Papers by Keyword: Ru(bpy)32+

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Authors: Sang Ho Kim, Ji Hoon Oh, Bong Yoo, Da Jung Jung, Ming Hua Piao, Seong Ho Choi
Abstract: Tris(2,2’-bipyridyl)ruthenium (II) (Ru(bpy)3 2+) electrogerated chemiluminescence (ECL) sensor was fabricated by immobilization of Ru(bpy)3 2+) complex on the functionalized MWCNT-Nafion composite film coated on surface of glass carbon electrode. The functionalized MWCNT was prepared by coating of polythiophene (PTh), polyaniline (PANI), and poly(3-thiophene acetic acid) [P(3-TAA)] on the surface of the carboxylic acid-modified MWCNT. The sensitivity and reproducibility of the prepared ECL sensor to tripropylamine (TPA) was evaluated. As results, the carboxylic acid-modified MWNT composite electrode was high sensitivity and good reproducibility than that of other functionalized MWNT composite electrode.
Authors: Lu Yang Song, Kotaro Takahashi, Takeshi Higuchi, Tadahiro Aita
Abstract: In this work, photoluminescent properties of Ru (bpy)32+ incorporated in cellulose nanofiber (CNF) film was investigated by comparing with those in polyvinyl alcohol (PVA) and polyacrylic acid (PAA) films. In the polymer films, the luminescence intensity of Ru (bpy)32+ was high and λmax of luminescence spectra was blue-shifted compared with those in aqueous solution. The high luminescence intensity was also observed in cellulose nanofiber (CNF) films but the spectrum was red-shifted. Luminescence decay measurement showed that the decays in polymer films were exponential and the lifetimes were far longer than that in aqueous solution. On the other hand, in CNF films, the decays were composed of fast and slow ones. The luminescence properties of Ru (bpy)32+ in CNF films were discussed based on the stabilization of excited state and the dispersibility of Ru (bpy)32+ in the films.
Authors: Wei Ling Guo, En Zhong Li, Hai Dou Wang
Abstract: MnO2 nano-materials can remarkably catalyze the electrochemical reduction reaction of O2, so MnO2 nano-materials can be used as catalysts for electrogenerated chemiluminescence (ECL) of Ru(bpy)32+ in this paper. As a result, a novel cathodic ECL of Ru(bpy)32+ at positive potential of +0.4 V (vs. Ag/AgCl) was triggered by reactive oxygen species (HO2•- or OH•-) on an in situ electrodeposited MnO2 nano-structured electrode. Finally, catalytic mechanism of MnO2 nano-materials is deduced and provides a theoretical basis for preparing novel ECL Sensor with high sensitivity.
Authors: Wei Ling Guo, En Zhong Li, Da Xiang Yang, Hao Chen, Hai Dou Wang, Bin Shi Xu
Abstract: Carbon nanotubes (CNTs) have the ability to promote electron transfer reaction when used as electrode materials in electrochemical reaction owing to their high electronic conductivity. The modified glassy electrode coated with multi-walled nanotubes (MWCNTs/GC) is used to detect Electrogenerated Chemiluminescence (ECL) of Ru(bpy)32+ aqueous solution. When the applied potential on the working electrode is at at positive potential of +0.3 V (s. Ag/AgCl), a strong cathodic ECL of Ru(bpy)32+ is observed。This property of MWCNTs/GC is used to examine dopamine (DA) in solution.
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