CeO₂ Enhanced Ethanol Sensing Performance in a CdS Gas Sensor

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Cadmium sulfide (CdS) nanowires (NWs) are explored for gas sensing.
• Enhancing the sensitivity and selectivity of CdS-based sensors is crucial for practical applications.
• Cerium dioxide (CeO₂) is a promising material for modifying semiconductor properties.

Purpose of the Study:

• To fabricate CeO₂-decorated CdS nanowires.
• To investigate the ethanol sensing performance of the composite material.
• To evaluate the impact of CeO₂ content on sensor characteristics.

Main Methods:

• Low-temperature solvothermal synthesis of CdS nanowires.
• Modification of CdS NWs with CeO₂ nanoparticles.
• Gas sensing measurements of pure CdS and CeO₂/CdS composites towards ethanol.

Main Results:

• CeO₂ decoration significantly improved the ethanol sensing performance of CdS NWs.
• The 5 at% CeO₂/CdS composite demonstrated a 2.6-fold increase in response to 100 ppm ethanol compared to pure CdS.
• The composite exhibited fast response/recovery times (<12 s/<3 s) and excellent selectivity.

Conclusions:

• CeO₂-decorated CdS NWs show enhanced ethanol sensing capabilities.
• The composite material is a promising candidate for developing high-performance ethanol sensors.
• The study highlights the potential of nanomaterial modification for advanced gas sensing solutions.