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(a) DA calibration curve for the CNF array from 1 to 5 μM in increments of 1 μM, normalized with respect to surface area. (b) O2 calibration curve for the CNF array with concentrations from 10-50 μM in increments of 10 μM, normalized with respect to surface area. (c) Plot demonstrating the detection of increasing concentrations of O2 (10-50 μM) while holding DA concentration constant at 3 μM.
