Abstract
In this study, we have reported liquid crystal based-sensor for the detection of pollen concentration which triggers an allergy. Cholesteric liquid crystal which is mesophase of thermotropic liquid crystals was used a sensing element in the pollen sensor. The cholesteric liquid crystal samples operating at room temperature were formulated using nematic liquid crystal and chiral dopants in different compositions. The pollen concentration which is embedded in the cholesteric liquid crystal was determined as a function of change in color of cholesteric liquid crystal in the prototype. We demonstrated that the variation of color from green to blue with the increasing pollen concentration using Ocean Optics spectrophotometer. Therefore, the rapid and easy determination of pollen concentration have been became possible by using this prototype. Our sensor will provide simplicity and self-test as a screen of pollen concentration by using the optical advantage of cholesteric liquid crystal as a sensing element.
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