Fig. 4: TEM micrographs of the PAN nanofibers pyrolyzed at 600 and 950 °C.
From: Single and bundled carbon nanofibers as ultralightweight and flexible piezoresistive sensors
a, b TEM images of the broken edges of the nanofibers pyrolyzed at 600 and 950 °C respectively, showing the presence of several sheath layers. c Cross-section high-resolution TEM micrograph of the nanofiber pyrolyzed at 600 °C does not reveal any graphitic crystal domain formation. d Cross-section TEM micrograph of the nanofiber pyrolyzed at 950 °C showing the presence of lattice structures. Scale bars (a, b) = 20 nm; (c) = 5 nm; (d) = 2 nm.
