Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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HNS Detection Properties of Printed Ag:CNT Film as Liquid Sensor

Ag:CNT 인쇄박막 액체 센서의 위험유해물질 검출 특성

  • Ko, Dongwan (Major of Electronic Materials Engineering, Korea Maritime and Ocean University) ;
  • Choi, Junseck (Major of Electronic Materials Engineering, Korea Maritime and Ocean University) ;
  • Lee, Sangtae (Department of Offshore Plant Management, Korea Maritime and Ocean University) ;
  • Chang, Jiho (Major of Electronic Materials Engineering, Korea Maritime and Ocean University)
  • 고동완 (한국해양대학교 전자소재공학과) ;
  • 최준석 (한국해양대학교 전자소재공학과) ;
  • 이상태 (한국해양대학교 해양플랜트운영학과) ;
  • 장지호 (한국해양대학교 전자소재공학과)
  • Received : 2019.02.21
  • Accepted : 2019.03.06
  • Published : 2019.05.01
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Abstract

We fabricated a printed Ag:CNT film as a liquid sensor for the detection of HNS (hazardous and noxious substances) in seawater. The paste required for printing was prepared using Ag powder, MWCNTs (multi-walled carbon nanotubes), and an organic binder. The heat treatment process for binder removal was optimized. In order to confirm that the sensor was operational, the resistance change characteristics in brine (3.5%) and methanol (99.8%) were assessed at $20^{\circ}C$. EDL (electrical double layer) formation and redox reactivity were confirmed as the most important reactions affect each electrical property of sensor in brine and methanol. From these results, it was determined that printed Ag:CNT film can be applied as a sensor to detect HNS in seawater.

Keywords

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Fig. 1. SEM images of surface shape according to heat treatment temperature variation. The dark area and bright area are binder and silver, respectively. MWCNT was also observed from the sample annealed at 350℃.

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Fig. 2. Thickness and resistance variation of printed films according to annealing temperature.

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Fig. 3. Sensitivity variation of printed film under the applied bias of 1 V. When it soaked into methanol, each film reveals relevant sensitivity according to heat treatment temperature.

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Fig. 6. Sensitivity variation of Ag:CNT printed layer sensor.

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Fig. 4. Resistance variation of printed film soaked in (a) brine and (b) methanol, respectively. Contradictory resistance change is observed.

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Fig. 5. Temperature variation of sensor reaction about (○) brine and (●) methanol.

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