Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Sensitivity enhancement of H2 gas sensor using PbS quantum dots

황화납 양자점 감지막을 통해 감도가 개선된 수소센서

  • Kim, Sae-Wan (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Na-Ri (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Kwon, Jin-Beom (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Jae Keon (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Jung, Dong Geon (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Kong, Seong Ho (Safety System R&D Group, Korea Institute of Industrial Technology) ;
  • Jung, Daewoong (Safety System R&D Group, Korea Institute of Industrial Technology)
  • 김세완 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 김나리 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 권진범 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 김재건 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 정동건 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 공성호 (한국생산기술연구원, 안전시스템연구그룹) ;
  • 정대웅 (한국생산기술연구원, 안전시스템연구그룹)
  • Received : 2020.10.22
  • Accepted : 2020.11.24
  • Published : 2020.11.30
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Abstract

In this study, a PbS quantum dots (QDs)-based H2 gas sensor with a Pd electrode was proposed. QDs have a size of several nanometers, and they can exhibit a high surface area when forming a thin film. In particular, the NH2 present in the ligand of PbS QDs and H2 gas are combined to form NH3+, subsequently the electrical characteristics of the QDs change. In addition to the resistance change owing to the reaction between Pd and H2 gas, the resistance change owing to the reaction between the NH2 of PbS QDs and H2 gas increases the current signal at the sensor output, which can produce a high output signal for the same concentration of H2 gas. Using the XRD and absorbance properties, the synthesis and particle size of the synthesized PbS QDs were analyzed. Using PbS QDs, the sensitivity was significantly improved by 44%. In addition, the proposed H2 gas sensor has high selectivity because it has low reactivity with heterogeneous gases such as C2H2, CO2, and CH4.

Keywords

References

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