Molecularly imprinted polyaniline-polyvinyl sulphonic acid composite based sensor for para-nitrophenol detection |
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| Authors: | Abhijit Chandra Roy V.S. Nisha Chetna Dhand Md. Azahar Ali B.D. Malhotra |
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| Affiliation: | 1. Department of Science & Technology Centre on Biomolecular Electronics, Biomedical Instrumentation Section, Materials Physics & Engineering Division, CSIR – National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India;2. Department of Chemical Engineering, Indian Institute of Technology, Kanpur 208016, UP, India;3. Department of Biomedical Engineering, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram, 502205, Andhra Pradesh, India;4. Department of Biotechnology, Delhi Technological University, Shahbad Daulatpur, Main Bawana Road, Delhi 110042, India |
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| Abstract: | We report results of the studies relating to the fabrication and characterization of a conducting polymer based molecularly imprinted para-nitrophenol (PNP) sensor. A water pollutant, para-nitrophenol is electrochemically imprinted with polyvinyl sulphonic acid (PVSA) doped polyaniline onto indium tin oxide (ITO) glass substrate. This PNP imprinted electrode (PNPI-PANI-PVSA/ITO) prepared via chronopotentiometric polymerization and over-oxidation is characterized by Fourier transform infra-red spectroscopy (FT-IR), UV–visible (UV–vis) spectroscopy, contact angle (CA), scanning electron microscopy (SEM), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) studies. The response studies of PNPI-PANI-PVSA/ITO electrode carried out using DPV reveal a lower detection limit of 1 × 10−3 mM, improved sensitivity as 1.5 × 10−3 A mM−1 and stability of 45 days. The PNPI-PANI-PVSA/ITO electrode shows good precision with relative standard deviation of 2.1% and good reproducibility with standard deviation of 3.78%. |
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| Keywords: | Molecular imprinting Conducting polymer Polyaniline Para-nitrophenol Polyvinyl sulphonic acid |
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