Smart Structures and Systems

  • 제18권2호
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  • Pages.217-231
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  • 2016
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Percolation threshold and piezoresistive response of multi-wall carbon nanotube/cement composites

  • Nam, I.W. (Infrastructure Research Center, K-water Institute) ;
  • Souri, H. (Center of Advanced Composite Materials (CACM), Department of Mechanical Engineering, The University of Auckland) ;
  • Lee, H.K. (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
  • 투고 : 2014.12.31
  • 심사 : 2016.04.08
  • 발행 : 2016.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

The present work aims to develop piezoresistive sensors of excellent piezoresistive response attributable to change in nanoscale structures of multi-wall carbon nanotube (MWNT) embedded in cement. MWNT was distributed in a cement matrix by means of polymer wrapping method in tandem with the ultrasonication process. DC conductivity of the prepared samples exhibited the electrical percolation behavior and therefore the dispersion method adopted in this study was deemed effective. The integrity of piezoresistive response of the sensors was assessed in terms of stability, the maximum electrical resistance change rate, and sensitivity. A composite sensor with MWNT 0.2 wt.% showed the lowest stability and sensitivity, while the maximum electrical resistance change rate exhibited by this sample was the highest (96 %) among others and even higher than those found in the literature. This observation was presumably attributed by the percolation threshold and the tunneling effect. As a result of the MWNT content (0.2 wt.%) of the sensor being near the percolation threshold (0.25 wt.%), MWNTs were close to each other to trigger tunneling in response of external loading. The sensor with MWNT 0.2 wt.% was able to maintain the repeatable sensing capability while sustaining a vehicular loading on road, demonstrating the feasibility in traffic flow sensing application.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF), Ministry of Land, Infrastructure and Transport (MOLIT)

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