مطالعه تجزیه گرما وزن سنجی ، امپدانسی و ریخت ‌شناسی کُپلیمر ،پایرول-فرمیل پایرول سنتز شده از طریق الکترو پلیمریزاسیون

نوع مقاله : مقاله پژوهشی

نویسنده

• مهرداد غلامی

استادیار، گروه شیمی، شیمی تجزیه، دانشگاه آزاد اسلامی واحد مرودشت، فارس، ایران

10.30495/jnm.2022.14727.1568

چکیده

در این مطالعه کُپلیمر پایرول-فرمیل پایرول (Py-co-FPy) از طریق الکتروپلیمریزاسیون در جریان ثابت 480 µA برای مدت 200 ثانیه در محلول آبی لیتیم پر کلرات، پایرول (Py) و فرمیل پایرول ( FPy)سنتز میگردد. خصوصیات کُپلیمر پایرول-فرمیل پایرول با میکروسکوپ الکترونی گسیل میدانی FESEM ، میکروسکوپ الکترونی عبوری روبشی STEM ، تجزیه گرما وزن سنجی TGA و طیف سنجی امپدانس الکتروشیمیایی EIS مورد مطالعه قرار گرفت. تصاویر گرفته شده توسط میکروسکوپ الکترونی گسیل میدانی نشان میدهند که کُپلیمر پایرول-فرمیل پایرول (Py-co-FPy) سنتز شده دارای ساختار مارپیچی حلزون مانند تو خالی می باشد. نتایج مطالعات امپدانسی همچنین نشان می دهند که کُپلیمر پایرول-فرمیل پایرول جریان یونها را از میان کُپلیمر پایرول-فرمیل پایرول به سطح الکترود افزایش میدهد، به طوریکه رسانایی الکترونی کُپلیمر پایرول-فرمیل پایرول 2.5 برابر بیشتر از پلی پایرول می باشد. ساختار رزنانس مزدوج بین پایرول (Py) و فرمیل پایرول ( FPy)در حضور گروه متین باعث افزایش رسانایی کُپلیمر پایرول-فرمیل پایرول نسبت به پلی پایرول (PPy) است. با توجه به رسانایی بالای کُپلیمر پایرول-فرمیل پایرول، این ترکیب میتواند کاربردهای متعددی رادر حسگرها ، بیو حسگرها، باتریها و ابر خازنها از آن بدست اورد. نتایج تجزیه گرما وزن سنجی نشان می دهند که کُپلیمر پایرول-فرمیل پایرول دارای پایداری حرارتی بیشتری از پلی پایرول است.

کلیدواژه‌ها

• کُپلیمر پایرول-فرمیل پایرول
• الکتروپلیمریزاسیون
• طیف سنجی امپدانس الکتروشیمیایی

20.1001.1.22285946.1400.12.46.4.5

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عنوان مقاله [English]

The gravimetric,, impedance, and morphology study of pyrrole-formylpyrrole copolymer synthesized by electro-polymerization

نویسنده [English]

• Mehrdad Gholami

. Assistant Prof. of Analytical Chemistry, Department of Chemistry, Islamic Azad University of Marvdasht, Analytical Chemistry, Marvdasht, Iran.

چکیده [English]

In this study a direct electrochemical copolymerization of pyrrole-formyl pyrrole (Py-co-FPy) was carried out by copolymerization of formyl pyrrole and pyrrole in LiClO4 aqueous solution under constant current of 480 µA for 200 s. The (Py-co-FPy) copolymer was characterized using field emission scanning electron microscope (FESEM), energy-filtering transmission electron microscope (EFTEM), thermal gravimetric analysis (TGA) and Electrochemical Impedance Spectroscopy (EIS). The FESEM images showed that the synthesized copolymer had a hollow whelk-like helixes structure. Moreover, the whorls on the bodies of (Py-co-FPy) copolymer whelk have well-ordered periodic nanostructures that provides a great high ratio of surface to volume. The Impedance study results confirm that (Py-co-FPy) copolymer layer can improve the electron conduction 2.5 times higher than PPy. The conjugated structure between Py and FPy in the presence of methine group can cause the enhancement of conductivity compared to polypyrrole. TGA analysis reveals that the Py-co-PPy copolymer has more thermal stability compared to polypyrrole.

کلیدواژه‌ها [English]

• pyrrole- formyl pyrrole copolymer
• electropolymerization
• impedance spectroscopy

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