Carbon paste-based ion-selective dual function microelectrodes for SECM measurements

Csóka, Balázs; Mekhalif, Zineb

doi:10.1016/j.electacta.2008.10.067

Cited by 19 publications

(21 citation statements)

References 40 publications

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“…The emf values measured for 25 μm diameter electrodes were plotted against activity considering the extended Debye-Hückel equation as shown in Figure 1. The slope of the calibration plot of an unconditioned electrode is strongly superNernstian in the whole range, with the slope of 112 mV/decade, and a lower detection limit of 3×10 -6 M. This is a similar observation to our recently published one, 29 which was measured by using carbon paste based microelectrodes without PEDOT contact. The supposed reason for the high slope is the adsorption of the metal ions on the surface of carbon paste material.…”

Section: Calibrationsupporting

confidence: 75%

“…At -0.6 V (vs. Ag|AgCl) the oxygen reduction can be measured easily, however by polarizing the electrode negatively it is forcing the HCF ions to leave the polymer layer 18,31,33 and copper ions are collected at the outer surface of the carbon paste causing decreased sensitivity, as it had been already published. 29 The diffusion of HCF, however, towards the solution is hindered by the CP. During a forthcoming positive polarization the HCF can be reoxidized and forced to diffuse back to the PEDOT matrix.…”

Section: Calibrationmentioning

confidence: 99%

“…29 Only a short outline is given here. The electrode fabrication process was begun with the construction of standard Pt disk microelectrodes on the usual way: 5 and 25 μm Pt wires were incorporated into the soft glass capillaries, and then by polishing them to have a conventional metal-glass microelectrode tip with a metal-to-glass ratio 1:10 in diameter.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…31 The sensing layer was prepared from tetraethylthiuram-disulfide containing carbon paste with paraffin oil carrier as it was already published. 29 Thiuram containing paste (w = 10 %) was selected to use as sensing material (CP10), and it was top filled into the cavity, directly on the PEDOT/HFC layer. As the last step, the carbon paste filled microelectrode (μCP) was tested electrochemically by running CVs in 1 mM ferrocenemethanol solution.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Recessed microdisk electrode was fabricated and used for potentiometric as well as amperometric applications of the Scanning Electrochemical Microscope in our previous publication. 29 The big advantage of the new type electrode is the capability of using it in both modes of SECM operations: in potentiometry it acts as Cu 2+ ion-selective microsensor while in amperometry it was used in feed-back mode to set the tip-to-target distance. In order to enhance the analytical performance, especially in potentiometric mode, the electrode design was modified by incorporating a conducting polymer layer.…”

Section: Introductionmentioning

confidence: 99%

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PEDOT Modified Carbon Paste Microelectrodes for Scanning Electrochemical Microscopy

Csóka¹,

Mekhalif²

2011

Croat. Chem. Acta

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Abstract. Only one measuring tip was used in three different modes of operation of the Scanning Electrochemical Microscope (feed-back mode, generation-collection mode, potentiometry) to collect chemical information about copper targets. The tip was formed from 5 and 25 μm diameter conventional platinum microdisk electrode by etching a cavity, then electrochemically depositing poly(3,4-ethylenedioxythiophene) (PEDOT) layer doped with hexacyanoferrate and finally filling with modified carbon paste based Cu 2+ sensing layer. The preparation and electrochemical working parameters of this kind of solidcontact microelectrodes are discussed as well as SECM applications for copper detection is reported.

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Section: Calibrationsupporting

confidence: 75%

Section: Calibrationmentioning

confidence: 99%

Section: Electrode Preparationmentioning

confidence: 99%

Section: Electrode Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PEDOT Modified Carbon Paste Microelectrodes for Scanning Electrochemical Microscopy

Csóka¹,

Mekhalif²

2011

Croat. Chem. Acta

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Simultaneous Visualization of Surface Topography and Concentration Field by Means of Scanning Electrochemical Microscopy Using a Single Electrochemical Probe and Impedance Spectroscopy

2011

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Scanning electrochemical microscopy visualizes concentration profiles. To determine the location of the probe relative to topographical features of the substrate, knowledge of the probe-to-sample distance at each probe position is required. The use of electrochemical impedance spectroscopy for obtaining information on the substrate-to-probe distance and on the concentration of interest using the electrochemical probe alone is suggested. By tuning the frequencies of interrogation, the probe-to-substrate distance can be derived followed by interrogation of processes that carry information on concentration at lower frequencies. These processes may include charge-transfer relaxation, diffusional relaxation at the electrode, and open-circuit potential at zero frequency. A potentiometric chloride sensing microprobe is used herein to reconstruct both topography and the concentration field at a microscopic diffusional source of chloride.

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New Screen‐Printed Ion‐Selective Electrodes for Potentiometric Titration of Cetyltrimethylammonium Bromide in Different Civilic Media

et al. 2010

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The performance of home-made printed carbon ink in the fabrication of a simple screen-printed carbon paste electrodes (SPCPEs) was studied. Such electrodes are applied for the potentiometric titration and hence determination of cetyltrimethylammonium bromide (CTAB) in different pharmaceuticals and water samples. The performances of the new screen printed electrodes towards CTAB are compared with those for carbon paste, coated-wire, coated graphite and polyvinyl chloride electrodes. SPCPEs have been successfully used for the potentiometric titration of CTAB in the analytical grad solutions, with a potential jump amounts to 1050 mV. The effect of plasticizer type, carbon content, binding materials, printing ink formulation, response time and printing process are optimized. The method is applied for pharmaceutical preparations with a percentage recovery of 99.20 % and RSD = 0.45. The electrodes passes a near-Nernstian cationic slope of 58.70 AE 1.3 and 56.32 AE 2.4 mV and lower detection limit of 6.8 10 À7and 5.80 10 À7 M with a reproducibility of 0.145 and 3.25 % and response time of about 3 s and exhibit adequate shelf-life of 6 and 2 months for SPCPE and CPE, respectively. The frequently used CTAB of analytical and technical grade as well as different water samples has been successfully titrated and the results obtained agreed with those obtained with commercial electrode and standard two phase titration method. The sensitivity of the proposed method is comparable with the official method indicating its possibility to be used in field measurements.

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Carbon paste-based ion-selective dual function microelectrodes for SECM measurements

Cited by 19 publications

References 40 publications

PEDOT Modified Carbon Paste Microelectrodes for Scanning Electrochemical Microscopy

PEDOT Modified Carbon Paste Microelectrodes for Scanning Electrochemical Microscopy

Simultaneous Visualization of Surface Topography and Concentration Field by Means of Scanning Electrochemical Microscopy Using a Single Electrochemical Probe and Impedance Spectroscopy

New Screen‐Printed Ion‐Selective Electrodes for Potentiometric Titration of Cetyltrimethylammonium Bromide in Different Civilic Media

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