KRISS Scientists Develop Heat-Free LED Electronic Nose For Enhanced Multi-Gas Detection and Industrial Safety

KRISS develops a blue LED electronic nose for hazardous gas detection, eliminating the need for high-temperature heaters in industrial and wearable safety tech.

By: AXL Media

Published: Feb 25, 2026, 9:11 AM EST

Source: The information in this article was sourced from National Research Council of Science & Technology

Breakthrough in Room Temperature Molecular Sensing

Researchers at the Korea Research Institute of Standards and Science (KRISS) have successfully moved away from the energy-intensive heating elements traditionally required for gas detection. Conventional industrial sensors must maintain internal temperatures between 200°C and 400°C to facilitate chemical reactions with gas molecules, a process that leads to rapid hardware degradation and high electricity costs. The new system replaces these micro-heaters with cost-effective blue LEDs, allowing the equipment to operate efficiently at room temperature without the thermal stress that typically shortens the lifespan of safety monitoring hardware.

Harnessing Nanostructures for Photo-Generated Charge Concentration

The technical foundation of this advancement lies in a specialized Type-I heterojunction configuration developed by Dr. Kwon Ki Chang and his team. This structure features a thin coating of indium sulfide over an indium oxide base, creating what scientists describe as an energy well. According to the research findings, this configuration prevents charge carriers from dispersing, instead concentrating them at the reactive surface when exposed to blue light. This concentrated energy allows for immediate interaction with surrounding gas molecules, effectively bypassing the need for an external heat source to trigger the sensor's reactivity.

Mimicking Biological Olfaction Through Metallic Catalysts

To transform this light-driven reactivity into a functional electronic nose, the team integrated an array of sensors enhanced with various noble metal nanoparticles. By coating specific sections of the heterojunction with platinum, palladium, and gold, the researchers created a system capable of selective identification. Each metal catalyst is tuned to react to a specific chemical signature, enabling the device to distinguish between ammonia, ethanol, and hydrogen. This multi-sensor approach mimics the human sense of smell by analyzing complex patterns in mixed gas environments rather than relying on a single, binary trigger.