Figure 3:

Frequency Independent Response. Current for 1μM dopamine for different microelectrodes as the frequency of the applied FSCV waveform is increased. Some of the data are reproduced with permission from reference 32. A. The current at a diskcarbon-fiber microelectrode drops dramatically by 90 Hz. B. For a disk CNT yarn microelectrode, the current is steady over all the frequencies. C. For a CNT-PEI fiber microelectrode, the current does not decrease with increasing frequency. D. There is also no decrease in sensitivity for acid spun CNT fiber microelectrodes upon increasing the frequency from 10 Hz to 90 Hz. The pH is 7.4 and scan rate is 400 V/s for all. n = 4-6.