Two-dimensional mesoporous materials combing ultrathin nanosheet morphology with well-defined mesoporous structures,are now emerging and becoming increasingly important for their promising applications in energy stora...Two-dimensional mesoporous materials combing ultrathin nanosheet morphology with well-defined mesoporous structures,are now emerging and becoming increasingly important for their promising applications in energy storage,electronic devices,electrocatalysts and so on.Here,we synthesized a kind of polypyrrole-based two-dimensional mesoporous materials with uniform pore size,ultrathin thickness and high surface area.Serving for electrochemical NH3 sensor,they exhibited a fast response and high sensitivity.Therefore,our study would promote much interest in design of new materials for gas sensor applications.展开更多
The external pressure is one of the essential parameters for regulating the structure and energy con-version properties of antiferroelectric AgNbO_(3).For pure AgNbO_(3),however,there has been still a blank of its rea...The external pressure is one of the essential parameters for regulating the structure and energy con-version properties of antiferroelectric AgNbO_(3).For pure AgNbO_(3),however,there has been still a blank of its real lattice structure under the stress field.Here,high-pressure lattice structures and phase transitions of AgNbO_(3)have been explored by spectroscopic experiments and theoretical models.A successive phase transition process from Pbcm to C222_(1) to P2_(1) has been observed at the pressure range of 0-30 GPa,associated with displacive-type characterized by soft-mode kinetics.Note that the paraelectric phase cannot be achieved under high-pressure at room temperature.Significantly,the competition of long-range Coulomb force,short-range interatomic interaction,and covalent interaction in AgNbO_(3)lattice were demonstrated under the stress field.The present work can provide fundamental guidelines to reveal the high-pressure phase transitions of AgNbO_(3),which will open up possibilities for the designing device with functional properties at extremes.展开更多
基金supported by the research programs from the National Natural Science Foundation of China(Nos.51773062 and 61831021)。
文摘Two-dimensional mesoporous materials combing ultrathin nanosheet morphology with well-defined mesoporous structures,are now emerging and becoming increasingly important for their promising applications in energy storage,electronic devices,electrocatalysts and so on.Here,we synthesized a kind of polypyrrole-based two-dimensional mesoporous materials with uniform pore size,ultrathin thickness and high surface area.Serving for electrochemical NH3 sensor,they exhibited a fast response and high sensitivity.Therefore,our study would promote much interest in design of new materials for gas sensor applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.62090013,61974043,12104156,62074058,61974044)the National Key Research and Development Program of China(Grants No.2019YFB2203403)+1 种基金Projects of Science and Technology Commission of Shanghai Municipality(Grant Nos.21JC1402100 and 23ZR1446400)Natural Science Foundation of Chongqing,China(CSTB2022NSCQ-MSX1367),the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning.
文摘The external pressure is one of the essential parameters for regulating the structure and energy con-version properties of antiferroelectric AgNbO_(3).For pure AgNbO_(3),however,there has been still a blank of its real lattice structure under the stress field.Here,high-pressure lattice structures and phase transitions of AgNbO_(3)have been explored by spectroscopic experiments and theoretical models.A successive phase transition process from Pbcm to C222_(1) to P2_(1) has been observed at the pressure range of 0-30 GPa,associated with displacive-type characterized by soft-mode kinetics.Note that the paraelectric phase cannot be achieved under high-pressure at room temperature.Significantly,the competition of long-range Coulomb force,short-range interatomic interaction,and covalent interaction in AgNbO_(3)lattice were demonstrated under the stress field.The present work can provide fundamental guidelines to reveal the high-pressure phase transitions of AgNbO_(3),which will open up possibilities for the designing device with functional properties at extremes.
