SnO2 thin films used as ammonia sensing layers at room temperature A. Gaddari, M. Amjoud, F. Berger, J.B. Sanchez, M. Lahcini, B. Rhouta, D. Mezzane and C. Mavon MATEC Web of Conferences, 5 (2013) 04010 Published online: 09 September 2013 DOI: 10.1051/matecconf/20130504010