Single-Piece All-Solid-State Potential Ion-Selective Electrodes Integrated with Molecularly Imprinted Polymers (MIPs)...

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Conventional ion-selective electrodes (ISEs) often face challenges with stability and charge transfer.
• Polyaniline (PANI) is a conductive polymer with potential applications in electrochemical sensing.
• Improving the performance of screen-printed electrodes (SPEs) is crucial for developing portable analytical devices.

Purpose of the Study:

• To develop a novel single-piece all-solid-state ion-selective electrode (SC/ISE) based on a carbon-screen printed substrate.
• To investigate the effect of incorporating polyaniline (PANI) into the sensing membrane for enhanced charge transfer and stability.
• To evaluate the sensor's performance for the detection of 2,4-dichlorophenol (DCP) in aqueous samples.

Main Methods:

• Fabrication of SC/ISE by drop-casting a PANI-containing membrane onto a carbon-screen printed electrode.
• Utilizing a non-equilibrium sensing mechanism for DCP detection.
• Assessing sensor selectivity using the modified separate solution method (MSSM).
• Evaluating potential stability via constant-current chronopotentiometry.
• Validating sensor applicability by analyzing real water samples and comparing with High-Performance Liquid Chromatography (HPLC).

Main Results:

• The developed SC/ISE exhibited high sensitivity towards 2,4-DCP within a linearity range of 0.47 to 13 µM, with a detection limit of 0.13 µM.
• The PANI-modified electrode demonstrated good selectivity for 2,4-DCP over common interfering ions.
• Incorporation of PANI significantly improved the potential stability of the screen-printed electrode compared to a control electrode.
• The sensor showed practical applicability in detecting 2,4-DCP in various water samples, with results comparable to the HPLC method.

Conclusions:

• The novel single-piece all-solid-state ion-selective electrode based on carbon-screen printing and polyaniline offers a promising platform for sensitive and stable detection of 2,4-dichlorophenol.
• The use of PANI as an intermediary layer effectively enhances charge transfer and potential stability, making the sensor suitable for practical environmental monitoring.
• This PANI-modified SC/ISE presents a cost-effective and efficient alternative for the analysis of 2,4-DCP in water samples.