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. Author manuscript; available in PMC: 2014 May 21.
Published in final edited form as: J Am Chem Soc. 2009 Jun 17;131(23):8211–8220. doi: 10.1021/ja901120f

Figure 1.

Figure 1

Schematics of rectifying platforms that can be used as a template for presented biosensor. A) A homogeneously charged conical nanopore. B) A conical bipolar diode. Ionic diodes were denoted in a following way: first the surface charge of a tip (small opening) followed by the surface charge of the base (large opening). For example, for the configuration shown in (B), the tip is positive, and the base is negative, thus in our notation this diode is abbreviated as {+;−}. The symbols have the following meaning: A – base radius, a – tip radius, α - divergence angle of a cone, z0 – transition zone for the surface charge change. For all numerical calculations, the surface charge was assumed to change abruptly at z0.