Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Development of PDMS-based Drag Force-type Flowmeter with Graphite-CNT Composite as Piezoresistive Material

흑연과 CNT 복합체를 압저항체로 하는 PDMS 기반의 바람저항형 유속센서 개발

  • Sang Jun Park (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Min Gi Shin (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Noh Yeon Kim (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Sang Hoon Lee (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • 박상준 (서울과학기술대학교 기계.자동차공학과) ;
  • 신민기 (서울과학기술대학교 기계.자동차공학과) ;
  • 김노연 (서울과학기술대학교 기계.자동차공학과) ;
  • 이상훈 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2023.01.03
  • Accepted : 2023.01.18
  • Published : 2023.01.31
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Abstract

In this study, a polydimethylsiloxane (PDMS)-based drag force-type flowmeter was fabricated using a graphite-carbon nanotube (CNT) composite as a piezoresistive material and evaluated. The device was in the form of a cantilever, which was composed of the soft material, PDMS, and fabricated using a mold manufactured by a three-dimensional printer. The cost-effective graphite was mixed with CNTs to serve as a piezoresistive material. The optimal mixing ratio was investigated, and the piezoresistive material formed using a graphite:PDMS:CNT ratio of 1.5:1:0.01 was adopted, which showed a stable output and a high sensitivity. Various forward and backward air flows in the range of 0-10 m/s were measured using the fabricated flowmeter, and both tensile and compression characteristics were evaluated. The measured results showed a stable output, with the resistance change gradually increasing with the air flow rate. Repeatability characteristics were also tested at a repeated air flow of 10 m/s, and the flowmeter responded to the applied air flow well. Consequently, the fabricated device has a high sensitivity and can be used as a flowmeter.

Keywords

Acknowledgement

본 연구는 정부(교육부)의 재원으로 한국연구재단 기본연구지원사업의 지원으로 수행되었습니다. (NRF-2017R1D1A1B03030679)

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