Pastukh Oleksandr, Laskowska Magdalena, Jędryka Jarosław, Zubko Maciej, Laskowski Łukasz
Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland.
Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Czestochowa, Poland.
Int J Mol Sci. 2025 Aug 29;26(17):8413. doi: 10.3390/ijms26178413.
Manganese oxides have recently gained a lot of interest from scientists due to their unique structural, magnetic and optical properties, which make them favorable for diverse nanotechnological applications. Most applications, however, require stable and well-dispersed nanoparticles of nanometer size. Therefore, in this work, we show a procedure for obtaining separated crystallites of manganese oxide Mn3O4 on the surface of spherical silica carriers. The morphology and properties of nanoparticles were analyzed based on transmission electron microscopy observations, Raman spectroscopy, and low-temperature SQUID measurements. The analysis of results revealed the formation of well-dispersed Mn3O4 nanoparticles with an average size of approximately 9 nm. The magnetic measurements confirmed the characteristic critical temperature, and a narrow hysteresis loop appeared due to the surface anisotropy of nanoparticles. It was additionally demonstrated that such small nanoparticles possess pronounced nonlinear optical properties, as evidenced by strong signals of second and third harmonic generation. The obtained results fully confirmed the synthesis assumptions and offer promising prospects for the development of a new class of highly optically active manganese-based nanocomposites.
由于其独特的结构、磁性和光学性质，氧化锰最近引起了科学家们的广泛关注，这些性质使其适用于各种纳米技术应用。然而，大多数应用需要稳定且分散良好的纳米级颗粒。因此，在这项工作中，我们展示了一种在球形二氧化硅载体表面获得分离的氧化锰Mn3O4微晶的方法。基于透射电子显微镜观察、拉曼光谱和低温超导量子干涉仪测量对纳米颗粒的形态和性质进行了分析。结果分析表明形成了平均尺寸约为9nm的分散良好的Mn3O4纳米颗粒。磁性测量证实了特征临界温度，并且由于纳米颗粒的表面各向异性出现了窄磁滞回线。此外还证明了这种小纳米颗粒具有明显的非线性光学性质，二次和三次谐波产生的强信号证明了这一点。所获得的结果完全证实了合成假设，并为开发一类新型的高光学活性锰基纳米复合材料提供了广阔的前景。
