XPS studies of the doping mechanism of polyacetylene (I) revealed that the charge per carbon atom in the metallic region was closely related to the oxidation potential for both electron acceptors and oxidative protonic-type dopants. For doping with strong oxidative protonic acids such as HClO4 and H2SO4, the charge transfer from I chain to the dopant mol. and simultaneous reduction of dopant mol. to a lower valence state were observed by XPS. For nonoxidative or weak oxidative protonic acid dopants, the max. doping level and the elec. conductivity achieved were much lower than those in the case of charge-transfer process.

Key words: OXIDATION, POLYETHYLENE, DOPE, X-RAY PHOTOELECTRON SPECTROMETRY, ELECTRIC POTENTIAL, CHARGE TRANSFER, NSFC