Electrical Conductivity, Isothermal Stability, and Ammonia-Sensing Performance of Newly Synthesized and Characterized Organic鈥揑norganic Polycarbazole鈥揟itanium Dioxide Nanocomposite

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• 作者：Mohammad Shakir ; Noor-e-Iram ; Mohd Shoeb Khan ; Saud Ibrahim Al-Resayes ; Asif Ali Khan ; Umair Baig
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：May 14, 2014
• 年：2014
• 卷：53
• 期：19
• 页码：8035-8044
• 全文大小：634K
• 年卷期：v.53,no.19(May 14, 2014)
• ISSN：1520-5045

文摘

Electrically conductive polycarbazole鈥搕itanium dioxide nanocomposite (PCz/TiO₂) have been synthesized for the first time by in situ chemical oxidative polymerization of carbazole (Cz) in the presence of titanium dioxide (TiO₂) nanoparticles. FTIR, SEM, TEM, XRD, TGA, and DTA were used to characterize PCz/TiO₂ nanocomposites. The characterization results confirmed that there is a strong interaction between PCz and TiO₂ nanoparticles and the nanocomposites showed higher thermal stability than pure PCz. The composite showed electrical conductivity and isothermal stability in terms of DC electrical conductivity retention under ambient condition below 100 掳C. A nanocomposite-based sensor was fabricated for the detection of aqueous ammonia, it was found that the resistivity of the nanocomposites increases on exposure to ammonia at room temperature (25 掳C), and it showed a linear relationship between the responses and the concentration of ammonia. The comperative antimicrobial activities of PCz, its PCz/TiO₂-7 nanocomposite and ciprofloxacin drug with different bacteria have also been studied.