Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Metal-organic frameworks-driven ZnO-functionalized carbon nanotube fiber for NO2 sensor

  • Woo, Sungyoon (Division of Materials Science and Engineering, Hanyang University) ;
  • Jo, Mingyeong (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Joon-Seok (Division of Materials Science and Engineering, Hanyang University) ;
  • Choi, Seung-Ho (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 : 2021.11.26
  • Published : 2021.11.30
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Abstract

In this study, heterogeneous ZnO/CNTF composites were developed to improve the NO2-sensing response, facilitated by the self-heating property. Highly conductive and mechanically stable CNTFs were prepared by a wet-spinning process assisted by the liquid crystal (LC) behavior of CNTs. Metal-organic frameworks (MOFs) of ZIF-8 were precipitated on the surface of the CNTF (ZIF-8/CNTF) via one-pot synthesis in solution. The subsequent calcination process resulted in the formation of the ZnO/CNTF composites. The calcination temperatures were controlled at 400, 500, and 600 ℃ in an N2 atmosphere to confirm the evolution of the microstructures and NO2-sensing properties. Gas sensor characterization was performed at 100 ℃ by applying a DC voltage to induce Joule heating through the CNTF. The results revealed that the ZnO/CNTF composite after calcination at 500 ℃ (ZnO/CNTF-500) exhibited an improved response (Rair/Rgas = 1.086) toward 20 ppm NO2 as compared to the pristine CNTF (Rair/Rgas = 1.063). Selective NO2-sensing properties were demonstrated with negligible responses toward interfering gas species such as H2S, NH3, CO, and toluene. Our approach for the synthesis of MOF-driven ZnO/CNTF composites can provide a new strategy for the fabrication of wearable gas sensors integrated with textile materials.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1C1C1010336). This work 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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