Phase transition and edge structure reconstruction of twodimensional(2D)materials are critical for modulating their properties and applications.Here,we employ a hydrogen-assisted annealing method to accomplish the ext...Phase transition and edge structure reconstruction of twodimensional(2D)materials are critical for modulating their properties and applications.Here,we employ a hydrogen-assisted annealing method to accomplish the extensive transformation from a 2H MoTe_(2)single crystal to Mo_(6)Te_(6)nanowires and quasi-2D Mo_(6)Te_(6)nanoribbons.Introducing hydrogen gas during atmospheric pressure annealing process generates a Te-poor chemical environment,which makes the transformations energetically favorable and is essential for the fast growth of Mo_(6)Te_(6)nanowires.Mo_(6)Te_(6)nanowires nucleate at the exposed edges of 2H MoTe_(2)and grow along its[1120],[2110],and[1210]crystallographic directions,demonstrating long-range order and forming quais-2D nanoribbons with lengths up to 50μm.Finally,nanoribbons align in sixfold oriented directions and form an array within 3 mm^(2)area on SiO_(2)/Si substrate.Mo_(6)Te_(6)nanowires display metallic behavior and have large charge transfer with Rhodamine 6G,making them excellent substrates for surface-enhanced Raman scattering.It shows a low detectable concentration of 10^(-13)mol/L for Rhodamine 6G and a Raman enhancement factor of 7×10^(8).Our findings provide an economic and efficient synthesis method for producing sixfold-oriented Mo_(6)Te_(6)nanowires and nanoribbons networks,which can serve as platform for exploring lowdimensional physical properties,designing electronic devices,and applications in analytical chemistry.展开更多
基金support from Research Groups of the National Natural Science Foundation of China(No.52121004)Hunan Key R&D Program Project(No.2022GK2005)+1 种基金the National Key R&D Program of the Ministry of Science and Technology of China(No.2022YFA1203801)the National Natural Science Foundation of China(Nos.51991340 and 51991343).
文摘Phase transition and edge structure reconstruction of twodimensional(2D)materials are critical for modulating their properties and applications.Here,we employ a hydrogen-assisted annealing method to accomplish the extensive transformation from a 2H MoTe_(2)single crystal to Mo_(6)Te_(6)nanowires and quasi-2D Mo_(6)Te_(6)nanoribbons.Introducing hydrogen gas during atmospheric pressure annealing process generates a Te-poor chemical environment,which makes the transformations energetically favorable and is essential for the fast growth of Mo_(6)Te_(6)nanowires.Mo_(6)Te_(6)nanowires nucleate at the exposed edges of 2H MoTe_(2)and grow along its[1120],[2110],and[1210]crystallographic directions,demonstrating long-range order and forming quais-2D nanoribbons with lengths up to 50μm.Finally,nanoribbons align in sixfold oriented directions and form an array within 3 mm^(2)area on SiO_(2)/Si substrate.Mo_(6)Te_(6)nanowires display metallic behavior and have large charge transfer with Rhodamine 6G,making them excellent substrates for surface-enhanced Raman scattering.It shows a low detectable concentration of 10^(-13)mol/L for Rhodamine 6G and a Raman enhancement factor of 7×10^(8).Our findings provide an economic and efficient synthesis method for producing sixfold-oriented Mo_(6)Te_(6)nanowires and nanoribbons networks,which can serve as platform for exploring lowdimensional physical properties,designing electronic devices,and applications in analytical chemistry.
