We report the observations of electronic properties of graphene oxide and reduced graphene oxide, performed with electron paramagnetic resonance technique in a broad temperature range. Both materials were examined in pure form and saturated with air, helium, and heavy water molecules. We show that spin localization strongly depends on the type and amount of molecules adsorbed at the graphene layer edges (and possible in-plane defects). Physical and chemical states of edges play crucial role in electrical transport within graphene-based materials, with hopping as the leading mechanism of charge carrier transport. Presented results are a good basis to understand the electronic properties of other carbon structures made of graphene-like building blocks. Most active carbons show some degree of functionalization and are known of having good adsorptive properties; thus, controlling both phenomena is important for many applications. Sample treatment with temperature, vacuum, and various adsorbents allowed for the observation of a possible metal-insulator transition and sorption pumping effects. The influence of adsorption on the localization phenomena in graphene would be very important if to consider the graphene-based material as possible candidates for the future spintronics that works in ambient conditions.
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21 August 2017
Research Article|
August 25 2017
The impact of adsorption on the localization of spins in graphene oxide and reduced graphene oxide, observed with electron paramagnetic resonance
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
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Patryk Florczak;
Patryk Florczak
2
NanoBioMedical Centre, Adam Mickiewicz University
, Umultowska 85, 61-614 Poznań, Poland
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Stefan Jurga;
Stefan Jurga
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
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Małgorzata Śliwińska-Bartkowiak;
Małgorzata Śliwińska-Bartkowiak
1
Faculty of Physics, 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. 111, 084102 (2017)
Article history
Received:
July 19 2017
Accepted:
August 18 2017
Citation
Mateusz Kempiński, Patryk Florczak, Stefan Jurga, Małgorzata Śliwińska-Bartkowiak, Wojciech Kempiński; The impact of adsorption on the localization of spins in graphene oxide and reduced graphene oxide, observed with electron paramagnetic resonance. Appl. Phys. Lett. 21 August 2017; 111 (8): 084102. https://doi.org/10.1063/1.4996914
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