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Dendrimer Encapsulated Pt Nanoparticle-Immobilized G...
Electrochemical Discrimination of Phthalic Acid amo...
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Modification of Indium Tin Oxide (ITO) with Dendrimer-Encapsulated Nanoparticles Provides Enhanced Stable Electrochemiluminescence (ECL) of Ru(bpy)32+/Tripropylamine while Preserving Optical Transparency of ITO for Sensitive ECL-Based Analyses
| Journal | Anal. Chem. |
|---|---|
| Author | Yeoju Kim, Joohoon Kim |
| Citation | 2014, 86, 1654?1660 |
| DOI | http://dx.doi.org/10.1021/ac403415m |
Here, we report highly enhanced stable electrogenerated chemiluminescence (ECL) of Ru(bpy)32+ (bpy = 2,2’-bipyridyl) with tripropylamine (TPrA) coreactant on indium tin oxide (ITO) electrodes modified with amine-terminated dendrimers encapsulating catalytic nanoparticles while maintaining optical transparency of ITO, and feasibility of the modified ITOs to sensitive ECL-based assays. As model systems, we prepared Pt and Au dendrimer-encapsulated nanoparticles (DENs) using amine-terminated sixth generation polyamidoamine dendrimers, and subsequently immobilized the DENs onto ITO surfaces via electrooxidative grafting of the terminal amines of dendrimers to the surfaces. The resulting DEN-modified ITOs preserved good optical transparency of ITO, and exhibited highly catalyzed electrochemical oxidation of Ru(bpy)32+/TPrA, leading to significantly increased ECL emission. Especially, the Pt DEN-modified ITO electrode provides negligible transmittance drop, i.e. only ~1.99% over the entire visible region, and exhibited not only much enhanced (i.e. ~213-fold increase compared to ECL obtained from bare ITO), but also stable ECL emission under consecutive potential scans from 0.00 to 1.10 V for 10 cycles, which allowed ~329 times more sensitive ECL-based analysis of nicotine using the Pt DEN-modified ITO compared with the use of bare ITO.
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