Fig. 1.

Illustrative images of the morphology of the poly-silicon (pSi) nanotube fabrics at each fabrication step. As-electrospun fabrics of polymer (a), the carbon nanofiber-based fabrics after carbonization (b, c) and the silicon nanotube-based fabrics after the whole fabrication process (b). Scanning electron microscope cross-sectional images of thermoelectric fabric at different scales with scale bars corresponding to d 50 µm, e 5 µm, f 500 nm