Metal-organic frameworks-driven ZnO-functionalized carbon nanotube fiber for NO2 sensoropen access
- Authors
- 우성윤; 조민경; 이준석; 최승호; 이성주; 정현수; 최선진
- Issue Date
- Nov-2021
- Publisher
- 한국센서학회
- Keywords
- Metal-organic frameworks (MOFs); Carbon nanotube fiber (CNTF); Self-heating; Gas sensors; NO2.
- Citation
- 센서학회지, v.30, no.6, pp.369 - 375
- Indexed
- KCI
- Journal Title
- 센서학회지
- Volume
- 30
- Number
- 6
- Start Page
- 369
- End Page
- 375
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140354
- DOI
- 10.46670/JSST.2021.30.6.369
- ISSN
- 1225-5475
- Abstract
- In this study, heterogeneous ZnO/CNTF composites were developed to improve the NO2-sensing response, facilitated by the selfheating 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 600oC in an N2 atmosphere to confirm the evolution of the microstructures and NO2-sensing properties. Gas sensor characterization was performed at 100oC by applying a DC voltage to induce Joule heating through the CNTF. The results revealed that the ZnO/CNTF composite after calcination at 500oC (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.
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