ZnO nanoflowers modified with RuO₂ for enhancing acetone sensing performance

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Metal oxide semiconductor gas sensors are crucial for environmental monitoring.
• Surface modification is a key strategy to enhance sensor performance.
• Zinc oxide (ZnO) is a promising semiconductor material for gas sensing applications.

Purpose of the Study:

• To improve the sensing performance of ZnO-based gas sensors.
• To investigate the effect of RuO2 surface modification on ZnO nanoflowers.
• To understand the mechanism behind the enhanced gas sensing.

Main Methods:

• Fabrication of marigold-shaped ZnO nanoflowers via precipitation.
• Catalytic surface modification with RuO2 using ethylene glycol solvothermal treatment.
• Characterization of modified materials and gas sensing performance evaluation.

Main Results:

• RuO2 was successfully deposited on ZnO nanoflowers in an oxidized state.
• Acetone gas response improved by 17 times at 100 ppm.
• Optimal operating temperature decreased from 219 °C to 172 °C.
• Recovery time reduced from 79s to 52s.

Conclusions:

• RuO2 surface modification significantly enhances the acetone sensing performance of ZnO nanoflowers.
• The enhancement is attributed to the formation of p-n heterostructures and catalytic effects.
• The modified sensor offers improved sensitivity, lower operating temperature, and faster response/recovery times.