DOI: https://doi.org/10.29363/nanoge.aohm.2019.025
Publication date: 8th January 2019
Although significant effort has been devoted to developing high-performance mixed conductors, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) is still regarded as one of the most promising materials for this purpose due to its favorable electrical/electrochemical properties, microstructural versatility, and the relatively low production cost. Herein, we establish a correlation between the composition of PEDOT:PSS films, their degree of crystallinity, their electrochemical transistor performance, and their operational stability. We demonstrate that specific sulfuric acid treatments efficiently remove excess PSS and simultaneously induce crystallization of the PEDOT into an anisotropic ‘edge-on’ texture. Such microstructural changes lead to a significant improvement in electrochemical transistor performance (i.e., [μC*] ~ 490 F·cm-1V-1s-1) and operational stability via an improvement in electronic transport, an increase of the content of conducting polymer chain per unit volume, and a reduced swelling of the films in the aqueous electrolyte. All these results suggest that crystallized PEDOT:PSS is a promising material for future bioelectronics applications. Insights gained on the PEDOT:PSS’s strucutre/property/performance interrelations will also be key in designing the next-generation organic bioelectronic material.
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