Wirecka Roma, Maćkosz Krzysztof, Żywczak Antoni, Marzec Mateusz Marek, Zapotoczny Szczepan, Bernasik Andrzej
Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Krakow, Poland.
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Krakow, Poland.
Nanomaterials (Basel). 2023 Feb 26;13(5):879. doi: 10.3390/nano13050879.
In the presented study, we have synthesized six nanocomposites based on various magnetic nanoparticles and a conducting polymer, poly(3-hexylthiophene-2,5-diyl) (P3HT). Nanoparticles were either coated with squalene and dodecanoic acid or with P3HT. The cores of the nanoparticles were made of one of three different ferrites: nickel ferrite, cobalt ferrite, or magnetite. All synthesized nanoparticles had average diameters below 10 nm, with magnetic saturation at 300 K varying between 20 to 80 emu/g, depending on the used material. Different magnetic fillers allowed for exploring their impact on the conducting properties of the materials, and most importantly, allowed for studying the influence of the shell on the final electromagnetic properties of the nanocomposite. The conduction mechanism was well defined with the help of the variable range hopping model, and a possible mechanism of electrical conduction was proposed. Finally, the observed negative magnetoresistance of up to 5.5% at 180 K, and up to 1.6% at room temperature, was measured and discussed. Thoroughly described results show the role of the interface in the complex materials, as well as clarify room for improvement of the well-known magnetoelectric materials.
在本研究中，我们基于各种磁性纳米粒子和导电聚合物聚（3 - 己基噻吩 - 2,5 - 二亚基）（P3HT）合成了六种纳米复合材料。纳米粒子要么用角鲨烯和十二烷酸包覆，要么用P3HT包覆。纳米粒子的核心由三种不同铁氧体之一制成：镍铁氧体、钴铁氧体或磁铁矿。所有合成的纳米粒子平均直径均低于10 nm，在300 K时的磁饱和度根据所用材料在20至80 emu/g之间变化。不同的磁性填料有助于探究它们对材料导电性能的影响，最重要的是，有助于研究壳层对纳米复合材料最终电磁性能的影响。借助可变范围跳跃模型明确了传导机制，并提出了一种可能的导电机制。最后，测量并讨论了在180 K时高达5.5%以及在室温下高达1.6%的负磁阻。详细描述的结果显示了界面在复合材料中的作用，同时也阐明了著名的磁电材料的改进空间。
