Enhancement of double-layer capacitance behavior and its electrical conductivity in layered poly (3, 4-ethylenedioxythiophene)-based nanocomposites

Abstract

In this letter, we report on the enhanced double-layer capacitance of a layered poly (3, 4-ethylene dioxythiophene) PEDOT- Mo O3 nanocomposite, which has been synthesized by a novel microwave irradiation method. The x-ray photoelectron spectroscopy analysis shows the changes in electron density and the shift in binding energy suggesting charge transfer from sulfur atoms upon PEDOT intercalation between Mo O3 layers. The room-temperature conductivity for the PEDOT- Mo O3 composite is found to be 1.82× 10-1 S cm-1, which is four orders of magnitude higher than that of the pristine oxide (3.78× 10-5 S cm-1). The enhanced double-layer capacitance of the PEDOT- Mo O3 nanocomposite (∼300 F g-1) compared to that (∼40 mF g-1) of pristine Mo O3 is attributed to higher electronic conductivity, enhanced bidimensionality, and increase in surface area of the nanocomposite. © 2005 American Institute of Physics.