This technology features a hydrogen sulfide gas sensor and its manufacturing method, consisting of a substrate, electrodes, and a sensing layer made of aluminum-doped tin oxide nanomaterials. The sensing material is designed with a tin oxide-to-aluminum weight ratio of 1:0.16 to 1:0.33 and a particle size of 3 to 30 nm.
Hydrogen sulfide is generated during processes such as sulfuric acid production and the manufacturing of dyes and cosmetics. Even in trace amounts, it is highly toxic, corrosive, and explosive, and exposure to high concentrations can lead to unconsciousness and brain damage. However, existing gas sensors have limitations, as their detection performance degrades with humidity changes, making stable detection difficult in diverse environments.
This technology forms a sensing layer with a significantly increased specific surface area by depositing aluminum-doped tin oxide nanomaterials, obtained through hydrothermal synthesis and two-stage calcination, onto electrodes. This enables high-sensitivity detection that remains stable under various humidity conditions. It can be applied to hazardous gas monitoring in chemical and manufacturing plants and workplace safety alarm systems, ensuring worker safety without false alarms even in humid industrial settings.
This invention was developed with support from the KIURI Research Group for Extreme Property Materials and Ultra-High Value-Added Components, funded by the Ministry of Science and ICT.
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