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To explore the effect of aspect ratio (AR) of nanotubes on conductivity and resistance-pressure sensitivity, four kinds of multiwall carbon nanotubes (MWNT) with different aspect ratios (AR=50, 75, 333, and 500) were dispersed into methylvinyl silicone rubber (VMQ) to fabricate the MWNT/VMQ nanocomposites. Results show that the composites with low concentration nanotubes at low AR value show great resistance-pressure sensitivity. High AR is not beneficial for the improvement of conductivity, and at the same concentration of MWNT, the composites with high AR tubes display large resistance-pressure sensitivity. The sensitivity is dependent on the quantity of conductive channels formed in the composites.
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Jiang et al. (2007) studied this question.
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