Anomalous Kinetic Roughening of Nanostructured Ag Islands on Liquid Surfaces

概要

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By atomic force microscopy, the surface evolution and kinetic roughening of nanostructured Ag islands on silicone oil surfaces are studied. It is found that the islands are composed of quasi-circular granules with planar size around 50.0 nm, which is approximately independent of nominal thickness d. Our measurement indicates that the geometrical shape of the granules changes from plateau to sphere as d goes up. The dynamic scaling analysis reveal that the roughness exponent \alpha varies between 0.80 and 0.90 as d increases. The average roughness w_{\text{rms}} shows power-law relationship with d and the growth exponent \beta = 0.53 \pm 0.03 when d \leq 4.0 nm. However, w_{\text{rms}} deviates obviously from the power-law relationship for the samples with d > 4.0 nm. This anomalous behavior of \beta is explained by the competition between the shadowing and reemission processes, and then the kinetic evolution and formation mechanism of the islands are presented.
2012-03-15