Percolation-Driven NO2 Sensing in Structurally Tuned Sn/SnO Nanoparticles at Room Temperature with Parts-per-Billion Sensitivity

Monitoring air quality is crucial for understanding and improving public health. There is interest in developing ultra-sensitive, low-power, cost-effective sensors. This work demonstrates that structural modulation of Sn nanoparticles through controlled deposition and oxidation enables a transition from metallic to semiconducting percolative networks, significantly enhancing NO2 sensing performance at room temperature. The proposed percolation-driven sensing mechanism provides a new framework fo