Room-temperature ferromagnetism induced by boundary defects in graphene oxide nanoplatelets*

Graphene oxide nanoplatelets from bamboo pyroligneous acid (GO-BPA) show room-temperature ferromagnetism, by using the double thermal decomposition (DTD) method at different carbonization temperatures from 673 to 973 K. The GO-BPA samples were characterized by using Raman, FTIR, XRD, XPS, HR-TEM, I-V curves, MFM and VSM techniques. Magnetic measurenets suggest that increased carbonization temperature increases graphite conversion, boundary defects, desorption of some organic compounds, phonon response and magnetization saturation, respectively. Room-temperature ferromagnetic behavior was correlated with the variation of the boundary defect density.