文献类型：期刊文献

英文题名：Physicochemical regulations of nanoconfined two-dimensional spacing toward highly-selective NH3 sensing

作者：Chu, Tianshu[1,2,3];Mao, Xinyuan[1,2,3];Li, Linfeng[1,2,3];Wang, Tao[1,2,3];Wang, Xiaoyuan[1,2,3,4];Zhang, Bowei[1,2,3,4];Xuan, Fu-Zhen[1,2,3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, CPCIF Key Lab Power Battery Syst & Safety, Shanghai 200237, Peoples R China

年份：2026

卷号：19

期号：1

外文期刊名：NANO RESEARCH

收录：;EI(收录号：20260520005525);WOS:【SCI-EXPANDED(收录号:WOS:001652139000044)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52422505 and 12274124) and the Innovative Research Group Project of the National Natural Science Foundation of China (No. 52321002) . Thank Dr. Yanyan Jia and Prof. Sheng Dai at the Feringa Nobel Prize Scientist Joint Research Center of East China University of Science and Technology for the support on TEM characterization.

语种：英文

外文关键词：two-dimensional (2D) materials; physicochemical regulation; ion intercalation; gas sensing; nanoconfined space

摘要：Nanoscale confinement environments often affect the transport mechanisms of nanofluids. Understanding the dynamic behavior of molecules in two-dimensional (2D) confined channels is of great importance in the areas of sensing, catalysis and energy storage. As a popular candidate for a new type of gas sensing material, MXenes have the problem of nonselectivity towards polar gases with slow responses, which severely limits their applications. Here, we report a study on regulating the confinement effect of 2D channels between MXene layers through annealing treatment and ion (Na+) intercalation for high-performance ammonia (NH3) sensing. Firstly, the annealing treatment accurately modulates the size of the 2D channels to effectively block the entry of large-size gas molecules and improve the selectivity for NH3. Ab initiomolecular dynamics (AIMD) also confirms that the modulated channel size has a special "nano-pumping effect", which can accelerate the dynamic behavior of NH3 molecules in the 2D confined space. Moreover, the intercalation of Na+ions increases the adsorption capacity of NH3. Therefore, the "nano-pumping effect" and theintercalation of Na+ ions effectively enhance the response speed and sensitivity of MXene to NH3, respectively. The experimental results show that the modified Ti3C2 exhibits high sensitivity (0.17), rapid response (181 s), excellent selectivity and stability towards NH3.