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Zn(OH)F Nanorods for Highly Sensitive NO2 Gas Sensor Applications

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Abstract

In this study, Zn(OH)F nanorods were synthesized via a microwave-assisted hydrothermal process and employed for NO2 gas sensor, for the first time. Without adding NH4F in the synthesis process, caltrop-like ZnO structure was formed. The characteristics of Zn(OH)F nanorods were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), and compared to those of caltrop-like ZnO. Additionally, the Zn(OH)F nanorods were further systematically studied by annealing them at 250, 350, and 450 °C to examine thermal stability. The Zn(OH)F nanorods start to transform after annealing at 350 °C. The sensor based on the Zn(OH)F nanorods showed very high response of 63.4 toward 1.3 ppm of NO2 gas at 100 °C, which is 8.6 times higher than the response of the sensor based on the caltrop-like ZnO. In addition, the sensor based on Zn(OH)F nanorods showed an excellent selectivity toward H2 (5 ppm), C2H5OH (10.6 ppm), NH3 (10.6 ppm), C6H5CH3 (36.2 ppm), and CH3COCH3 (2.8 ppm).

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Acknowledgments

This work was supported by the Korea Basic Science Institute (KBSI) National Research Facilities & Equipment Center (NFEC) grant funded by the Korea government (Ministry of Education) (No. 2019R1A6C1030010). Also, J.-S. Park was partially supported by Project No. P0006858 of International Collaboration Program by KIAT and MOTIE in Rep. Korea.

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Authors and Affiliations

  1. SKKU Advanced Institute of Nano Technology, Sungkyunkwan University, Suwon, 16419, Korea

    Tae-yil Eom

  2. Smart Sensor Research Center, Korea Electronics Technology Institute (KETI), Seongnam, 13509, Korea

    Joon-Shik Park

  3. Department of Smart Fab. Technology, Sungkyunkwan University, Suwon, 16419, Korea

    Hoo-Jeong Lee

Authors
  1. Tae-yil Eom
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  2. Joon-Shik Park
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  3. Hoo-Jeong Lee
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Corresponding authors

Correspondence to Joon-Shik Park or Hoo-Jeong Lee.

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Eom, Ty., Park, JS. & Lee, HJ. Zn(OH)F Nanorods for Highly Sensitive NO2 Gas Sensor Applications. J. Korean Phys. Soc. 77, 1055–1060 (2020). https://doi.org/10.3938/jkps.77.1055

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  • DOI: https://doi.org/10.3938/jkps.77.1055

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