TTF-TCNQ Solid Contact Layer in All-Solid-State Ion-Selective Electrodes for Potassium or Nitrate Determination

Solid-contact Ion Selective Electrodes (SC-ISEs) for the detection of lead are prepared on screen printed substrates in order to have low-cost and disposable sensors which may be useful in long-term environmental monitoring. It is shown that the materials used as solid contact layer, the deposition techniques and their thickness affect greatly the performances of the sensors. Poly(3-octylthiophene-2,5-diyl) (POT) and poly-3,4-ethylenedioxithiophene (PEDOT) are employed in this investigation. A trend showing an optimum is found for sensors prepared with POT as the batch reproducibility depends on the amount drop-cast, i.e., thickness. In case of PEDOT which is grown amperometrically the trend is more complex but an optimum for the batch reproducibility is again found depending on the current density. In the latter case, the film thickness and the overoxidation degree of the polymer probably concur in determining a more complex relationship.

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An all-solid-state NO3- ion-selective electrode with gold nanoparticles solid contact layer and molecularly imprinted polymer membrane

PLoS ONE ◽

10.1371/journal.pone.0240173 ◽

2020 ◽

Vol 15 (10) ◽

pp. e0240173

Author(s):

Lei Zhang ◽

Zhengying Wei ◽

Pengcheng Liu

Keyword(s):

Gold Nanoparticles ◽

Solid State ◽

Molecularly Imprinted Polymer ◽

Contact Layer ◽

Polymer Membrane ◽

Ion Selective Electrode ◽

Imprinted Polymer ◽

Solid Contact ◽

Selective Electrode ◽

Molecularly Imprinted

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All-Solid-State Ion-Selective Electrodes Based on Graphite Paste for Determination of Calcium(II) and Nitrate

International Journal of Chemistry ◽

10.5539/ijc.v11n2p156 ◽

2019 ◽

Vol 11 (2) ◽

pp. 156

Author(s):

Johannes Schwarz ◽

Ute Enseleit ◽

Kathrin Trommer ◽

Michael Mertig

Keyword(s):

Solid State ◽

Reference Method ◽

Well Water ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Diglycolic Acid ◽

Nitrate N ◽

Selective Membrane ◽

Pvc Membranes

Robust and easy-to-handle ion-selective electrodes in all-solid-state configurations based on graphite paste have been developed for applications in environmental samples. The electrode consists of different functional layers (graphite paste, conducting polymer, ion-selective membrane). The ion-selective compounds have been incorporated in polyvinylchloride (PVC) membranes. Polypyrrole (PPy) acts as a solid contact and an intermediate layer between the ion-selective membrane and the graphite paste. As ion-complexing compounds tridodecylmethylammonium nitrate (TDMA-NO3) for nitrate, N,N,N’,N’-tetra[cyclohexyl]diglycolic acid diamide and N,N-dicyclohexyl-N‘,N‘-dioctadecyl-diglycolic diamide for calcium(II) determinations have been used. The electrodes have been tested in drinking and well water samples by direct potentiometric determination and by titrations. The results have been compared to ion chromatography as the reference method. Both ion selective electrodes exhibit linear response from 10-5 mol/L to 10-1 mol/L respectively. The detection limits for the target ions are below 10-6 mol/L based on the respective ion.

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Stability of the Inner Polyaniline Solid Contact Layer in All-Solid-State K+-Selective Electrodes Based on Plasticized Poly(vinyl chloride)

Analytical Chemistry ◽

10.1021/ac049439q ◽

2004 ◽

Vol 76 (15) ◽

pp. 4387-4394 ◽

Cited By ~ 65

Author(s):

Tom Lindfors ◽

Ari Ivaska

Keyword(s):

Solid State ◽

Vinyl Chloride ◽

Contact Layer ◽

Solid Contact ◽

Poly Vinyl Chloride

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Application of polyaniline nanofibers for the construction of nitrate all-solid-state ion-selective electrodes

Applied Nanoscience ◽

10.1007/s13204-021-02228-1 ◽

2021 ◽

Author(s):

Karolina Pietrzak ◽

Cecylia Wardak ◽

Szymon Malinowski

Keyword(s):

Electrochemical Impedance ◽

Fast Response ◽

Point Of View ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Measuring Range ◽

Polyaniline Nanofibers ◽

Vis Spectroscopy ◽

Selective Membrane ◽

Nitrate Determination

AbstractThe application of polyaniline nanofibers doped with chloride and nitrate ions (PANINFs-Cl and PANINFs-NO3) in potentiometry was described. Both kinds of nanofibers were used as an ion-to-electron transducer in ion-selective electrodes with solid contact (SCISEs). Extensive research on the properties of the nanofibers themselves (SEM, UV–Vis spectroscopy, FTIR) and the constructed electrodes (potentiometric methods, electrochemical impedance spectroscopy) has been carried out. Basic analytical parameters of electrodes containing various nanofibers contents in the ion-selective membrane and with nanofibers as an intermediate layer were determined. It was found that application of PANI nanofibers resulted in improvement of electrode performance (among others, better stability and reversibility of the electrode potential). The obtained sensors were characterized by a high slope of the calibration curve, a wide measuring range and a fast response time. Moreover, they were insensitive to change of redox potential, as well as light and the presence of oxygen in the solution, what is important from a practical point of view. They were also successfully used for nitrate determination in real environmental samples.

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Water uptake in the hydrophilic poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) solid-contact of all-solid-state polymeric ion-selective electrodes

The Analyst ◽

10.1039/c1an15267j ◽

2011 ◽

Vol 136 (16) ◽

pp. 3252 ◽

Cited By ~ 23

Author(s):

Jean-Pierre Veder ◽

Roland De Marco ◽

Graeme Clarke ◽

San Ping Jiang ◽

Kathryn Prince ◽

...

Keyword(s):

Solid State ◽

Water Uptake ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Styrene Sulfonate ◽

Poly Styrene Sulfonate

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Improved Solid-Contact Nitrate Ion Selective Electrodes Based on Multi-Walled Carbon Nanotubes (MWCNTs) as an Ion-to-Electron Transducer

Sensors ◽

10.3390/s19183891 ◽

2019 ◽

Vol 19 (18) ◽

pp. 3891 ◽

Cited By ~ 7

Author(s):

Hassan ◽

Eldin ◽

Amr ◽

Al-Omar ◽

Kamel ◽

...

Keyword(s):

Carbon Nanotubes ◽

Ion Association ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Nitrate Ion ◽

Ion Sensing ◽

Coated Disc ◽

Multi Walled Carbon Nanotubes ◽

Nitrate Determination ◽

Walled Carbon Nanotubes

Possible improvement of the performance characteristics, reliability and selectivity of solid-contact nitrate ion-selective electrodes (ISE) (SC/NO3−-ISE) is attained by the application of a nitron-nitrate (Nit+/NO3−) ion association complex and inserting multi-walled carbon nanotubes (MWCNTs) as an ion-to-electron transducer between the ion sensing membrane (ISM) and the electronic conductor glassy carbon (GC) substrate. The potentiometric performance of the proposed electrode revealed a Nernstian slope −55.1 ± 2.1 (r² = 0.997) mV/decade in the range from 8.0 × 10−8–1 × 10−2 M with a detection limit of 2.8 × 10−8 (1.7 ng/mL). Selectivity, repeatability and reproducibility of the proposed sensors were considerably improved as compared to the coated disc electrode (GC/NO3−-ISE) without insertion of a MWCNT layer. Short-term potential stability and capacitance of the proposed sensors were tested using a current-reversal chronopotentiometric technique. The potential drift in presence of a MWCNT layer decreased from 167 μVs−1 (i.e., in absence of MWCNTs) to 16.6 μVs−1. In addition, the capacitance was enhanced from 5.99 μF (in absence of MWCNTs) to 60.3 μF (in the presence of MWCNTs). The presented electrodes were successfully applied for nitrate determination in real samples with good accuracy.

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