Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada.
Nanotechnology. 2010 Feb 19;21(7):75501. doi: 10.1088/0957-4484/21/7/075501. Epub 2010 Jan 18.
Many interactions drive the adsorption of molecules on surfaces, all of which can result in a measurable change in surface stress. This article compares the contributions of various possible interactions to the overall induced surface stress for cantilever-based sensing applications. The surface stress resulting from adsorption-induced changes in the electronic density of the underlying surface is up to 2-4 orders of magnitude larger than that resulting from intermolecular electrostatic or Lennard-Jones interactions. We reveal that the surface stress associated with the formation of high quality alkanethiol self-assembled monolayers on gold surfaces is independent of the molecular chain length, supporting our theoretical findings. This provides a foundation for the development of new strategies for increasing the sensitivity of cantilever-based sensors for various applications.
许多相互作用驱动分子在表面上的吸附，所有这些相互作用都可能导致表面应力的可测量变化。本文比较了各种可能的相互作用对基于悬臂梁的传感应用中整体感应表面应力的贡献。由于基底表面电子密度的吸附诱导变化而导致的表面应力比分子间静电或 Lennard-Jones 相互作用大 2-4 个数量级。我们揭示了在金表面上形成高质量烷硫醇自组装单层的表面应力与分子链长度无关，这支持了我们的理论发现。这为开发各种应用中基于悬臂梁的传感器的灵敏度的新策略提供了基础。
