J0404-8-2 カーボンナノチューブ/ポリマー複合材料を用いたひずみセンサ([J0404-8]知的材料・構造システム(8):各種センシング)

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This paper reports the piezoresistive behavior of a strain sensor made from a polymer/carbon nanotube nanocomposite experimentally and numerically. The sensor was experimentally fabricated from a polymer nanocomposite with multi-walled carbon nanotube (MWNT) fillers. The piezoresistivity of this sensor under tensile and compressive strains was measured. From the obtained experimental results, it is shown that the sensitivity of the sensor is inversely proportional to its nanotube loading. Furthermore, under a tensile strain, the sensitivity of the sensor is much higher than that of a conventional strain gage, whereas the sensitivity of the sensor under a compressive strain is only slightly higher than that of a conventional strain gage. This phenomenon is caused by the different patterns of conductive network change under tensile and compressive strains. On the other hand, from the numerical results, the CNT addition content dependency is coincident to the experimental measurement results qualitatively. Moreover, the sensitivity of nanocomposite strain sensors increases as the ratio of the tunneling resistance among nanofillers in the total sensor resistance increases.
一般社団法人日本機械学会の論文
2010-09-04