A Reagentless Amperometric Formaldehyde-Selective Chemosensor Based on Platinized Gold Electrodes

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Formaldehyde analysis is crucial for industrial, research, and environmental monitoring.
• Existing methods may lack selectivity or sensitivity.
• Development of novel, high-performance chemosensors is needed.

Purpose of the Study:

• To fabricate and characterize a novel amperometric chemosensor for formaldehyde detection.
• To enhance selectivity and sensitivity using platinized gold electrodes.
• To evaluate the sensor's stability and applicability in real-world samples.

Main Methods:

• Electrochemical platinization of gold planar electrodes via electrolysis and cyclic voltammetry.
• Characterization using scanning electron microscopy and X-ray spectral analysis.
• Amperometric detection at a low working potential (0.0 V vs. Ag/AgCl).

Main Results:

• Achieved high sensitivity (28180 A·M⁻¹·m⁻²) and a low detection limit (0.05 mM) for formaldehyde.
• Demonstrated excellent selectivity at a low working potential.
• Exhibited stability over a one-year storage period.
• Showed high correlation (R=0.998) with chemical and enzymatic methods in commercial samples.

Conclusions:

• The developed platinized gold electrode-based amperometric chemosensor provides accurate and sensitive formaldehyde analysis.
• The sensor's stability and high performance make it suitable for diverse applications.
• This technology holds significant potential for industrial quality control, research, and environmental monitoring.