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<p>In this work, PANI based sensors have been developed for methanol detection. In this approach, pristine PANI and its nanocomposites with MnO<sub>2</sub> nanoparticles have been synthesized using chemical oxidative polymerization approach with various loading concentration (00, 10, 20 and 40 wt%) of MnO<sub>2</sub>. The FESEM and Raman spectroscopy results confirm the formation of desired PANI and its nanocomposites. The PANI@MnO<sub>2</sub> nanocomposite with 10wt% of MnO<sub>2</sub> has porous structure as well as smaller particles size as compared to pure PANI as demonstrated by FESEM results. These findings are attributed to the stronger interaction between PANI and MnO<sub>2</sub> nanoparticles leading to the conversion of PANI from the highly oxidized states to oxidized states, these results are also supported by using Raman analysis. These nanocomposites are further tested for methanol gas sensing applications. The sensing response (%), response and recovery time of fabricated sensors towards the methanol environment have been calculated by measuring the change in surface current of samples in different methanol environments with respect to without methanol environment at room temperature. The PANI@MnO<sub>2</sub> nanocomposites show the better response as compared to pristine PANI and response&#xa0;(%) increases with increase in loading concentration as well as ppm levels of methanol. The maximum response was calculated for PANI@MnO<sub>2</sub> nanocomposite with 40&#xa0;wt% of MnO<sub>2</sub> which is ~ 48% higher than pure PANI and better response time 90&#xa0;s at 60 ppm of methanol vapors. The better recovery time was observed for PANI at 40&#xa0;ppm level of methanol vapors. Also, the experimental findings are in good agreement the Langmuir kinetic theory for the adsorption and desorption of methanol vapors, and based on which a suitable mechanism of gas sensing has been proposed.</p>

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Facial growth of polyaniline based sensors for gas sensing application: Langmuir theoretical approach

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Rishi Pal,
  • Sneh Lata Goyal,
  • Ishpal Rawal

摘要

In this work, PANI based sensors have been developed for methanol detection. In this approach, pristine PANI and its nanocomposites with MnO2 nanoparticles have been synthesized using chemical oxidative polymerization approach with various loading concentration (00, 10, 20 and 40 wt%) of MnO2. The FESEM and Raman spectroscopy results confirm the formation of desired PANI and its nanocomposites. The PANI@MnO2 nanocomposite with 10wt% of MnO2 has porous structure as well as smaller particles size as compared to pure PANI as demonstrated by FESEM results. These findings are attributed to the stronger interaction between PANI and MnO2 nanoparticles leading to the conversion of PANI from the highly oxidized states to oxidized states, these results are also supported by using Raman analysis. These nanocomposites are further tested for methanol gas sensing applications. The sensing response (%), response and recovery time of fabricated sensors towards the methanol environment have been calculated by measuring the change in surface current of samples in different methanol environments with respect to without methanol environment at room temperature. The PANI@MnO2 nanocomposites show the better response as compared to pristine PANI and response (%) increases with increase in loading concentration as well as ppm levels of methanol. The maximum response was calculated for PANI@MnO2 nanocomposite with 40 wt% of MnO2 which is ~ 48% higher than pure PANI and better response time 90 s at 60 ppm of methanol vapors. The better recovery time was observed for PANI at 40 ppm level of methanol vapors. Also, the experimental findings are in good agreement the Langmuir kinetic theory for the adsorption and desorption of methanol vapors, and based on which a suitable mechanism of gas sensing has been proposed.