Layer-by-layer films based on carbon nanotubes and polyaniline for detecting 2-chlorophenol

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Electrochemical sensors offer sensitive detection methods.
• Layer-by-layer (LbL) assembly enables precise nanomaterial film fabrication.
• Polyaniline (PAni) and multi-walled carbon nanotubes (MWCNTs) are promising materials for sensor development.

Purpose of the Study:

• To develop and characterize an electrochemical sensor for 2-chlorophenol detection.
• To investigate the synergistic effects between MWCNTs-COO- and PAni in LbL films.
• To assess the performance of the sensor at low concentrations.

Main Methods:

• Fabrication of LbL films of MWCNTs-COO- and PAni on ITO substrates.
• Electrochemical analysis using square wave voltammetry (SWV).
• Material characterization using FTIR, Raman spectroscopy, and Scanning Electron Microscopy (SEM).

Main Results:

• The developed sensor detected 2-chlorophenol at concentrations down to the ppm level.
• Synergistic effects between MWCNTs-COO- and PAni significantly enhanced sensor performance.
• FTIR and Raman spectroscopy confirmed molecular-level interactions within the LbL films.
• SEM images showed homogeneous nanocomposite formation.
• Raman spectra indicated preserved conducting properties of PAni on ITO substrates.

Conclusions:

• LbL assembly of MWCNTs-COO- and PAni creates effective electrochemical sensors for 2-chlorophenol.
• The sensor exhibits high sensitivity and stability due to synergistic interactions and preserved conductivity.
• This approach provides a promising platform for sensitive environmental pollutant detection.