Potentiometric pH sensors based on electrodeposited polymers

Lakard, Boris; Herlem, Guillaume; Lakard, Sophie; Guyetant, René; Fahys, Bernard

doi:10.1016/j.polymer.2005.10.095

Cited by 65 publications

(47 citation statements)

References 11 publications

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“…These layers presented potentiometric response of 59 mV/pH over pH 3-9. Potentiometric sensors composed of electropolymerized polyaniline and polypyrrole (PPy) exhibit sensitivity of 59 mV/pH and 48 mV/pH, respectively, with a deviation from linearity in the former [26]. The high surface-to-volume ratio, characteristic of nanomaterials, improves the device performance, as presented here.…”

Section: Pvs/n-pani As Fet-based Ph Sensormentioning

confidence: 79%

Nanostructured polyaniline thin films as pH sensing membranes in FET-based devices

Vieira

Fernandes

Faceto

et al. 2011

Sensors and Actuators B: Chemical

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Section: Pvs/n-pani As Fet-based Ph Sensormentioning

confidence: 79%

Nanostructured polyaniline thin films as pH sensing membranes in FET-based devices

Vieira

Fernandes

Faceto

et al. 2011

Sensors and Actuators B: Chemical

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“…Simultaneously, the protonation enhances the conductivity of PPY, whereas deprotonation decreases conductivity [103]. The pK a of the PPY forms is in the range from 2 to 4 and 9 to 11 [93,103] and its behavior follows the same law as for regular electrodes of second type with the proton as a potential determining ion [51].…”

Section: Transducers For Artificial Receptors Based On Conducting Polmentioning

confidence: 76%

“…Both PPY and PANI show very high proton permeability in aqueous solution [51][52][53]: films of these polymers on glassy carbon and platinum electrodes demonstrate almost nernstian behavior relative to pH. High proton permeability and the electronic component of conductivity make PANI and PPY perspective materials for solid-state pH sensors development (Table 12.2).…”

Section: Transducers For Artificial Receptors Based On Conducting Polmentioning

confidence: 99%

Conducting Polymers as Artificial Receptors in Chemical Sensors

Lange

Roznyatovskaya

Hao

et al. 2010

Artificial Receptors for Chemical Sensors

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Conducting polymers are commonly used materials in chemical and biological sensors. These materials possess receptor as well as transducer functions [1]. Typical examples of conducting polymers (CPs) include polythiophenes, polypyrroles, polyanilines, and polyphenylenes. Such polymers show some intrinsic receptor properties towards analytes that can react/interact with the polymer, like, for example, redox active or acidic/basic gases. Oxidation/reduction and in some cases protonation/ deprotonation introduces/removes charge carriers in the conjugated backbone, whereas conformational changes alter the planarity of the conjugated backbone, which leads to changes in the mobility of the charge carriers. Figure 12.1 demonstrates the example of PANI (polyaniline), showing the influence of redox potential and pH on the interconversion between the different forms of PANI.These changes can be detected by in situ resistance, UV-vis, IR, or fluorescence measurements. Direct interactions with the p-system often produce very large signal changes; however, they are quite non-specific. A possible way to introduce some selectivity in these polymers is to modify their conjugated backbone with receptors.Usually, receptors can be introduced into a polymer backbone either after polymerization or directly to monomer, which is polymerized or copolymerized. The synthetic availability and the ability to polymerize the monomer under certain conditions are the most common limitations in the choice of a derivative with receptor group. Some classes of these receptors are discussed in Section 12.4. Doping of CPs by counter ions bearing the required receptor [2-8], the inclusion of ionophores into the polymer matrix [9], and the chemical linkage of ligands or receptor units to the polymer backbone [10] are also applied to enhance the selectivity and sensitivity of CPs. Receptors attached to the p-system via some short side chain can communicate with the p-system of the polymer by, for example, electron donating/withdrawing, electrostatic interactions or by inducing conformational changes upon analyte binding. As there is no direct interaction with the polymer backbone, the signal change may be smaller, but also much more specific. Artificial Receptors for Chemical Sensors. Edited

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“…The PANI based potentiometric sensors have been described for the measurements of acidity [27,28] and species affecting protonation of emeraldine salt (ammonia and biogenic amines [29,30]). The pH dependence of the PANI potential is related to the involvement of H + ions in the reactions reversible transformation of the PANI forms.…”

Section: Potentiometric Ph Measurementsmentioning

confidence: 99%

Solid‐Contact Potentiometric Sensor Based on Polyaniline and Unsubstituted Pillar[5]Arene

et al. 2014

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A novel potentiometric sensor based on screen‐printed carbon electrode covered with electropolymerized polyaniline (PANI) and unsubstituted pillar[5]arene as ionophore has been developed and tested in potentiometric measurements of pH and metal ions. The introduction of pillar[5]arene improved the reversibility of the pH response in the range from 2.0 to 9.0 with the slope of 45 mV/pH. Among metal cations, the response to Fe3+ and Ag+ ions was referred to PANI redox conversion whereas the signal toward Cu2+ in the range from 1.0×10−6 to 1.0×10−2 M (limit of detection (LOD) 3.0×10−7 M) to specific interaction with the macrocycle.

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Potentiometric pH sensors based on electrodeposited polymers

Cited by 65 publications

References 11 publications

Nanostructured polyaniline thin films as pH sensing membranes in FET-based devices

Nanostructured polyaniline thin films as pH sensing membranes in FET-based devices

Conducting Polymers as Artificial Receptors in Chemical Sensors

Solid‐Contact Potentiometric Sensor Based on Polyaniline and Unsubstituted Pillar[5]Arene

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