Copper(II) modified carbon paste electrodes based on self-assembled mercapto compounds-gold-nanoparticle

Area of Science:

• Electroanalytical Chemistry
• Materials Science

Background:

• Development of selective and sensitive sensors for metal ion detection is crucial.
• Carbon paste electrodes modified with nanomaterials offer promising platforms for electrochemical sensing.

Purpose of the Study:

• To develop and characterize self-assembled gold nanoparticle (SAGNP) modified carbon paste electrodes (CPEs) for the potentiometric determination of Cu(II) ions.
• To evaluate the performance of electrodes modified with three different mercapto compounds: MMNIT, MNFT, and MNTT.

Main Methods:

• Synthesis and characterization of SAGNP-modified CPEs using MMNIT, MNFT, and MNTT.
• Potentiometric measurements for Cu(II) ion determination.
• Evaluation of Nernstian slope, detection limits, response time, and pH range.
• Selectivity studies against interfering ions.
• Application in real samples (hair and water).

Main Results:

• The electrodes exhibited Nernstian slopes for Cu(II) over wide concentration ranges.
• Detection limits were as low as 3.5 (+/-0.2)x10(-9) mol L(-1).
• The sensors showed stable potentiometric responses across a broad pH range and possessed quick response times (~5 s).
• Good selectivity was observed against various metal ions.
• Successful application in the determination of Cu(II) in hair and water samples.

Conclusions:

• SAGNP-modified CPEs using MMNIT, MNFT, and MNTT are effective for the sensitive and selective potentiometric determination of Cu(II) ions.
• The developed sensors demonstrate potential for practical applications in environmental and biological sample analysis.
• The use of mercapto compounds and gold nanoparticles provides a robust platform for electrochemical sensor development.