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- Carboxylic acid-functionalized conducting-polymer nanotubes as highly sensitive nerve-agent chemiresistors
- Oh Seok Kwon; Chul Soon Park; Seon Joo Park; S Noh; S Kim; Hye Jeong Kong; J Bae; Chang-Soo Lee; H Yoon
- Bibliographic Citation
- Scientific Reports, vol. 6, pp. 33724-33724
- Publication Year
- Organophosphates are powerful inhibitors of acetylcholinesterase, which is critical to nerve function. Despite continuous research for detecting the highly toxic organophosphates, a new and improved methodology is still needed. Herein we demonstrate simple-to-fabricate chemiresistive gas sensors using conducting-polymer polypyrrole (PPy) nanotube transducers, which are chemically specific and capable of recognizing sub-ppb concentrations (ca. 0.5 ppb) of dimethyl methylphosphonate (DMMP), a simulant of nerve agent sarin. Interestingly, the introduction of carboxylic groups on the surface of PPy nanotube transistors resulted in enhanced sensitivity to DMMP via intermolecular hydrogen bonding. Furthermore, it was found that the sensitivity of the nanotube transducer depended on the degree of the carboxylic group introduced. Finally, a sensor array composed of 5 different transducers including the carboxylated nanotubes exhibited excellent selectivity to DMMP in 16 vapor species.
- Springer-Nature Pub Group
- Appears in Collections:
- Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
Division of Research on National Challenges > Bionanotechnology Research Center > 1. Journal Articles
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