  Here, the possibility of the existence of nitro-graphene derivatives with
undisturbed graphene backbone is considered. Based on the first-principles
calculation, it is shown that while NO$_2$ is unable to form a covalent bond
with bare graphene, it becomes possible in some structures of graphane,
fluorographene, and graphene oxide. This paper presents, among others, an
analysis of the surrounding influence on the C-NO$_2$ bond strength. The author
believes, that potential prospects of these materials and discussion about
possible synthesizing routes may help further research on graphene-based
materials.
