IODINE INCORPORATION INTO POLYMERIC FILMS INVESTIGATED BY ANGLE-RESOLVED XPS

被引:10
作者
BASCHENKO, OA [1 ]
TYZYKHOV, MA [1 ]
NEFEDOV, VI [1 ]
机构
[1] UNIV LA SAPIENZA,DEPT CHEM,I-00185 ROME,ITALY
关键词
D O I
10.1016/0368-2048(91)85003-C
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Distribution of elements into subsurface layers (up to 120 angstrom thickness) of polyphenylacetylene (PPA) films doped with I2 vapour has been determined by X-ray photoelectron spectroscopy data using a unique numerical technique. Concentration of incorporated iodine has been shown to increase with exposure time; the concentration profiles are dome-shaped and iodine does not penetrate much into the bulk of PPA films, even when exposed to I2 vapours for 1 h. The depth of the layer corresponding to maximum iodine concentration is directly proportional to the iodine exposure time. The non-homogeneous distribution of the doping species in the polymer may be responsible for the low conductivity observed for heterogeneously doped PPA films.
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页码:203 / 209
页数:7
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