Synthesis, Structural and Gas Sensing Properties of Nano-Branched Coaxial Polyaniline Fibers by Electrospinning

Abstract

Polyaniline (PANI) is a promising functional polymer in the field of toxic gas detection. In this paper, nano-branched coaxial PANI fibers were grown on electrospun poly(methyl methacrylate) (PMMA) nanofibers by an in situ chemical oxidative polymerization method. The resultant PANI/PMMA fibers were characterized by scanning electronic microscopy and Raman spectrum analysis. The conductivity of an individual coaxial PANI/PMMA fiber is about 2.123 S/cm and that of the conducting PANI coating layer is about 21.8 S/cm. The ammonia sensing properties of the samples were tested by means of impedance analysis. The nano-branched PANI fibers can response significantly to low concentration of ammonia due to large specific surface area, and the sensitivity shows good linear relationship to the ammonia concentration of ppm level. These results indicate that nano-branched coaxial PANI fibers are promising candidate for detection of toxic ammonia gas.

High-sensitivity gas sensors based on arranged polyaniline/PMMA composite fibers

“…4c). The sensitivity R/R 0 of the PANI/PMMA aligned fibers at 30 ppm ammonia was approximately four times higher than that of the non-woven fiber mat [27]. Moreover, the value of (R/R 0 − 1 = 0.56) was more than two times higher than that of PANI or its composition sensor [23,31] when exposure to gas at about 20 ppm for 10 s. Compared to random mats of fibers, aligned fibers may be its mechanical stability and well-defined current path so that variations in the interconnect resistance through the many contacts in a fiber network are eliminated.…”

“…The speed of the rotating collector was 650 rpm with an applied voltage of 7 kV and the distance is 6 cm from needle to the drum. The synthesis of PANI on PMMA fibers by in situ polymerization has been reported in detail [27]. And the reaction solution was prepared as follows: Firstly, 0.01 mol sulfosalicyclic acid dehydrate (SSA) was dissolved thoroughly in 50 ml deionized water.…”

Electrospun Poly(methyl Methacrylate)/Polyaniline Blend Nanofibres with Enhanced Toxic Gas Sensing at Room Temperature

“…15 Further, as-prepared PMMA nanofibres were used for coating polyaniline to form PMMA/PANI blend nanofibres by using dip-coating in-situ chemical oxidative polymerisation process. 16,17 In the typical process of polymerisation, 0.4 M aniline solution was prepared with 50 ml of 1 M HCl in double distilled water. A solution of 0.45 M ammonium peroxydisulphate (APS) was prepared with 50 ml of 1 M HCl in double distilled water and mixed to aniline solution drop wise at 5°C while stirring for 5 h. Asprepared PMMA nanofibres were inserted into the solution during polymerisation using dip-coating technique.…”

Investigating drug abuse in hair samples using the electrospun PEDOT–CNT nanostructure along with EA-IT-SPME

“…23 However, due to the low molecular weight and insolubility of conductive polymers in common solvents, which reduce the viscosity of the electrospinnable solution, electrospinning of pure conductive polymers is not convenient. 24 Two general approaches have been used for the electrospinning of conducting polymers: one is combining them with a usual polymer used in electrospinning, which leads to a significant reduction in the conductivity of the final product. Another approach involves the growth of conductive polymers on a skeleton of electrospun nanofibers through an in situ polymerization process.…”