Abstract
Poly(2,5-dimethoxyaniline) (PDMA) has been synthesized by chemical oxidative polymerization technique using varying ratio (wt/wt) of binary oxidants; ferric chloride (FeCl3) and ammonium persulfate (APS). Fourier transform infrared (FT-IR) and ultraviolet-visible (Uv-vis) spectroscopic investigations provide the evidence of the presence of both benzenoid and quinoid ring units. The thermal analysis and structural characterization data suggests that the oxidant ratio greatly controls the molecular ordering in PDMA. Surface morphology shows the existence of both amorphous and crystalline domains wherein the crystalline domain size depends on the oxidant ratio. The dc conductivity (σdc) of PDMA is also a function of binary oxidant ratio and at FeCl3:APS (50:50), it increases by two orders of magnitude. Films of PDMA synthesized using FeCl3:APS (50:50) binary oxidant exhibits a decrease in the surface current on exposure to ammonia gas.
Highlights
Conducting polymers, because of their application in a variety of technologically important devices such as sensors, organic field effect transistors, rechargeable batteries, organic photovoltaics and energy storage systems, have been of great research interest for the last two decades [1,2,3,4,5,6]
We report here the influence of binary oxidants such as ferric chloride (FeCl3) and ammonium persulfate (APS) ratio on the spectroscopic, microscopic and electrical properties of chemically synthesized PDMA
Fourier transform infrared (FT-IR) and Uv-vis. spectroscopic investigations confirm the existence of combinations of benzenoid and quinoid forms in PDMA synthesized for the present investigation
Summary
Conducting polymers, because of their application in a variety of technologically important devices such as sensors, organic field effect transistors, rechargeable batteries, organic photovoltaics and energy storage systems, have been of great research interest for the last two decades [1,2,3,4,5,6]. This is a natural consequence of their remarkable chemical and physical attributes. The one dimensional nano-structured conducting polymers are of interest to researchers because of its applications in molecular, electronic and electrochromic display devices [7]. The possibility of using PDMA as ammonia gas sensing device is explored
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