Defect and Magnetic Properties of Reduced Graphene Oxide Prepared from Old Coconut Shell

3rd International Conference on Functional Materials Science 2016

Kurniasari^1 ; Maulana, A.^1 ; Nugraheni, A.Y.^1 ; Jayanti, D.N.^1 ; Mustofa, S.^2 ; Baqiya, M.A.^1 ; Darminto^1,3

Advanced Materials Research Group, Department of Physics, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya

60111, Indonesia^1

Center for Science and Technology of Advanced Materials, National Energy Agency of Indonesia, Kawasan Puspiptek Serpong, Tangerang

15134, Indonesia^2

Center of Excellence in Automotive Control and System, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya

60111, Indonesia^3

关键词: Heating temperatures;    Induced magnetism;    Magnetic property measurements;    Mechanical exfoliation;    Reduced graphene oxides;    Reduced graphene oxides (RGO);    Varying temperature;    Vibrating sample magnetometer;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/196/1/012021/pdf
DOI  :  10.1088/1757-899X/196/1/012021

来源: IOP

【 摘 要 】

Defect state may be created on the grafitic bonding of carbon atoms as the dangling bonds of the reduced graphene oxide (rGO) compound. In this study, the rGO sample has been prepared by burning the coconut shell in air. The resulted burnt samples were then heated at varying temperatures (400, 700, and 1000°C) for 5 hours in air. Further, a mechanical exfoliation process using ultrasonic vibrator was added to the samples for 5 hours. Characterization using Raman spectroscopy exhibited that the intensity ratio of defect (ID) and graphene (IG) increases, implying the increase of defect number, with respect to the increasing heating temperature. According to the magnetic property measurement using vibrating sample magnetometer (VSM), it is shown that the magnetization enhances with incerasing number of defects, featuring an occurrence of defect-induced magnetism in rGO.