Molecular-scale investigations of semi-insulating polymer single crystals by noncontact atomic force microscopy

摘要

Surfaces of polymerized 2,4-hexadiyne-l,6 bis(p-toluene-sulphonate) (poly-PTS) single crystals were investigated on a molecular scale by noncontact atomic force microscopy (NC-AFM). Molecularly resolved images of the surface structures, the energy dissipation and the surface potential (SP) distribution were successfully obtained. The possible origins of energy dissipation are discussed in terms of the relationship with the molecular fluctuation. Furthermore, to ascertain the origin of the SP distribution, the obtained SP image was compared with the calculated local charges on the individual atoms forming the molecule.