Two experiments in physics based on electrospun polymer nanofibers
(a) Basic elements of the electrospinning apparatus. (b) SEM image of polystyrene nanofibers, electrospun from a solution of tetrahydrofuran. The scale bar at the bottom of (b) corresponds to a length of . The average fiber diameter was .
(a) AFM image of an isolated polyaniline nanofiber bridging two gold electrodes. The inset shows a schematic of the fiber contacting two electrodes and the circuit used to experimentally determine the fiber conductivity. (b) Height profile along the dark line seen in (a). The average fiber diameter was .
Current-voltage characteritics of the polyaniline nanofiber shown in Fig. 2. The measurements were carried out in vacuum at .
Normalized resistance of individual electrospun HCSA-doped polyaniline nanofibers (a) and cast film of the same polymer (b) to vapors of methanol and . The response of the nanofibers is larger and slightly faster than the cast film due to the larger surface-to-volume ratio of the fiber over the film. The arrows indicate the moment when the specified gas was introduced into the chamber.
(a) Schematic of the Schottky nanodiode with the external electrical connections. (b) SEM image of the fiber at the wafer edge. The scale bar at the bottom of (b) corresponds to a length of . The fiber is flexible and does not fracture as it bends over the wafer edge. The average fiber diameter was .
Current-voltage characteristics at of the Schottky diode shown in Fig. 5. The inset shows a semilog plot of the forward bias current as a function of forward bias voltage used for extracting device parameters. is the saturation current.
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