We report a research study on reduced graphene oxide conducted with electron paramagnetic resonance and impedance spectroscopy techniques. Coupling of the two experimental methods allowed us to obtain detailed information on the charge carrier transport in the graphene material and make an attempt at explaining the peculiar behaviour of para- and ferromagnetic properties of the studied system. Two scattering processes characterized by different dynamics were found. An ambipolar-like character of the charge transport was observed with transition between holes and electrons driven by the bias voltage, temperature, and adsorption. Electron paramagnetic resonance spectra showed a typical signal from localized centers as well as weak ferromagnetism. The latter correlates with the change of carriers' polarity. This indicates that ferromagnetic coupling between the localized states in graphene is related to the type of charge carriers. Such behavior points to the similarity of reduced graphene oxide to the dilute (ferro)magnetic semiconductors.
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22 October 2018
Research Article|
October 26 2018
Behaviour of charge carriers in thermally reduced graphene oxide: Magnetism and ambipolar transport
Mateusz Kempiński
;
Mateusz Kempiński
a)
1
Faculty of Physics, Adam Mickiewicz University
, Umultowska 85, 61-614 Poznań, Poland
2
NanoBioMedical Centre, Adam Mickiewicz University
, Umultowska 85, 61-614 Poznań, Poland
a)Author to whom correspondence should be addressed: [email protected]
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Szymon Łoś;
Szymon Łoś
3
Institute of Molecular Physics, Polish Academy of Sciences
, Smoluchowskiego 17, 60-179 Poznań, Poland
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Patryk Florczak;
Patryk Florczak
2
NanoBioMedical Centre, Adam Mickiewicz University
, Umultowska 85, 61-614 Poznań, Poland
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Wojciech Kempiński
Wojciech Kempiński
3
Institute of Molecular Physics, Polish Academy of Sciences
, Smoluchowskiego 17, 60-179 Poznań, Poland
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 113, 172408 (2018)
Article history
Received:
July 05 2018
Accepted:
October 09 2018
Citation
Mateusz Kempiński, Szymon Łoś, Patryk Florczak, Wojciech Kempiński; Behaviour of charge carriers in thermally reduced graphene oxide: Magnetism and ambipolar transport. Appl. Phys. Lett. 22 October 2018; 113 (17): 172408. https://doi.org/10.1063/1.5047127
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