P. W. Gong, Q. Zhao, D. J. Dai, S. M. Zhang, Z. Z. Tian, L. Sun, J. S. Ren, Z. Liu*. Functionalized ultrasmall fluorinated graphene with high NIR absorbance for controlled delivery of mixed anticancer drugs. Chemistry- A European Journal, 2017, DOI: 10.1002/chem.201702917.