Temperature- and diameter-dependent electrical conductivity of nitrogen doped ZnO nanowires Shu-Long Li, Xiao-Xia Yu, Ya-Lin Li, Pei Gong, Ya-Hui Jia, Xiao-Yong Fang and Mao-Sheng Cao Eur. Phys. J. B, 92 7 (2019) 155 Published online: 10 July 2019 DOI: 10.1140/epjb/e2019-100208-3