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Spectroscopic properties of thin layers of sulfamic acid-doped polyaniline and their application to reagentless determination of nitrite

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Title: Spectroscopic properties of thin layers of sulfamic acid-doped polyaniline and their application to reagentless determination of nitrite
Authors: Dhaoui, Wadia1 Wadia.ammar@planet.tn, Zarrouk, Hedi1, Pron, Adam2
Source: Synthetic Metals. Jul2007, Vol. 157 Issue 13-15, p564-569. 6p.
Subjects: Metals, Inorganic chemistry, Physical sciences, Ores
Abstract: Abstract: Thin layers of sulfamic acid-doped polyaniline (abbreviated PANI-SFA) were prepared on quartz substrates by chemical polymerization using ammonium peroxydisulfate as an oxidizing agent. A specific feature of PANI-SFA is its reactivity towards nitrite anions, which results in significant changes in the UV–vis-NIR spectra of the PANI-SFA layer accompanied with a decrease of its conductivity. The chemical mechanism of these changes can be described as follows: for low nitrite concentration it involves the removal of the dopant via oxidation of amine nitrogen to N2 whereas for higher nitrite concentration an additional phenomenon such as reduction of polyaniline from its semi-oxidized (emeraldine) state to the fully reduced (leucoemeraldine) one takes place. The observed phenomena enabled us to use PANI-SFA layers as optodes for reagentless determination of nitrite. In buffer (pH 2) solutions of nitrites the relative absorbance of the PANI-SFA layer, at 816nm, changes linearly with log C nitrite. For nitrite concentrations exceeding 10−4 M determination based on the dc conductivity measurements is also possible. The optodes can easily be regenerated by treatment with 1M sulfamic acid. [Copyright &y& Elsevier]
Copyright of Synthetic Metals is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 26488590
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  Data: Spectroscopic properties of thin layers of sulfamic acid-doped polyaniline and their application to reagentless determination of nitrite
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  Data: <searchLink fieldCode="JN" term="%22Synthetic+Metals%22">Synthetic Metals</searchLink>. Jul2007, Vol. 157 Issue 13-15, p564-569. 6p.
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  Label: Abstract
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  Data: Abstract: Thin layers of sulfamic acid-doped polyaniline (abbreviated PANI-SFA) were prepared on quartz substrates by chemical polymerization using ammonium peroxydisulfate as an oxidizing agent. A specific feature of PANI-SFA is its reactivity towards nitrite anions, which results in significant changes in the UV–vis-NIR spectra of the PANI-SFA layer accompanied with a decrease of its conductivity. The chemical mechanism of these changes can be described as follows: for low nitrite concentration it involves the removal of the dopant via oxidation of amine nitrogen to N2 whereas for higher nitrite concentration an additional phenomenon such as reduction of polyaniline from its semi-oxidized (emeraldine) state to the fully reduced (leucoemeraldine) one takes place. The observed phenomena enabled us to use PANI-SFA layers as optodes for reagentless determination of nitrite. In buffer (pH 2) solutions of nitrites the relative absorbance of the PANI-SFA layer, at 816nm, changes linearly with log C nitrite. For nitrite concentrations exceeding 10−4 M determination based on the dc conductivity measurements is also possible. The optodes can easily be regenerated by treatment with 1M sulfamic acid. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Synthetic Metals is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.synthmet.2007.06.004
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      – Code: eng
        Text: English
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      – SubjectFull: Inorganic chemistry
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      – SubjectFull: Physical sciences
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              Text: Jul2007
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