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The electronic structure of poly(p-xylylene)

✍ Scribed by C.B. Duke; R.W. Bigelow; A. Dilks; A. Paton; W.R. Salaneck; H.R. Thomas

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
422 KB
Volume
83
Category
Article
ISSN
0009-2614

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✦ Synopsis

The electronic structure of poiy(&xylylene) is of particular interest in the study of conducthrg Polymeric materials because it lies at the border between materials in which molecular cation states aredelocalized over several polymeric repeat units (e-g. polyethyiene [l] , polyacetylene [2,3] and poly@phenylene) [3]) and those in which these states are localized-on individual molecular moieties along the polymer backbone (e.g. polystyrene and poly(2-vinylpyridine) [4,5 1). In this letter we report a study of valence electron photoemission from poly@-xylylene) which reveals that the photoinduced low-energy rr-electron radical cation states are localized on the individual phenyl moieties in the poly@xylylene) backbone. Thereforethe ele+ronic'structure and transport, propertiedof polyf$-xylyle&) r&e more closely analogous to those of polystyrene [4>] than to those of extended ir-electron'systems like poly@phenylene), poly(p-phenyleue oxide), and poly@phenylene sulfide) 131.

He(B) (40.8 ev) condensed phase photoemission spectra of p-xylene and poly@-xylylene) were recorded on an AEI ES2OOB photoelectron spectrometer (normal operating pressure p Q 10-S Torr) equipped with a Vacuum Generators model 22-101 ultraviolet source as described previously [4 ] . Fihn thicknesses of samples prepared in the high vacuum of the spectrometer were estimated by monitoring the underlying substrate by X-ray photoelectron spectroscopy (XPS), Films of Matheson, Colemanand Bell chromatoquality p-xylene, purged of 02 by freeze-pump&thaw cycling, were pre-

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