Fig. 4
Flexibility and mechanical stability of the SWCNT MSCs. Digital photographs of a bent (bending radius = 1.5–4 mm), b folded, and c rolled MSCs (scale bar = 200 mm). Comparison of CV curves of undeformed (flat) MSCs with those of MSCs d bent around rods with radii of 1.5–4 mm, e folded, and f rolled into a tube with a diameter of ~1.2 mm. FEA results of g, the maximum (first principal) strain ɛmax in the Au layer of MSCs bent around rods with radii of 1.5–4 mm, h ɛmax vs. bending radius (the inset shows a magnified view; triangular, rectangular, and circular data points represent ɛmax at the center, edge, and corner of an interdigital finger, respectively), i ɛxx in the Au layer of a folded MSC, j magnified plot of ɛxx in the Au layer of interdigital finger of a folded MSC (the x-direction is along the arrowed curves), and k variation in ɛmax and ɛxx along the paths shown in j (the arrowed solid and dash-dot curves represent one-half of the total path distance along the center and edge of the electrode finger, respectively)
