Ionov Alexander N, Volkov Mikhail P, Nikolaeva Marianna N, Smyslov Ruslan Y, Bugrov Alexander N
Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia.
Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy pr-t 31, 199004 St. Petersburg, Russia.
Materials (Basel). 2021 May 12;14(10):2519. doi: 10.3390/ma14102519.
This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. The magnetization of the composites under investigation and their components was measured using a vibrating-sample magnetometer. It has been shown that the UV-reduction process leads to the formation of many submicron holes distributed inside rGO flakes, which can create edge defects, causing possibly magnetic order in the graphite samples under investigation on the mesoscopic level. This article provides an alternative explanation for the ferromagnetic hysteresis loop in UV-rGO on the base of superconductivity type-II.
这项工作展示了我们对多层紫外线还原氧化石墨烯（UV-rGO）、聚合物基体（聚苯乙烯）以及基于它们的共轭复合材料的磁化研究结果。通过X射线衍射、扫描电子显微镜（SEM）以及核磁共振（NMR）、红外（IR）和拉曼光谱等方法研究了本工作中合成的复合材料的介观结构。使用振动样品磁强计测量了所研究的复合材料及其组分的磁化强度。结果表明，紫外线还原过程导致在rGO薄片内部形成许多亚微米级的孔洞，这会产生边缘缺陷，可能在介观层面上使所研究的石墨样品产生磁有序。本文基于II型超导性为UV-rGO中的铁磁滞回线提供了另一种解释。
