Tellurene,a chiral chain semiconductor with a narrow bandgap and exceptional strain sensitivity,emerges as a pivotal material for tailoring electronic and optoelectronic properties via strain engineering.This study el...Tellurene,a chiral chain semiconductor with a narrow bandgap and exceptional strain sensitivity,emerges as a pivotal material for tailoring electronic and optoelectronic properties via strain engineering.This study elucidates the fundamental mechanisms of ultrafast laser shock imprinting(LSI)in two-dimensional tellurium(Te),establishing a direct relationship between strain field orientation,mold topology,and anisotropic structural evolution.This is the first demonstration of ultrafast LSI on chiral chain Te unveiling orientation-sensitive dislocation networks.By applying controlled strain fields parallel or transverse to Te’s helical chains,we uncover two distinct deformation regimes.Strain aligned parallel to the chain’s direction induces gliding and rotation governed by weak interchain interactions,preserving covalent intrachain bonds and vibrational modes.In contrast,transverse strain drives shear-mediated multimodal deformations—tensile stretching,compression,and bending—resulting in significant lattice distortions and electronic property modulation.We discovered the critical role of mold topology on deformation:sharp-edged gratings generate localized shear forces surpassing those from homogeneous strain fields via smooth CD molds,triggering dislocation tangle formation,lattice reorientation,and inhomogeneous plastic deformation.Asymmetrical strain configurations enable localized structural transformations while retaining single-crystal integrity in adjacent regions—a balance essential for functional device integration.These insights position LSI as a precision tool for nanoscale strain engineering,capable of sculpting 2D material morphologies without compromising crystallinity.By bridging ultrafast mechanics with chiral chain material science,this work advances the design of strain-tunable devices for next-generation electronics and optoelectronics,while establishing a universal framework for manipulating anisotropic 2D systems under extreme strain rates.This work discovered crystallographic orientation-dependent deformation mechanisms in 2D Te,linking parallel strain to chain gliding and transverse strain to shear-driven multimodal distortion.It demonstrates mold geometry as a critical lever for strain localization and dislocation dynamics,with sharp-edged gratings enabling unprecedented control over lattice reorientation.Crucially,the identification of strain field conditions that reconcile severe plastic deformation with single-crystal retention offers a pathway to functional nanostructure fabrication,redefining LSI’s potential in ultrafast strain engineering of chiral chain materials.展开更多
The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant attention.However,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic sur...The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant attention.However,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their industrialization.To address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in air.Through precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)sensors.The profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and energyenhancement.When the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering signal.This enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)M.Notably,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of chemicals.Moreover,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS devices.Our study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy enhancement.The outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,photovoltaics,and clean water,propelling us closer to a sustainable and cleaner future.展开更多
The inspection of silicon carbide(SiC)wafer quality has attracted considerable attention because internal microstructure defects are challenging to detect in production lines.Expensive and destructive methods are usua...The inspection of silicon carbide(SiC)wafer quality has attracted considerable attention because internal microstructure defects are challenging to detect in production lines.Expensive and destructive methods are usually employed to detect dislocations and stacking faults inside SiC wafers.Fast optical methods to monitor internal defects are in demand.In this work,an ultrafast pulse laser was used to address this issue.The formation of surface nanostructures under the ultrafast laser processing of SiC wafers was explored systematically.This study discovered the origins of a typical surface nanostructure to the subsurface dislocation structure,called low-energy laser-induced nano straight lines(LLINSs),which forms under low-energy ultrafast pulse laser irradiation on a SiC wafer.The specific laser fluence ranges to form grooves,laser-induced periodic surface structures,LLINSs,and their hybrids were identified.The formation of LLINSs required an ultrafast laser(pulse width 280 fs)energy density less than 0.224 J/mm2,whereas that of pure LLINSs required a small range of 0.1–0.08 J/mm2 for SiC.LLINSs and their surrounding microstructures were observed using scanning transmission electron microscopy to identify their origin,which is related to the subsurface dislocation structure.Molecular dynamics analysis revealed that the subsurface defect area has a high energy level,which can facilitate amorphous transformation under the irradiation of an ultrafast laser,and the amorphous area had a tendency to evolve into LLINSs.Thus,subsurface lattice defects can be detected optically.This work opens new ways to detect the subsurface quality of semiconductor wafers in a green and sustainable manner.展开更多
Green production of functional nano-oxides on a large scale is crucial for the modern manufacturing industries.Traditional hydrothermal methods and ball milling are usually time-consuming and require long-term energy ...Green production of functional nano-oxides on a large scale is crucial for the modern manufacturing industries.Traditional hydrothermal methods and ball milling are usually time-consuming and require long-term energy input with undesired by-products.Herein,an ultrafast laser-induced high-pressure photochemistry manufacturing technique is developed to massively produce planar-aligned graphenecoated two-dimensional(2D)SnO_(2) nanoplatelet on carbon nanotube(CNT)paper under the green chemistry guidelines.The unique design of Z-axis confinement added to the ultrafast laser irradiation provides an exceptional high temperature of 1772 K and a high pressure of 24 GPa in the localized laser plasma plume.This transient nonequilibrium condition controls the formation of 2D SnO_(2),and the ablated C atoms cool down afterward as in-situ“glue”to intactly seal the oxides on the CNT substrate.The resultant hierarchical Graphene@2D SnO_(2)@CNT paper anode for Li-ion battery has an outstanding capacity of 819 mAh g^(−1)(1637 mAh cm^(−3))at 0.5 A g^(−1) and retains 622 mAh g^(−1)(1245 mAh cm^(−3))at 5.0 A g^(−1).The high capacity at 0.5 A g^(−1) has a retention of 92%after 600 cycles.This work provides an environmental-friendly scalable manufacturing technique to produce functional nanocomposites in 1 step.展开更多
基金financial support from NSF ExpandQISE program.The synthesis of tellurene was supported by NSF under grant no.CMMI-2046936supports from Purdue Research Foundation.
文摘Tellurene,a chiral chain semiconductor with a narrow bandgap and exceptional strain sensitivity,emerges as a pivotal material for tailoring electronic and optoelectronic properties via strain engineering.This study elucidates the fundamental mechanisms of ultrafast laser shock imprinting(LSI)in two-dimensional tellurium(Te),establishing a direct relationship between strain field orientation,mold topology,and anisotropic structural evolution.This is the first demonstration of ultrafast LSI on chiral chain Te unveiling orientation-sensitive dislocation networks.By applying controlled strain fields parallel or transverse to Te’s helical chains,we uncover two distinct deformation regimes.Strain aligned parallel to the chain’s direction induces gliding and rotation governed by weak interchain interactions,preserving covalent intrachain bonds and vibrational modes.In contrast,transverse strain drives shear-mediated multimodal deformations—tensile stretching,compression,and bending—resulting in significant lattice distortions and electronic property modulation.We discovered the critical role of mold topology on deformation:sharp-edged gratings generate localized shear forces surpassing those from homogeneous strain fields via smooth CD molds,triggering dislocation tangle formation,lattice reorientation,and inhomogeneous plastic deformation.Asymmetrical strain configurations enable localized structural transformations while retaining single-crystal integrity in adjacent regions—a balance essential for functional device integration.These insights position LSI as a precision tool for nanoscale strain engineering,capable of sculpting 2D material morphologies without compromising crystallinity.By bridging ultrafast mechanics with chiral chain material science,this work advances the design of strain-tunable devices for next-generation electronics and optoelectronics,while establishing a universal framework for manipulating anisotropic 2D systems under extreme strain rates.This work discovered crystallographic orientation-dependent deformation mechanisms in 2D Te,linking parallel strain to chain gliding and transverse strain to shear-driven multimodal distortion.It demonstrates mold geometry as a critical lever for strain localization and dislocation dynamics,with sharp-edged gratings enabling unprecedented control over lattice reorientation.Crucially,the identification of strain field conditions that reconcile severe plastic deformation with single-crystal retention offers a pathway to functional nanostructure fabrication,redefining LSI’s potential in ultrafast strain engineering of chiral chain materials.
基金the support by the Office of Naval Research’s NEPTUNE Program under the Grant Number N00014-16-1-3109the National Science Foundation CMMI NanoManufacturing Program。
文摘The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant attention.However,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their industrialization.To address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in air.Through precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)sensors.The profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and energyenhancement.When the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering signal.This enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)M.Notably,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of chemicals.Moreover,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS devices.Our study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy enhancement.The outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,photovoltaics,and clean water,propelling us closer to a sustainable and cleaner future.
基金financially supported by the National Key Research and Development Program of China(grant No.2018YFB1107701)。
文摘The inspection of silicon carbide(SiC)wafer quality has attracted considerable attention because internal microstructure defects are challenging to detect in production lines.Expensive and destructive methods are usually employed to detect dislocations and stacking faults inside SiC wafers.Fast optical methods to monitor internal defects are in demand.In this work,an ultrafast pulse laser was used to address this issue.The formation of surface nanostructures under the ultrafast laser processing of SiC wafers was explored systematically.This study discovered the origins of a typical surface nanostructure to the subsurface dislocation structure,called low-energy laser-induced nano straight lines(LLINSs),which forms under low-energy ultrafast pulse laser irradiation on a SiC wafer.The specific laser fluence ranges to form grooves,laser-induced periodic surface structures,LLINSs,and their hybrids were identified.The formation of LLINSs required an ultrafast laser(pulse width 280 fs)energy density less than 0.224 J/mm2,whereas that of pure LLINSs required a small range of 0.1–0.08 J/mm2 for SiC.LLINSs and their surrounding microstructures were observed using scanning transmission electron microscopy to identify their origin,which is related to the subsurface dislocation structure.Molecular dynamics analysis revealed that the subsurface defect area has a high energy level,which can facilitate amorphous transformation under the irradiation of an ultrafast laser,and the amorphous area had a tendency to evolve into LLINSs.Thus,subsurface lattice defects can be detected optically.This work opens new ways to detect the subsurface quality of semiconductor wafers in a green and sustainable manner.
基金G.J.C.thanks the financial assistance from the Office of Naval Research through NEPTUNE program.
文摘Green production of functional nano-oxides on a large scale is crucial for the modern manufacturing industries.Traditional hydrothermal methods and ball milling are usually time-consuming and require long-term energy input with undesired by-products.Herein,an ultrafast laser-induced high-pressure photochemistry manufacturing technique is developed to massively produce planar-aligned graphenecoated two-dimensional(2D)SnO_(2) nanoplatelet on carbon nanotube(CNT)paper under the green chemistry guidelines.The unique design of Z-axis confinement added to the ultrafast laser irradiation provides an exceptional high temperature of 1772 K and a high pressure of 24 GPa in the localized laser plasma plume.This transient nonequilibrium condition controls the formation of 2D SnO_(2),and the ablated C atoms cool down afterward as in-situ“glue”to intactly seal the oxides on the CNT substrate.The resultant hierarchical Graphene@2D SnO_(2)@CNT paper anode for Li-ion battery has an outstanding capacity of 819 mAh g^(−1)(1637 mAh cm^(−3))at 0.5 A g^(−1) and retains 622 mAh g^(−1)(1245 mAh cm^(−3))at 5.0 A g^(−1).The high capacity at 0.5 A g^(−1) has a retention of 92%after 600 cycles.This work provides an environmental-friendly scalable manufacturing technique to produce functional nanocomposites in 1 step.
