کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5211331 | 1382945 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrocatalytic thin films based on nordihydroguaiaretic acid-functionalyzed polyaniline
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
A novel composite, polymeric material can be obtained by potential cycling of polyaniline (PANI)-modified electrode in the presence of nordihydroguaiaretic acid (NDGA). As a consequence, the properties of PANI change from those of a conducting polymer to those of a redox polymer. Thus formed composite PANI-NDGA films show redox activity characterized by two new electrochemical couples observed at mid-peak potentials of 0.32 and 0.52 V (vs. Ag/AgCl, 0.5 M H2SO4). The peak currents exhibit a linear dependence on the potential scan rate as expected for surface-confined redox species and the peak potentials shift toward lower potentials with increasing solution pH at a rate of ca. 60 mV/pH unit. The PANI-NDGA composite film was found to electrocatalyze the reduction of iodate in acidic (pH 1.8) Britton-Robinson buffer. The modified electrode could be applied as an amperometric sensor for iodate. A linear dependence between the reduction current and iodate concentration was observed over the range of 1-100 μM with a detection limit of 0.05 μM. The observed restructuring of PANI in the presence of NDGA was confirmed by AFM imaging and FT-IR spectroscopy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 68, Issue 11, November 2008, Pages 1542-1548
Journal: Reactive and Functional Polymers - Volume 68, Issue 11, November 2008, Pages 1542-1548
نویسندگان
Grzegorz Milczarek,