Highly sensitive active medium of sensor NO2 , based on cholesteric  nematic mixture with impurities of carbon nanotubes

Z.M. Mykytyuk; M.V. Vistak; I.T. Kogut; V.S. Petryshak

doi:10.15330/pcss.22.3.426-431

Authors

Z.M. Mykytyuk Lviv Polytechnic National University
M.V. Vistak Danylo Halytsky Lviv National Medical University
I.T. Kogut Vasyl Stefanyk Precarpathian National University
V.S. Petryshak Lviv Polytechnic National University

DOI:

https://doi.org/10.15330/pcss.22.3.426-431

Keywords:

NO2 sensor, active medium, cholesterol-nematic mixture, carbon nanotubes

Abstract

The paper presents the results of the study of the parameters of the highly sensitive active medium of the NO₂ sensor based on a cholesterol-nematic mixture with an admixture of carbon nanotubes. The dependence of the change in the wavelength of the two transmission minima on the NO₂ concentration for cholesterol-nematic mixture with single-walled, double-walled and multi-walled nanotubes at different concentrations of nanotubes and two concentrations of nematically liquid crystal 5CB were obtained. It is established that by changing the ratio between the concentrations of nanotubes and nematic liquid crystals, it is possible to obtain mixtures that have the maximum spectral sensitivity coefficient in a given range of gas concentration.

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