Electrical conductivity response of polypyrrole to acetone vapor: effect of dopant anions and interaction mechanisms

Ruangchuay, Ladawan; Sirivat, Anuvat; Schwank, Johannes W.

doi:10.1016/s0379-6779(02)01319-x

Cited by 91 publications

(44 citation statements)

References 17 publications

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“…Though there is negligible intensity change of 0.4% in the presence of water vapor there is an observed intensity decrease of 4.2 % upon ammonia exposure and an intensity increase of 3.8 % and 2.8% upon exposure to acetone and methanol respectively. These responses are attributed to the polypyrrole swelling upon exposure to acetone and methanol [30] and the primary doping to polypyrrole when exposed to ammonia [31]. Kepley et al [32] ions as compared to other gases, this difference in the response amplitude may be used to selectively distinguish DMMP from other potential analytes which react with polypyrrole producing a much lower sensor response.…”

Section: CIII Influence Of Light Source Intensitymentioning

confidence: 99%

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

Bansal

El-Sherif

2010

International Journal on Smart Sensing and Intelligent Systems

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Section: CIII Influence Of Light Source Intensitymentioning

confidence: 99%

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

Bansal

El-Sherif

2010

International Journal on Smart Sensing and Intelligent Systems

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“…), though the mechanism was not studied in detail. A change of the potential barrier at the boundary between the polymer grains [124] or conformation of polymer chains [44,125], a change of the dielectric constant of CP [126], the influence on electron jumping along the CP chain [124], or a change in several charge carries [127] are assumed to explain the sensitivity of CP to the organic vapors.…”

Section: Affinity To Gases and Vaporsmentioning

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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“…From this point of view the most interesting ECP specimens are polyaniline (PAn) and polypyrrole (PP), since they show relatively high stability towards the influence of environmental factors (temperature, humidity), may be easily obtained in both powder and thin film forms and also can be doped by various dopants [1,3].…”

Section: Introductionmentioning

confidence: 99%

“…For PAn films this phenomenon is observed independently of the nature of used dopant [4]. At the same time, not very numerous published results of the works dedicated to investigation of possibility of ECP utilization in the chemical sensors are quite contradictory: some of them denote increase of conductivity of a given polymer under the effect of organic solvents vapors [5,6] and the other ones denote conductivity decrease [3,6,7]. Apparently, this difference is conditioned by the nature of used dopants or by the method of ECP films synthesis.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Thin Electropolymerized Polypyrrole and Polyaniline Films as Sensitive Layers in Chemoresistor Sensor Arrays

Кукла

Pavluchenko

Kotljar

et al. 2014

SEMST

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In this work chemosensitivity of the thin electropolymerized polypyrrole and polyaniline films is studied by analysis of the experimental data obtained from the arrays of electroconductive polymer sensors. Sensor response towards vapors of various organic solvents is analyzed and several possible mechanisms of interaction of the organic solvent with the doped polymer film is considered. By comparative study of the polypyrrole and polyaniline-based sensors responses an explanation of dependence of senor response on analyte acidity and polarity factors is proposed.

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Electrical conductivity response of polypyrrole to acetone vapor: effect of dopant anions and interaction mechanisms

Cited by 91 publications

References 17 publications

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

Conducting Polymers as Artificial Receptors in Chemical Sensors

Utilization of Thin Electropolymerized Polypyrrole and Polyaniline Films as Sensitive Layers in Chemoresistor Sensor Arrays

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