Silver Enhances Hematite Nanoparticles Based Ethanol Sensor Response and Selectivity at Room Temperature.

Area of Science:

• Materials Science
• Chemical Sensors
• Nanotechnology

Background:

• Semiconductor gas sensors are vital for monitoring volatile organic compounds (VOCs).
• Existing sensors often rely on expensive materials and high operating temperatures, posing limitations.
• Developing cost-effective, room-temperature gas sensors is a significant challenge.

Purpose of the Study:

• To develop a novel, low-cost ethanol gas sensor operating at room temperature.
• To investigate the performance enhancement of hematite (α‑Fe2O3) using silver nanoparticles (AgNPs).
• To enable sensitive and selective quantification of ethanol vapor for practical applications.

Main Methods:

• Synthesis of hematite (α‑Fe2O3) decorated with silver nanoparticles (AgNPs).
• Fabrication of a gas sensor device utilizing the α-Fe2O3/Ag nanocomposite.
• Testing sensor performance for ethanol vapor detection at ambient temperature (25 °C).

Main Results:

• The α-Fe2O3/Ag nanocomposite demonstrated enhanced ethanol adsorption and charge carrier density.
• The sensor achieved sensitive and selective detection of ethanol in the 2-35 mg L⁻¹ range.
• An excellent linear relationship was observed for ethanol quantification.
• The sensor operates effectively at room temperature, overcoming a key technological drawback.

Conclusions:

• Hematite/silver nanoparticle composite offers a promising, low-cost solution for room-temperature ethanol sensing.
• The enhanced performance makes it suitable for breath analyzers and industrial monitoring in the food and beverage sectors.
• This work advances ambient temperature gas sensing as a viable alternative for VOC quantification.