Abstract
We report on the implementation of a microstructure comprising an array ofmicropillars to create a thin and stable film of nematic liquid crystal (LC), 5CB:4′-pentyl-4-cyanobiphenyl, and the use of the microsystem for the colorimetricdetection of vapor analytes. The microstructure uses capillary forcegenerated by an array of cylindrical micropillars to steadily support a22 µm thin film of LC, and overcomes susceptibility to gravity and shock. The feasibility ofusing the microsystem for gas phase detection is demonstrated by using dimethylmethylphosphonate (DMMP) gas to change the orientation of the LC and hence modulatethe intensity of light transmitted through a crossed pair of polarizing films. Themicrostructure potentially offers a simple and portable solution to toxic gas detection.
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