Highly Sensitive Potentiometric pH Sensor Based on Polyaniline Modified Carbon Fiber Cloth for Food and
Md Sanwar Hossain1, Narayanasamy Padmanathan2, Md Mizanur R Badal1
1Department of Chemistry, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh.
ACS Omega
|September 30, 2024
Summary
A new potentiometric pH sensor using polyaniline on carbon fiber cloth offers high sensitivity for food and pharmaceutical analysis. This reliable sensor demonstrates robust performance in real-world applications.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Accurate pH monitoring is crucial in food and pharmaceutical industries.
- Existing pH sensors may face limitations in sensitivity, stability, or application scope.
Purpose of the Study:
- To develop a highly sensitive and specific potentiometric pH sensor.
- To evaluate the sensor's performance for food and pharmaceutical applications.
Main Methods:
- Electropolymerization of polyaniline (PANI) on carbon fiber cloth (CFC).
- Characterization using XRD, FESEM, XPS, FTIR, and Raman spectroscopy.
- Electrochemical assessment via cyclic voltammetry (CV) and open-circuit potential (OCP).
- Density Functional Theory (DFT) calculations for ion affinity and reactivity.
Main Results:
- The PANI-CFC sensor achieved a sensitivity of 60.9 mV/pH within the pH range of 4 to 12.
- Demonstrated excellent repeatability, robustness, and accuracy validated with real samples.
- DFT calculations confirmed strong H+ ion affinity (interaction energy of -173.2886 kcal/mol) and a HOMO-LUMO gap of -0.98 eV for PANI.
Conclusions:
- The PANI-CFC sensor is a reliable and efficient platform for potentiometric pH sensing.
- The sensor shows significant potential for applications in the food and pharmaceutical sectors.
- The developed sensor performs robustly in both laboratory and real-world settings.
