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Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping
Krzysztof Tadyszak1, Jacek K Wychowaniec2,3, Karol Załęski3
1Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland.
Nanomaterials (Basel, Switzerland)
|May 24, 2020
Summary
Doping graphene oxide with calcium ions during fabrication improves microfiber structure and properties. This method enhances flake connections and ordering for advanced electronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Graphene oxide (GO) sheet arrangement impacts bulk material properties.
- GO microfibers are attractive for electronics due to their morphology and facile fabrication.
- Controlling GO internal architecture is key to tuning material performance.
Purpose of the Study:
- To investigate the effect of calcium ion (Ca2+) doping on the internal structure and properties of hydrothermally fabricated graphene oxide microfibers.
- To explore Ca2+ induced changes in flake connectivity and ordering.
- To assess the impact on magnetic and electrical characteristics.
Main Methods:
- Hydrothermal fabrication of graphene oxide microfibers.
- Doping with calcium ions (~6 wt.%) sourced from capillary water.
- Characterization using pulsed electron paramagnetic resonance (EPR) and conductivity measurements.
Main Results:
- Ca2+ doping induced better graphene oxide flake connections during hydrogelation.
- Observed unique pseudo-porous fiber structure with perpendicular flake connections.
- Confirmed denser flake ordering compared to non-doped aerogels via EPR and conductivity.
- Modified magnetic and electrical properties of the resulting structures.
Conclusions:
- Calcium ion doping offers a method to control the internal architecture of graphene oxide microfibers during hydrothermal synthesis.
- This control allows for tuning of magnetic and electrical properties.
- The findings suggest a broader applicability of ion doping for advanced material design.
