Electroactive polymers in chemical sensors

Josowicz, Mira; Janata, Jiřı́

doi:10.1007/978-94-011-1568-1_10

Cited by 55 publications

(3 citation statements)

References 62 publications

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“…Therefore a comparison of the voltammetric responses of PANI in solutions containing different ions became the starting point of our study. We have been interested in using these materials as sensing layers for gases (i.e., in dry state) . Moreover, it is desirable to prepare dry PANI sensing layers with different stable redox states.…”

Section: Introductionmentioning

confidence: 99%

Acid Doping of Polyaniline: Spectroscopic and Electrochemical Studies

1999

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A detailed investigation of the acid doping behavior of polyaniline has led to a robust and reproducible procedure for controlled adjustment of the redox state of dry polyaniline films. The initial step in this procedure is the casting of PANI films from formic acid. The subsequent exchange of the trapped formic acid for other primary dopants obtained from mono-and polyprotic acids (e.g., CH 3 COO -, BF 4 -, HSO 4 -, SO 4 2-, H 2 PO 4 -, and HPO 4 2-) is demonstrated. The voltammetric and the spectroscopic behavior of the PANI doped with different anions indicate that both the protons and the anions of dopant acids influence the structure and redox properties of the polymer. The redox state of PANI doped with homologous series of chloroacetic and carboxylic acids correlates with the pK a of the dopant acid. These results show that it is possible to prepare the polymer with a desired oxidation state according to the pK a of the dopant acid of a given homologous series. The exchange of the formic acid for both stronger and weaker doping acid can be repeatedly accomplished by electrochemical cycling.

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Section: Introductionmentioning

confidence: 99%

Acid Doping of Polyaniline: Spectroscopic and Electrochemical Studies

1999

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“…The unresponsive nature of PMMA-coated SPR chips to 4% ammonia confirms that in order to achieve low-ppm detection limits, physical swelling of a polymer without some form of polymer-analyte affinity cannot be relied upon as the sole phenomenon responsible for SPR shifts. Application of PAni-based coatings (polymer coating 2) to ammonia gas sensing have been extensively discussed in the literature [38][39][40]. In particular, the conducting emeraldine salt form of PAni has attractive electrical properties that display a sensitivity towards redox-active doping species (e.g.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of polymer coatings for ammonia vapor sensing with surface plasmon resonance spectroscopy

Banerji

Peng

Kim

et al. 2010

Sensors and Actuators B: Chemical

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“…It is important in defining the “ON/OFF” ratio, which is often used as the figure of merit in the description of OFET. Threshold voltage is also important in ChemFETs because the chemical modulation of the WF of the OS causes the shift of V T . ,, Equations 1 describe the well-known transistor characteristics of classical Si-based IGFET. It is therefore not surprising that any deviation from the shape of these ideal characteristics is the first indication of a potential problem in devices that depend on analogous semiconductor field-effect in OS.…”

Section: Introductionmentioning

confidence: 99%

Chemical Effects in Organic Electronics

et al. 2004

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Effects of the chemical environment on devices utilizing organic semiconductors are discussed. It is convenient and justified to use silicon-based insulated gate field-effect transistors (IGFET) as the yardstick by which the performance of organic field-effect transistors (OFET) are measured. However, the same issues may apply to other types of devices utilizing organic semiconductors (OS). The focus of this article is on chemical modulation of the critical parts of these devices, specifically on the bulk electronic properties, contacts between the metal and OS, and interface between the OS and the insulating support. Controlled interactions between the chemical environment and the solid-state devices have been well documented and utilized in chemical sensors. On the other hand, uncontrolled chemical interactions with a solid-state device may lead to experimental artifacts in electronics that is intended for signal and information processing.

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Electroactive polymers in chemical sensors

Cited by 55 publications

References 62 publications

Acid Doping of Polyaniline: Spectroscopic and Electrochemical Studies

Acid Doping of Polyaniline: Spectroscopic and Electrochemical Studies

Evaluation of polymer coatings for ammonia vapor sensing with surface plasmon resonance spectroscopy

Chemical Effects in Organic Electronics

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