Adsorption of surfactants in porous silicon films

被引：32

作者：

Bjorklund, RB

Zangooie, S

Arwin, H

机构：

[1] Department of Physics, Linköping University

来源：

LANGMUIR | 1997年 / 13卷 / 06期

关键词：

D O I：

10.1021/la960659b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surfactant adsorption in porous silicon films formed by anodic oxidation of bulk p-type silicon in HF solution was studied by spectroscopic ellipsometry. The cationic surfactant cetyltrimethylammonium bromide reversibly adsorbed in the films from aqueous solutions. No adsorption of sodium dodecyl sulfate was observed. Modification of the surfaces by addition of aluminum nitrate from ethanol solutions and titanium(IV) chloride from the gas phase, followed by thermal decomposition, altered the surface propel ties and surfactant adsorption behavior. A simple two-layer optical model was used to obtain the effective refractive indices for the porous films in different ambient media. Spectra calculated from the model agreed well with the experimental observations.

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页码：1440 / 1445

页数：6

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