Article ID Journal Published Year Pages File Type
9743386 Analytica Chimica Acta 2005 7 Pages PDF
Abstract
This work describes the development and fabrication of stable potentiometric solid state sensors for the perchlorate ion (ClO4−) based on doped poly(3,4-ethylenedioxythiophene) (PEDOT) films. PEDOT, one of the most promising conducting polymers, is extremely stable in its oxidized state. Using PEDOT(ClO4−) films as sensing material in ion selective electrodes presents a unique opportunity to create sensors having a longer lifetime compared to analogous sensors, such as those created using doped polypyrrole. Over the 8 month period of this study, the PEDOT(ClO4−) sensors exhibited a stable, linear response spanning at least five orders of magnitude in concentration (1 M to 1 × 10−5 M perchlorate) with near-Nernstian slopes approaching −59 mV/decade of ClO4− concentration and a limit of detection of 5 × 10−6 M. Carbon fibers and pencil leads were employed as alternative and inexpensive substrates for EDOT polymerization, addressing problems with the sensor's form (miniature size, flexibility) and cost.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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