CuO-Ga₂O₃ Thin Films as a Gas-Sensitive Material for Acetone Detection

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Gas sensors are crucial for environmental monitoring and safety.
• Metal oxide semiconductors offer promising gas-sensing properties.
• Developing sensitive and selective sensors for volatile organic compounds (VOCs) like acetone is essential.

Purpose of the Study:

• To synthesize and characterize CuO-Ga2O3 p-n heterostructures.
• To investigate the gas-sensing performance of these heterostructures towards low acetone concentrations.
• To evaluate the influence of relative humidity on sensor response.

Main Methods:

• Magnetron sputtering in a reactive mode for CuO-Ga2O3 film deposition.
• Annealing at 400 °C for 4 hours in synthetic air.
• Characterization using X-ray diffraction (XRD), X-ray reflectivity (XRR), and energy-dispersive X-ray spectroscopy (EDS).
• Gas sensing measurements in air/acetone atmosphere (0.1-1.25 ppm) at varying relative humidity (10-85%).

Main Results:

• Successfully fabricated CuO-Ga2O3 p-n heterostructures.
• Demonstrated gas-sensing capabilities for acetone at low concentrations.
• Identified optimal sensor performance for CuO-Ga2O3 with 4% atomic Ga doping.
• Observed significant influence of relative humidity on sensor response.

Conclusions:

• CuO-Ga2O3 heterostructures are effective materials for acetone gas sensing.
• The 4% Ga-doped CuO-Ga2O3 exhibits superior sensitivity to acetone.
• Further research is needed to optimize sensor performance under varying humidity conditions.