Alumina Membrane with Hour-Glass Shaped Nanochannels: Tunable Ionic Current Rectification Device Modulated by Ions Gradient
Figure 8
Ionic current rectification ratios of the hour-glass shaped alumina nanochannel with or without ionic concentration gradient. When is 0.1 mM, the enhanced rectification ratio with a maximum factor of 14.6 was obtained in a 10-fold concentration gradient solution (red histogram). With this forward concentration gradient increasing to 100-fold and 1000-fold, the rectification ratios decreased. When using the reversed concentration gradient stimuli (grey histogram), we got the similar rectification ratio results. The value of is 5.2 and that of is 10.0.
