Dual sulfur-specific pathways in ag-sensitized Cr2O3 Nanoarchitectures for robust H2S discrimination in complex gas mixtures

• Fabrication of Ag-sensitized Cr 2 O 3 nanoarchitectures via GLAD. • Maximum response of 107.2 to 10 ppm H 2 S, 7.2-fold higher than bare Cr 2 O 3 . • Robust H 2 S detection in 15 mixtures ( S > 100) with low cross-sensitivity ( S < 2.83). • Dual sulfur pathways: Ag x O-to-Ag x S conversion and Cr 2 O 3 surface sulfidation. • In-situ Raman and XPS confirm sulfur-driven pathways and HAL collapse.