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Open AccessArticle

Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping

1
Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland
2
School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
3
NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznań, Poland
4
Center of Advanced Technology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
5
Department of Chemical Research Support, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(5), 957; https://doi.org/10.3390/nano10050957
Received: 11 April 2020 / Revised: 4 May 2020 / Accepted: 5 May 2020 / Published: 18 May 2020
(This article belongs to the Special Issue Nanocarbon Based Materials)
The arrangement of two-dimensional graphene oxide sheets has been shown to influence physico-chemical properties of the final bulk structures. In particular, various graphene oxide microfibers remain of high interest in electronic applications due to their wire-like thin shapes and the ease of hydrothermal fabrication. In this research, we induced the internal ordering of graphene oxide flakes during typical hydrothermal fabrication via doping with Calcium ions (~6 wt.%) from the capillaries. The Ca2+ ions allowed for better graphene oxide flake connections formation during the hydrogelation and further modified the magnetic and electric properties of structures compared to previously studied aerogels. Moreover, we observed the unique pseudo-porous fiber structure and flakes connections perpendicular to the long fiber axis. Pulsed electron paramagnetic resonance (EPR) and conductivity measurements confirmed the denser flake ordering compared to previously studied aerogels. These studies ultimately suggest that doping graphene oxide with Ca2+ (or other) ions during hydrothermal methods could be used to better control the internal architecture and thus tune the properties of the formed structures. View Full-Text
Keywords: graphene oxide fibers; hydrothermal synthesis; reduced graphene oxide; electron paramagnetic resonance; electron spin relaxation graphene oxide fibers; hydrothermal synthesis; reduced graphene oxide; electron paramagnetic resonance; electron spin relaxation
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MDPI and ACS Style

Tadyszak, K.; Wychowaniec, J.K.; Załęski, K.; Coy, E.; Majchrzycki, Ł.; Carmieli, R. Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping. Nanomaterials 2020, 10, 957. https://doi.org/10.3390/nano10050957

AMA Style

Tadyszak K, Wychowaniec JK, Załęski K, Coy E, Majchrzycki Ł, Carmieli R. Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping. Nanomaterials. 2020; 10(5):957. https://doi.org/10.3390/nano10050957

Chicago/Turabian Style

Tadyszak, Krzysztof; Wychowaniec, Jacek K.; Załęski, Karol; Coy, Emerson; Majchrzycki, Łukasz; Carmieli, Raanan. 2020. "Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping" Nanomaterials 10, no. 5: 957. https://doi.org/10.3390/nano10050957

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