Copper nanocones grown in polymer ion-track membranes as field emitters P. Serbun, F. Jordan, A. Navitski, G. Müller, I. Alber, M.E. Toimil-Molares and C. Trautmann Eur. Phys. J. Appl. Phys., 58 1 (2012) 10402 Published online: 23 March 2012 DOI: 10.1051/epjap/2012110473