Molecular structure, optical, electrical and sensing properties of PANI-based coatings with silver nanoparticles deposited from the active gas phase

• Published in: Applied surface science Vol. 351; pp. 811 - 818
• Main Authors: Ragachev, A.A., Yarmolenko, M.A., Xiaohong, Jiang, Shen, Ruiqi, Luchnikov, P.A., Rogachev, A.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2015
• Subjects: Ammonia gas; Coatings; Conductive polymer; Deposition; Detection; Electron beam deposition; Molecular structure; Nanoparticles; Nanostructure; Optical properties; Polyaniline; Sensing properties; Silver; Silver nanoparticles; Sensing properties; Conductive polymer; Electron beam deposition; Polyaniline; Ammonia gas; Silver nanoparticles
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.06.008

•PANI-based coatings were deposited by plasma chemical solvent-free method.•PANI+AgCl coating has a partially doped structure with low variation in size of oxidized and reduced PANI units.•The increasing of the sensing performance of this coating was established at the low frequency region of impedance spectra. The plasma chemical solvent-free method of doped and nanocomposite polyaniline-based (PANI-based) conductive coatings deposition was elaborated. Molecular structure, morphology, optical, electrical and sensing properties of PANI-based coating were investigated by Fourier transform infrared, UV–vis, impedance spectroscopy methods and transmittance electron microscopy. The synthesized PANI-based coatings containing silver nanoparticles have a partially doped structure with low variation in size of oxidized and reduced PANI units. The nanocomposite PANI-based coatings were deposited onto interdigital capacitor for ammonia gas sensing applications. The increasing of the sensing performance of the PANI-based coatings with silver nanoparticles was established in particular at the low frequency region of impedance spectra. The high sensitivity and linearity of this sensor response were examined at a direct and alternating voltage with ammonia concentrations up to 10ppm.