Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea.
Langmuir. 2013 Feb 26;29(8):2646-50. doi: 10.1021/la304346a. Epub 2013 Feb 8.
We report on the nanostructures of organic small-molecule pentacene crystals that have been vapor-deposited onto the capillary wave surfaces of thin liquid films. The characteristic lateral length of the capillary wave surface or the capillary length can be controlled by changing the thickness of the liquid films and, thus, the van der Waals interaction with the substrate. We find that the morphology of the organic crystals gradually varies from fractals to compact islands as the liquid film thickness increases. The square of average distance between organic crystal grains was also found to be proportional to the liquid film thickness. We discuss the possibility that these effects are driven by capillary fluctuations at the air-liquid interface.
我们报告了在薄液膜的毛细波表面上气相沉积的有机小分子并五苯晶体的纳米结构。通过改变液膜的厚度以及与基底的范德华相互作用，可以控制毛细波表面的特征横向长度或毛细长度。我们发现，随着液膜厚度的增加，有机晶体的形态逐渐从分形变为致密的岛屿。还发现有机晶粒之间的平均距离的平方与液膜厚度成正比。我们讨论了这些效应可能是由空气-液体界面的毛细波动驱动的可能性。
