Modification of surface chemistry by lattice Sn doping in BiFeO3 nanofibers M. Sobhan, Q. Xu, J. Zhao, A. Franklin, Y. Hu, J. S. Tse and P. Wu EPL, 111 1 (2015) 18005 Published online: 29 July 2015 DOI: 10.1209/0295-5075/111/18005