Relevant bibliographies by topics / Microelectrode based scanning voltammetric detector

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Academic literature on the topic 'Microelectrode based scanning voltammetric detector'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Microelectrode based scanning voltammetric detector"

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Tait, Russel J., Alan M. Bond, Barrie C. Finnin, and Barry L. Reed. "Rapid scanning voltammetry under steady-state conditions in a flow through thin layer cell with a microelectrode." Collection of Czechoslovak Chemical Communications 56, no. 1 (1991): 192–205. http://dx.doi.org/10.1135/cccc19910192.

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A microelectrode based detector system has been developed for measurement of steady state voltammetric curves in flowing solutions. Two microprocessors operating in parallel allow the direct transfer of collected data to a floppy diskette. Long term experiments can then be performed, with individual voltammograms being rapidly obtained, recorded and stored. The system can be used with scan rates up to 10 V s-1 and with 1 mV resolution over a potential range of 2.5 V. When a 10 μm diameter micro-disk platinum electrode serves as the working electrode, rapid scan voltammetry (scan rate 1 to 10 V s-1) can be undertaken under steady state conditions for reversible processes with a flow rate in the range of 1 to 3 ml min-1 as evidenced by the observation of sigmoidal rather than the peak shaped curves obtained with previously described rapid scan systems. That is, complete voltammograms can be obtained with minimal distortion due to uncompensated resistance and charging current which is not the case when conventionally sized electrodes are used or when microelectrodes are used at excessively high scan rates where linear diffusion terms become important. The working microelectrodes were developed to suit a conventional thin-layer cell design and therefore permit ready adaptation to existing flow through electrochemical detection systems. The detection limits for the determination of ferrocene in methanol at flow rates up to 3 ml min-1 were 10-6 mol dm-3 after background correction, and the response was found to be linear over the concentration range 10-3 to 10-6 mol dm-3. Three-dimensional methods of data treatment and contour plots can be used to interpret results obtained from steady state or near steady state voltammograms of incompletely resolved chromatograms as demonstrated with range of biologically important compounds.
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Motoc, Sorina, Carmen Cretu, Otilia Costisor, Anamaria Baciu, Florica Manea, and Elisabeta I. Szerb. "Cu(I) Coordination Complex Precursor for Randomized CuOx Microarray Loaded on Carbon Nanofiber with Excellent Electrocatalytic Performance for Electrochemical Glucose Detection." Sensors 19, no. 24 (December 4, 2019): 5353. http://dx.doi.org/10.3390/s19245353.

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A homoleptic ionic Cu(I) coordination complex that was based on 2,2′-biquinoline ligand functionalized with long alkyl chains (Cu(I)–C18) was used as a precursor to modify a carbon nanofiber paste electrode (Cu–C18/CNF). Randomized copper oxide microelectrode arrays dispersed within carbon nanofiber paste (CuOx/CNF) were obtained by electrochemical treatment of Cu–C18/CNF while using cyclic voltammetry (CV). The CuOx/CNF exhibited high electrocatalytic activity towards glucose oxidation at +0.6 V and +1.2 V vs. Ag/AgCl. Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) characterized the electrodes composition. Cyclic voltammetry (CV), square wave-voltammetry (SWV), and multiple-pulsed amperometry (MPA) techniques provided optimized conditions for glucose oxidation and detection. A preconcentration step that involved 10 minutes accumulation at open circuit potential before SWV running led to the lowest limit of detection and the highest sensitivity for glucose detection (5419.77 µA·mM−1·cm−2 at + 1.1 V vs. Ag/AgCl) vs. Cu-based electrodes reported to date in literature.
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Manciu, Felicia S., Yoonbae Oh, Abhijeet Barath, Aaron E. Rusheen, Abbas Z. Kouzani, Deidra Hodges, Jose Guerrero, Jonathan Tomshine, Kendall H. Lee, and Kevin E. Bennet. "Analysis of Carbon-Based Microelectrodes for Neurochemical Sensing." Materials 12, no. 19 (September 28, 2019): 3186. http://dx.doi.org/10.3390/ma12193186.

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The comprehensive microscopic, spectroscopic, and in vitro voltammetric analysis presented in this work, which builds on the well-studied properties of carbon-based materials, facilitates potential ways for improvement of carbon fiber microelectrodes (CFMs) for neuroscience applications. Investigations by both, scanning electron microscopy (SEM) and confocal Raman spectroscopy, confirm a higher degree of structural ordering for the fibers exposed to carbonization temperatures. An evident correlation is also identified between the extent of structural defects observed from SEM and Raman results with the CFM electrochemical performance for dopamine detection. To improve CFM physico-chemical surface stability and increase its mechanical resistance to the induced compressive stress during anticipated in vivo tissue penetration, successful coating of the carbon fiber with boron-doped diamond (BDD) is also performed and microspectroscopically analyzed here. The absence of spectral shifts of the diamond Raman vibrational signature verifies that the growth of an unstrained BDD thin film was achieved. Although more work needs to be done to identify optimal parameter values for improved BDD deposition, this study serves as a demonstration of foundational technology for the development of more sensitive electrochemical sensors, that may have been impractical previously for clinical applications, due to limitations in either safety or performance.
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Tait, Russell J., Barrie C. Finnin, Barry L. Reed, and Alan M. Bond. "A study of irreversible electrode processes under steady-state flowing solution conditions with a microelectrode based scanning electrochemical detector." Analytica Chimica Acta 324, no. 1 (April 1996): 1–11. http://dx.doi.org/10.1016/0003-2670(95)00601-x.

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5

Tait, Russell J., Peter C. Bury, Barrie C. Finnin, Barry L. Reed, and Alan M. Bond. "Achievement of the analytically ideal steady-state response at a microelectrode-based scanning electrochemical detector under flow injection analysis and normal-phase chromatography conditions." Analytical Chemistry 65, no. 22 (November 15, 1993): 3252–57. http://dx.doi.org/10.1021/ac00070a014.

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6

Charithra, Madikeri Manjunath, Jamballi Gangadharappa Gowda Manjunatha, and Chenthattil Raril. "Surfactant Modified Graphite Paste Electrode as an Electrochemical Sensor for the Enhanced Voltammetric Detection of Estriol with Dopamine and Uric acid." Advanced Pharmaceutical Bulletin 10, no. 2 (February 18, 2020): 247–53. http://dx.doi.org/10.34172/apb.2020.029.

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Purpose: Estriol (ERL) is a type of hormone among the groups of estrogen hormone that was detected through the voltammetric technique by constructing an electrochemical sensor based on the octoxynol-9 modified graphite paste electrode (OXL-9MGPE). Methods: Using the strategy of cyclic voltammetry (CV) and differential pulse voltammetry (DPV) with a bare graphite paste electrode (BGPE) immobilized with OXL-9, ERL electro-oxidation has been assessed in 0.2 M phosphate buffer solution (PBS) of pH 6.0. The fabricated electrode has substantial electrochemical sensing efficiency, and the ERL oxidation at the OXL-9MGPE was the irreversible process. The surface morphological characteristics of BGPE and OXL-9MGPE were differentiated with the help of field emission scanning electron microscopy (FE-SEM). Results: The impact of various factors such as scan rate, pH, reproducibility, repeatability, and stability on the electro-oxidation of ERL was evaluated. Techniques of CV and DPV were utilized to determine ERL, dopamine (DAN), and uric acid (URA) simultaneously with the projected sensor. The peak current was varied with ERL concentration in the range from 4×10-5 to 1.2×10-4 M at OXL-9MGPE. From this, the detection limit 1.4×10-6 M and limit of quantification (LOQ) 4.7×10-6 M have been attained. Conclusion: As a result, OXL-9MGPE was successfully achieved as an electrochemical detector for the electro analysis of ERL via the CV technique.
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Salakhova, Elza A., Dilgam B. Tagiyev, Parvana E. Kalantarova, Kamala F. Ibrahimova, Mamedali A. Ramazanov, and Zohrab A. Agamaliyev. "ELECTROCHEMICAL OBTAINING AND MORPHOLOGY OF ALLOYS’ NANOCOVERINGS IN SYSTEM Re-Сu-Se." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 2 (January 29, 2021): 34–40. http://dx.doi.org/10.6060/ivkkt.20216402.6298.

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Electrochemical obtaining of nano-coatings in the system Re-Cu-Se on platinum electrode during voltammetric cycling was studied. The research was carried out using sulphate solution containing selenium dioxide, potassium perrenate and copper chloride. For obtaining nano coatings in the Re-Cu-Se system, we used an electrolyte of the following composition (mol/l): 6.9 ∙ 10-4 – 6.9 ∙ 10-3 KReO4 + 9 ∙ 10-4 – 1.8 ∙ 10-2 SeO2 + 6 ∙ 10-4 – 1.2 ∙ 10-2 CuCl2 ∙ 2H2O +2 H2SO4, t = 80 ºC; V = 0.005VS-1; pH = 0.1, electrode - Pt. Based on the studying of the volt-ampere dependences during the joint electroreduction of rhenium (VII), selenium (IV) and copper (II) ions from sulfate electrolytes on a PT electrode, the conditions for the deposition of alloys nanocoatings in the Re-Cu-Se system were established. To study the morphology of films on platinum and copper substrates, the electrode surface was studied using a JEOL JSM7600F scanning electron microscope at various magnifications, and was accordingly subjected to elemental analysis using an Oxford X-MAX 50 detector. The sample has been scanned in the mode of secondary electrons at an accelerating voltage ~ 15 keV. It has been found that agglomerates are observed on the electrode surface, mainly consisting of sphere-shaped particles with an average size of ~ 20-25 nm. The spectrum of characteristic X-ray radiation indicates the presence of these components of the system, allows quantitative analysis of samples. Based on the presented distribution diagram by weight percent, the content of system components is represented by the following ratio: Re-12%, Cu-5%, Se-10%. The presence of characteristic peaks of carbon and oxygen in the spectrum is explained by residual phenomena during obtaining.
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Zouaoui, Fares, Saliha Bourouina-Bacha, Mustapha Bourouina, Albert Alcacer, Joan Bausells, Nicole Jaffrezic-Renault, Nadia Zine, and Abdelhamid Errachid. "Electrochemical Impedance Spectroscopy Microsensor Based on Molecularly Imprinted Chitosan Film Grafted on a 4-Aminophenylacetic Acid (CMA) Modified Gold Electrode, for the Sensitive Detection of Glyphosate." Frontiers in Chemistry 9 (May 7, 2021). http://dx.doi.org/10.3389/fchem.2021.621057.

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A novel electrochemical impedance spectroscopy (EIS) microsensor was implemented for the dosage of traces of glyphosate, in real and synthetic water samples. Molecularly imprinted chitosan was covalently immobilized on the surface of the microelectrode previously modified with 4-aminophenylacetic acid (CMA). The characterization of the resulting microelectrodes was carried out by using cyclic voltammetry measurement (CV), scanning electron microscopy (SEM), and electrochemical impedance spectrometry (EIS). EIS responses of the CS-MIPs/CMA/Au microsensor toward GLY was well-proportional to the concentration in the range from 0.31 × 10−9 to 50 × 10−6 mg/mL indicating a good correlation. The detection limit of GLY was 1 fg/mL (S/N = 3). Moreover, this microsensor showed good reproducibility and repeatability, high selectivity, and can be used for the detection of GLY in river water.
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Ibarlucea, Bergoi, Arnau Pérez Roig, Dmitry Belyaev, Larysa Baraban, and Gianaurelio Cuniberti. "Electrochemical detection of ascorbic acid in artificial sweat using a flexible alginate/CuO-modified electrode." Microchimica Acta 187, no. 9 (August 27, 2020). http://dx.doi.org/10.1007/s00604-020-04510-5.

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Abstract A flexible sensor is presented for electrochemical detection of ascorbic acid in sweat based on single-step modified gold microelectrodes. The modification consists of electrodeposition of alginate membrane with trapped CuO nanoparticles. The electrodes are fabricated at a thin polyimide support and the soft nature of the membrane can withstand mechanical stress beyond requirements for skin monitoring. After characterization of the membrane via optical and scanning electron microscopy and cyclic voltammetry, the oxidative properties of CuO are exploited toward ascorbic acid for amperometric measurement at micromolar levels in neutral buffer and acidic artificial sweat, at ultralow applied potential (− 5 mV vs. Au pseudo-reference electrode). Alternatively, measurement of the horizontal shift of redox peaks by cyclic voltammetry is also possible. Obtaining a limit of detection of 1.97 μM, sensitivity of 0.103 V log (μM)−1 of peak shift, and linear range of 10–150 μM, the effect of possible interfering species present in sweat is minimized, with no observable cross-reaction, thus maintaining a high degree of selectivity despite the absence of enzymes in the fabrication scheme. With a lateral flow approach for sample delivery, repeated measurements show recovery in few seconds, with relative standard deviation of about 20%, which can serve to detect increased loss or absence of vitamin, and yet be improved in future by optimized device designs. This sensor is envisioned as a promising component of wearable devices for e.g. non-invasive monitoring of micronutrient loss through sweat, comprising features of light weight, low cost, and easy fabrication needed for such application.
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Dissertations / Theses on the topic "Microelectrode based scanning voltammetric detector"

1

Tait, Russell John, and mikewood@deakin edu au. "Development and application of a microelectrode based scanning voltammetric detector." Deakin University. School of Physical and Chemical Sciences, 1991. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20060720.100447.

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A large part of the work presented in this thesis describes the development and use of a novel electrochemical detector designed to allow the electrochemical characterisation of compounds in flowing solution by means of cyclic voltammetry. The detector was microprocessor controlled, which provides digital generation of the potential waveform and collection of data for subsequent analysis. Microdisk working electrodes are employed to permit both thermodynamic and kinetically controlled processes to be studied under steady-state conditions in flowing solutions without the distortion or hysteresis normally encountered with larger sized electrodes. The effect of electrode size, potential scan rate, and solution flow rate are studied extensively with the oxidation of ferrocene used as an example of a thermodynamically controlled process and a series of catecholamines as examples of a kinetically controlled process. The performance of the detector was best demonstrated when used as a HPLC post-column detector. The 3-dimensional chromatovoltammograms obtained allow on-line characterisation of each fraction as it elutes from the column. The rest of the work presented in this thesis involves the study of the oxidative degradation pathway of dithranol. The oxidative pathway was shown to involve a complex free radical mechanism, dependent on the presence of both oxygen and, in particular light. The pathway is further complicated by the fact that dithranol may exist in either a keto or enol form, the enol being most susceptible to oxidation. A likely mechanism is proposed from studies performed with cyclic voltammetry and controlled potential electrolysis, then defined by subsequent kinetic studies.
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