Abstract
We investigated the electrogenerated chemiluminescence (ECL) behavior of Ru(bpy)32+ system at screen printed carbon electrodes (SPCEs) preanodized under different electrolytes. Background ECL signals were observed at a bare SPCE because of the presence of hydroxyl groups on the electrode surface. The SPCEs preanodized under NaOH solution (designated as SPCE*/NaOH) produced the most hydroxyl groups and caused 5.25 times higher ECL signal than that of a bare SPCE. It shows the advantage of the SPCE*/NaOH to detect CN─ based on the inhibited signal under the Fe(bpy)32+─ECL system. Note that the proposed system is much cheaper than the commonly used Ru(bpy)32+─ECL system. On the other hand, the background ECL signal from the oxygen functionalities can be diminished by applying the SPCE*/H3BO3 for ECL analysis applications. The negligible hydroxyl groups at the SPCE*/H3BO3 provides good sensitivity for the detection of epinephrine in Ru(bpy)32+─ECL system.
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