Journal
ANALYTICAL CHEMISTRY
Volume 86, Issue 3, Pages 1654-1660Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac403415m
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Funding
- National Research Foundation of Korea
- Ministry of Science, ICT and Future Planning [2012R1A1A1014408]
- National Research Foundation of Korea [2012R1A1A1014408] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Here, we report highly enhanced stable electrogenerated chemiluminescence (ECL) of Ru(bpy)(3)(2+) (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 poly(amido amine) 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)(3)(2+)/TPrA, leading to significantly increased ECL emission. Especially, the Pt DEN-modified ITO electrode provides negligible transmittance drop, i.e., only similar to 1.99% over the entire visible region, and exhibited not only much enhanced (i.e., similar to 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 similar to 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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