液相基底温度对沉积银原子及其团簇凝聚过程的影响

研究了沉积银原子及其团簇在液相基底(硅油)表面的凝聚过程随基底温度的变化关系.实验结果表明:当硅油基底温度升高时,沉积银原子及其团簇的凝聚过程仍基本符合二阶段生长模型; 样品具有明显的边缘效应,在样品中心区域,凝聚体的覆盖率比边缘的相应值小,样品中心区域的凝聚体覆盖率先随薄膜名义厚度的增加迅速增大,然后逐渐趋于饱和,覆盖率趋于饱和时的膜厚值随基底温度的升高而降低; 对于一定的薄膜名义厚度,硅油基底温度越高,中心区域的凝聚体覆盖率越小.银原子凝聚体的分枝平均长度随基底温度的演化过程也具有类似的规律.对沉积银 关键词： 薄膜 液相基底 分枝状凝聚体 生长模型

Temperature dependence of the aggregation mechanism of silver atoms deposited on liquid substrates

Temperature dependence of the aggregation mechanism of silver atoms deposited on liquid substrates is reported. The experiment shows that the aggregation mechanism of the silver atoms conforms to the two-stage growth model approximately when the substrate temperature changes. The fringe effect of the substrates was visible in the experiment and the coverage ratio of the silver atom clusters in the central region of the sample was smaller than that on the edge of the sample. As the nominal film thickness increased, the coverage ratio went up rapidly first, then its growth speed slowed down and finally the coverage ratio approached a saturation value. The film thickness corresponding to the saturation coverage ratio decreased obviously with the increase of the substrate temperature. For a fixed nominal film thickness, as the oil temperature increased, the coverage ratio decreased. The evolvement behavior of the average length of the silver aggregate branches is similar to that of the coverage ratio in the central region of the sample. The diffusion mechanism of the silver atomic clusters towards the sample edge is also presented.