Molecular adsorption on graphene

摘要: Current studies addressing the engineering of charge carrier concentration and electronic band gap in epitaxial graphene using molecular adsorbates are reviewed. The focus here is on interactions between surface adsorbed molecules, including small gas molecules (H(2)O, H(2), O(2), CO, NO(2), NO, NH(3)), aromatic, non-aromatic (F4-TCNQ, PTCDA, TPA, Na-NH(2), An-CH(3), An-Br, Poly (ethylene imine) (PEI), diazonium salts), various biomolecules such as peptides, DNA fragments, other derivatives. This followed by a discussion graphene-based sensor concepts. In reviewing effects adsorption graphene, it evident that strong manipulation graphene's structure, p- n-doping, not only possible with adsorbates, but this approach appears to be superior compared these exploiting edge effects, local defects, or strain. However, sensors, albeit feasible because huge adsorbate-induced variations relative conductivity possible, generally suffer from lack chemical selectivity.