Ozkan Sveta, Petrov Valeriy, Vasilev Andrey, Chernavskii Petr, Efimov Mikhail, Muratov Dmitriy, Pankina Galina, Karpacheva Galina
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, Moscow 119991, Russia.
Department of Chemistry Lomonosov, Moscow State University, 1-3 Leninskie Gory, Moscow 119991, Russia.
Polymers (Basel). 2023 Jun 29;15(13):2894. doi: 10.3390/polym15132894.
Novel ternary hybrid polyphenoxazine (PPOA)-derived nanocomposites involving Co-Fe particles and single-walled (SWCNTs) or multi-walled (MWCNTs) carbon nanotubes were prepared and investigated. An efficient one-pot method employing infrared (IR) heating enabled the formation of Co-Fe/CNT/PPOA nanocomposites. During this, the dehydrogenation of phenoxazine (POA) units led to the simultaneous reduction of metals by released hydrogen, yielding bimetallic Co-Fe particles with a size range from the nanoscale (5-30 nm) to the microscale (400-1400 nm). The synthesized Co-Fe/CNT/PPOA nanomaterials exhibited impressive thermal stability, demonstrating a half-weight loss at 640 °C and 563 °C in air for Co-Fe/SWCNT/PPOA and Co-Fe/MWCNT/PPOA, respectively. Although a slightly broader range of saturation magnetization values was obtained using MWCNTs, it was found that the type of carbon nanotube, whether an SWCNT (22.14-41.82 emu/g) or an MWCNT (20.93-44.33 emu/g), did not considerably affect the magnetic characteristics of the resulting nanomaterial. By contrast, saturation magnetization escalated with an increasing concentration of both cobalt and iron. These nanocomposites demonstrated a weak dependence of electrical conductivity on frequency. It is shown that the conductivity value for hybrid nanocomposites is higher compared to single-polymer materials and becomes higher with increasing CNT content.
制备并研究了包含钴铁颗粒和单壁（SWCNTs）或多壁（MWCNTs）碳纳米管的新型三元杂化聚酚恶嗪（PPOA）衍生纳米复合材料。采用红外（IR）加热的高效一锅法能够形成钴铁/碳纳米管/PPOA纳米复合材料。在此过程中，酚恶嗪（POA）单元的脱氢导致释放出的氢气同时还原金属，生成尺寸范围从纳米级（5 - 30纳米）到微米级（400 - 1400纳米）的双金属钴铁颗粒。合成的钴铁/碳纳米管/PPOA纳米材料表现出令人印象深刻的热稳定性，在空气中，钴铁/SWCNT/PPOA和钴铁/MWCNT/PPOA分别在640℃和563℃出现半失重。尽管使用MWCNTs获得的饱和磁化强度值范围稍宽，但发现碳纳米管的类型，无论是SWCNT（22.14 - 41.82 emu/g）还是MWCNT（20.93 - 44.33 emu/g），对所得纳米材料的磁特性影响不大。相比之下，饱和磁化强度随着钴和铁浓度的增加而升高。这些纳米复合材料的电导率对频率的依赖性较弱。结果表明，与单一聚合物材料相比，杂化纳米复合材料的电导率值更高，并且随着碳纳米管含量的增加而升高。
