Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

Abstract

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.

A Macroscopic Interpretation of the Correlation between Electrical Percolation and Mechanical Properties of Poly-(Ethylene Vinyl Acetate)/Zn Composites

“…Composite materials consisting of an isolator phase filled with a conductive powder are of special interest and have a wide range of particular uses [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. When the filler content increases, the particles form inner structural clusters in the polymeric matrix.…”

Graphene oxide and its derivatives as potential Ovchinnikov ferromagnets

“…This led to an exclusive search for the source of unpaired spins in carbon based systems [10]. Several factors responsible for the creation of unpaired spins in such systems reported are vacancies or nanoholes [11][12][13], topological defects [14][15][16], Stone-Wales defects [17], pentagon-octagon pairs [18], temperature dependence [19], edge states [20,21], adatoms [22][23][24][25], disordered and functionalized regions [26][27][28], individual oxygen functional groups (OFGs) dependent magnetism [16,27,[29][30][31][32][33][34][35][36][37] etc. Interesting applications of magnetic nanoparticles decorated composite of carbon based systems have been demonstrated recently [38].…”

Намагниченность Иглообразного Графена, Внедренного В Матрицу Полистирола

“…1) в том же температурном интервале наблюдаются джозефсоновские вольт-амперные характеристики, что отличает сверхпроводник от нормального металла [6,7]; 2) исследование электронного спинового резонанса в композите с гистерезисной петлей намагниченности показало, что значение g-фактора не зависело от температуры и находилось в диапазоне, характерном для свободного электрона углерода (g = 2.0022−2.0035), такое поведение g-фактора исключает возникновение внутреннего магнитного поля в композите [8]; 3) при введении магнитной примеси в полистирол у композита петля гистерезиса обусловлена исключительно магнитной примесью полистирола, а гистерезисная петля, связанная с графеном, не наблюдается в отличие от гистерезиса композита, у которого в полистироле отсутствовала магнитная примесь [9].…”