Details

Autor(en) / Beteiligte

• Tadyszak, Krzysztof
• Chybczyńska, Katarzyna
• Ławniczak, Paweł
• Zalewska, Alina
• Cieniek, Bogumił
• Gonet, Michał
• Murias, Marek

Titel

Magnetic and electric properties of partially reduced graphene oxide aerogels

Ist Teil von

• Journal of magnetism and magnetic materials, 2019-12, Vol.492, p.165656, Article 165656

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Electrical and magnetic studies on partially reduced graphene oxide.•Multiple magnetic interactions of edge states, oxygen rich groups and lattice defects.•Variable range hopping conductivity model σ~Ae-∆E/T0.5.•Electron spin lattice relaxation – TLS model AT+BCosh∆EkT. Complex magnetic behavior of pristine, partially reduced graphene oxide aerogel with C/O ratio of 2.35 (EDS) with full analysis of oxygen rich groups attached to the surface is reported. Purity of the system was confirmed by three techniques: elemental analysis, EDS, EPR at 4.2 K none of them detected traces of transition metal ions, especially iron and manganese. Computer tomography reviled the inside foam structure, showing different stacking inside and at the surface, as well as some structural defects. The foams morphology was confirmed by SEM. Electric measurements show linear voltage current relationship and temperature dependences which could be described in the framework of variable range hopping model. Magnetic susceptibility measurements exhibit very weak ferromagnetic behavior modified by antiferromagnetic interactions and paramagnetism. EPR study confirms two component paramagnetism of Curie and Pauli type.