کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1267207 1496923 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, characterization and modification of functionalized pyrimidine stabilized gold nanoparticles on ITO electrode for the determination of tannic acid
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Synthesis, characterization and modification of functionalized pyrimidine stabilized gold nanoparticles on ITO electrode for the determination of tannic acid
چکیده انگلیسی

This paper describes the synthesis of 4-amino-6-hydroxy-2-mercaptopyrimidine capped gold nanoparticles (AHMP-AuNPs) in aqueous medium and their immobilization on indium tin oxide (ITO) electrode modified with (3‐mercaptopropyl)trimethoxysilane (MPTS) sol–gel for the determination of tannic acid (TA). The high resolution transmission electron microscopy (HR-TEM) images show that the particles are spherical in shape with a diameter of ~ 6 nm. The heterogeneous electron transfer rate constant (ket) of [Fe(CN)6]3 −/4 − at ITO/MPTS/AHMP-AuNPs electrode was found to be 1.14 × 10− 7 m/s. This value was much higher than the values obtained at ITO/MPTS (4.94 × 10− 9 m/s) and bare ITO (8.79 × 10− 8 m/s) electrodes, indicating that the electron transfer reaction was faster at AuNPs modified electrode. Further, the ITO/MPTS/AHMP-AuNPs electrode shows excellent electrocatalytic activity toward TA oxidation when compared to bare ITO electrode. This was understood from the obtained higher heterogeneous rate constant (ks) value at AuNPs modified electrode (7.35 × 10− 5 m/s) than at bare ITO electrode (5.45 × 10− 6 m/s). Using the amperometry method, detection of 20 nmol/L TA was achieved. The practical application of the present method was demonstrated by determining the concentration of TA in commercial beer samples.


► Functionalized pyrimidine capped gold nanoparticles were prepared in water.
► Synthesized AuNPs were immobilized on ITO electrode using MPTS sol–gel as linker.
► AuNPs modified electrode was used for the determination of tannic acid (TA).
► The modified electrode showed a detection limit of 1.26 × 10− 10 M for TA.
► Modified electrode was successfully used for the determination of TA in beer samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioelectrochemistry - Volume 89, February 2013, Pages 1–10
نویسندگان
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