# KIMS team reports lead-free ammonia sensor with 1 ppm detection

_Wednesday, August 19, 2026 at 8:00 PM EDT · Science, Infrastructure · Latest · Tier 2 — Notable_

![KIMS team reports lead-free ammonia sensor with 1 ppm detection — Primary](https://scx2.b-cdn.net/gfx/news/2026/detecting-ammonia-leak.jpg)

A Korea Institute of Materials Science-led team reported a lead-free perovskite ammonia sensor that detected concentrations as low as 1 ppm. In tests at 100 ppm, the device responded in 13 seconds and its electrical signal rose as much as 235%. The researchers attribute the response to reversible ammonia intercalation that induces p-type doping, rather than only surface adsorption. The study was published in Small Structures and used antimony-based formamidinium antimony bromide as its sensing material.

## Sources

- [Phys.org - latest science and technology news stories](https://phys.org/news/2026-08-perovskite-based-sensor-ammonia-leaks.html)

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Retrieved: 2026-08-20T01:37:06.003Z
Publisher: Tech & Business (techandbusiness.org)