کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5369110 | 1388420 | 2006 | 17 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface morphology of metal films deposited on mica at various temperatures observed by atomic force microscopy Surface morphology of metal films deposited on mica at various temperatures observed by atomic force microscopy](/preview/png/5369110.png)
Thin films of eight metals with a thickness of 150 nm were deposited on mica substrates by thermal evaporation at various temperatures in a high vacuum. The surface morphology of the metal films was observed by atomic force microscopy (AFM) and the images were characterized quantitatively by a roughness analysis and a bearing analysis (surface height analysis). The films of Au, Ag, Cu, and Al with the high melting points were prepared at homologous temperatures T/Tm = 0.22-0.32, 0.40, and 0.56. The films of In, Sn, Bi, and Pb with the low melting points were prepared at T/Tm = 0.55-0.70, where T and Tm are the absolute temperatures of the mica substrate and the melting point of the metal, respectively. The surface morphology of these metal films was studied based on a structure zone model. The film surfaces of Au, Ag, and Cu prepared at the low temperatures (T/Tm = 0.22-0.24) consist of small round grains with diameters of 30-60 nm and heights of 2-7 nm. The surface heights of these metal films distribute randomly around the surface height at 0 nm and the morphology is caused by self-shadowing during the deposition. The grain size becomes large due to surface diffusion of adatoms and the film surfaces have individual characteristic morphology and roughnesses as T increases. The surface of the Al film becomes very smooth as T increases and the atomically smooth surface is obtained at T/Tm = 0.56-0.67 (250-350 °C). On the other hand, the atomically smooth surface of the Au film is obtained at T/Tm = 0.56 (473 ± 3 °C). The films of In, Sn, Bi, and Pb prepared at T/Tm = 0.55-0.70 also show the individual characteristic surface morphology.
Journal: Applied Surface Science - Volume 252, Issue 14, 15 May 2006, Pages 5083-5099