کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9634244 | 463409 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Raman based pH measurements with polyaniline
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The reversible acid-base equilibrium between the emeraldine salt (ES) and the emeraldine base (EB) form of thin electropolymerized films of polyaniline (PANI) has been studied between pH 2 and 9 with in situ Raman spectroscopy using the 514, 633 and 780Â nm laser excitation wavelengths. The electropolymerization of PANI was done with cyclic voltammetry in a flow cell from a solution consisting of 50Â mM aniline and 1.0Â M HCl. It is shown that the Raman signal of the CN stretching vibration at 1439Â cmâ1, originating from the quinoid units of the EB form, can be used for pH measurements between pH 3 and 6 with the 633Â nm laser. This vibration is strongly resonance enhanced by the 633Â nm laser and its intensity grows therefore considerably in the pH interval where the ES-EB transition mainly takes place (pH 3-6). The influence of the film conditioning pH was also studied as well as the reproducibility of the Raman spectra when pH was changed several times from pH 6 to 3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 580, Issue 2, 1 July 2005, Pages 320-329
Journal: Journal of Electroanalytical Chemistry - Volume 580, Issue 2, 1 July 2005, Pages 320-329
نویسندگان
Tom Lindfors, Ari Ivaska,