SnO2 quantum dot decoration of CuO nanoparticles with enhanced NO2 and H2 gas sensing response via p–n heterojunction interfaces

Key Points

• The novel SnO2-QD/CuO nanocomposite significantly improves sensitivity for NO2 and H2 gas detection.
• Sensitivity is enhanced through the presence of p–n heterojunctions, facilitating effective charge transfer.
• Gas sensing tests were conducted at 100 °C, demonstrating effectiveness over a range of concentrations.
• This approach supports the development of more efficient nanosensors for environmental monitoring.