Impedance properties of polypyrrolic sensors prepared by MAPLE technology

Vrňata, Martin; Kopecký, Dušan; Vyslouzil, Filip; Myslik, V.; Fitl, Přemysl; Ekrt, Ondřej; Hofmann, Jaroslav; Kučera, Lukáš

doi:10.1016/j.snb.2008.11.013

Cited by 17 publications

(6 citation statements)

References 9 publications

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“…In case of high relative humidity region, a linear tail occurred at lower frequencies accompanied by a significant decrease of the semicircular part. The Warburg impedance ( ) element was added in series with to the equivalent circuit as shown in Figure 10(b), which represents the involvement of diffusion of reactants [26]. If the adsorption is increased further the resulting Nyquist diagram is 6 Advances in Materials Science and Engineering a 45 ∘ line for all frequencies.…”

Section: Resultsmentioning

confidence: 99%

A Humidity Sensor Based on Silver Nanoparticles Thin Film Prepared by Electrostatic Spray Deposition Process

Thiwawong

Onlaor

Tunhoo

2013

Advances in Materials Science and Engineering

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In this work, thin film of silver nanoparticles for humidity sensor application was deposited by electrostatic spray deposition technique. The influence of the deposition times on properties of films was studied. The crystal structures of sample films, their surface morphology, and optical properties have been investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV-VIS spectrophotometer, respectively. The crystalline structure of silver nanoparticles thin film was found in the orientation of (100) and (200) planes of cubic structure at diffraction angles 2θ = 38.2° and 44.3°, respectively. Moreover, the silver nanoparticles thin films humidity sensor was fabricated onto the interdigitated electrodes. The sensor exhibited the humidity adsorption and desorption properties. The sensing mechanisms of the device were also elucidated by complex impedance analysis.

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Section: Resultsmentioning

confidence: 99%

A Humidity Sensor Based on Silver Nanoparticles Thin Film Prepared by Electrostatic Spray Deposition Process

Thiwawong

Onlaor

Tunhoo

2013

Advances in Materials Science and Engineering

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“…Polypyrrole (PPy) is also known to be a promising material for gas sensors detecting vapors of organic solvents [15]. Another interesting aspect is represented by the possibility to study properties of PPy-based sensors by impedance spectroscopy [16]. …”

Section: Introductionmentioning

confidence: 99%

Polypyrrole Nanotubes and Their Carbonized Analogs: Synthesis, Characterization, Gas Sensing Properties

Kopecká

Mrlík

Olejník

et al. 2016

Sensors

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Polypyrrole (PPy) in globular form and as nanotubes were prepared by the oxidation of pyrrole with iron(III) chloride in the absence and presence of methyl orange, respectively. They were subsequently converted to nitrogen-containing carbons at 650 °C in an inert atmosphere. The course of carbonization was followed by thermogravimetric analysis and the accompanying changes in molecular structure by Fourier Transform Infrared and Raman spectroscopies. Both the original and carbonized materials have been tested in sensing of polar and non-polar organic vapors. The resistivity of sensing element using globular PPy was too high and only nanotubular PPy could be used. The sensitivity of the PPy nanotubes to ethanol vapors was nearly on the same level as that of their carbonized analogs (i.e., ~18% and 24%, respectively). Surprisingly, there was a high sensitivity of PPy nanotubes to the n-heptane vapors (~110%), while that of their carbonized analog remained at ~20%. The recovery process was significantly faster for carbonized PPy nanotubes (in order of seconds) compared with 10 s of seconds for original nanotubes, respectively, due to higher specific surface area after carbonization.

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“…6 (sensors A2 and B4) have a common character: depressed semicircles with a low-frequency tail. The occurrence of the tail suggests a strong influence from ionic conductivity at low frequencies [28]. In terms of equivalent circuit parameters such behaviour can be modelled by a parallel combination of a resistor and a generalized capacitor -Constant Phase Element (CPE).…”

Section: Impedance Spectra Of Sensitive Layers Based On Pilsmentioning

confidence: 99%

“…11). In previous research our group investigated other classes of sensitive layer materials with fmax as follows: tin dioxide with fmax = 7 x 105 Hz [26]; acetylacetonates with fmax = 4 x 105 Hz, polypyrrole with fmax = 5 x 103 Hz [28] and sulphonated phthalocyanines fmax = 5 x 105 Hz [33]. 3.5 Changes in FTIR spectra on exposure to analytes Diethylmalonate (DEM) was the only analyte, whose presence in PIL was detectable by FTIR spectroscopy.…”

Section: Ac-responses To Toxic Gasesmentioning

confidence: 99%

Textile chemiresistors with sensitive layers based on polymer ionic liquids: Applicability for detection of toxic gases and chemical warfare agents

Marešová

Tomeček

Fitl

et al. 2018

Sensors and Actuators B: Chemical

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HighlightsThe article presents pioneering research of textile chemiresistors on Evolon and Polyester substrates equipped with graphite electrodes and in-situ polymerized poly(tetrabutylphosphonium 3-sulfopropylacrylate) or poly(tributylhexylphosphonium 3-sulfopropylacrylate) sensitive layers. The DC-and AC-responses to 10 ppm of methanol, nitrogen dioxide, 4-bromoacetophenone, diethylmalonate and yperite were then investigated at laboratory temperature -the reference was "pure" synthetic air. Under these circumstances the DC-responses (SDC) varied from 0.48 to 1.36 and maximum AC-responses (Spa) from 8 to 26 deg. It was shown that sensor dynamics depends mainly on molecular weight of the analytes. Moreover, the magnitude of AC-responses correlated both qualitatively and quantitatively with the dipole moments of the analyzed molecules.

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Impedance properties of polypyrrolic sensors prepared by MAPLE technology

Cited by 17 publications

References 9 publications

A Humidity Sensor Based on Silver Nanoparticles Thin Film Prepared by Electrostatic Spray Deposition Process

A Humidity Sensor Based on Silver Nanoparticles Thin Film Prepared by Electrostatic Spray Deposition Process

Polypyrrole Nanotubes and Their Carbonized Analogs: Synthesis, Characterization, Gas Sensing Properties

Textile chemiresistors with sensitive layers based on polymer ionic liquids: Applicability for detection of toxic gases and chemical warfare agents

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