Mechanistic studies on the interactions between poly(pyrrole) and organic vapors

Charlesworth, John M.; Partridge, Ashton; Garrard, N.

doi:10.1021/j100122a038

Cited by 77 publications

(64 citation statements)

References 6 publications

(7 reference statements)

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“…The interaction of CPs with different organic vapors is in fact still a matter of discussion. In this respect, the study reporting on the simultaneous measurement of both the mass uptake and the resistance change of a polypyrrole film exposed to a homologous series of solvents is interesting (30). The data were modeled by correlating the dielectric constant of the organic vapors to the conductivity of the polymer.…”

Section: Igfets As Chemically Sensitive Fetsmentioning

confidence: 99%

Organic Thin-Film Transistors as Plastic Analytical Sensors

Torsi¹,

Dodabalapur²

2005

Anal. Chem.

145

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Section: Igfets As Chemically Sensitive Fetsmentioning

confidence: 99%

Organic Thin-Film Transistors as Plastic Analytical Sensors

Torsi¹,

Dodabalapur²

2005

Anal. Chem.

145

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“…Surface acoustic wave resonators are extremely sensitive to both mass and acoustic impedance changes of the coatings in array elements, but the signal transduction mechanism involves somewhat complicated electronics, requiring frequency measurement to 1 Hz while sustaining a 100-MHz Rayleigh wave in the crystal (10,11). Electrically conductive organic polymer elements are well-suited for such an array, because swelling of the polymer upon exposure to an analyte will induce changes in the resistivity of the polymer film (17,18). This enables a direct low-power electrical signal readout (the film resistance) to be used as the sensing signal.…”

mentioning

confidence: 99%

A chemically diverse conducting polymer-based "electronic nose".

Freund

Lewis

1995

Proc. Natl. Acad. Sci. U.S.A.

310

188

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We describe a method for generating a variety of chemically diverse broadly responsive low-power vapor sen-sors. The chemical polymerization of pyrrole in the presence of plasticizers has yielded conducting organic polymer films whose resistivities are sensitive to the identity and concentration of various vapors in air. An array of such sensing elements produced a chemically reversible diagnostic pattern of electrical resistance changes upon exposure to different odorants. Principal component analysis has demonstrated that such sensors can identify and quantity different airborne organic solvents and can yield information on the components of gas mixtures.There is considerable interest in developing sensors that act as analogs of the mammalian olfactory system (1, 2). This system is thought to utilize probabilistic repertoires of many different receptors to recognize a single odorant (3, 4). In such a configuration, the burden of recognition is not on highly specific receptors, as in the traditional "lock-and-key" molecular recognition approach to chemical sensing, but lies instead on the distributed pattern processing of the olfactory bulb and the brain (5, 6). We describe herein the construction and characterization of a broadly responsive vapor detection array based on conducting polymer "chemiresistor" elements. Such conducting polymer elements are simply prepared and are readily modified chemically to respond to a broad range of analytes. In addition, these sensors yield a fairly rapid lowpower dc electrical signal in response to the vapor of interest, and their signals are readily integrated with software-or hardware-based neural networks for purposes of analyte identification.Prior attempts to produce a broadly responsive sensor array have exploited heated metal oxide thin film resistors (7-9), polymer sorption layers on the surfaces of acoustic wave resonators (10, 11), arrays of electrochemical detectors (12-14), or conductive polymers (15, 16). Arrays of metal oxide thin film resistors, typically based on SnO2 films that have been coated with various catalysts, yield distinct diagnostic responses for several vapors (7-9). However, due to the lack of understanding of catalyst function, SnO2 arrays do not allow deliberate chemical control of the response of elements in the arrays nor reproducibility of response from array to array. Surface acoustic wave resonators are extremely sensitive to both mass and acoustic impedance changes of the coatings in array elements, but the signal transduction mechanism involves somewhat complicated electronics, requiring frequency measurement to 1 Hz while sustaining a 100-MHz Rayleigh wave in the crystal (10, 11). Electrically conductive organic polymer elements are well-suited for such an array, because swelling of the polymer upon exposure to an analyte will induce changes in the resistivity of the polymer film (17,18). This enables a direct low-power electrical signal readout (the film resistance) to be used as the sensing signal. Some prior work has been pe...

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“…Charlesworth et al [18] investigated the relationship between mass and conductance changes in a PPy film and found that the fractional change in resistance varies linearly with fractional mass uptake when the mass change is below 5%. The diffused mass due to adsorbed CO molecules inside the film during exposure to CO is described by Fick's equation [19] for diffusion:…”

Section: Qcm and Ide Resultsmentioning

confidence: 99%

Improving the CO Sensing Properties of Ferrocene Modified Polypyrrole/Silicon Carbide Nanocomposite Films Synthesized by Electrochemical Deposition

Darwish¹,

Okur²

2017

AJN

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Abstract:In this study, SiC nanoparticles 40 nm in diameter were added to ferrocene-modified conducting polymer (FcPPy) films to improve the signal/noise ratio of a sensor. The increased porosity of the Fc-PPy/SiC nanocomposite film produces a larger active surface area with more active sites available for adsorption. Electrochemical deposition was used to fabricate nanocomposite films (PPy, Fc-PPy, PPy/SiC and Fc-PPy/SiC), on both QCM and interdigitated electrodes, to measure CO concentration. All nanocomposites were characterized using XRD, SEM and TEM. The grain sizes of the nanocomposites were measured to be between 100 nm and 500 nm after electrochemical polymerization coating. IDE chemiresistor sensors and QCM piezoelectric sensors were used to investigate the potential sensing mechanisms and adsorption-desorption kinetics of Fc-PPy/SiC nanocomposite films and to compare these films with bare PPy films. The sensitivity of Fc-PPy/SiC nanocomposite sensors to CO gas was significantly improved by the effects of the chemical activation of SiC catalyst nanoparticle additives and ferrocene modified conducting polymers.

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Mechanistic studies on the interactions between poly(pyrrole) and organic vapors

Cited by 77 publications

References 6 publications

Organic Thin-Film Transistors as Plastic Analytical Sensors

Organic Thin-Film Transistors as Plastic Analytical Sensors

A chemically diverse conducting polymer-based "electronic nose".

Improving the CO Sensing Properties of Ferrocene Modified Polypyrrole/Silicon Carbide Nanocomposite Films Synthesized by Electrochemical Deposition

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