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(a) SEM image of f-CNT-SS. The diameter of the fibre is ~6.5 μm. Scale bar: 10 μm. (b,c) Magnified SEM images of f-CNT-SS surface showing a uniform mat-like covering. Scale bars: 1 μm. (d) TEM cross section of a dragline silk fibre with f-CNT coating (red arrow). Silk folding due to uneven sectioning. Scale bar: 1 μm. (e) TEM image indicating nanotube penetration (red arrows) into the silk structure. Scale bar: 250 nm.
