1. Stress at the Solid−Liquid Interface of Self-Assembled Monolayers on Gold Investigated with a Nanomechanical Sensor
- Author
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H. J. Güntherodt, Ch. Gerber, Emmanuel Delamarche, Marko Baller, T. Strunz, Juergen Fritz, Hans Peter Lang, Ernst Meyer, and James K. Gimzewski
- Subjects
Cantilever ,Materials science ,Silicon ,Analytical chemistry ,Ionic bonding ,chemistry.chemical_element ,Self-assembled monolayer ,Surfaces and Interfaces ,Condensed Matter Physics ,Stress (mechanics) ,Compressive strength ,chemistry ,Ionic strength ,Monolayer ,Electrochemistry ,General Materials Science ,Composite material ,Spectroscopy - Abstract
The interfacial stress of self-assembled monolayers on Au exposed to buffers of various pH values and ionic strengths is measured as a function of the liquid environment. The method uses two thiol-modified Au-covered silicon cantilevers and a differential method to compensate for thermal and refractive index changes of the liquid environment. Increasing pH and ionic strength leads to a bending, i.e., a compressive stress, of a mercaptohexadecanoic acid-covered cantilever compared to a hexadecanethiol-covered reference cantilever. In addition, the interfacial stress is found to be highly dependent on the surface density of the ionizeable mercaptohexadecanoic acid molecules when they are coadsorbed with hexadecanethiols on Au.
- Published
- 2000
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