TY - GEN
T1 - Comparative study on magnetism of reduced graphene oxide (Rgo) prepared from coconut shells and the commercial product
AU - Asih, Retno
AU - Yutomo, Erik Bhekti
AU - Ristiani, Deril
AU - Baqiya, Malik Anjelh
AU - Kawamata, Takayuki
AU - Kato, Masatsune
AU - Watanabe, Isao
AU - Koike, Yoji
AU - Darminto,
N1 - Publisher Copyright:
© 2019 Trans Tech Publications Ltd, Switzerland.
PY - 2019
Y1 - 2019
N2 - 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 (MS) 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 MS is 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.
AB - 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 (MS) 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 MS is 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.
KW - Coconut shells
KW - Defect
KW - Magnetic hysteresis
KW - Magnetization
KW - Reduced graphene oxide
UR - http://www.scopus.com/inward/record.url?scp=85071909400&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.966.290
DO - 10.4028/www.scientific.net/MSF.966.290
M3 - Conference contribution
AN - SCOPUS:85071909400
SN - 9783035714968
T3 - Materials Science Forum
SP - 290
EP - 295
BT - Functional Properties of Modern Materials II
A2 - Darminto, null
A2 - Kurniawan, Budhy
A2 - Risdiana, null
A2 - Watanabe, Isao
A2 - Nugroho, Agustinus Agung
PB - Trans Tech Publications Ltd
T2 - 4th International Conference on Functional Materials Science, ICFMS 2018
Y2 - 13 November 2018 through 15 November 2018
ER -