“…The CNTs [21,22], nitrogen-doped CNTs [23], boron-doped CNTs [24], CNFs [25][26][27], consolidate of CNTs and CNFs [28][29][30][31], GO [32][33][34], graphene [35], GO aerogels [36,37], GO quantum dots [38], carbon nanofibers [39], glass-like carbon [40], detonation diamonds and NDs [12], graphitepolystyrene composite [41], carbon films [42], natural coals [43], oxidized coals [44], carbon blacks [45], different carbon composites [46] and others [18] were investigated using the EPR. EPR signals contain information about possible paramagnetic centers of CNMs, their nature and the possible influence of oxygen-containing groups [28,[47][48][49]. The temperature dependencies of the intensity of the EPR spectra are used to identify the source of the observed magnetism [34].…”