Functionalization of indium tin oxide electrode with both of dendrimer-encapsulated Pt nanoparticles and chemically converted graphenes for enhanced electrochemiluminescence of luminol/H2O2.
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.
Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Seoul, 130-701, Republic of Korea.
Jisoo
J
Yoon
Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Seoul, 130-701, Republic of Korea.
Taehoon
T
Cho
Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Seoul, 130-701, Republic of Korea.
Hyojung
H
Lim
Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Seoul, 130-701, Republic of Korea. jkim94@khu.ac.kr.|KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul, 130-701, Republic of Korea. jkim94@khu.ac.kr.
Joohoon
J
Kim
Chemically converted graphene; Dendrimer-encapsulated Pt nanoparticle; Electrochemiluminescence; H2O2; Luminol