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Effects of CuO and Oxidant on the Morphology and Conducting Properties of PANI:CuO Hybrid Nanocomposites for Humidity Sensor Application

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Abstract

PANI:CuO hybrid nanocomposites at different wt ratio of ammonium per sulfate are prepared by the in-situ chemical polymerization method. Morphology and bonding changes are observed in pure PANI and PANI:CuO:APSx hybrid nanocomposites. The structural changes are observed in the PANI:CuO hybrid nanocomposites due to the induction of CuO in the hybrid from XRD pattern. FTIR study confirms the presence of dopant molecules in the molecular structure. UV–Vis spectra reveal the presence of two absorption peaks at 236 and 358 nm due to π–π* transition of PANI and the shifting of 358 nm PANI peak to 484 nm in the formed PANI:CuO (0.1 M of APS) nanocomposite. The PL spectra indicate the occurrence of a broad emission peak at 395 nm in the polymer composites. The pellets are made using hydraulic press under uniform pressure. These pellets are investigated by humidity sensing. Relative humidity sensing response shows the reverse behavior. Resistance is decreases with the increase in relative humidity range between 5 and 75%RH. However, the sensitivity is found to be dependent on the type of dopant anions. The composite based sensors show better sensitivity, linearity, and quicker response time.

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Authors and Affiliations

  1. Department of Physics, Bannari Amman Institute of Technology, Sathyamangalam, Erode, Tamilnadu, India

    S. Ashokan

  2. Department of Physics, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, Tamilnadu, India

    S. Ashokan, P. Jayamurugan & V. Ponnuswamy

  3. Department of Physics, Adhiyamaan College of Engineering, Hosur, Tamilnadu, India

    P. Jayamurugan

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  1. S. Ashokan
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Correspondence to S. Ashokan.

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Ashokan, S., Jayamurugan, P. & Ponnuswamy, V. Effects of CuO and Oxidant on the Morphology and Conducting Properties of PANI:CuO Hybrid Nanocomposites for Humidity Sensor Application. Polym. Sci. Ser. B 61, 86–97 (2019). https://doi.org/10.1134/S1560090419010020

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