Two-dimensional carbon nanomaterials such as graphene, graphene oxide (GO), and reduced graphene oxide were intensively used for several applications. Graphene oxide was used for rare-earth metal adsorption . It can be modified with thymine for selective detection of toxic heavy metals such as mercury (Hg(II)) . The layer structure of GO enables the intercalation of an organic matrix such as sinapinic acid . GO can be modified with SiO2