Abstract
AbstractField emission characteristics of chloride doped polypyrrole (Cl‐PPy) films have been investigated. For this purpose, freestanding Cl‐PPy films have been synthesized by interfacial polymerization from two different monomer (pyrrole) concentrations (1 and 0.1 M), keeping the monomer to oxidant (FeCl3) concentration ratio equal to 1. The surface morphology of these Cl‐PPy films, as revealed from scanning electron microscopy, was found to be granular in nature. The average grain size of films prepared using 1 and 0.1 M pyrrole concentrations were ∼2.5 and ∼1 µm, respectively. The measured threshold field, that is, field required to draw an emission current density of 10 µA/cm2, for these two films were 0.27 and 0.15 V/µm, respectively. From these films, a maximum current density of 1 mA/cm2 could be drawn at an electric field of 0.42 and 0.29 V/µm, respectively. The field emission current (investigated at a preset value of 1 µA) was found to be very stable up to 3h, suggesting utility of Cl‐PPy films as a novel material for field emission based applications. Copyright © 2010 John Wiley & Sons, Ltd.
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