Effect of defects controlled by preparation condition and heat treatment on the ferromagnetic properties of few-layer graphene.

ABSTRACT: Magnetism in graphene has stimulated extensive studies to search for novel metal-free magnetic device. In this paper, we use a synthesis method far from equilibrium state named self-propagating high temperature synthesis (SHS) to produce few-layer graphene with different defect contents and then use a heat treatment process (vacuum-annealing and air-cooling) to further control the defects in graphene. We find that the type and content of defects in graphene can be controlled by adjusting the mole ratio of reactants (Mg: CaCO₃) for SHS reaction and the temperature of the subsequent heat treatment. The deviation of the ratio of reactants from stoichiometric ratio benefits the production of graphene with higher concentration of defects. It is indicated that the temperature of the h

SUBMITTER: Miao Q 

PROVIDER: S-EPMC5517599 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature