Tensile tests of the CNT films were conducted on a tensile tester
(XS(08)XT-3, Shanghai Xusai Co.), using a load cell of 15 N with precision
of 0.01 cN. The CNT films were cut into slices with 2 mm in
width, and fixed in between two pieces of cardboard paper. The samples
were tested using a gauge length of 10 mm and an elongation rate of
1.2 mm/min [43].