Engineering Function-Reversal Sacrificial Sites for Selective Volatile Aromatic Hydrocarbons Detection in Complex Environments.

Abstract

Accurately monitoring carcinogenic volatile aromatic hydrocarbons (BTXs) is crucial for assessing air-qualities and danger-classes in specific occasions, However, it remains challenging to conduct highly selective identification of them in complex environments. Here, we have developed a gas-shunting strategy by installing function-reversal ZnO materials into Ir-WO₃ supports to diminish interference-gas responses and guide special aromatic hydrocarbons sensing. We find that ZnO materials can serve as reactively sacrificial sites for small-molecule H₂S and CO and induce main aromatic hydrocarbons reactants into Ir-WO₃ supports. This gas-shunting route guarantees highly-selective aromatic hydrocarbons sensing even in dual/ternary gas mixtures. Through integrating functional-opposite sensors into a system, the final sensing arrays achieve 100% classification accuracy for 10 single gases and 75 multi-compose gases with low training costs. In addition, we also show an autonomic "cruise-detection" system by equipping sensor arrays into robotic dog to accurately identify complex gases. Our findings emphasize sensors designs with selective features and may broaden integrated sensing-system analysis in complex environment.