In situ SEM studies on strain sensing mechanisms of PPy-coated electrically conducting fabrics

P. Xue, Xiaoming Tao, H. Y. Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)


This paper studies a flexible fabric strain sensor from PPy-coated fabrics prepared by a chemical vapor deposition method under low temperature, placing an emphasis on mechanisms of its strain sensing behavior. In situ tensile tests in a scanning electron microscope (SEM) were conducted for PPy-coated electrically conducting yarns, which were prepared by the same procedure as that for the PPy-coated fabrics, enabling it possible to observe in situ the phenomena that occurred on the fiber surface during fabric deformation. The investigation revealed that the PPy-coated nylon/polyurethane fabrics exhibited a high strain sensitivity of over 400 and very large workable strain range greater than 50%, which mainly attributes to the high conductivity and crack-opening and crack-closing mechanisms of PPy-coated polyurethane yarn, as well as the excellent properties of knitted fabric structure.
Original languageEnglish
Pages (from-to)3387-3392
Number of pages6
JournalApplied Surface Science
Issue number7
Publication statusPublished - 30 Jan 2007


  • Electrically conducting fabrics
  • Sensitivity
  • Strain sensing mechanism

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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