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Sensitivity versus selectivity at low catecholamine concentrations. Relative fluorescence change of sensors upon addition of 100 nM (a) and 1 μM (b) of dopamine, epinephrine, and norepinephrine in the range from 0 (i.e., no change in fluorescence intensity) to 1.3 (equaling 130% fluorescence increase). Here, the (6,5)-SWCNTs responses at 987 nm were evaluated.
