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Investigation of the structural, optical and gas sensing properties of PANI coated Cu–ZnS microsphere composite

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journal contribution
submitted on 2023-03-15, 11:51 and posted on 2023-07-12, 12:41 authored by Hemalatha Parangusan, Jolly Bhadra, Zubair Ahmad, Shoaib Mallick, Farid Touati, Noora Al-Thani

Polyaniline (PANI)/Cu–ZnS composites with porous microspheres are prepared by a hydrothermal and in situ polymerization method. The structural, optical, and morphological properties are characterized by X-ray powder diffraction, FTIR, UV-vis, scanning electron microscope, transmission electron microscope. The XRD results confirmed that the PANI/Cu–ZnS composite is formed. The morphological analyses exhibited that the PANI/Cu–ZnS composite comprises the porous microspherical structures. The emission peaks obtained in photoluminescence spectra confirm the presence of surface defects in the prepared composite. The UV-DRS study shows that the bandgap of the samples is found to decrease for the PANI/Cu–ZnS composite compared to the pure Cu–ZnS sample. The calculated band gap (Eg) value of PANI/Cu–ZnS composite is 2.47 eV. Furthermore, the fabricated gas sensor based on PANI/Cu–ZnS can perform at room temperature and exhibits good gas sensing performance toward CO2 gas. In particular, PANI/Cu–ZnS sensor shows good response (31 s) and recovery time (23 s) upon exposure to CO2 gas. The p/n heterojunction, surface defects, and porous nature of the PANI/Cu–ZnS composite microsphere enhanced sensor performance. 

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Published in: RSC Advances
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  • English


Royal Society of Chemistry

Publication Year

  • 2020

Institution affiliated with

  • Qatar University

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