Two-dimensional(2D)transition metal oxides(TMOs)have attracted much attention for various applications,owing to the abundance of active sites,rapid ion transmission speed,and short carrier migration distance.However,t...Two-dimensional(2D)transition metal oxides(TMOs)have attracted much attention for various applications,owing to the abundance of active sites,rapid ion transmission speed,and short carrier migration distance.However,the current preparation strategies are usually limited to producing intrinsically layered compounds or sacrificing template.Here,we report a universal strategy for preparing ultrathin porous 2D TMO nanosheets by chemical topological transformation of the corresponding transition metal selenides.We observed that the as-prepared 2D TMO nanosheets not only perfectly inherit the transition metal selenides’2D topological structure,but also possess numerous pore structures formed as a way to release the structural stress associated with lattice growth.As a proof of concept,ultrathin porous WO_(3),Mo O_(3),and Co_(3)O_(4) nanosheets were successfully prepared based on the in-situ oxidation of the corresponding ultrathin WSe_(2),MoSe_(2),and Co_(0.85)Se,respectively.The outstanding sensing properties and photodetector performance displayed by the as-prepared porous 2D WO_(3) nanosheets further indicate the promising prospects of topology transformation for the preparation of porous 2D TMO nanosheets.展开更多
基金supported by the National Natural Science Foundation of China (61971204 and 51902114)
文摘Two-dimensional(2D)transition metal oxides(TMOs)have attracted much attention for various applications,owing to the abundance of active sites,rapid ion transmission speed,and short carrier migration distance.However,the current preparation strategies are usually limited to producing intrinsically layered compounds or sacrificing template.Here,we report a universal strategy for preparing ultrathin porous 2D TMO nanosheets by chemical topological transformation of the corresponding transition metal selenides.We observed that the as-prepared 2D TMO nanosheets not only perfectly inherit the transition metal selenides’2D topological structure,but also possess numerous pore structures formed as a way to release the structural stress associated with lattice growth.As a proof of concept,ultrathin porous WO_(3),Mo O_(3),and Co_(3)O_(4) nanosheets were successfully prepared based on the in-situ oxidation of the corresponding ultrathin WSe_(2),MoSe_(2),and Co_(0.85)Se,respectively.The outstanding sensing properties and photodetector performance displayed by the as-prepared porous 2D WO_(3) nanosheets further indicate the promising prospects of topology transformation for the preparation of porous 2D TMO nanosheets.
