Observation of Cross Sections of Plasma-Polymerized Films of Benzene and Naphthalene by Electron Spectroscopic Imaging

Abstract
Plasma-polymerized films of benzene and naphthalene were prepared by direct current (D.C.) glow discharge. The chemical structures of the films were characterized by IR and Raman spectroscopy, electron energy loss spectroscopy (EELS), and electron spectroscopic imaging (ESI). With increasing D.C. voltage, the hydrogen-free carbon films consisting of sp2 bonded carbon tended to change to sp3 bonded carbon. Successive plasma-polymerization with different D.C. voltages for benzene and naphthalene on poly(ethylene terephthalate) (PET) film yielded double-layer films consisting of sp2 and sp3 bonded carbons, respectively. Observation of cross section of the film by ESI yielded clear images of the heterostructure.