High Performance and Reusable SAW Sensor Coated with Thiourea-Decorated POSS with Different Functional Groups for DMMP Detection

A colorless, odorless G nerve agent, a type of chemical transfer agent (CWA) that causes significant loss life, is being studied for quick and accurate detection. In this study, detection materials with different functional groups were synthesized based on thiourea (TU)-decorated polyhedral oligomeric silsesquioxane (POSS) to study the most suitable material dimethyl methylphosphonate (DMMP), simulant neural agents. The sensing was coated SAW sensor resonance frequency 250 MHz ST-quartz, DMMP exposure experiment conducted, performance compared through shift before after exposure. Coating excellent reactivity appropriate coating concentration each identified at 10 ppm. Among them, POSS-TU 3,5-bis(trifluoromethyl)phenyl as group showed largest characteristics, it used in low (1, 5, ppm) experiments confirm linear characteristics according concentration. Finally, selectivity other gases, confirmed amount gases except small, making an material.