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Fabrication and Optimization of Conductive Paper Based on Screen-Printed Polyaniline/Graphene Patterns for Nerve Agent Detection

In this work, a high-performance sensor capable of effectively detecting nerve gas, a type of chemical warfare agent, was realized by conductive paper with polyaniline (PANI) nanofiber and graphene sheet. To realize the high-performance nerve gas sensor, dimethyl methylphosphonate (DMMP) was used as a model of nerve gas, and the conductive paper sensor was used to detect DMMP at a concentration of parts per billion within a few seconds. Improvements in electrical properties and sensor performance of conductive papers were realized by the addition of optimized amounts of graphene (0.14 wt %) and polyethylene oxide (13.1 wt %). In addition, poly(vinylbutyral-co-vinyl alcohol-co-vinyl acetate) (P(VB-co-VA-co-VAc)) copolymer significantly improved the intermolecular forces between PANI nanofiber, graphene sheet, and cellulosic paper. Conductive patterns containing PANI nanofiber/graphene cofillers were fabricated into sensor electrodes of various sizes and shapes by screen printing. The prepared conductive pa...