Wang, J. Z., Liu, P., Huang, Y. S., Jiang, J. Z., Han, S., Wu, D., et al. (2014). An ionic self-assembly approach towards sandwich-like graphene/SnO2/graphene nanosheets for enhanced lithium storage. RSC Advances, 4(101), 57869-57874. doi:10.1039/c4ra10573g.