[Ru(dpp)3][(4-Clph)4B]2Nanoislands Directly Assembled on an ITO Electrode Surface and Its Electrogenerated Chemiluminescence

Langmuir ◽  
2009 ◽  
Vol 25 (2) ◽  
pp. 1253-1258 ◽  
Author(s):  
Ying Chen ◽  
Jianfei Mao ◽  
Chunhua Liu ◽  
Hongyan Yuan ◽  
Dan Xiao ◽  
...  
Keyword(s):  
Electrode Surface ◽  
Electrogenerated Chemiluminescence ◽  
Ito Electrode

Electrogenerated Chemiluminescence and Sensory Property of Rubrene Microparticles Immobilized on ITO Electrode

2012 ◽  
Vol 535-537 ◽  
pp. 1262-1265
Author(s):  
De Bao Xiao ◽  
Li Li Liu ◽  
Zhan Jun Gu
Keyword(s):  
Methylene Blue ◽  
Organic Molecule ◽  
Solvent Evaporation ◽  
Electrogenerated Chemiluminescence ◽  
Evaporation Process ◽  
Sensory Property ◽  
Ito Electrode ◽  
Solvent Evaporation Process

We have prepared the rubrene microparticles through a solvent evaporation process, during which the as-prepared microparticles were immobilized directly onto ITO electrode. It is found that the rubrene microparticles exhibit strong electrochemiluminescent emission in the presence of the co-reactant tripropylamine. The rubrene microparticles can be employed as an electrochemiluminescent sensor, chemically and biologically, for detection of methylene blue and glucose. This work demonstrates that the microstructured architecture of electroluminescent organic molecule is applicable as emitter in electrochemiluminescent sensor.

scholarly journals A Comparison of Commercially Available Screen-Printed Electrodes for Electrogenerated Chemiluminescence Applications

2021 ◽  
Vol 8 ◽  
Author(s):  
Emily Kerr ◽  
Richard Alexander ◽  
Paul S. Francis ◽  
Rosanne M. Guijt ◽  
Gregory J. Barbante ◽  
...  
Keyword(s):  
Electrode Surface ◽  
Homogeneous Solution ◽  
Electrogenerated Chemiluminescence ◽  
Platinum Electrodes ◽  
Oxide Formation ◽  
Detection Systems ◽  
Screen Printed Electrodes ◽  
Ordered Mesoporous ◽  
Surface Oxide Formation ◽  
Screen Printed

We examined a series of commercially available screen-printed electrodes (SPEs) for their suitability for electrochemical and electrogenerated chemiluminescence (ECL) detection systems. Using cyclic voltammetry with both a homogeneous solution-based and a heterogeneous bead-based ECL assay format, the most intense ECL signals were observed from unmodified carbon-based SPEs. Three commercially available varieties were tested, with Zensor outperforming DropSens and Kanichi in terms of sensitivity. The incorporation of nanomaterials in the electrode did not significantly enhance the ECL intensity under the conditions used in this evaluation (such as gold nanoparticles 19%, carbon nanotubes 45%, carbon nanofibers 21%, graphene 48%, and ordered mesoporous carbon 21% compared to the ECL intensity of unmodified Zensor carbon electrode). Platinum and gold SPEs exhibited poor relative ECL intensities (16% and 10%) when compared to carbonaceous materials, due to their high rates of surface oxide formation and inefficient oxidation of tri-n-propylamine (TPrA). However, the ECL signal at platinum electrodes can be increased ∼3-fold with the addition of a surfactant, which enhanced TPrA oxidation due to increasing the hydrophobicity of the electrode surface. Our results also demonstrate that each SPE should only be used once, as we observed a significant change in ECL intensity over repeated CV scans and SPEs cannot be mechanically polished to refresh the electrode surface.

scholarly journals ITO ELECTRODES MODIFIED WITH MnO2/SiO2 FOR THE DETERMINATION OF HYDROGEN PEROXIDE

2018 ◽  
pp. 39-42
Author(s):  
A. Kovalyk ◽  
O. Tananaiko
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Detection Limit ◽  
Manganese Dioxide ◽  
Modified Electrode ◽  
Electrode Surface ◽  
Electrochemical Characteristics ◽  
Ito Electrode ◽  
Mno2 Nanoparticles ◽  
H2o2 Determination

Nanostructured transition metal oxide nanoparticles possess a catalytic activity to hydrogen peroxide. Manganese dioxide particles are one of the promising and available modificators of the electrode surface. Nanostructured MnO2 deposited onto the surface of the electrode enhances the electron transport from the H2O2 molecule to the surface. Thus selectivity and sensitivity of H2O2 detection can be improved. There are a lot of different methods of the impregnation of manganese dioxide particles onto electrode surface. An electrophoretic deposition is one of the most simple and rapid. By adjusting the electrodeposition parameters, particles of different sizes or films can be obtained. A simple and novel hydrogen peroxide sensor based on layer-by-layer assembly of MnO2 nanoparticles and SiO2 film on the ITO electrode was developed. For this purpose MnO2 nanoparticles were electrodeposited on the surface of ITO electrode from MnSO4/CH3COOK solution. The electrochemical characteristics of the modified electrodes were investigated by cyclic voltammetry.The presence of MnO2 on the surface of modified electrode was indicated by the appearance of clear oxidation-reduction peaks of Mn(IV)/Mn(III,II) at E=0.65 V in the electrolyte solution in contrast to unmodified electrode. Optimization of measurement parameters such as the amount of MnO2, applied potential and pH value were studied in details. Under the optimum conditions, the calibration curve for H2O2 determination using modified electrode was linear in the range from 1×10−4 to 1×10−3 mol/dm3 with a detection limit of 0.09×10−4 mol/dm3 (S/N = 3). The linear rang for non-modified electrode was from 1×10−3 to 1×10−2 mol/dm3 with a detection limit of 1.8×10−4 mol/dm3 (S/N = 3). The modified ITO electrode was characterized by higher current than non modified ITO as a result of increasing of electroactive surface area and catalytic effect of electrodeposited MnO2.For the stabilization of MnO2 particles and protection of the electrode surface from impurities, the ITO/MnO2 was covered by thin silica film. The selectivity of H2O2 determination at ITO modified with MnO2/SiO2 was better than at ITO especially in the presence of ascorbic acid which is oxidized at the same potential as H2O2. The oxidation current of ascorbic acid was much higher than H2O2 at nonmodified ITO in contrast to ITO modified with MnO2/SiO2. The developed ITO electrode modified with MnO2/SiO2 is a perspective element of amperometric sensor for the detection of hydrogen peroxide.

scholarly journals Different Electrochemical Sensor Designs Based on Diazonium Salts and Gold Nanoparticles for Pico Molar Detection of Metals

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3903 ◽  
Author(s):  
Zouhair Ait-Touchente ◽  
Sana Falah ◽  
Erika Scavetta ◽  
Mohamed M. Chehimi ◽  
Rachid Touzani ◽  
...  
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Indium Tin Oxide ◽  
Electrode Surface ◽  
Diazonium Salt ◽  
High Sensitivity ◽  
Diazonium Salts ◽  
Hybrid Nanomaterial ◽  
Ito Electrode ◽  
Hybrid Thin Films

We report a comparison of sensors’ performance of different hybrid nanomaterial architectures modifying an indium tin oxide (ITO) electrode surface. Diazonium salts and gold nanoparticles (AuNPs) were used as building units to design hybrid thin films of successive layers on the ITO electrode surface. Different architectures of hybrid thin films were prepared and characterized with different techniques, such as TEM, FEG-SEM, XPS, and EIS. The prepared electrodes were used to fabricate sensors for heavy metal detection and their performances were investigated using the square wave voltammetry (SWV) method. The comparison of the obtained results shows that the deposition of AuNPs on the ITO surface, and their subsequent functionalization by diazonium salt, is the best performing architecture achieving a high sensitivity in terms of the lower detection limit of pico molar.

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