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Stability of the sensor. (A) Electrode signal stability; 5 μM oxycodone measured with one SWCNT 2.5% Nafion 6 times in a row. (B) Long-term stability. Three electrodes measured in 5 μM oxycodone after storing for 1, 8, 15, and 22 days after coating. Data shows the differences in the average values in the oxycodone peak current relative to day 1 in percentages as a function of days after coating.
