Synergistic g-C₃N₄@SnO₂ nano heterostructures and their application for enhanced humidity sensing

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Development of advanced materials for environmental monitoring is crucial.
• Efficient humidity sensors are needed for various applications.
• Nanocomposite materials offer unique properties for sensing applications.

Purpose of the Study:

• To synthesize and characterize g-C₃N₄@SnO₂ nanocomposites for humidity sensing.
• To investigate the structural, optical, and sensing properties of the composite materials.
• To evaluate the performance of the nanocomposites as humidity sensors.

Main Methods:

• Solvothermal synthesis of SnO₂ nanoparticles.
• In situ coupling with g-C₃N₄ sheets via a solid-state process.
• Characterization using XRD, FTIR, XPS, FESEM, and FETEM.
• Fabrication of humidity sensors by screen printing.

Main Results:

• Successful formation of g-C₃N₄@SnO₂ nanocomposites with 20-50 nm SnO₂ nanoparticles.
• Enhanced charge separation observed due to red-shifted optical absorption and suppressed photoluminescence.
• The 15 wt% g-C₃N₄@SnO₂ composite demonstrated high sensitivity (20.2 Ω/%RH), rapid response (25 s), and recovery (45 s) times.
• Stable sensor operation was achieved in the 20-80% RH range.

Conclusions:

• g-C₃N₄@SnO₂ nanocomposites are highly efficient humidity-sensing materials.
• The developed materials show potential for next-generation ultrasensitive and fast-response humidity sensors.
• This work provides a promising platform for advanced humidity detection technologies.