Potentiometric miniaturized pH sensors based on polypyrrole films

Lakard, Boris; Segut, Olivier; Lakard, Sophie; Herlem, Guillaume; Gharbi, Tijani

doi:10.1016/j.snb.2006.04.112

Cited by 93 publications

(72 citation statements)

References 19 publications

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“…Conducting polymers have been used in sensor technology thanks to their optical and electronic properties [5][6][7][8][9]. Research carried out recently in electrochemical sensor technology revealed that modification of the electrode surfaces with organicinorganic coatings avoids the drawbacks associated with bare electrodes.…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

et al. 2011

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“…Hence the development of fast, precise and accurate, reliable and sensitive pH sensor device is important in several applications [39,40]. The pH measurement is performed by different methods including potentiometric [41], ion sensitive field effect transistor [42], and conductometric/capacitive [43]. However, potentiometric technique is widely used due to its simplicity, does not require skilled person and can be used for longer periods of time.…”

Section: Introductionmentioning

confidence: 99%

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

Hussain

Ibupoto

Abbasi

et al. 2014

Journal of Electroanalytical Chemistry

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Abstract:A fast, reliable, accurate, precise and sensitive pH sensor device is highly demanding for the monitoring of pH in biological, clinical and food industry samples. In this research work, the effect of anions on the morphology of cobalt oxide (Co3O4) nanostructures is investigated using low temperature chemical approach for the growth. Different anions have shown visible effect on the morphology of Co3O4 nanostructures. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy techniques were used for the material characterization.This study has shown highly dense, uniform and good crystal quality of fabricated Co3O4 nanostructures. The nanostructures obtained from the cobalt chloride were used for the development of potentiometric pH sensor electrode. The pH sensor electrode showed excellent linearity and close to Nernstian response for the pH range of 3-13 with a sensitivity of -58.45 mV/pH. Moreover, the proposed sensor showed a fast response time of 53 s, and acceptable reducibility and repeatability. The highly sensitive and a fast time response of the proposed sensor device indicate its potential application for the monitoring of pH from real samples including biological fluids.

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“…According to the literature, 18 ppy films electrochemically synthesized by cyclic voltammetry method sweeping from 0 to +3 V, presented linear pH sensitivity (increasing resistance as pH increases), differently from the ppy-BPB studied in this work. Therefore, despite the relative high oxidation potential applied during the synthesis (+1.3 V), leading to overoxidation of ppy, 18 we can assume that the nonlinear ohmic behavior observed from ppy-BPB is related to the interaction between ppy and BPB.At this point it is also interesting to mention the film thickness influence on pH sensitivity of ppy. According to the literature, 18,26,40 thinner films usually appeared to present better pH sensitivity than thicker ones.…”

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confidence: 95%

“…Therefore, despite the relative high oxidation potential applied during the synthesis (+1.3 V), leading to overoxidation of ppy, 18 we can assume that the nonlinear ohmic behavior observed from ppy-BPB is related to the interaction between ppy and BPB.…”

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pH effects on the ohmic properties of bromophenol blue-doped polypyrrole film

Ferreira

Girotto

2010

J. Braz. Chem. Soc.

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A resposta ôhmica durante medidas de resistência in situ de filmes de polipirrol (ppy) dopados com azul de bromofenol (BPB) foi analisada para se estudar o efeito do pH nas propriedades analíticas dos filmes. As moléculas de BPB foram inseridas na matriz polimérica através de síntese eletroquímica sobre eletrodos digitalizados de ouro. Os filmes de ppy-BPB não apresentaram diminuição da resistência ôhmica linear com relação ao aumento do pH do meio, no intervalo de 1,5 a 11, sendo observado um aumento da resistência do filme após imersão em pH 7,5. O comportamento não linear é uma desvantagem para a aplicação do ppy-BPB como sensor de pH, no entanto, importantes informações sobre a interação entre o dopante e o polímero conjugado podem ser obtidas deste sistema. O comportamento ôhmico do filme de ppy-BPB pode ser explicado em termos da variação no equilíbrio entre as formas neutra e aniônica do corante preso na matriz de ppy. O estudo neste trabalho contribui para o desenvolvimento de sensores eficientes baseados em polímeros condutores.The ohmic response of bromophenol blue (BPB) doped polypyrrole (ppy) films obtained by in situ resistance measurements was studied to evaluate the pH effect on their analytical properties. BPB molecules were inserted into the ppy matrix by electrochemical synthesis onto digitized gold electrodes. Ppy-BPB films do not present decrease in the linear ohmic resistance when increasing pH values over the pH range 1.5-11.0, displayed by an increase in resistance after immersion in pH 7.5. The nonlinear behavior is a disadvantage for the application of the ppy-BPB film as pH sensor, however, meaningful information about the interaction between the dopant and the conjugated polymer can be obtained from the system. The ohmic behavior of the ppy-BPB films are explained in terms of the equilibrium between neutral and anionic dye species embedded in the ppy matrix. This work brings important contributions to the development of efficient conducting polymer-based sensors.Keywords: polypyrrole, bromophenol blue, ohmic properties, doped films IntroductionConducting polymers are well known materials with interesting optical, magnetic and electrical properties. 1-3The oxidation process in the electronic structure of a heterocyclic conjugated polymer, such as polypyrrole (ppy), 4,5 leads to the formation of polaron and bipolaron states. These energy states are related to remarkable properties of conjugated polymers that take place with the introduction of anion dopants into the polymer matrix to stabilize those charges (polaron and bipolaron) formed during oxidation. 6 The dopant used during the polymer synthesis can directly affect the electrical and structural properties of the conjugated polymer. 2,7,8 Study of the interaction between polymer and dopant is meaningful for the comprehension and applications of these materials. 9The literature have demonstrated the application of electroactive conjugated polymers in the solar cells development, 10,11 organic light-emitting devices, 12,13 and electro...

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Potentiometric miniaturized pH sensors based on polypyrrole films

Cited by 93 publications

References 19 publications

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

pH effects on the ohmic properties of bromophenol blue-doped polypyrrole film

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