Development of a detection sensor for lethal H2S gas.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Hydrogen sulfide (H2S) is a toxic gas posing risks in industrial settings.
• Short-term exposure can cause olfactory paralysis, central nervous system, and lung damage.
• Effective H2S gas sensors are crucial for workplace safety.

Purpose of the Study:

• To investigate the response and selectivity of a thick-film semiconductor sensor for hydrogen sulfide (H2S) gas detection.
• To optimize sensor performance by exploring various operating temperatures and catalysts.
• To develop a sensor for detecting toxic gases generated from organic waste residues.

Main Methods:

• Fabrication of WO3/SnO2 thick-film semiconductor sensors using sol-gel and precipitation methods.
• Doping nanosized SnO2 powder with various metal oxides (WO3, TiO2, ZnO) and transition metals (Au, Ru, Pd, Ag, In).
• Characterization of sensor materials using SEM, BET, and XRD analyses; sensor response measured as resistance ratio (Ra/Rg) in air versus H2S gas.

Main Results:

• The highest response and selectivity for H2S gas were achieved with SnO2 doped with 1 wt% Ru and 10 wt% WO3.
• The optimal operating temperature for the sensor was determined to be 200 degrees C.
• The sensor demonstrated effective detection of hydrogen sulfide gas.

Conclusions:

• The developed WO3/SnO2 thick-film sensor shows significant potential for H2S gas detection.
• Optimized doping and operating temperature are critical for achieving high sensor performance.
• This sensor can contribute to improved safety in industrial environments with potential H2S exposure.