Price William J, Leigh Shannon A, Hsu Stephen M, Patten Timothy E, Liu Gang-yu
Department of Chemistry, University of California, Davis, California 95616, USA.
J Phys Chem A. 2006 Feb 2;110(4):1382-8. doi: 10.1021/jp0544540.
The dependence of the local Young's modulus of organic thin films on the size of the domains at the nanometer scale is systematically investigated. Using atomic force microscopy (AFM) based imaging and lithography, nanostructures with designed size, shape, and functionality are preengineered, e.g., nanostructures of octadecanethiols inlaid in decanethiol self-assembled monolayers (SAMs). These nanostructures are characterized using AFM, followed by force modulation spectroscopy and microscopy measurements. Young's modulus is then extracted from these measurements using a continuum mechanics model. The apparent Young's modulus is found to decrease nonlinearly with the decreasing size of these nanostructures. This systematic study presents conclusive evidence of the size dependence of elasticity in the nanoregime. The approach utilized may be applied to study the size-dependent behavior of various materials and other mechanical properties.
系统地研究了有机薄膜的局部杨氏模量在纳米尺度上对畴尺寸的依赖性。利用基于原子力显微镜（AFM）的成像和光刻技术，预先设计具有特定尺寸、形状和功能的纳米结构，例如镶嵌在癸硫醇自组装单分子层（SAMs）中的十八烷硫醇纳米结构。使用AFM对这些纳米结构进行表征，随后进行力调制光谱和显微镜测量。然后使用连续介质力学模型从这些测量中提取杨氏模量。发现表观杨氏模量随着这些纳米结构尺寸的减小而非线性降低。这项系统研究提供了纳米尺度下弹性尺寸依赖性的确凿证据。所采用的方法可用于研究各种材料的尺寸依赖性行为以及其他力学性能。
