It has been demonstrated the possibilities of designing the material for optical sensor primary transducer. The nanocomposites based on a cholesteric liquid crystal with aluminum nitride for material of primary transducer of sulfur dioxide optical sensor were studied. The spectral characteristics of studied nanocomposite under the influence of sulfur dioxide were studied. The shift of central wavelength of selective reflection under the sulfur dioxide concentrations was observed.

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The introduction of liquid crystal materials into the porous material host will help us to get optically active nanocomposites. Nanocomposite based on aluminum oxide host with cholesteric liquid crystal is characterized by a shift of bandwidth wavelength minimum. In case of intercalation of cholesteric liquid crystals into the pores of aluminum oxide host the shift of transmittance minimum into the short wave region are observed. We analyzed the ways, which indicate the deformation of the pitch of the cholesteric helix and showed the role of capillary forces in the deformation of the pitch of cholesteric liquid crystal.