Deactivation of the ruthenium excited state by enhanced homogeneous charge transport: Implications for electrochemiluminescent thin film sensors

O’Reilly, Emmet J.; Keyes, Tia E.; Forster, Robert J.; Dennany, Lynn

doi:10.1016/j.elecom.2017.11.020

Cited by 9 publications

(10 citation statements)

References 27 publications

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“…27−29 However, this behavior is consistent with semi-infinite linear diffusion and the homogeneous charge transfer diffusion coefficient, D CT , is in good agreement with those values previously reported. 26,30 In contrast to previous studies, 6,[18][19][20]22 atropine displayed no distinctive electrochemical behavior at the concentrations of interest for the unmodified carbon screen printed electrodes across this potential range, as shown in Figure 1b. However, at higher concentrations, an anodic peak at ∼0.89 V was observed (see Figure S1).…”

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confidence: 92%

Utilization of an Electrochemiluminescence Sensor for Atropine Determination in Complex Matrices

et al. 2019

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A major challenge within forensic science is the development of accurate and robust methodologies that can be utilized on-site for detection at crime scenes and can be used for analyzing multiple sample types. The recent expansion of electrochemical sensors to tackle this hurdle requires sensors that can undergo analysis without any pretreatment. Given the vast array of samples that are submitted for forensic analysis, this can pose a major challenge for all electrochemical sensors, including electrochemiluminescent (ECL)-based sensors. Within this contribution, we demonstrate the capacity for an ECL-based sensor to address this challenge and it is potential to detect and quantify atropine from a wide range of samples directly from herbal material to spiked solutions. This portable platform demonstrates satisfactory analytical parameters with linearity across a concentration range of 0.75 to 100 μM, reproducibility of 3.0%, repeatability of 9.2%, and a detection limit of ∼0.75 μM. The sensor displays good selectivity toward alkaloid species and, in particular, the hallucinogenic tropane alkaloid functionality within complex matrices. This portable sensor provides rapid detection alongside low cost and operational simplicity, thus, providing a basis for the exploitation of ECL-based sensors within the forensic arena.

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confidence: 92%

Utilization of an Electrochemiluminescence Sensor for Atropine Determination in Complex Matrices

et al. 2019

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“…Ruthenium(II)‐containing metallopolymers represents the class of ECL‐active metallopolymers that has been most investigated to date . In particular, the ECL properties of [Ru(bpy) 2 (PVP) 10 ] 2+ have been studied in detail in the presence of oxalate and TPrA as co‐reactant.…”

Section: Classes Of Ecl‐active Metallopolymerssupporting

confidence: 65%

Metallopolymers as Nanostructured Solid‐State Platforms for Electrochemiluminescence Applications

2019

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Electrochemiluminescence (ECL) is the process of light emission arising from an electrochemically generated excited state. ECL has been demonstrated to be a powerful tool for bioanalysis, in particular when phosphorescent transition metal complexes (TMCs) are used as emitters. Apart from molecular luminophores, there has been increasing interest in the use of both non‐conjugated and π‐conjugated metallopolymers over the last decade. Research efforts in this direction are driven by the appealing possibility to synergistically combine typical features of polymers, such as processability, with the enhanced photophysical and redox properties of several classes of TMCs. Indeed, solid‐state arrangements of ECL‐active metallopolymers enable their straightforward use as sensors with enhanced response. This concept article focuses on ECL‐active metallopolymers and their use in solid‐state platforms, providing a survey with relevant examples together with properties, mechanisms and proposed applications. Finally, the outlook for future applications across different research fields for these materials as well as their limitations for will be discussed.

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“…The oxidation peak observed for the SPCE/ZCNT 0.1 compared to the bare electrode is larger with a slight shift in the oxidation potential to 0.410 V versus Ag illustrating that the modified electrode enhances the electron transfer and peak currents of 5-HT similar to that reported for Fe 3 O 4 nanoparticle modified electrodes 19 . The slight reduction in oxidation potential observed, maybe due in part to better diffusion of the analyte through the more porous modifying layer or possibly a minor mediated oxidation by the modifying layer 17 , 74 – 76 . This peak can also be attributed to the irreversible oxidation of the hydroxyl group of the aromatic ring of the 5-HT involving 2 electrons, to form the final ketone product 20 , 77 , 78 .…”

Section: Resultsmentioning

confidence: 98%

Structural refinement and electrochemical properties of one dimensional (ZnO NRs)1−x(CNs)x functional hybrids for serotonin sensing studies

Mullani

Dhodamani

Shellikeri

et al. 2020

Sci Rep

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Herein, the efficient serotonin (5-HT) sensing studies have been conducted using the (ZnO NRs)1−x(CNs)x nanocomposites (NCs) having appropriate structural and electrochemical properties. Initially, the different compositions of ZnO nanorods (NRs), with varying content of carbon nanostructures (CNs=MWCNTs and RGO), are prepared using simple in-situ wet chemical method and thereafter these NCs have been characterized for physico-chemical properties in correlation to the 5-HT sensing activity. XRD Rietveld refinement studies reveal the hexagonal Wurtzite ZnO NRs oriented in (101) direction with space group ‘P63mc’ and both orientation as well as phase of ZnO NRs are also retained in the NCs due to the small content of CNs. The interconnectivity between the ZnO NRs with CNs through different functional moieties is also studied using FTIR analysis; while phases of the constituents are confirmed through Raman analysis. FESEM images of the bare/NCs show hexagonal shaped rods with higher aspect ratio (4.87) to that of others. BET analysis and EIS measurements reveal the higher surface area (97.895 m2/g), lower charge transfer resistance (16.2 kΩ) for the ZCNT 0.1 NCs to that of other NCs or bare material. Thereafter, the prepared NCs are deposited on the screen printed carbon electrode (SPCE) using chitosan as cross-linked agent for 5-HT sensing studies; conducted through cyclic voltammetry (CV) and square wave voltammetry (SWV) measurements. Among the various composites, ZCNT0.1 NCs based electrodes exhibit higher sensing activity towards 5-HT in accordance to its higher surface area, lower particle size and lower charge transfer resistance. SWV measurements provide a wide linear response range (7.5–300 μM); lower limit of detection (0.66 μM), excellent limit of quantification (2.19 μM) and good reproducibility to ZCNT 0.1 NCs as compared to others for 5-HT sensing studies.

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Deactivation of the ruthenium excited state by enhanced homogeneous charge transport: Implications for electrochemiluminescent thin film sensors

Cited by 9 publications

References 27 publications

Utilization of an Electrochemiluminescence Sensor for Atropine Determination in Complex Matrices

Utilization of an Electrochemiluminescence Sensor for Atropine Determination in Complex Matrices

Metallopolymers as Nanostructured Solid‐State Platforms for Electrochemiluminescence Applications

Structural refinement and electrochemical properties of one dimensional (ZnO NRs)1−x(CNs)x functional hybrids for serotonin sensing studies

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