Nanostructured Based Electrochemical Sensors

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Development of sensitive and selective electrochemical sensors is crucial for environmental monitoring and diagnostics.
• Nanostructured materials offer high surface area and unique electrochemical properties for enhanced sensor performance.

Purpose of the Study:

• To investigate the electrochemical behavior of nanostructured materials, specifically Pd and Cu nanowires for hydrogen peroxide detection, and NiO thin films or Ni@NiO core-shell nanowires for mercury ion detection.
• To fabricate and characterize stable, high-surface-area nanostructured electrodes.

Main Methods:

• Ordered arrays of Pd and Cu nanowires synthesized via displacement deposition using a polycarbonate membrane template.
• Fabrication of Ni/NiO electrochemical sensors through mild thermal oxidation of Ni-foil, including Ni@NiO core-shell nanowires.
• Characterization using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-ray Spectroscopy (EDS).
• Electrochemical testing to evaluate sensor performance metrics like sensitivity, selectivity, and accuracy.

Main Results:

• Stable nanostructured electrodes of Pd and Cu with high surface area were successfully prepared.
• Ni/NiO sensors and Ni@NiO core-shell nanowires showed promising results for mercury ion detection.
• Optimization of oxidation time and temperature was performed for Ni@NiO nanowire arrays.
• Electrochemical tests confirmed high sensitivity, selectivity, and accuracy for the developed sensors.

Conclusions:

• Nanostructured Pd, Cu, and NiO-based materials are effective for developing high-performance electrochemical sensors.
• The fabrication methods yield stable electrodes with excellent sensing capabilities.
• The developed sensors show significant potential for accurate detection of hydrogen peroxide and mercury ions.