F- dopants blocking hydroxyl interference: A facile solution for realizing humidity-resistive, selectivity adjustable, highly sensitive In2O3-based gas sensors

作者：Zhidong Jin, Yue Mou, Jinbo Zhao, Fei Liu, Lin Liu, Jiurong Liu, Shiqiang Li, Fenglong Wang, Zhou Wang, Lili Wu · 发表于：Chemical Engineering Journal · 年份：2025 · DOI：10.1016/j.cej.2025.162338 · 被引用次数：20 · 研究领域：Gas Sensing Nanomaterials and Sensors、Advanced Chemical Sensor Technologies、Analytical Chemistry and Sensors

Water poisoning is regarded as long-term challenges for metal oxide semiconductor gas sensors (MOS), which leads to severe signal drifts and overall sensing performance inhibitions. To tackle this issue, we propose a novel In 2 O 3 -based sensing platform that incorporates humidity-blocking sites using F - ions for realizing highly humidity-resistive gas-sensing detections. This strategy offers a feasible and reliable means to inhibit humidity interference without compromising intrinsic capabilities of the sensor. Additionally, the robustness and adaptability of the anti-humidity effect of F - have been validated through the implementation of functional Ni atomic cluster decorations, allowing for humidity-resistive, sensitivity-enhanced, and tunable selectivity in gaseous marker monitoring. Supported by DFT calculations and spectroscopy analyses, we demonstrate that the enhanced moisture tolerance provided by F - arises from its high electronegativity, which inhibits chemisorbed oxygen reactivity with adsorbed water molecules and prevents hydroxyl radical formations under extreme humidity conditions. These advancements establish a universal solution for designing humidity tolerant gas sensors, paving the way for the development of accurate and robust sensing arrays capable of multiple analyte recognitions in variable moisture environments.