Ozone sensing based on palladium decorated carbon nanotubes

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Multiwall carbon nanotubes (MWCNTs) are promising materials for sensor applications.
• Palladium nanoparticles (Pd NPs) offer unique catalytic and electronic properties.
• Ozone (O₃) detection is crucial for environmental monitoring and industrial safety.

Purpose of the Study:

• To develop an efficient and reproducible sensor for ozone detection.
• To decorate MWCNTs with palladium nanoparticles using a vapor-phase method.
• To characterize the sensor performance for ozone at various temperatures.

Main Methods:

• Vapor-phase impregnation-decomposition of palladium acetylacetonates onto MWCNTs.
• Fabrication of a sensor device using a MWCNTs-Pd sensitive film deposited on interdigitated electrodes.
• Resistance-based measurements of sensor response to ozone at different temperatures.

Main Results:

• Successfully synthesized Pd-decorated MWCNTs (MWCNTs-Pd).
• The MWCNTs-Pd sensor demonstrated a resistance change upon exposure to ozone.
• The sensor detected ozone concentrations as low as 20 ppb with a response time of 60 s.
• Optimal sensor performance was observed at 120 °C.
• The sensor exhibited high repeatability, reproducibility, and efficient recovery.

Conclusions:

• The developed MWCNTs-Pd sensor is a viable candidate for ozone detection.
• The vapor-phase synthesis method provides an efficient route for creating functionalized nanomaterials.
• The sensor's performance characteristics make it suitable for practical ozone monitoring applications.