Direct Observation of Electron-Vibration Coupling at MXene-Solvent Interface
MXene-溶剂界面处电子振动耦合的直接观察
MXene-溶媒界面での電子-振動カップリングの直接観察
MXene-용매 계면에서 전자-진동 커플링의 직접 관찰
Observación directa del acoplamiento electrón-vibración en la interfaz MXene-solvente
Observation directe du couplage électron-vibration à l'interface MXene-solvant
Прямое наблюдение электронно-вибрационной связи на границе раздела MXene-растворитель
¹ The Laboratory of Soft Matter Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
中国 北京 中国科学院物理研究所 北京凝聚态物理国家实验室 软物质物理实验室
² School of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学物理学院
³ Songshan Lake Materials Laboratory, Dongguan 523808, China
中国 东莞 松山湖材料实验室
Chinese Journal of Chemical Physics, 27 October 2021
Abstract
MXenes, a new family of two-dimensional (2D) materials, have received extensive interest due to their fascinating physicochemical properties, such as outstanding light-to-heat conversion efficiency. However, the photothermal conversion mechanism of MXenes is still poorly understood. Here, by using femtosecond visible and mid-infrared transient absorption spectroscopy, the electronic energy dissipation dynamics of MXene (Ti3C2Tx) nanosheets dispersed in various solvents are carefully studied.
Our results indicate that the lifetime of photoexcited MXene is strongly dependent on the surrounding environment. Especially, the interfacial electron-vibration coupling between the MXene nanosheets and the adjacent solvent molecules is directly observed following the ultrafast photoexcitation of MXene. It suggests that the interfacial interactions at the MXene-solvent interface play a critical role in the ultrafast energy transport dynamics of MXene, which offers a potentially feasible route for tailoring the light conversion properties of 2D systems.
