Aggregation characteristics of gold atoms deposited on molten glass surfaces

The diffusion, aggregation and crystallization characteristics of gold atoms deposited on molten glass surfaces are studied. Experimental results indicate that the gold atoms first form a characteristic web-shaped Au film on the colloid glass surface, and the average diameter of the crystal grains in the film is about 20 nm. The area of the meshes gradually increases and then the whole film tatters. Thus the compact clusters are formed. The saturated diameter of the compact clusters is about 1.2μm and its diffusion coefficient D is of the order of 107-108 cm2/s. The compact clusters diffuse on the molten glass surface quickly and quasi-randomly,and finally large ramified aggregates with diameter of about 50 μm from.