Shadnam Mohammad R, Kirkwood Sean E, Fedosejevs Robert, Amirfazli A
Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada, T6G 2G8.
J Phys Chem B. 2005 Jun 23;109(24):11996-2002. doi: 10.1021/jp0500642.
Laser-induced desorption of self-assembled monolayers (SAMs) from gold surfaces within context of the direct laser patterning methodology was investigated through combining results of a heat diffusion thermal model with desorption kinetics of alkanethiol SAMs. It was found that contrast plots of experimental scanning electron microscopy (SEM) images, which are correlated to surface coverage of SAMs desorbed after laser irradiation, agreed with the theoretically predicted surface composition of SAMs. The surface composition of SAM was then interpreted in terms of the wetting property of the resulting surface. The effect of incident laser beam power and size on the final spatial coverage of SAMs on the surface and feature sizes was investigated both experimentally and by modeling. Theoretical modeling and experimental evidence showed that the resulting feature sizes are wider when the surface is heated by a laser of higher power. Increasing the laser beam size results in broadening of feature sizes. Considering the correlation of the theoretical and experimental results, we concluded that the feature sizes are controllable in a predictable way (using the presented thermal-kinetics model) through varying laser beam power and beam size.
通过将热扩散热模型的结果与链烷硫醇自组装单分子层（SAMs）的解吸动力学相结合，研究了直接激光图案化方法中激光诱导自组装单分子层从金表面解吸的过程。研究发现，与激光照射后解吸的SAMs表面覆盖率相关的实验扫描电子显微镜（SEM）图像的对比度图，与理论预测的SAMs表面组成一致。然后根据所得表面的润湿性来解释SAM的表面组成。通过实验和建模研究了入射激光束功率和尺寸对表面上SAMs的最终空间覆盖率和特征尺寸的影响。理论建模和实验证据表明，当表面由更高功率的激光加热时，所得特征尺寸更宽。增加激光束尺寸会导致特征尺寸变宽。考虑到理论和实验结果的相关性，我们得出结论，通过改变激光束功率和光束尺寸，可以（使用所提出的热动力学模型）以可预测的方式控制特征尺寸。
