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Unveiling optical anisotropy in disrupted symmetry WSe_(2)/SiP heterostructures

Nano Research 2024年第9期17卷 8585-8591页

作者： Biqi Hu Xing Xie Xinyu Ouyang Junying Chen Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Yanping Liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have garnered considerable attention for their promising applications in sensors and optoelectronic devices,owing to their exceptional optical,electronic,and optoelectronic ***,the inherent high symmetry of TMD lattices imposes limitations on their functional ***,we present a strategy to disrupt the C_(3)rotational symmetry of monolayer WSe_(2)by fabricating a heterostructure incorporating WSe_(2)and SiP *** comprehensive experimental investigations and first-principle calculations,we elucidate that in the WSe_(2)/SiP heterostructure,excitons-both neutral and charged-emanating from WSe_(2)exhibit pronounced anisotropy,which remains robust against temperature ***,we observe an anisotropic ratio reaching up to 1.5,indicating a substantial degree of ***,we demonstrate the tunability of exciton anisotropy through the application of a magnetic field,resulting in a significant reduction in the anisotropic ratio with increasing field strength,from 1.57 to ***,the change in heterojunction anisotropy ratio reaches 24.8%as the magnetic field *** findings elucidate that the perturbation of the C_(3)rotational symmetry of the WSe_(2)monolayer arises from a non-uniform charge density distribution within the layer,exhibiting mirror *** results underscore the potential of heterostructure engineering in tailoring the properties of isotropic materials and provide a promising avenue for advancing the application of anisotropic devices across various fields.

关键词： symmetry breaking heterostructure engineering anisotropy optical spectroscopy

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1D/2D CoTe_(2)@MoS_(2)composites constructed by CoTe_(2)nanorods and MoS_(2)nanosheets for efficient electromagnetic wave absorption

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Nano Research 2023年第7期16卷 10698-10706页

作者： Naixin Zhai Juhua Luo Pengcheng Shu Jie Mei Xiaopeng Li Wenxing Yan School of Materials Science and engineering Yancheng Institute of TechnologyYancheng 224051China Jiangsu Provincial Key Laboratory of Eco-Environmental Materials Yancheng Institute of TechnologyYancheng 224051China

Rational design of the components and microstructure is regarded as an efficacious strategy for the high-performance electromagnetic wave absorbing(EMWA)***,the CoTe_(2)@MoS_(2)nanocomposites with CoTe_(2)nanorods and MoS_(2)nanosheets were synthesized via a hydrothermal *** microstructure and composition of the samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The CoTe_(2)@MoS_(2)composite was composed of stacked CoTe_(2)as the core and intertwined MoS_(2)nanosheets as the *** electromagnetic parameters of the CoTe_(2)@MoS_(2)composites were investigated by vector network analyzer(VNA).The EMWA property of the composite showed a trend of first increasing and then decreasing with the increasing content of MoS_(2).When the mass ratio of MoS_(2)and CoTe_(2)was 1:1,the CoTe_(2)@MoS_(2)composite exhibited the minimum reflection loss value of-68.10 dB at 4.71 GHz,and the effective absorption bandwidth value might reach 4.64 GHz(13.08-17.72 GHz)at a matching thickness of 1.60 mm with filler loading of 50 wt.%.The extraordinary EMWA property was attributed to the optimized impedance matching,multiple scattering and reflections,dipole polarization,conductive loss,and interfacial ***,the present approach to the design of microstructure and interface engineering offers a crucial way to construct high-performance EMW absorbers.

关键词： transition metal tellurides microstructure design heterostructure engineering electromagnetic wave absorption

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Advanced heterostructure of Pd nanosheets@Pt nanoparticles boosts methanol electrooxidation

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Journal of Energy Chemistry 2023年第10期85卷 430-438,I0012页

作者： Jie Li Cheng Wang Yuefan Zhang Shinichi Hata Kewang Zhang Changqing Ye Yukihide Shiraishi Yukou Du College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123JiangsuChina Jiangsu Key Laboratory for Environment Functional Materials School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009JiangsuChina Department of Applied Chemistry Faculty of EngineeringSanyo-Onoda City UniversitySanyo-OnodaYamaguchi 756-0884Japan School of Optical and Electronic Information Suzhou City UniversitySuzhou 215104JiangsuChina

heterostructures have emerged as elaborate structures to improve catalytic activity owing to their combined surface and distinct inverse ***,fabricating advanced nanocatalysts with facetdependent interface remains an unexploited and promising ***,we render the controlled growth of Pt nanoparticles(NPs)on Pd nanosheets(NSs)by regulating the reduction kinetics of Pt^(2+)with ***,the fast reduction kinetic makes the Pt NPs uniformly deposited on the Pd NSs(U-Pd@Pt HS),while the slow reduction kinetic leads to the preferential growth of Pt NPs on the edge of the Pd NSs(E-Pd@Pt HS).Density functional theory calculations demonstrate that Pd(111)-Pt interface in U-Pd@Pt HS induces the electron-deficient status of Pd substrates,triggering the d-band center downshift and amplifying the Pd-Pt intermetallic *** synergy between the electronic effect and interfacial effect facilitates the removal of poisonous intermediates on U-Pd@Pt *** virtue of the Pd NSs@Pt NPs interface,the heterostructure achieves exceptional methanol oxidation reaction activity as well as improved *** study innovatively proposes heterostructure engineering with facetdependent interfacial modulation,offering instructive guidelines for the rational design of versatile heterocatalysts.

关键词： heterostructure engineering Facet-dependent interfacial modulation Methanol oxidation reaction

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