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. Author manuscript; available in PMC: 2021 May 4.
Published in final edited form as: ECS Trans. 2020 May;97(7):901–927. doi: 10.1149/09707.0901ecst

Figure 4.

Figure 4.

SEM images of (A) a bar uncoated carbon fiber approximately 7 microns in diameter. (B) A carbon fiber electrodeposited in polyethyleneimine (PEI). A thin layer of polymer evenly coats the surface of the electrode and fills the ridge of the fiber. (C) A carbon fiber electrodeposited with PEDOT-PEI. A thin layer of polymer coats the surface of the electrode and fills the ridge of the fiber to a greater extent than the PEI-coated carbon fiber. The SEM settings were adjusted to enhance the resolution of the images. The probe current (P.C.) used ranged between 30 and 35. The working distance (WD) varied from 6 mm to 10 mm. The accelerating voltage ranged from 5kV to 20 kV and the magnification ranged from 3,300 to 3,500.