Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investiga...Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investigations mainly focus on sorption behaviors mediated by external temperature variations.Here,we demonstrate a route to in situ sensitive detection of laser irradiation-induced localized water molecule desorption at a sub-monolayer level on an oxide surface.Harnessing a tailored set of optical whispering-gallery-mode(WGM)resonances in a nanomembrane-based microtube cavity,the desorption can be tracked by resonance mode shift in real-time,and further explained using a combination of pseudo-firstorder and pseudo-second-order models.Additionally,upon adjusted laser excitation locations,the axial-mode-dependent responses enable the retrieval of corresponding profiles of desorption-induced perturbation at equilibrium.This study provides new insights into molecular desorption kinetics and introduces a spatially resolved sensing technique with applications in surface science,molecular sensing,and the study of desorption dynamics at the nanoscale.展开更多
基金the support from the National Key R&D Program of China under Grant 2023YFE0208700the National Natural Science Foundation of China under Grants 62422503,12474375,12274182,and 62305093+2 种基金Science and Technology Innovation Commission of Shenzhen under Grants JCYJ20220531095604009,JCYJ20240813104819027,RCYX20221008092907027,and GXWD20231129101105001Hainan Province"Nanhai New Star"Science and Technology Innovation Talent Platform Program under Grant NHXXRCXM202304the Innovation/Entrepreneurship Program of Jiangsu Province under Grants JSSCTD202146 and JSSCRC2021538.
文摘Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investigations mainly focus on sorption behaviors mediated by external temperature variations.Here,we demonstrate a route to in situ sensitive detection of laser irradiation-induced localized water molecule desorption at a sub-monolayer level on an oxide surface.Harnessing a tailored set of optical whispering-gallery-mode(WGM)resonances in a nanomembrane-based microtube cavity,the desorption can be tracked by resonance mode shift in real-time,and further explained using a combination of pseudo-firstorder and pseudo-second-order models.Additionally,upon adjusted laser excitation locations,the axial-mode-dependent responses enable the retrieval of corresponding profiles of desorption-induced perturbation at equilibrium.This study provides new insights into molecular desorption kinetics and introduces a spatially resolved sensing technique with applications in surface science,molecular sensing,and the study of desorption dynamics at the nanoscale.
