title: Molecularly imprinted polyaniline-polyvinyl sulphonic acid composite based sensor for para-nitrophenol detection.
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%.
authors.affiliation: 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.
authors.forename: Abhijit Chandra
authors.initials: AC
authors.lastname: Roy
authors.forename: V S
authors.initials: VS
authors.lastname: Nisha
authors.forename: Chetna
authors.initials: C
authors.lastname: Dhand
authors.forename: Md Azahar
authors.initials: MA
authors.lastname: Ali
authors.forename: B D
authors.initials: BD
authors.lastname: Malhotra
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D054802:Molecular Imprinting; D015394:Molecular Structure; D009596:Nitrophenols / Q000032:analysis*; D011108:Polymers / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry*; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D013451:Sulfonic Acids / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D009596:Nitrophenols; D011108:Polymers; D011145:Polyvinyls; D013451:Sulfonic Acids; C416807:polyaniline; C024836:4-nitrophenol