通过亚胺自由基引发的1,5-氢原子转移(Hydrogen Atom Transfer,HAT)途径实现C(sp^(3))—H键官能团化,可避免导向基团和当量氧化剂的使用,因而引起了研究人员的广泛关注。近年来,过渡金属和可见光氧化还原体系的发展为高效可控产生亚胺...通过亚胺自由基引发的1,5-氢原子转移(Hydrogen Atom Transfer,HAT)途径实现C(sp^(3))—H键官能团化,可避免导向基团和当量氧化剂的使用,因而引起了研究人员的广泛关注。近年来,过渡金属和可见光氧化还原体系的发展为高效可控产生亚胺自由基提供了可靠的方法。本文根据亚胺自由基的来源分类总结了亚胺自由基引发的1,5-氢原子转移实现C(sp^(3))—H键官能团化反应。展开更多
The microscopic process of oxidative etching of two-dimensional molybdenum disulfide(2D MoS_2) at an atomic scale is investigated using a correlative transmission electron microscope(TEM)-etching study.MoS_2 flakes on...The microscopic process of oxidative etching of two-dimensional molybdenum disulfide(2D MoS_2) at an atomic scale is investigated using a correlative transmission electron microscope(TEM)-etching study.MoS_2 flakes on graphene TEM grids are precisely tracked and characterized by TEM before and after the oxidative etching. This allows us to determine the structural change with an atomic resolution on the edges of the domains, of well-oriented triangular pits and along the grain boundaries. We observe that the etching mostly starts from the open edges, grain boundaries and pre-existing atomic defects.A zigzag Mo edge is assigned as the dominant termination of the triangular pits, and profound terraces and grooves are observed on the etched edges. Based on the statistical TEM analysis, we reveal possible routes for the kinetics of the oxidative etching in 2D MoS_2, which should also be applicable for other 2D transition metal dichalcogenide materials like MoSe_2 and WS_2.展开更多
基金the National Natural Science Foundation of China(No.11574223)the Natural Science Foundation of Jiangsu Province(BK20150303)the Six Talent Peaks Project of Jiangsu Province(2019-XCL-081)。
基金funding of this work by the National Science Foundation,Division of Chemical,Bioengineering,Environmental and Transport Systems(CBET)through Award#1800507 and 1510435。
基金supported by the National Natural Science Foundation of China(21173210,21225315)the National Basic Research Program of China(973 Program,2013CB834603)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA09030000)~~
基金the National Natural Science Foundation of China(21590792,91426302,and 21433005)Guangdong Provincial Key Laboratory of Catalysis(2020B121201002)+1 种基金the National Science Basic Research Program of Shaanxi Province(2019JM-226)the financial and technical support from the Research Center for Advanced Materials Science(RCAMS)at King Khalid University through the Grant(RCAMS/KKU/014-20)。
文摘通过亚胺自由基引发的1,5-氢原子转移(Hydrogen Atom Transfer,HAT)途径实现C(sp^(3))—H键官能团化,可避免导向基团和当量氧化剂的使用,因而引起了研究人员的广泛关注。近年来,过渡金属和可见光氧化还原体系的发展为高效可控产生亚胺自由基提供了可靠的方法。本文根据亚胺自由基的来源分类总结了亚胺自由基引发的1,5-氢原子转移实现C(sp^(3))—H键官能团化反应。
基金the financial support from the National Key R&D Program of China(2018YFA0208504)the National Natural Science Foundation of China(21573244 and21573245)the Youth Innovation Promotion Association of CAS(2017049)
基金supported by the National Basic Research Program of China(2014CB932500,2015CB921004)the National Natural Science Foundation of China(51472215,51222202,61571197 and 61172011)the 111 project(B16042)
文摘The microscopic process of oxidative etching of two-dimensional molybdenum disulfide(2D MoS_2) at an atomic scale is investigated using a correlative transmission electron microscope(TEM)-etching study.MoS_2 flakes on graphene TEM grids are precisely tracked and characterized by TEM before and after the oxidative etching. This allows us to determine the structural change with an atomic resolution on the edges of the domains, of well-oriented triangular pits and along the grain boundaries. We observe that the etching mostly starts from the open edges, grain boundaries and pre-existing atomic defects.A zigzag Mo edge is assigned as the dominant termination of the triangular pits, and profound terraces and grooves are observed on the etched edges. Based on the statistical TEM analysis, we reveal possible routes for the kinetics of the oxidative etching in 2D MoS_2, which should also be applicable for other 2D transition metal dichalcogenide materials like MoSe_2 and WS_2.
