An Ultrahigh Sensitivity Acetone Sensor Enhanced by Light Illumination.

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Developing highly sensitive and selective gas sensors is crucial for environmental monitoring and industrial safety.
• Metal oxide semiconductors are widely explored for gas sensing applications, but often require high operating temperatures.
• Optimizing sensor performance at lower temperatures remains a key challenge.

Purpose of the Study:

• To synthesize and characterize a novel Au:SmFe₀.₉Zn₀.₁O₃ material for acetone gas sensing.
• To investigate the effect of light illumination on the sensor's performance, particularly at lower operating temperatures.
• To evaluate the sensor's sensitivity, selectivity, and stability towards acetone vapor under varying conditions.

Main Methods:

• Sol-gel synthesis of Au:SmFe₀.₉Zn₀.₁O₃ nanoparticles.
• Material characterization using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and X-ray Photoelectron Spectroscopy (XPS).
• Gas sensing measurements under varying temperatures, relative humidity, and light illumination (different wavelengths).

Main Results:

• The synthesized material exhibited an average particle size of approximately 50 nm.
• The sensor demonstrated high sensitivity and selectivity towards acetone vapor.
• Light illumination, especially with shorter wavelengths, significantly improved acetone sensing performance at lower temperatures.
• Increased relative humidity led to decreased sensor resistance and sensitivity.

Conclusions:

• Au:SmFe₀.₉Zn₀.₁O₃ is a promising material for acetone gas sensing.
• Light irradiation offers an effective strategy to enhance sensor performance and reduce operating temperature.
• The sensor exhibits excellent selectivity and stability for acetone detection, making it suitable for practical applications.