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Ammonia sensing by hydrochloric acid doped poly(m-aminophenol)–silver nanocomposite

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Abstract

Processable poly(m-aminophenol) (PmAP) was synthesized using ammonium persulfate oxidant in 0.6 M sodium hydroxide solution at room temperature. Then, in situ PmAP–silver nanocomposite film was obtained by casting PmAP film from dimethyl sulfoxide with silver hydroxide ammonia mixture at 140 °C. The nanocomposite film was doped with hydrochloric acid (HCl) by general solution doping technique. The undoped and HCl-doped films were characterized by ultraviolet visible spectroscopy, Fourier transformed Infrared spectroscopy, transmittance electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction analysis. Spectroscopic characterizations confirmed that the PmAP was doped by silver nanoparticles and it was further doped by HCl used. So, the synthesized PmAP–silver nanocomposite showed a conductivity of 1.01 × 10−6 S/cm, which was increased to 3.27 × 10−4 S/cm after HCl doping. The well dispersed silver nanoparticles with average size 130–150 nm was observed by SEM and TEM analysis. Unlike conventional ammonia sensor here, the resistivity of the nanocomposite film was decreased on exposure to ammonia gas and the sensing properties of the HCl-doped nanocomposite films were also reproducible. It can be seen that the % response of doped nanocomposite was unchanged while, the response time was decreased with increasing ammonia vapor concentrations in air. The ammonia-sensing characteristics of the HCl-doped nanocomposite film was explained on the basis of a proposed mechanism.

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Authors and Affiliations

  1. Department of Polymer Engineering, Birla Institute of Technology, Mesra, Ranchi, 835215, India

    Pradip Kar

  2. Chemical Engineering Department, Indian Institute of Technology, Kharagpur, 721302, India

    Narayan C. Pradhan

  3. Materials Science Centre, Indian Institute of Technology, Kharagpur, 721302, India

    Basudam Adhikari

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  1. Pradip Kar
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  2. Narayan C. Pradhan
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  3. Basudam Adhikari
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Correspondence to Pradip Kar.

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Kar, P., Pradhan, N.C. & Adhikari, B. Ammonia sensing by hydrochloric acid doped poly(m-aminophenol)–silver nanocomposite. J Mater Sci 46, 2905–2913 (2011). https://doi.org/10.1007/s10853-010-5165-1

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