Effect of nanostructured morphologies of SnO2 on field emission properties L.J. Wang, Ch.X. Wu, J.Y. Lin, Y. Ye, Z.X. Yang and T.L. Guo Eur. Phys. J. Appl. Phys., 58 1 (2012) 10401 Published online: 23 March 2012 DOI: 10.1051/epjap/2012110389