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Functionalization of indium tin oxide electrode with both of dendrimer-encapsulated Pt nanoparticles and chemically converted graphenes for enhanced electrochemiluminescence of luminol/H2O2

Yoon, Jisoo, Cho, Taehoon, Lim, Hyojung, Kim, Joohoon
Analytical and bioanalytical chemistry 2016 v.408 no.25 pp. 7165-7172
amines, chemical reduction, electrochemiluminescence, electrochemistry, electrodes, encapsulation, graphene oxide, hydrogen peroxide, indium tin oxide, nanoparticles, oxidation
Here, we report highly enhanced electrochemiluminescence (ECL) of luminol in the presence of H₂O₂ on indium tin oxides (ITOs) modified with both of dendrimer-encapsulated Pt nanoparticles (Pt DENs) and chemically converted graphenes (CCGs). The ITO electrodes were electrochemically modified with size-monodisperse Pt DENs via electrooxidative grafting of the terminal amines of the dendrimers encapsulating Pt nanoparticles. The Pt DEN-modified ITOs were then decorated with CCG sheets via electrostatic attachments of graphene oxides (GOs) and subsequent chemical reduction of the GOs to the CCGs. The resulting CCG-Pt DEN/ITO electrodes exhibited highly catalyzed electrochemical oxidation of luminol/H₂O₂, leading to significantly enhanced ECL of the luminol/H₂O₂ system, i.e., ∼15-fold enhancement, compared to ECL emission from bare ITOs even at lower applied potentials, which allowed sensitive ECL-based analysis of H₂O₂ using the CCG-Pt DEN/ITOs. Graphical abstract We report the highly enhanced electrochemiluminescence of the luminol/H₂O₂ system on the indium tin oxide electrodes modified with both of Pt nanoparticles and chemically converted graphenes using amine-terminated dendrimers