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Production of magnetic nanoparticles water colloids by pulsed laser ablation of thin Co filmsтезисы доклада
- Авторы: Dzhun I.O., Nesterov V.Yu, Shuleiko D.V., Presnov D.E., Konstantinova E.A., Zabotnov S.V., Chechenin N.G.
- Сборник: Book of Abstracts VII International Conference on Ultrafast Optical Science UltrafastLight-2023
- Тезисы
- Год издания: 2023
- Место издания: Lebedev Physical Institute Moscow
- Первая страница: 121
- Последняя страница: 121
- Аннотация: Magnetic nanoparticles (MNPs) are widely used in biomedical applications such as magnetic targeting, magnetic hyperthermia, and biosensors. That is why one needs a method to produce pure MNPs colloids with desirable characteristics such as the MNPs size. Herein, we prepared MNP colloids via pulsed laser ablation (PLAL) in distilled water of thin Co films which were magnetron sputtered onto glass substrates. The Co film thicknesses range was 5–500 nm. All produced colloids were examined by placing a magnet to cuvette surface and all of them demonstrated a magnetic response. Magnetic properties of the produced MNPs were also confirmed by ferromagnetic resonance investigations. Raman spectra for all obtained MNPs are typical ones for Guite (Co2+Co23+O4).The mean MNPs size in colloids was determined as the hydrodynamic diameter by dynamic light scattering measurements. At decrease of ablated Co film thickness from 500 to 50 nm, the MNPs size slightly increases from 80 to 100 nm while at further decrease to the skin layer region (25 and 15 nm) the tenfold growth in size up to 1 μm is observed. After, the size decays to 150 nm at 5 nm Co film. Generation of the MNPs from the films comparable to the skin layer was also characterized a narrower size distribution (the standard deviation of 20% vs 40% for 50-500 nm films). These effects seem to be caused by the difference of PLAL mechanisms and by peculiarities of thermal diffusion at the film-substrate interface and increased heating of the surrounding liquid medium.
- Добавил в систему: Джунь Ирина Олеговна