A sensor of alcohol vapours based on thin polyaniline base film and quartz crystal microbalance

Ayad, Mohamad M.; El-Hefnawey, G. B.; Torad, Nagy L.

doi:10.1016/j.jhazmat.2009.02.003

Cited by 114 publications

(47 citation statements)

References 16 publications

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“…In order to crosscheck the film thickness measurements from the first method we used the QCM to measure the mass of the film coated on the gold surface and thus calculated the average thickness of the films using [28] -…”

Section: Resultsmentioning

confidence: 99%

Diffusion of nitroaromatic vapours into fluorescent dendrimer films for explosives detection

Ali¹,

Chen²,

Cavaye³

et al. 2015

Sensors and Actuators B: Chemical

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Abstract:Fluorescence-based sensing with organic semiconductors is a powerful method for the detection of a broad range of analytes including explosives, chemical weapons and drugs.Diffusion of an analyte into an organic semiconductor thin film, and its subsequent interaction with the chromophore are key factors that govern the sensing performance of a chemosensor.In this study the diffusion behaviour of an explosive analyte analogue into a sensing film of a conjugated dendrimer was investigated using a quartz crystal microbalance (QCM) and correlated with neutron reflectivity measurements. The mechanistic insights of paranitrotoluene (pNT) sorption in the films of different thicknesses of a first generation dendrimer with fluorenyl surface groups, carbazole dendrons and a spirobifluorene core were studied and interpreted in terms of the underlying kinetics and thermodynamics. Sorption measurements suggest that the process of diffusion of pNT vapour into the dendrimer films is Super Case II, which involves swelling of the film. Swelling of the film was confirmed by neutron reflectometry measurements, which also showed uniform distribution of the pNT molecules throughout the entire film thickness. The activation energy barrier and change in Gibbs free energy in the sorption process were calculated from the QCM responses. The sorption process was found to be thermodynamically (not kinetically) controlled and independent of film thickness. This work sheds insight into the structure-property relationships that govern the performance of organic semiconductor fluorescence-based chemosensors.

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Section: Resultsmentioning

confidence: 99%

Diffusion of nitroaromatic vapours into fluorescent dendrimer films for explosives detection

Ali¹,

Chen²,

Cavaye³

et al. 2015

Sensors and Actuators B: Chemical

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“…Acetone, as a widely used solvent in industry and laboratory, can volatilize easily and affect human health when its concentration is higher than 173 ppm [1]. Although the study on acetone sensor is necessary, the present reported acetone sensors have suffered from some disadvantages, such as poor selectivity, inadequate sensitivity [2e6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of three-dimensional flower-like hierarchical ZnO nanostructure and its enhanced acetone gas sensing properties

Peng

Guo

Yang

et al. 2016

Journal of Alloys and Compounds

152

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“…The nature of PANI conductivity is explained by its ability to form polarons and cation radicals [3]. PANI sensors are largely reported for the sensing of volatile organic compounds which cause health issues such as allergy, irritation to eyes and skin, damage to kidneys and lungs, cancer and even death [4,6]. Our research focuses on polar molecules, especially the ones from amide group, which are mostly toxic and carcinogenic.…”

Section: Introductionmentioning

confidence: 99%

Plasma-enabled sensing of urea and related amides on polyaniline

Puliyalil

Slobodian

Sedlačík

et al. 2016

Front. Chem. Sci. Eng.

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The atmospheric pressure plasma jet (APPJ) was used to enhance the sensitivity of industrially important polyaniline (PANI) for detection of organic vapors from amides. The gas sensing mechanism of PANI is operating on the basis of reversible protonation or deprotonation, whereas the driving force to improve the sensitivity after plasma modifications is unknown. Herein we manage to solve this problem and investigate the sensing mechanism of atmospheric plasma treated PANI for vapor detection of amides using urea as a model. The results from various analytical techniques indicate that the plausible mechanism responsible for the improved sensitivity after plasma treatment is operating through a cyclic transition state formed between the functional groups introduced by plasma treatment and urea. This transition state improved the sensitivity of PANI towards 15 ppm of urea by a factor of 2.4 times compared to the non-treated PANI. This plasma treated PANI is promising for the improvement of the sensitivity and selectivity towards other toxic and carcinogenic amide analytes for gas sensing applications such as improving material processing and controlling food quality.

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A sensor of alcohol vapours based on thin polyaniline base film and quartz crystal microbalance

Cited by 114 publications

References 16 publications

Diffusion of nitroaromatic vapours into fluorescent dendrimer films for explosives detection

Diffusion of nitroaromatic vapours into fluorescent dendrimer films for explosives detection

Synthesis of three-dimensional flower-like hierarchical ZnO nanostructure and its enhanced acetone gas sensing properties

Plasma-enabled sensing of urea and related amides on polyaniline

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