Ambient Stable CsCu2I3 Flexible Gas Sensors for Reliable NO2 Detection at Room Temperature

• DOI: 10.1021/acs.nanolett.4c06149
• Publication Date: 2025-02-05T03:32:46Z
• Authors: Seung Ju Kim; Gi Baek Nam; Yeong Jae Kim; Tae Hoon Eom; Jung-El Ryu; Hyuk Jin Kim; Hyeon-Ji Lee; Ho Won Jang

The advancement of the Internet Things and artificial intelligence has increased demand for air quality monitoring to protect human health. Nitrogen dioxide (NO2), a hazardous pollutant, causes inflammatory responses, even at low concentrations, necessitating sensitive gas sensors. Although metal oxide semiconductor sensors are commonly used, their high-operating temperature reliance on additional heaters limit miniaturization increase power consumption. Here, lead-free, transparent, flexible CsCu2I3 halide perovskite sensor was developed, demonstrating high sensitivity (1509% 5 ppm) selectivity NO2 detection room with full recovery. exhibited stability in ambient high-humidity environments, which is not achievable traditional First-principles density functional theory calculations revealed mechanisms underlying its sensitivity. This study highlights potential perovskites low-power sensing temperature, addressing critical challenges commercially viable wearable applications.