Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Selective acetate detection using functional carbon nanotube fiber

  • Choi Seung-Ho (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Joon-Seok (Division of Materials Science and Engineering, Hanyang University) ;
  • Choi, Won-Jun (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Sungju (Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST)) ;
  • Jeong, Hyeon Su (Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST)) ;
  • Choi, Seon-Jin (Division of Materials Science and Engineering, Hanyang University)
  • Received : 2021.10.15
  • Accepted : 2021.11.19
  • Published : 2021.11.30
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Abstract

We developed a chemiresistive anion sensor using highly conductive carbon nanotube fibers (CNTFs) functionalized with anion receptors. Mechanically robust CNTFs were prepared via wet-spinning utilizing the nematic liquid crystal properties of CNTs in chlorosulfonic acid (CSA). For anion detection, polymeric receptors composed of dual-hydrogen bond donors, including thiourea 1, squaramide 2, and croconamide 3, were prepared and bonded non-covalently on the surface of the CNTFs. The binding affinities of the anion receptors were studied using UV-vis titrations. The results revealed that squaramide 2 exhibited the highest binding affinity toward AcO-, followed by thiourea 1 and croconamide 3. This trend was consistent with the chemiresistive sensing responses toward AcO- using functional CNTFs. Selective anion sensing properties were observed that CNTFs functionalized with squaramide 2 exhibited a response of 1.08% toward 33.33 mM AcO-, while negligible responses (<0.1%) were observed for other anions such as Cl-, Br-, and NO3-. The improved response was attributed to the internal charge transfer of dual-hydrogen bond donors owing to the deprotonation of the receptor upon the addition of AcO-.

Keywords

Acknowledgement

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1C1C1010336). This study was also supported by the U.S. Army Combat Capabilities Development Command Soldier Center (DEVCOM SC) and International Technology Center Pacific (ITC-PAC) Global Research Project under contract FA520920P0130 and conducted at Hanyang University.

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