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A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

Light(science & Applications) 2022年第3期11卷 76-85页

作者： Tongyao Zhang Hanwen Wang Xiuxin Xia Ning Yan Xuanzhe Sha Jinqiang Huang Kenji Watanabe Takashi Taniguchi Mengjian Zhu Lei Wang Jiantou Gao Xilong Liang Chengbing Qin Liantuan Xiao Dongming Sun Jing Zhang Zheng Han Xiaoxi Li State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaAnhui 230026China Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China The Key Laboratory of Science and Technology on Silicon Devices Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China The University of Chinese Academy of Sciences Beijing 100029China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China

The nano-opto-electro-mechanical systems(NOEMS)are a class of hybrid solid devices that hold promises in both classical and quantum manipulations of the interplay between one or more degrees of freedom in optical,electrical and mechanical *** date,studies of NOEMS using van der Waals(vdW)heterostructures are very limited,although vdW materials are known for emerging phenomena such as spin,valley,and topological ***,we devise a universal method to easily and robustly fabricate vdW heterostructures into an architecture that hosts opto-electro-mechanical couplings in one single *** demonstrated several functionalities,including nano-mechanical resonator,vacuum channel diodes,and ultrafast thermo-radiator,using monolithically sculpted graphene NOEMS as a *** readout of electric and magnetic field tuning of mechanical resonance in a CrOCl/graphene vdW NOEMS is further *** results suggest that the introduction of the vdW heterostructure into the NOEMS family will be of particular potential for the development of novel lab-on-a-chip systems.

关键词： monolithic tuning resonator

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三合一设计策略促进超细PtNiW@WOx核壳纳米线氢氧化电催化剂的CO耐受性

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science China materials 2024年第6期67卷 1866-1875页

作者：刘巍杨馥榕孙土来黄晨明赖文川杜佳峰叶进裕曾昱嘉高磊黄宏文 College of Materials Science and Engineering Hunan UniversityChangsha 410082China Center for Electron Microscopy State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China College of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsDepartment of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Research Institute of Hunan University Shenzhen 518055China

铂(Pt)是质子交换膜燃料电池(PEMFCs)阳极氢氧化反应(HOR)中最先进的电催化剂.然而,Pt催化剂对CO(工业低成本氢燃料中的杂质)极度敏感从而中毒,这会引起器件性能的急剧衰退,导致器件运行成本高.因此,提高Pt催化剂的CO耐受性对PEMFCs的... 详细信息

铂(Pt)是质子交换膜燃料电池(PEMFCs)阳极氢氧化反应(HOR)中最先进的电催化剂.然而,Pt催化剂对CO(工业低成本氢燃料中的杂质)极度敏感从而中毒,这会引起器件性能的急剧衰退,导致器件运行成本高.因此,提高Pt催化剂的CO耐受性对PEMFCs的商业化推广至关重要.在此,我们设计合成了一种独特的PtNiW@WO_(x)核壳纳米线来提高Pt基催化剂对CO的耐受能力.机理研究表明,表面无定形的WO_(x)壳层可以作为分子围栏,在动力学上阻碍CO扩散到达Pt位点.在热力学上,Ni和W元素合金化产生的电子效应可以使Pt的d带中心降低,减弱CO在Pt位点上的化学吸附.此外,亲氧W元素可以加速水的解离,提供更多OH活性物种,促进CO的氧化脱附.因此,在1000ppm CO/H_(2)条件下,所设计的PtNiW@WO_(x)核壳纳米线催化剂表现出优异的HOR抗CO中毒性能,在4000 s后仍能保持超过90%的HOR电流密度,超过了原始的PtNi纳米线和目前报道的绝大多数Pt基催化剂.

关键词： hydrogen oxidation reaction Pt-based electrocatalyst CO tolerant fuel cell catalyst design

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Dynamics of asymmetrically deformed skyrmion driven by internal forces and strain force in a flower-shaped magnetic nanostructure

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Physical Review B 2024年第22期110卷 224411-224411页

作者： Zhen-Yu Tan Ji-Pei Chen Yu-Ke Shi Yuan Chen Ming-Hui Qin Xing-Sen Gao Jun-Ming Liu School of Physics and Materials Science and Research Center for Advanced Information Materials Guangzhou University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and Institute for Advanced Materials South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Magnetic skyrmions emerge as promising quasiparticles for encoding information in next-generation spintronic devices. Their innate flexibility in shape is essential for the applications although they were often ideally treated as rigid particles. In this work, we investigated the voltage-controlled uniform strain mediated dynamics of deformed skyrmions in heterostructures with a flower-shaped magnetic nanostructure, using micromagnetic simulations. The simulated results revealed the possible states of isolated skyrmion nucleated in the nanostructure, which can be mutually switched by applying suitable in-plane strain pulses. In addition, it was found that the skyrmion motions are driven by the emerging internal forces and strain force, which originate from the asymmetric deformation of skyrmion structures. Furthermore, an analytical model of deformed skyrmions was proposed to interpret the dependences of internal forces and strain force on the asymmetric deformation of skyrmion, with some formulas derived for these forces in a semianalytical approach. Further calculations based on these formulas verified the forces appearing in the skyrmion motion, with the resulting forces showing consistence with the simulated data. This suggested that our semianalytical model successfully captures the main physics responsible for the motion of deformed skyrmion in the nanostructure. Our work extends the understanding of the mechanics emerging in deformed skyrmion and provides an effective approach for deterministic manipulation of deformed skyrmion motion via strain forces and internal forces, which may be instructive to the design of skyrmion-based spintronic devices.

关键词： Magnetic anisotropy Magnetic interactions Magnetic texture Magnetization dynamics Methods in magnetism Micromagnetism

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Hydroxyl radical induced from hydrogen peroxide by cobalt manganese oxides for ciprofloxacin degradation

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Chinese Chemical Letters 2022年第12期33卷 5208-5212页

作者： Shuandi Wang Xiaodong Zhang Guozhu Chen Bao Liu Hongmei Li Junhua Hu Junwei Fu Min Liu Hunan Joint International Research Center for Carbon Dioxide Resource Utilization School of Physics and ElectronicsState Key Laboratory of Powder MetallurgyHunan Provincial Key Laboratory of Chemical Power SourcesCentral South UniversityChangsha 410083China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

Advanced oxidation processes(AOPs)are promising technology to remove organic pollutant in ***,the main problem in the AOPs is the low generation of hydroxyl radical(·OH)owing to the low decomposition efficiency of hydrogen peroxide(H_(2)O_(2)).Herein,the spinel type cobalt acid manganese(MnCo_(2)O_(4))with flower morphology was fabricated through a co-precipitation *** situ Fourier transform infrared spectroscopy confirms that the MnCo_(2)O_(4) with the optimal molar ratio of Co and Mn precursors(CM3,Co:Mn=3)has more Lewis acid sites compared with single metal oxide catalysts(Co_(3)O_(4) and Mn_(2)O_(3)),leading to the excellent performances for H_(2)O_(2) decomposition rate constant on CM3,which is about 15.03 and 4.21 times higher than those of Co_(3)O_(4) and Mn_(2)O_(3),*** a result,the obtained CM3 shows a higher ciprofloxacin degradation ratio than that of Co_(3)O_(4) and Mn_(2)O_(3).Furthermore,CM3 shows an excellent stability during several *** work proposes effective catalysts for ciprofloxacin decomposition and provides feasible route for treating practical environmental problems.

关键词： Catalytic decomposition Hydrogen peroxide Advanced oxidation processes Ciprofloxacin Pollutant degradation

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Boosting Covalent Organic Framework Luminescence by Suppressing Nonradiative Pathways

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Chinese Journal of Chemistry 2025年第6期43卷 633-640页

作者： Minghao Liu Yuan-Zhe Cheng Yubin Fu Shuai Bi Xuesong Ding Bao-Hang Han Qing Xu Gaofeng Zeng CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210 China Department of Chemistry Laboratory of Advanced MaterialsState Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai200433 China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China Center for Advancing Electronics Dresden(CFAED)and Faculty of Chemistry and Food Chemistry Technische Universität Dresden01062 DresdenGermany Max Planck Institute of Microstructure Physics Weinberg 206120 HalleGermany Department of Chemistry City University of Hong KongKowloonHong KongChina

Comprehensive Summary The construction of luminescent two-dimensional(2D)imine-linked covalent organic frameworks(COFs)is a formidable challenge due to the strong interlayer stacking and bond rotations that typically suppress intramolecular charge transfer(ICT),leading to nonradiative energy ***,three COFs with tailored interlayer distances and bond rotations are designed to modulate the ICT *** targeted COF(TPAZ-TPE-COF)achieved a significantly enhanced photoluminescence quantum yield(PLQY)of 21.22%in the solid state by restricting bond rotation and enlarging the layer *** represents a 3.5-fold and 530.5-fold improvement over TPAZ-PYTA-COF(6.15%),which has a shortened interlayer space,and TPAZ-PATA-COF(0.04%),which exhibits strong bond rotations,***,TPAZ-TPE-COF also exhibits exceptional sensing performance for iron ions,with a detection limit at the ppb *** experimental and theoretical analyses reveal that the prominent luminescent performance of TPAZ-TPE-COF is assigned to the effective suppression of nonradiative pathways,especially those arising from interlayer stacking and bond *** findings pave the way for deliberate construction of imine-linked 2D COFs with high PL intensity,thereby expanding the portfolio of luminescent COFs with potential applications in sensing and optoelectronics.

关键词： Covalent organic frameworks Photoluminescence Intramolecular charge transfer Nonradiative pathways Light-emitting diodes Porous polymers Sensors Molecular recognition

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High-performance visible-infrared broadband transparent copper mesh conductor and applications for electromagnetic shielding and heating

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science China materials 2025年第2期68卷 421-431页

作者： Tengfei Li Xiaolian Chen Zhaohua Xu Shuhong Nie Wenya Xu Wei Yuan Su Xu Shuo Zhang Fangfang Pei Wenming Su Zheng Cui School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Printable Electronics Research Center Nano-Devices and Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Transparent conductors(TCs)have widespread applications in the fields of modern photodetectors and smart *** TCs for visible wavelengths have seen significant advancements,the development of visible-infrared(vis-IR)broadband TCs for infrared is still a daunting challenge due to the trade-off between infrared transparency and ***,we present a vis-IR TC fabricated by using a damage-free indirect transfer *** method involves polymer-mediated bonding of a high-resolution,standalone copper(Cu)mesh onto infrared or visible substrates via a transfer *** obtained Cu mesh TC exhibits excellent conductivity with a sheet resistance as low as 0.06Ω/□,as well as 81%transmittance at a visible wavelength of 550 nm and 65%transmittance at an IR wavelength of 10μ***,a specially developed bonding strategy ensures the longterm reliability of the Cu mesh TC in harsh *** Cu mesh TC can be applied in both heating and electromagnetic(EM)*** a transparent heater,it reaches approximately 100℃ at an applied voltage of 1.2 V within 100 *** EM shielding,a demonstration using a stainlesssteel box with a transparent observation window which is integrated with the Cu mesh shows that while the window allows both optical and IR observations,the 4G signals(8.2 GHz)of a smartphone inside the box are effectively blocked.

关键词： infrared visible transparent conductors electromagnetic shielding Cu mesh

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Alternative photothermal/electrothermal hierarchical membrane for hypersaline water treatment

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SusMat 2022年第6期2卷 679-688页

作者： Miao Wang Wen He Yuhui Hua Xinwen Xie Shiyan Chen Lei Zhou Yunmao Zhang Yaqi Hou Shihong Lin Haiping Xia Jing Zheng Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina College of Materials Xiamen UniversityXiamenChina Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen UniversityXiamenChina Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Catalysis Department of ChemistrySouthern University of Science and TechnologyShenzhenChina Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Xiamen UniversityXiamenChina Department of Civil and Environmental Engineering Vanderbilt UniversityNashvilleTennesseeUSA Interdisciplinary Material Science Program Vanderbilt UniversityNashvilleTennesseeUSA Tan Kah Kee Innovation Laboratory Xiamen UniversityXiamenChina Engineering Research Center of Electrochemical Technologies of Ministry of Education Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina

Over the last decades,the treatment of the large quantities of hypersaline wastewater generated by conventional industries,inland desalination,and fossil-fueled power plants has been an important economic issue and also an inescapable green ***,we developed a versatile interfacial heating membrane with alternating utilization of electricity or solar energy for hypersaline water *** hierarchical membrane functions both as a separation membrane and an interface heater,which can quickly(<0.1 s)convert electricity or solar energy into heat to evaporate the outermost layer of hypersaline *** 10wt% hyper-saline water,the freshwater production rate can reach 16.8kg/m^(2)⋅h by applying a voltage of 10 V and 1.36 kg/m^(2)⋅h under 1-sun ***,it exhibits high electrochemical resistance to corrosion and therefore remains stable tack-ling hypersaline water(>5 wt%),with a high salt rejection rate of 99.99%.This system shows an efficient desalination strategy that can provide fresh water from brines for agriculture and industry,and even for daily life.

关键词： carbon nanotubes electrothermal hypersaline water treatment interface evaporate pho-tothermal

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Dominant Charge Density Order in TaTe4

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Physical Review Letters 2024年第11期133卷 116403页

作者： Hongtao Rong Qiangqiang Gu Xue Yang Yihao Lin Chengcheng Zhang Yuan Wang Ruixin Guo Zhanyang Hao Yongqing Cai Fayuan Zhang Zhicheng Jiang Yichen Yang Qi Jiang Zhengtai Liu Mao Ye Shu Guo Le Wang Junhao Lin Li Lu Guangtong Liu Ji Feng Chaoyu Chen Shenzhen Institute for Quantum Science and Engineering (SIQSE) and Department of Physics Department of Physics School of Mathematical Science AI for Science Institute Beijing 100080 China Beijing National Research Center for Condensed Matter Physics Beijing 100190 China International Center for Quantum Materials School of Physics State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Hefei 230000 China Shenzhen 518107 China

Electronic orders such as charge density wave (CDW) and superconductivity raise exotic physics and phenomena as evidenced in recently discovered kagome superconductors and transition metal chalcogenides. In most materials, CDW induces a weak, perturbative effect, manifested as shadow bands, minigaps, resistivity kinks, etc. Here we demonstrate a unique example—transition metal tetratellurides TaTe4, in which the CDW order dominates the electronic structure and transport properties. Using angle-resolved photoemission spectroscopy, we found that the band structure of CDW TaTe4 is characterized by small, bulk electron pockets. Density functional theory analyses reveal their CDW origin from the folding of the original, large Fermi pockets. Importantly, the CDW induced pockets result in prominent frequencies in the quantum oscillation of the magnetoresistance. Satisfactory agreements are reached between results from photoemission spectroscopy, density functional theory, and quantum oscillation, concerning the shape, size, location, and angle dependence of the CDW pockets. Our results underline transition metal tetratellurides as an outstanding example for exploring the interplay between CDW, pressure induced superconductivity, and potential topological states under strong field.

关键词： Charge density waves Electronic structure First-principles calculations Angle-resolved photoemission spectroscopy Shubnikov-de Haas effect

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Anisotropic electrical properties of aligned PtSe_(2) nanoribbon arrays grown by a pre-patterned selective selenization process

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Nano research 2022年第5期15卷 4668-4676页

作者： Huaipeng Wang Zhifang Liu Yilin Sun Xiaofan Ping Jianlong Xu Yingtao Ding Haowen Hu Dan Xie Tianling Ren School of Integrated Circuits Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijing 100084China Department of Chemistry Tsinghua UniversityBeijing 100084China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

This study proposes a feasible and scalable production strategy to naturally obtain aligned platinum diselenide(PtSe_(2))nanoribbon arrays with anisotropic *** anisotropic properties of two-dimensional(2D)materials,especially transition-metal dichalcogenides(TMDs),have attracted great interest in *** dependence of physical properties on their lattice orientations is of particular interest because of its potential in diverse applications,such as nanoelectronics and ***-dimensional(1D)nanostructures facilitate many feasible production strategies for shaping 2D materials into unidirectional 1D nanostructures,providing methods to investigate the anisotropic properties of 2D materials based on their lattice orientations and *** natural alignment of zigzag(ZZ)PtSe_(2) nanoribbons is experimentally demonstrated using angle-resolved polarized Raman spectroscopy(ARPRS),and the selective growth mechanism is further theoretically revealed by comparing edges and edge energies of different orientations using the density functional theory(DFT).Back-gate field-effect transistors(FETs)are also constructed of unidirectional PtSe_(2) nanoribbons to investigate their anisotropic electrical properties,which align with the results of the projected density of states(DOS)*** work provides new insight into the anisotropic properties of 2D materials and a feasible investigation strategy from experimental and theoretical perspectives.

关键词： PtSe_(2) scalable production anisotropic properties nanoribbons density functional theory

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Recent Progress of Electrode materials for Flexible Perovskite Solar Cells

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Nano-Micro Letters 2022年第7期14卷 179-208页

作者： Yumeng Xu Zhenhua Lin Wei Wei Yue Hao Shengzhong Liu Jianyong Ouyang Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Department of Materials Science and Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore

Flexible perovskite solar cells(FPSCs) have attracted enormous interest in wearable and portable electronics due to their high power-per-weight and low cost. Flexible and efficient perovskite solar cells require the development of flexible electrodes compatible with the optoelectronic properties of perovskite. In this review, the recent progress of flexible electrodes used in FPSCs is comprehensively reviewed. The major features of flexible transparent electrodes, including transparent conductive oxides, conductive polymer, carbon nanomaterials and nanostructured metallic materials are systematically compared. And the corresponding modification strategies and device performance are summarized. Moreover, flexible opaque electrodes including metal films, opaque carbon materials and metal foils are critically assessed. Finally, the development directions and difficulties of flexible electrodes are given.

关键词： Flexible electrode Flexible perovskite solar cell Carbon nanomaterials Metallic nanostructures Conductive oxide

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