Ag-Modified Porous Perovskite-Type LaFeO₃ for Efficient Ethanol Detection

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Perovskite (ABO3) nanosheets are promising gas-sensitive materials due to their unique properties.
• High carrier mobility, crystal structure, and stability contribute to their gas reactivity.
• Developing efficient and selective gas sensors remains a critical challenge.

Purpose of the Study:

• To synthesize silver (Ag) in situ modified porous lanthanum ferrite (LaFeO3) nanosheets.
• To evaluate their performance for sensitive and selective ethanol detection.
• To explore a new strategy for P-type ABO3 perovskite-based gas sensors.

Main Methods:

• Graphene oxide (GO)-assisted co-precipitation method for synthesizing Ag/LaFeO3 nanosheets.
• Optimization of Ag modification ratio, with 5% Ag showing the best results.
• Gas sensing measurements at 180 °C to assess ethanol detection capabilities.

Main Results:

• Ag/LaFeO3 nanomaterials exhibited a high sensing response (20.9) to 20 ppm ethanol.
• Achieved fast response (26 s) and recovery (27 s) times.
• Demonstrated significant selectivity for ethanol over other interfering gases.

Conclusions:

• The combination of porous nanomaterials and noble metal sensitization enhances gas-sensing performance.
• Ag-modified LaFeO3 nanosheets show great potential for sensitive and selective ethanol detection.
• This strategy provides a new pathway for developing advanced perovskite-based gas sensors.