Abstract
Abstract The surface pressure of Langmuir monolayers can be measured by a Langmuir balance or Wilhelmy plate. However, both of these sensors have a long contact length with the monolayer, normally longer than 10 mm. An optical-fiber sensor has been developed for the measurement of the surface pressure of monolayers. It has a short contact length with the monolayer, less than 250 μm, while the sensitivity of this method is still very high. Thus, the new sensor presents a small disturbance to the monolayer and is very suitable for the study of inhomogeneity problems of monolayers, which are very important for the application of such layers to optical and molecular electronic devices. In the discussion, the feasibility of the application of the new optical-fiber sensor to the atomic force microscope is also analyzed.
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