to shift the absorption band toward the region of relative tissue transparency (650– 1000 nm). Here, we present a methodology for the fabrication of Si@Au core-satellite nanostruc-tures, comprising of a Si core covered with small Au nanoparticles (NP), based on laser ablative synthesis of Si and Au NPs in water/ethanol solutions, followed by a chemical modification of the Si NPs by 3-aminopropyltrimethoxysilane (APTMS) and their subsequent decoration by the Au NPs. We show that the formed core-satellites have a red-shifted plasmonic absorption feature compared to that of pure Au NPs (520 nm), with the position of the peak depending on APTMS amount, water−ethanol solvent percentage and Si−Au volume ratio. As an example, even relatively small 40-nm core-satellites (34 nm Si core + 4 nm Au shell) provided a much red shifted peak centered around 610 nm and having a large tail over 700 nm. The generation of the plasmonic peak is confirmed by modeling of Si@Au core-shells of relevant parameters via Mie theory. Being relatively small and exempt of any toxic impurity due to ultraclean laser synthesis, the Si@Au core-satellites promise a major advancement of imaging and phototherapy modalities based on plasmonic properties of na-nomaterials.