
240 Semiconductor Device-Based Sensors for Gas, Chemical, and Biomedical Applications
© 2011 by Taylor & Francis Group, LLC
6.3.1.4 First Impedance Studies of Protein Membranes
A simple model for the xed charge in the membrane has been used to calculate the resistance of a
permeable membrane, which included a concentration of xed charge N
t
and a bulk electrolyte with
ion concentration n
0
[18,86]. In the following ion concentration r, activity a, amd mobility u have
superscripts to denote the ion charge and subscripts s and m to denote values in the solution and
membrane, respectively. Assuming that the membrane is in equilibrium, the acti