Piezoelectric and conductivity measurements of poly(pyrrole) gas interactions

Slater, Jonathan M.; Watt, Esther J.; Begley, Ian S.; Barnard, Charles L. R.; Ince, Ahmet T.; Snook, Richard D.; Dawson, J. B.

doi:10.1039/ap9922900053

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…deposited polypyrrole has also been used as a substrate (Slater and Watt 1992;Vigmond et al 1992). In its oxidized state, polypyrrole has perchlorate anion on its surface.…”

Section: Electrochemicallymentioning

confidence: 99%

Performance specifications for technology development: Application for characterization of volatile organic compounds in the environment

Carpenter¹,

Doskey²,

Erickson³

et al. 1994

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“…deposited polypyrrole has also been used as a substrate (Slater and Watt 1992;Vigmond et al 1992). In its oxidized state, polypyrrole has perchlorate anion on its surface.…”

Section: Electrochemicallymentioning

confidence: 99%

Performance specifications for technology development: Application for characterization of volatile organic compounds in the environment

Carpenter¹,

Doskey²,

Erickson³

et al. 1994

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“…The procedure for poly(pyrro1e) deposition and conditioning has been described in detail previously. 20 The polymer film is formed on the working electrode as it is cycled between 0.15 and 0.9 V in an aqueous solution containing pyrrole (0.05 mol dm-3) and KBr (1.0 mol dm-3). The number of cycles in this stage determines the final mass of polymer deposited.…”

Section: Preparation Of Poly(pyrro1e)mentioning

confidence: 99%

Gas and vapour detection with poly(pyrrole) gas sensors

Slater¹,

Watt²,

Freeman³

et al. 1992

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101

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The response mechanism of the conducting polymer poly(pyrro1e) to a selection of gases and vapours was investigated using two techniques: measurement of resistance change and mass changes using a piezoelectric quartz crystal microbalance with the objective of characterizing responses for incorporation in sensor arrays. Bromide-doped films were exposed to methanol, hexane, 2-2-dimethylbutane, ammonia and hydrogen sulfide. Polymers of different thicknesses were also exposed to methanol vapour and the response profiles were studied. The responses were all of a Fickian type except the piezoelectric signal, which exhibited an anomalous non-Fickian response to methanol. This suggests that the poly(pyrro1e) resistance changes frequently observed are partly due to one stage in the two-stage sorption perhaps involving the swelling of the polymer. It was concluded that the response mechanism of poly(pyrro1e) sensing of different gases and vapours is due to a mixed response involving electronic effects and physical effects.

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“…Additionally they have a selectivity that depends on their synthesis method; therefore, they have application to pattern recognition systems and electronic noses [5]. A sensing principle associated with conducting polymers is currently being developed [1][2][3][4][5]. However, little is known of the mechanism of conducting polymer sensing on gas molecules, especially VOCs.…”

Section: Introductionmentioning

confidence: 99%

Sensing Mechanism of Conducting Polymer Sensor for Volatile Organic Compounds

Huh

Hwang²,

Lee

et al. 2003

MSF

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In this study, the chemically polymerized PPy and PANi films with different selectivity by controlling dedoping time were fabricated. Additionally, the sensing properties and mechanism of VOCs adsorption to conducting polymers were investigated with contact angles measurement, a scanning probe microscope (SPM) and a UV-Vis-NIR spectrophotometer. The thin sensor had higher sensitivity compared to the thick one, which the dedoped sensor at 1-minute had the highest sensitivity. Upon gas absorption, polypyrrole exhibited positive sensitivity while polyaniline had negative sensitivity. PPy film showed hydrophilic property and PANi film showed hydrophobic property. After gas absorption, the sensitivity increased as a function of the polarity of the absorbed molecules. These behaviors are due to the polar molecules absorbed with the movable polaron or free carrier, which then interrupts or generates the movement of polaron and carrier, and then changes the conductivity of the polymer. We found that conducting polymer sensors are very sensitive to the difference in polarity of gas molecules.

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Piezoelectric and conductivity measurements of poly(pyrrole) gas interactions

Cited by 13 publications

References 3 publications

Performance specifications for technology development: Application for characterization of volatile organic compounds in the environment

Performance specifications for technology development: Application for characterization of volatile organic compounds in the environment

Gas and vapour detection with poly(pyrrole) gas sensors

Sensing Mechanism of Conducting Polymer Sensor for Volatile Organic Compounds

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