Abstract
A strong electrochemiluminescence (ECL) emission from ZnO nanoparticles (NPs) suspended in aqueous solution at a Pt electrode or in NPs layers modified on a Pt or graphite electrode, which occurred between -1.0 V(versus Ag / AgCl , Sat. KCl ) and -2.0 V, was observed in 0.25 M NaOH in the presence of peroxydisulfate. The ECL intensity was linear to the concentration of suspended ZnO NPs in the range from 1.0 × 10-5 to 1.0 × 10-3 g/mL. The ECL spectrum of ZnO NPs revealed that both ZnO and peroxydisulfate-dissolved oxygen have been involved in the ECL process, and ECL spectrum has a red shift compared with photoluminescence (PL). The electrochemical redox behavior of ZnO NPs was also studied at a ZnO NPs modified carbon paste electrode by entrapping ZnO NPs in carbon paste, which reveals that the alkaline medium changed the surface state of ZnO NPs. The surface passivation has a significant effect on the ZnO NPs'electrochemical behaviors.
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