In the original article,1 a few words were missing or mistyped in page 10, impedance characterization section, lines 10–17. The original sentences read:
“We can also estimate the faradaic impedance (due to tunneling of electrons from the electrodes to the electrolyte) by looking at the measurement at low frequencies (1 Hz). The total impedance at 1 Hz is 0.5 GΩ, meaning that Rf which is frequency independent can be no more than 0.5 GΩ regardless of the frequency. This means that the equivalent impedance of Cdl and Rf in parallel with each other has to also be greater than 0.5 GΩ. Comparing this to the total impedance of the sensor at 15 kHz which is 3.6 MΩ, we are able to assume that the loop containing Cdl and Rf is essentially an open circuit allowing us to simplify our model significantly as shown in Fig. 4(b).”
The corrected sentences are as follows: “We can also estimate the faradaic impedance (due to tunneling of electrons from the electrodes to the electrolyte) by looking at the measurement at low frequencies (1 Hz) and calculating Cdl at this frequency. The total impedance at 1 Hz is 0.5 GΩ, meaning that Rf in series with Rb (both frequency independent) can be no less than 0.5 GΩ across the whole spectrum. This means that the equivalent impedance of Cdl and Rf in parallel with each other and in series with Rb has to also be greater than 0.5 GΩ. Comparing this to the total impedance of the sensor at 15 kHz which is 3.6 MΩ, we are able to assume that the loop containing Cdl, Rf, and Rb is essentially an open circuit allowing us to simplify our model significantly as shown in Figure 4(b).”
References
- Esfandyarpour R., Javanmard M., Koochak Z., Esfandyarpour H., Harris J. S., and Davis R. W., “ Label-free electronic probing of nucleic acids and proteins at the nanoscale using the nanoneedle biosensor,” Biomicrofluidics 7(4 ), 044114 (2013). 10.1063/1.4817771 [DOI] [PMC free article] [PubMed] [Google Scholar]