title: Carboxylic Acid-Functionalized Conducting-Polymer Nanotubes as Highly Sensitive Nerve-Agent Chemiresistors.
abstract: 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.
authors.affiliation: Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea.
authors.forename: Oh Seok
authors.initials: OS
authors.lastname: Kwon
authors.affiliation: Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea.|Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea.|Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea.
authors.forename: Chul Soon
authors.initials: CS
authors.lastname: Park
authors.affiliation: Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea.|Center for Integrated Smart Sensors (CISS), KAIST, Daejeon 34141, South Korea.
authors.forename: Seon Joo
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea.
authors.forename: Seonmyeong
authors.initials: S
authors.lastname: Noh
authors.affiliation: Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea.
authors.forename: Saerona
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea.
authors.forename: Hye Jeong
authors.initials: HJ
authors.lastname: Kong
authors.affiliation: Department of Applied Chemistry, Dongduk Women's University, Seoul 02748, South Korea.
authors.forename: Joonwon
authors.initials: J
authors.lastname: Bae
authors.affiliation: Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea.|Nanobiotechnology and Bioinformatics (Major), University of Science &Technology (UST), Daejeon 34141, South Korea.
authors.forename: Chang-Soo
authors.initials: CS
authors.lastname: Lee
authors.affiliation: Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea.|School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, South Korea.
authors.forename: Hyeonseok
authors.initials: H
authors.lastname: Yoon