文献类型：期刊文献

英文题名：Phosphonic Acid-Anchored Tungsten Oxide Nanowire with Boosted Activity and Stability for Ammonia Sensing

作者：Chen, Ke[1,2,3];Zhang, Guozhu[1,2,3];Gao, Rui[1,2,3];Shi, Jiangfei[1,2,3];Zhang, Chao[1,2,3];Wang, Zeyu[1,2,3];Qian, Kun[1,2,3];Nagashima, Kazuki[4,5];Gao, Yang[1,2,3];Xuan, Fu-Zhen[1,2,3]

机构：[1]Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]Hokkaido Univ, Grad Sch Chem Sci & Engn, N13W8 Kita, Sapporo, Hokkaido 0608628, Japan;[5]Hokkaido Univ, Res Inst Elect Sci, N21W10 Kita, Sapporo, Hokkaido 0010021, Japan

年份：2026

卷号：11

期号：2

起止页码：00

外文期刊名：ACS SENSORS

收录：;EI(收录号：20260920186671);WOS:【SCI-EXPANDED(收录号:WOS:001776685600001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos.: 52375148, 52321002, 52275146, 32327801, and 12411530109), the Sakura Science Exchange Program in Japan Science and Technology Agency (JST) (Grant No. S2024F0200227), Natural Science Foundation of Shanghai (Grant No. 23ZR1417000), and AI-Driven Reform of Research Paradigms to Empower Advancement of Disciplines, Opening Project of State Key Laboratory of Space-Power (Grant No. YF07050124F1266).

语种：英文

外文关键词：hexagonal tungsten oxide nanowires; methylphosphonic acid; surface functionalization; real-time ammonia monitoring

摘要：Highly active and stable sensing surfaces are critical for the integration of catalysis-based electrical gas molecular sensors. However, achieving both high sensitivity and durability remains a persistent challenge due to continuous exposure to target molecules often results in surface deactivation and sensing performance degradation. Herein, we demonstrate a robust surface functionalization strategy to simultaneously enhance sensitivity and long-term stability for ammonia (NH3) detection by modifying hexagonal tungsten oxide (h-WO3) nanowires with methylphosphonic acid (MPA). Fourier-transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations reveal that phosphate groups in MPA selectively bind to the Lewis acid sites (undercoordinated W6+) on h-WO3 nanowires, effectively passivating the surface and mitigating degradation. Concurrently, the electron-rich P=O moiety facilitates strong interaction with NH3 molecules, leading to enhanced chemisorption and signal transduction. As a result, MPA-functionalized h-WO3 nanowire sensors exhibit a nearly tenfold increase in NH3 sensitivity compared to the unmodified h-WO3 sensors and maintain stable performance over 300 days of continuous operation. As a proof of concept for applied scenarios, we integrate the modified sensors into a microelectromechanical system (MEMS)-based smart ventilation system, enabling real-time NH3 monitoring and control in livestock environments. This work presents a viable route for designing high-performance, durable gas sensors through targeted molecular surface engineering.