Graphene is the thinnest material known. It consists of just one atomic layer of carbon atoms arranged in a honeycomb lattice and can be regarded as perfect two-dimensional system. Several layers of graphene stacked up in a sandwich form the well-known graphite. Until the year 2004 graphene was considered to be unstable when it was finally obtained, stabilized on Silicon oxide substrates and characterized by Andre Geim and Konstantin Novoselov at Manchester University / UK. For this achievement Geim and Novoselov have received the Nobel Prize in Physics 2010 [2].