Comparative Study on Magnetism of Reduced Graphene Oxide (rGO) Prepared from Coconut Shells and the Commercial Product

Retno Asih; Erik Bhekti Yutomo; Deril Ristiani; Malik Anjelh Baqiya; Takayuki Kawamata; Masatsune Kato; Isao Watanabe; Yoji Koike; Darminto Darminto

doi:10.4028/www.scientific.net/MSF.966.290

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HomeMaterials Science ForumMaterials Science Forum Vol. 966Comparative Study on Magnetism of Reduced Graphene...

Comparative Study on Magnetism of Reduced Graphene Oxide (rGO) Prepared from Coconut Shells and the Commercial Product

Abstract:

Magnetism of reduced graphene oxide/rGO prepared by a green synthesis method from coconut shells (rGO-s) and the commercial product (rGO-c, ®Graphenea) have been investigated. Similar magnetic feature of a weak ferromagnetism concomitant with diamagnetic nature was observed in both samples. At 300 K, the saturation magnetization (M_S) of rGO-s is approximately 14×10^-3 emu/g, which is about 3 times of that observed in rGO-c (~5×10^-3 emu/g). The noticeable difference in the M_Sis suggested due to the different concentration of oxygen-functional groups and other defects presented in the rGO sheets. The samples have similar structure and contains similar functional groups, yet rGO-s contains higher concentration of oxygen-functional groups and defects than rGO-c. A paramagnetic behavior was also indicated at low temperature. This study supports an indication of the defect-induced-magnetism in rGO and confirms that various magnetic features, such as ferromagnetic, diamagnetic and paramagnetic, can coexist in rGO.

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Materials Science Forum (Volume 966)

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290-295

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.966.290

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August 2019

Authors:

Retno Asih, Erik Bhekti Yutomo, Deril Ristiani, Malik Anjelh Baqiya, Takayuki Kawamata, Masatsune Kato, Isao Watanabe, Yoji Koike, Darminto Darminto*

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Coconut Shells, Defect, Magnetic Hysteresis, Magnetization, Reduced Graphene Oxide (rGO)

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