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This papers presents multi-walled carbon nanotube (MWCNT) based nano composites and their
characteristics to develop a smart material having piezoresistivity for strain sensing. 0.5, 2, 3 and 10 wt%
MWCNT / epoxy composites were fabricated and electrical conductivity was obtained from 0.5 wt%. The
resistance change of the composites was measured with respect to the change of strain and the gauge factors
of the composite were derived and were compared with others. It is deduced that the largest contribution of
piezoresistivity of the composite comes from slippage of overlaying or bundled MWCNT in the matrix from a
macroscopic standpoint.