TY - JOUR
T1 - Pure electric and magnetic fields applied to reduced graphene oxide for defect repair and oxygen removal
AU - Miyata, Takeshi
AU - Gohda, Syun
AU - Fujii, Takashi
AU - Ono, Hironobu
AU - Itoh, Hibiki
AU - Nishina, Yuta
AU - Kashimura, Keiichiro
N1 - Funding Information:
K. Kashimura and T. Miyata are very grateful to S. Hashimoto, T. Namioka, and H. Takaya for helpful advice and fruitful discussions. This work was supported by the Research Institute for Sustainable Humanosphere, Kyoto University (project: Adam, Mission Research) and by Chubu University (project: Sokoken). The sponsors had no involvement in the study design; in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the article for publication.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - The rapid repair of graphene oxide (GO) was demonstrated using a microwave cavity resonator that separates pure electric and magnetic fields from microwaves. Reduced graphene oxide (rGO), a high-quality graphene-like material, was obtained using our method. Raman spectroscopy of rGO after microwave treatment revealed that the D band intensity decreased as the temperature increased, while the G and G′ band intensities increased with increasing temperature. Furthermore, the cavity resonator provided better defect repair and oxygen removal from GO than conventional heating, and the microwave magnetic field yielded better quality rGO than the microwave electric field. Microwave heating removed surface impurities and repaired defects in GO more effectively than conventional heating, while suppressing graphitisation. These findings provide guidelines for the microwave-assisted reduction of GO for the fast and large-scale production of graphene.
AB - The rapid repair of graphene oxide (GO) was demonstrated using a microwave cavity resonator that separates pure electric and magnetic fields from microwaves. Reduced graphene oxide (rGO), a high-quality graphene-like material, was obtained using our method. Raman spectroscopy of rGO after microwave treatment revealed that the D band intensity decreased as the temperature increased, while the G and G′ band intensities increased with increasing temperature. Furthermore, the cavity resonator provided better defect repair and oxygen removal from GO than conventional heating, and the microwave magnetic field yielded better quality rGO than the microwave electric field. Microwave heating removed surface impurities and repaired defects in GO more effectively than conventional heating, while suppressing graphitisation. These findings provide guidelines for the microwave-assisted reduction of GO for the fast and large-scale production of graphene.
KW - Defect repair
KW - Microwave heating
KW - Pure electrical field
KW - Pure magnetic field
KW - Reduced graphene oxide
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U2 - 10.1016/j.carbon.2020.08.044
DO - 10.1016/j.carbon.2020.08.044
M3 - Article
AN - SCOPUS:85090589139
VL - 171
SP - 10
EP - 15
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -