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论文类型： 期刊论文

发表时间： 2011-12-01

发表刊物： JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE

收录刊物： Scopus、SCIE、EI

卷号： 8

期号： 12,SI

页面范围： 2492-2497

ISSN号： 1546-1955

关键字： Graphene; Adsorption; pi - pi Stacking; Noncovalent Interaction

摘要： First-Principles calculations were performed on the noncovalent interaction between graphene and aromatic heterocyclic molecules (thiophene, benzene, benzothiophene, dibenzothiophene, and pyridine) in the parallel and vertical orientations. The most stable adsorption configurations prefer pi - pi stacking way. The aromatic molecules are charge acceptors for graphenes. The polarity and the size of pi-conjugation can alter the magnitude of interactions between small aromatic molecules and graphene. According to the Hunter-Sanders model, we evaluate the relative contributions of pi-sigma attraction and the pi - pi repulsion. According to the adsorption energy and the differential electron density of the systems, it is found that the pi-sigma attraction energy accounts for the most portion of the adsorption energy.