The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis ...The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late timesfin the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.展开更多
The heterostructure of transition metal nanocrystal on two-dimensional(2D)materials exhibits unique physical and chemical properties through various interfacial interactions.It has been established that the atomic str...The heterostructure of transition metal nanocrystal on two-dimensional(2D)materials exhibits unique physical and chemical properties through various interfacial interactions.It has been established that the atomic structure and strain in the vicinity of the interface determine the band structure and phonon modes of the nanocrystal,regulating the optical and electrical properties of such heterostructures.Hence,metal–support interfacial engineering is a demonstrated approach to acquiring desired properties of the nanocrystals.However,a fundamental understanding of the interfacial structures remains elusive and precise control of the interactions has yet achieved.Herein,we explore the regulation of interface on MoS_(2)supported Pt nanocrystals which were prepared by reducing ultrasonic dispersed potassium chloroplatinate.The Pt-MoS_(2)heterostructure interface was systematically studied by aberration corrected transmission electron microscopy.Three types of Pt-MoS_(2)interfaces with distinct atomic configurations were identified.The strain within the Pt nanocrystals is sensitive to the atomic configuration of the supporting MoS_(2),which regulates the size of the Pt nanocrystals.These results provide insights on tuning of nanocrystal strain,paving the way for precise control of 2D semiconductor heterostructures.展开更多
基金This research was supported by the Chinese Foundation for Development of Geological Science and Technology (Project 49273162)the National Natural Science Foundation of China(Project 49273162)
文摘The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late timesfin the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.
基金the National Key Research and Development Program of China(No.2018YFA0703700)the National Natural Science Foundation of China(Nos.12034002,51971025,11974041,51901012,and 52071022)+1 种基金Natural Science Foundation of Beijing,China(No.2212034)the Fundamental Research Funds for the Central Universities(No.FRF-TP-18-075A1).
文摘The heterostructure of transition metal nanocrystal on two-dimensional(2D)materials exhibits unique physical and chemical properties through various interfacial interactions.It has been established that the atomic structure and strain in the vicinity of the interface determine the band structure and phonon modes of the nanocrystal,regulating the optical and electrical properties of such heterostructures.Hence,metal–support interfacial engineering is a demonstrated approach to acquiring desired properties of the nanocrystals.However,a fundamental understanding of the interfacial structures remains elusive and precise control of the interactions has yet achieved.Herein,we explore the regulation of interface on MoS_(2)supported Pt nanocrystals which were prepared by reducing ultrasonic dispersed potassium chloroplatinate.The Pt-MoS_(2)heterostructure interface was systematically studied by aberration corrected transmission electron microscopy.Three types of Pt-MoS_(2)interfaces with distinct atomic configurations were identified.The strain within the Pt nanocrystals is sensitive to the atomic configuration of the supporting MoS_(2),which regulates the size of the Pt nanocrystals.These results provide insights on tuning of nanocrystal strain,paving the way for precise control of 2D semiconductor heterostructures.
