Figure 6:

The CL signal detected using 0.5 mm Ce(IV) in 0.25 m sulfuric acid as oxidant and 1 mm oxalate as the analyte: 1, plain TiO2 NPs; 2, concentrated Ru(bpy)32+ aqueous solution; 3, diluted Ru(bpy)32+ aqueous solution; 4, concentrated TiO2-Ru(bpy)32+ NPs; 5, diluted TiO2-Ru(bpy)32+ NPs.

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