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Optical, morphological and thermal studies of polyaniline (PANI)-ZnS composites and their sensitivity performance towards ammonia

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Author Affiliations

  • 1Department of Physics, Gauhati University, Guwahati-14, Assam, India
  • 2Department of Physics, Gauhati University, Guwahati-14, Assam, India

Res. J. Physical Sci., Volume 11, Issue (2), Pages 1-8, August,4 (2023)

Abstract

In the present study, optical, morphological and thermal studies of polyaniline (PANI)-ZnS composite are carried out and are tested for NH3 sensing. The composites are prepared by chemical co-dispersion by preparing ZnS nanoparticles (NPs) in the same bath of PANI synthesis. The as prepared composite materials are studied for optical, morphological and thermal properties through UV-Visible, photoluminescence (PL), FTIR, FESEM and TGA. The sensitivity towards ammonia is measured through the measurement of the change in electrical resistance of the material on NH3 intake. UV- Visible spectra show bands in the composite slightly red shifted compared to PANI. PL spectra shows some voids/defects related luminescence peaks which might act as site are to be suitable for gas sensing. FTIR spectra confirms the cross linking between PANI and ZnS. The FESEM study also confirms formation of nanocomposites. Addition of ZnS NPs effectively reduces the agglomeration of PANI and makes the composites more uniform and compact. PANI-ZnS composites show better thermal stability and follows three-dimensional diffusion mechanisms. The gas (NH3) sensing is due to exchange of electron at the surface and is dependent on the gas concentration.

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