2D materials including graphene and TMDs have proven interesting physical properties and promising optoelectronic applications.We reviewed the growth,characterization and optoelectronics based on 2D TMDs and their het...2D materials including graphene and TMDs have proven interesting physical properties and promising optoelectronic applications.We reviewed the growth,characterization and optoelectronics based on 2D TMDs and their heterostructures,and demonstrated their unique and high quality of performances.For example,we observed the large mobility,fast response and high photo-responsivity in Mo S;,WS;and WSe;phototransistors,as well as the novel performances in vd W heterostructures such as the strong interlayer coupling,am-bipolar and rectifying behaviour,and the obvious photovoltaic effect.It is being possible that 2D family materials could play an increasingly important role in the future nano- and opto-electronics,more even than traditional semiconductors such as silicon.展开更多
Two-dimensional semiconductors such as transition metal dichalcogenides(TMDs)have attracted much interest in the past decade.Herein,we present an all-physical top-down method for the scalable production of the intrins...Two-dimensional semiconductors such as transition metal dichalcogenides(TMDs)have attracted much interest in the past decade.Herein,we present an all-physical top-down method for the scalable production of the intrinsic TMD quantum sheets(QSs).The phases of the TMDs(e.g.,2H-MoSe_(2),2H-WSe_(2),and Td-WTe2)remain stable during the transformation from bulk to QSs.However,phase transition(from Td to 2H)is detected in MoTe2.Such phase-modulation by size-reduction has never been reported before.The TMD QSs can be well dispersed in solvents,resulting in remarkable photoluminescence with excitation wavelength-,concentration-,and solvent-dependence.Meanwhile,the TMD QSs can be readily solution-processed into hybrid thin films,which demonstrate exceptional nonlinear saturation absorption(NSA).Notably,2H-MoTe2 QSs in poly(methyl methacrylate)show extremely high NSA performance with(absolute)modulation depth up to 46.6%and saturation intensity down to 0.81 MW·cm^(−2).Our work paves the way towards quantum-sized TMDs.展开更多
为了对半潜式风机水平向和竖向的振动进行控制,提出了多向多点位调谐质量阻尼器(tuned mass damper,TMD)的布设方式,即在机舱内布置H-TMD,平台内布置V-TMD。为研究这种TMD布设方式的减振效果,建立了半潜式风机-多向多点位TMD全耦合数值...为了对半潜式风机水平向和竖向的振动进行控制,提出了多向多点位调谐质量阻尼器(tuned mass damper,TMD)的布设方式,即在机舱内布置H-TMD,平台内布置V-TMD。为研究这种TMD布设方式的减振效果,建立了半潜式风机-多向多点位TMD全耦合数值模型,利用OpenFAST仿真分析风浪联合作用下半潜式风机的动力响应。结果表明:布置多向多点位TMD的减振效果要比单点位TMD的减振效果要好,且在机舱内布置低频H-TMD,平台内布置V-TMD为最优布置方案,能够使半潜式风机纵摇、横摇、垂荡、塔架纵向振动的平均标准差控制率分别达到13.97%、32.85%、15.21%、2.86%。展开更多
文摘2D materials including graphene and TMDs have proven interesting physical properties and promising optoelectronic applications.We reviewed the growth,characterization and optoelectronics based on 2D TMDs and their heterostructures,and demonstrated their unique and high quality of performances.For example,we observed the large mobility,fast response and high photo-responsivity in Mo S;,WS;and WSe;phototransistors,as well as the novel performances in vd W heterostructures such as the strong interlayer coupling,am-bipolar and rectifying behaviour,and the obvious photovoltaic effect.It is being possible that 2D family materials could play an increasingly important role in the future nano- and opto-electronics,more even than traditional semiconductors such as silicon.
基金supported by the National Natural Science Foundation of China(Nos.52073070,21673054,11874130,and 22073022)the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB36000000)+1 种基金the National Key R&D Program of China(No.2018YFA0703700)the DNL Cooperation Fund CAS(No.DNL202016).
文摘Two-dimensional semiconductors such as transition metal dichalcogenides(TMDs)have attracted much interest in the past decade.Herein,we present an all-physical top-down method for the scalable production of the intrinsic TMD quantum sheets(QSs).The phases of the TMDs(e.g.,2H-MoSe_(2),2H-WSe_(2),and Td-WTe2)remain stable during the transformation from bulk to QSs.However,phase transition(from Td to 2H)is detected in MoTe2.Such phase-modulation by size-reduction has never been reported before.The TMD QSs can be well dispersed in solvents,resulting in remarkable photoluminescence with excitation wavelength-,concentration-,and solvent-dependence.Meanwhile,the TMD QSs can be readily solution-processed into hybrid thin films,which demonstrate exceptional nonlinear saturation absorption(NSA).Notably,2H-MoTe2 QSs in poly(methyl methacrylate)show extremely high NSA performance with(absolute)modulation depth up to 46.6%and saturation intensity down to 0.81 MW·cm^(−2).Our work paves the way towards quantum-sized TMDs.
文摘为了对半潜式风机水平向和竖向的振动进行控制,提出了多向多点位调谐质量阻尼器(tuned mass damper,TMD)的布设方式,即在机舱内布置H-TMD,平台内布置V-TMD。为研究这种TMD布设方式的减振效果,建立了半潜式风机-多向多点位TMD全耦合数值模型,利用OpenFAST仿真分析风浪联合作用下半潜式风机的动力响应。结果表明:布置多向多点位TMD的减振效果要比单点位TMD的减振效果要好,且在机舱内布置低频H-TMD,平台内布置V-TMD为最优布置方案,能够使半潜式风机纵摇、横摇、垂荡、塔架纵向振动的平均标准差控制率分别达到13.97%、32.85%、15.21%、2.86%。
