An ab initio study on gas sensing properties of graphene and Si-doped graphene Y. Zou, F. Li, Z. H. Zhu, M. W. Zhao, X. G. Xu and X. Y. Su Eur. Phys. J. B, 81 4 (2011) 475-479 Published online: 22 June 2011 DOI: 10.1140/epjb/e2011-20225-8