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. Author manuscript; available in PMC: 2013 May 27.
Published in final edited form as: ACS Nano. 2011 Mar 9;5(4):2447–2457. doi: 10.1021/nn103618d

Figure 6.

Figure 6

SEM images of parylene-coated tubes and comparison of calculated electrical properties. (a) Parylene coating of the tube surface inside and out, (b) a closer look at the inner surface of the tube. The small bumps are regions of parylene condensation. The tube surfaces are completely covered by parylene as evidenced by the increase of the wall thickness from 50 nm to over 200 nm, (c) comparison of specific resistance and specific capacitance. Four cases are considered: unmyelinated axons, myelin sheath, and Si/SiGe tubes with and without parylene coating. Similar to myelin, the SiGe nanomembrane is able to increase the specific resistance and decrease the specific capacitance. Additional coating with parylene further enhances such effects. Scale bar is 1 µm in (a) and 200 nm in (b).