Polypyrrole thin films for gas sensors prepared by Matrix-Assisted Pulsed Laser Evaporation technology: Effect of deposition parameters on material properties

Kopecký, Dušan; Vrňata, Martin; Vyslouzil, Filip; Myslik, V.; Fitl, Přemysl; Ekrt, Ondřej; Matějka, Pavel; Jelı́nek, M.; Kocourek, T.

doi:10.1016/j.tsf.2008.10.047

Cited by 19 publications

(8 citation statements)

References 25 publications

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“…The FT-IR peak of carbonyl bands of acrylate units located at about 1730 cm −1 and was very strong [27]. According to the reaction processes and the different dopants [21,[28][29][30][31], the location of the C O bond of carbonyl groups in PPy composites was a reasonable scope. The peak at about 1710 cm −1 is normally attributed to the C O stretching in our work, which suggests that the pyrrole rings were slightly overoxidized.…”

Section: Resultsmentioning

confidence: 99%

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Sun

Wei

et al. 2009

Sensors and Actuators B: Chemical

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Section: Resultsmentioning

confidence: 99%

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Sun

Wei

et al. 2009

Sensors and Actuators B: Chemical

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“…The gas sensors based on conducting polymer have received considerable interest because of their superior properties such as excellent conductivity, high gas-sensing ability, and good environment stability. [3][4][5] On the other hand, the oxide-based polymer composites have been reported to obtain the optimal properties in recent years, which exhibit high sensitivity to numerous kinds of gases including NH 3 , vapors of organic solvents and other toxic gases, and their electrical responses were believed to involve the modification of the conductive path due to the swelling of polymer film and/or the charge transfer resulting from the interaction of adsorbed gas molecules with semiconducting oxide and conducting polymers. 6,7 Among the various organic conductive polymers, polypyrrole (PPy) has been studied frequently as a gas sensor owing to its excellent properties of stability and flexibility.…”

Section: Introductionmentioning

confidence: 99%

Examining the use of TiO₂ to enhance the NH₃ sensitivity of polypyrrole films

Yan

Xing

2010

J of Applied Polymer Sci

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Polypyrrole/Titanium dioxide (PPy/TiO 2 ) composite thin films were prepared by polymerizing the monomer pyrrole in aqueous solution containing a certain amount of TiO 2 particles at room temperature, and their response to ammonia (NH 3 ) gas was examined systematically. Compared with the pristine PPy film, which reached the saturation at the concentration of NH 3 beyond 200 ppm, the composite films showed more stable response and higher sensitivity. Furthermore, the PPy/TiO 2 composite thin films exhibited a low detection limit of 2 ppm. The film thickness, which had a strong influence on the film sensitivity to NH 3 , could be controlled by varying the polymerization time. The sensitivity to NH 3 gas of the samples with different content of TiO 2 and different molar ratio of PPy/TiO 2 /oxidant was studied.

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“…No caso de óxidos metálicos, o compósito passa a formar uma heterojunção do tipo p-n, o que vem a afetar diretamente a sensibilidade do sistema a partir da ampliação na taxa de transferência de elétrons [25] . Adicionalmente, outro parâmetro fundamental a ser considerado na maximização da sensibilidade dos dispositivos é a porosidade da matriz hospedeira [26] . O uso do álcool polivinílico permite com que se tenham boa propriedade mecânica, flexibilidade e porosidade, a serem aproveitadas na detecção de voláteis [27] .…”

Section: Resultsunclassified

Preparação e caracterização elétrica de sensores de metanol à base de nanocompósitos híbridos de polipirrol/nanopartículas metálicas

et al. 2010

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Resumo: Neste trabalho, compósitos híbridos metal/polímero (nanopartículas de ouro/polipirrol) foram sintetizados a partir da polimerização química do pirrol sobre a superfície de nanopartículas metálicas estabilizados por um agente surfactante (dodecil sulfato de sódio). A posterior solubilização do compósito em álcool polivinílico permitiu a obtenção de uma matriz orgânica auto-sustentável, flexível, com boa resistência mecânica e aplicável na detecção de compostos voláteis (com especial atenção ao metanol). Nessa direção, foram otimizadas as condições de preparação do compósito, no sentido de promover a detecção e quantificação do metanol em misturas com etanol, com o intuito de aplicar o dispositivo no reconhecimento de resquícios de metanol em bebidas alcoólicas. Dos sistemas analisados, a sensibilidade dos dispositivos se mostrou diretamente proporcional à constante dielétrica do volátil utilizado, indicando que interações físicas ocorrem na matriz na presença de voláteis. Palavras-chave: Sensor impedancimétrico, nanocompósitos poliméricos, espectroscopia de impedância elétrica. Preparation and Electrical Characterization of Gold Nanoparticles-Polypyrrole Hybrid Composites for Application in Methanol Gas SensingAbstract: In this study, hybrid composites of gold nanoparticles and polypyrrole (AuNPs-PPy) were manufactured by chemical polymerization of the pyrrole monomer on the surface of metal nanoparticles, which were then incorporated in a poly(vinyl alcohol) (PVA) matrix to be exploited in sensing technologies for detecting methanol. The preparation conditions were optimized to maximize sensitivity, allowing for the determination of relative concentrations of methanol molecules in binary mixtures of methanol/ethanol. This was carried out using the electrical response of the sensor, which depends on the dielectric constant of the volatile organic compounds. Keywords: Sensor, polymeric nanocomposites, electrical impedance spectroscopy. IntroduçãoNanopartículas de ouro têm sido bastante usadas em diversas aplicações tecnólogicas por reunir elevada biocompatibilidade, área superficial e potencial interação com sistemas biológicos [1][2][3][4][5] . Por sua vez, os polímeros condutores vêm sendo constantemente aplicados nos últimos anos em dispositivos luminescentes, diodos emissores de luz, atuadores mecânicos do tipo músculos artificiais entre outros [6][7][8] , sendo o polipirrol um excelente sistema para tais implementações [9][10][11] . A síntese de compósitos híbridos do tipo metal-polímero condutor, por sua vez, possibilita com que se tenha uma interação sinergética entre as propriedades de ambos os sistemas interagentes, possibilitando com que a auto-montagem em escala nanométrica dê origem a estruturas em que se tem o completo recobrimento das partículas metálicas pelo polímero condutor, e consequentemente se obtenha elevação na área superficial das partículas distribuídas pela matriz, influenciando finalmente na sensibilidade da mesma.A estabilidade das soluções coloidais contendo nanocompósitos mist...

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Polypyrrole thin films for gas sensors prepared by Matrix-Assisted Pulsed Laser Evaporation technology: Effect of deposition parameters on material properties

Cited by 19 publications

References 25 publications

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Examining the use of TiO₂ to enhance the NH₃ sensitivity of polypyrrole films

Preparação e caracterização elétrica de sensores de metanol à base de nanocompósitos híbridos de polipirrol/nanopartículas metálicas

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Polypyrrole thin films for gas sensors prepared by Matrix-Assisted Pulsed Laser Evaporation technology: Effect of deposition parameters on material properties

Cited by 19 publications

References 25 publications

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Examining the use of TiO2 to enhance the NH3 sensitivity of polypyrrole films

Preparação e caracterização elétrica de sensores de metanol à base de nanocompósitos híbridos de polipirrol/nanopartículas metálicas

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Examining the use of TiO₂ to enhance the NH₃ sensitivity of polypyrrole films