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Comparative Studies on Carbon Paste Electrode Modified with Electroactive Polyamic Acid and Corresponding Polyimide
Jiunn-Jer Hwang1, Aamna Bibi2, Yu-Ci Chen2
1Department of Chemical Engineeing, Army Academy, Taoyuan 32023, Taiwan.
Polymers
|September 9, 2022
Summary
Sulfonated electroactive polymers (S-EPAA) enhance electrochemical sensing of ascorbic acid (AA). S-EPAA modified electrodes show superior sensitivity and selectivity for AA detection compared to other polymer modifications.
Area of Science:
- Electrochemistry
- Materials Science
- Polymer Chemistry
Background:
- Ascorbic acid (AA) detection is crucial in various fields.
- Developing sensitive and selective electrochemical sensors is an ongoing challenge.
- Electroactive polymers (EAPs) offer promising properties for sensor applications.
Purpose of the Study:
- To synthesize and characterize novel electroactive poly (amic acid) (EPAA) and polyimide (EPI) derivatives.
- To investigate the influence of sulfonated groups on the redox capability and sensing performance of EAPs.
- To develop an efficient electrochemical sensor for ascorbic acid (AA) detection.
Main Methods:
- Synthesis of EPAA, EPI, S-EPAA, and S-EPI using amine-capped aniline trimers (ACAT) and sulfonated ACAT.
- Characterization using Fourier-transform infrared (FTIR) spectroscopy.
- Electrochemical evaluation via cyclic voltammetry and differential pulse voltammetry on modified carbon paste electrodes (CPE).
Main Results:
- The redox capability followed the trend: S-EPAA > S-EPI > EPAA > EPI.
- An S-EPAA-modified CPE exhibited significantly higher electro-catalytic activity towards AA oxidation compared to bare CPE and other modified CPEs.
- The S-EPAA-modified CPE demonstrated excellent selectivity for AA in a mixture containing dopamine (DA) and uric acid (UA).
Conclusions:
- Sulfonated electroactive polymers, particularly S-EPAA, significantly enhance electrochemical sensing performance for AA.
- The S-EPAA-modified CPE offers a sensitive, stable, and selective platform for AA detection.
- This study highlights the potential of tailored EAPs for advanced electrochemical sensing applications.
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