Determination of solvation numbers of [RuII(bpy)3] and [RuII(tpy)2] functionalized-PAMAM dendrimers adsorbed onto platinum electrode surfaces

Takada, Keisuke; Abruña, Héctor D.

doi:10.1016/j.jelechem.2003.12.034

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…However, when these acetonitrile molecules are distributed over the surface of the dendrimer, the thickness of the solvation layer is estimated to be ~1 molecule. Similar results were obtained for the other dendrimer generations (26 ). If some specific interactions can be devised, the incorporation of such a large number of molecules could be used as a large amplification factor in analytical applications.…”

Section: +supporting

confidence: 78%

Peer Reviewed: Redox and Photoactive Dendrimers in Solution and on Surfaces

Abruña¹

2004

Anal. Chem.

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Because of the broad range of potential applications, interest in the preparation and characterization of redox and photoactive supramolecular structures, particularly dendrimers, is widespread. These applications include sensors, electrochromic and electroluminescent display devices, light harvesting, redox mediators, molecular electronics, and MRI materials. Dendrimers are highly branched globular molecules that consist of a core, selfreplicating branching units, and peripheral surface groups ( Figure 1); given their relatively high molecular weight, they can be considered "monodisperse polymers" (1-4). Dendrimers can be functionalized with reactive groups at the core, at the periphery, or throughout the entire structure and are ideal platforms for modification with redox and photoactive groups (5-8). We have synthesized and characterized dendrimers that are decorated on the periphery with redox and photoactive centers based on transition metal complexes and explored their electro-and photochemical properties in solution and on surfaces.

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Section: +supporting

confidence: 78%

Peer Reviewed: Redox and Photoactive Dendrimers in Solution and on Surfaces

Abruña¹

2004

Anal. Chem.

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“…In addition, the proposed biosensor exhibited higher sensitivity than chitosan-tyrosinase-GCE (Wang, Tan, Zhao, & Liu, 2008). Poly(amidoamine) (PAMAM), a highly branched dendritic macromolecule, possessing a unique surface with multiple chain ends, could also be used to modify electrode surface due to their good biocompatibility, highly geometric symmetry, chemical stability, controllable size, surface functionality and adequate functional groups for chemical fixation (Ca, Sun, & Cox, 2006;Li, Li, Wan, & Zhang, 2009;Takada & Abruña, 2004;Zeng et al, 2007). For example, Zeng et al fabricated a glucose biosensor based on immobilised horseradish peroxide and glucose oxidase onto multi-walled carbon nanotubes and PAMAM composite (Zeng et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Amperometric determination of bisphenol A in milk using PAMAM–Fe3O4 modified glassy carbon electrode

et al. 2011

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“…10,11 The signal-on biosensors based on the quenching effect, as a potential detection methodology, can avoid this disadvantage and will be valuable in both fundamental studies and commercial applications. 18,19 All these above provide a new viewpoint for us to synthesize a novel ECL matrices through combining SI-ATRP with Ru(bpy) 3 2+ -pendant PAMAM. The Chen group used the polymerase chain reaction (PCR) to increase the immobilization of ECL luminophores.…”

Section: Introductionmentioning

confidence: 99%

“…17 Meanwhile, PAMAM has been used as carrier of affinity ligands due to their unique properties, such as good water-solubility, chemical stability, and easily functionalized. 18,19 All these above provide a new viewpoint for us to synthesize a novel ECL matrices through combining SI-ATRP with Ru(bpy) 3 2+ -pendant PAMAM.…”

Section: Introductionmentioning

confidence: 99%

A signal-on electrochemiluminescence aptasensor based on the quenching effect of manganese dioxide for sensitive detection of carcinoembryonic antigen

Chai

Wang

et al. 2014

RSC Adv.

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We developed a signal-on electrochemiluminescence (ECL) aptasensor by using SI-ATRP to facilitate highdensity immobilization of luminophores and manganese dioxide-graphene (MnO 2 -GO) composite to indirect deactivate the excited state of Ru(dcbpy) 3 2+ for ultrasensitive detection of carcinoembryonic antigen (CEA). In this approach, manganese dioxide-graphene (MnO 2 -GO) composite served as an efficient quencher for indirect deactivating the excited state of Ru(dcbpy) 3 2+. Surface initiated atom transfer radical polymerization (SI-ATRP) was applied to functionalize multiwalled carbon nanotubes (MWNTs) with glycidyl methacrylate (GMA) as the functional monomer. A nanocomposite material of polyamidoamine (PAMAM) dendrimer encapsulated AuNPs was used as the carrier to combine Ru(dcbpy) 3 2+ and poly-GMA together for the synthesis of the ECL matrices. The prepared matrices were applied to bind amino-modified auxiliary probe I (A 1 ), which was partially complementary with the CEA aptamer. Meanwhile, the MnO 2 -GO composite was modified with another amino-modified CEA aptamer-partial-complementary auxiliary probe II (A 2 ). Through the hybridization of CEA aptamer with A 1 and A 2 , the quencher MnO 2 -GO composite was linked with the ECL matrices, by which a low ECL signal was detected (off-state). However, in the presence of CEA, the sandwich-like structure was destroyed because CEA would bind to its aptamer in lieu of the auxiliary probes, which resulted in a recovery of ECL signal (on-state). The proposed ECL aptasensor showed high sensitivity with a detection limit of 25.3 fg mL À1 and a wide linear range of 0.1 pg mL À1 to 20 ng mL À1 . Consequently, with the excellent sensitivity, stability and satisfying precision, the as-proposed strategy constitutes a promising detection technique for clinical diagnosis.

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Determination of solvation numbers of [RuII(bpy)3] and [RuII(tpy)2] functionalized-PAMAM dendrimers adsorbed onto platinum electrode surfaces

Cited by 11 publications

References 28 publications

Peer Reviewed: Redox and Photoactive Dendrimers in Solution and on Surfaces

Peer Reviewed: Redox and Photoactive Dendrimers in Solution and on Surfaces

Amperometric determination of bisphenol A in milk using PAMAM–Fe3O4 modified glassy carbon electrode

A signal-on electrochemiluminescence aptasensor based on the quenching effect of manganese dioxide for sensitive detection of carcinoembryonic antigen

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