Condensation coefficients and initial stages of growth for noble metals deposited onto chemically different polymer surfaces
- 作者：Zaporojtchenko ; V. ; Behnke ; K. ; Thran ; A. ; Strunskus ; T. ; Faupel ; F.
- 关键词：Condensation coefficient ; Nucleation ; Cluster ; XPS ; 82.65.&minus ; i ; 68.35.Fx ; 68.35.Bs ; PL ; MI ; PG ; EE
- 刊名：Applied Surface Science
- 出版年：1999
- 期刊代码：6_01694332
- 类别：ms
- 出版时间：April, 1999
- 卷：144-145
- 期：Complete
- 页码：355-359
- 文件大小：896 K
摘要
The initial stages of growth of noble metals deposited onto untreated as well as Ar+ beam-treated polymer surfaces were investigated by means of X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and radiotracer methods. Condensation coefficients C of the metals on the polymer surfaces were determined by comparison of the XPS signals of the metals with the nominal thicknesses measured by a quartz microbalance during deposition. These measurements were combined with radiotracer measurements, which allow to determine C independently with high accuracy and sensitivity. C was found to depend strongly on the chemical composition of the polymer surface, e.g., at room temperature, C varies between 0.95 for PMDA-ODA polyimide and 0.002 for Teflon AF. By ion beam treatment of the latter, C was raised considerably. During nucleation of the metal on the polymer surface, C increases strongly with metal coverage. C also depends on the deposition rate of the metal and decreases strongly at elevated temperatures.