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Nano research 2024年第7期17卷 6212-6230页

作者： Heng Guo Jiawang Xie Guangzhi He Dezhi Zhu Ming Qiao Jianfeng Yan Jiachen Yu Jiaqun Li Yuzhi Zhao Ma Luo Haoze Han State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Ultrafast laser processing technology has offered a wide range of opportunities in micro/nano fabrication and other fields such as nanotechnology,biotechnology,energy science,and photonics due to its controllable processing precision,diverse processing capabilities,and broad material *** processing abilities and applications of the ultrafast laser still need more *** the field of material processing,controlling the atomic scale structure in nanomaterials is *** effects exist in ultrafast laser surface/interface processing,making it difficult to modulate the nanostructure and properties of the surface/interface as *** the ultrafast laser fabrication of micro functional devices,the processing ability needs to be ***,we review the research progress of ultrafast laser micro/nano fabrication in the areas of material processing,surface/interface controlling,and micro functional devices *** useful ultrafast laser processing methods and applications in these areas are *** various processing effects and abilities,the ultrafast laser processing technology has demonstrated application values in multiple fields from science to industry.

关键词： ultrafast laser micro/nano fabrication material processing surface/interface controlling devices fabrication

High Density 3D Carbon Tube Nanoarray Electrode Boosting the Capacitance of Filter Capacitor

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Nano-Micro Letters 2024年第11期16卷 242-254页

作者： Gan Chen Fangming Han Huachun Ma Pei Li Ziyan Zhou Pengxiang Wang Xiaoyan Li Guowen Meng Bingqing Wei Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China department of Materials Science and engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China department of mechanical engineering University of DelawareNewarkDE 19716USA Mechano‑X Institute Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic *** carbon-based nanoarray electrodes with precise alignment and smooth ion channels is crucial for enhancing EDLCs’***,controlling the density of macropore-dominated nanoarray electrodes poses challenges in boosting the capacitance of line-filtering ***,a simple technique to finely adjust the vertical-pore diameter and inter-spacing in three-dimensional nanoporous anodic aluminum oxide(3D-AAO)template is achieved,and 3D compactly arranged carbon tube(3D-CACT)nanoarrays are created as electrodes for symmetrical EDLCs using nanoporous 3D-AAO template-assisted chemical vapor deposition of *** 3D-CACT electrodes demonstrate a high surface area of 253.0 m^(2) g^(−1),a D/G band intensity ratio of 0.94,and a C/O atomic ratio of *** a result,the high-density 3D-CT nanoarray-based sandwich-type EDLCs demonstrate a record high specific areal capacitance of 3.23 mF cm^(-2) at 120 Hz and exceptional fast frequency response due to the vertically aligned and highly ordered nanoarray of closely packed CT *** 3D-CT nanoarray electrode-based EDLCs could serve as line filters in integrated circuits,aiding power system miniaturization.

关键词： Compactly arranged Three-dimensional carbon tube nanoarray Dimensional carbon tube nanoarray Fast frequency response Electric double-layer capacitors Layer capacitors AC line-filtering Filtering

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Collective Molecular Machines: Multidimensionality and Reconfigurability

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Nano-Micro Letters 2024年第8期16卷 309-340页

作者： Bin Wang Yuan Lu department of Chemical engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Molecular machines are key to cellular activity where they are involved in converting chemical and light energy into efficient mechanical *** the last 60 years,designing molecular structures capable of generating unidirectional mechanical motion at the nanoscale has been the topic of intense *** progress has been made,attributed to advances in various fields such as supramolecular chemistry,biology and nanotechnology,and ***,individual molecular machines are only capable of producing nanometer work and generally have only a single *** order to address these problems,collective behaviors realized by integrating several or more of these individual mechanical units in space and time have become a new *** this review,we comprehensively discuss recent developments in the collective behaviors of molecular *** particular,collective behavior is divided into two *** is the appropriate integration of molecular machines to efficiently amplify molecular motions and deformations to construct novel functional *** other is the construction of swarming modes at the supramolecular level to perform nanoscale or microscale *** discuss design strategies for both modes and focus on the modulation of features and ***,in order to address existing challenges,the idea of transferring experience gained in the field of micro/nano robotics is presented,offering prospects for future developments in the collective behavior of molecular machines.

关键词： Molecular machines Collective control Collective behaviors DNA Biomolecular motors

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Preparation of super-aligned carbon nanotube-reinforced nickel-matrix laminar composites with excellent mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2019年第1期26卷 133-141页

作者： Ze-cheng Hou Lun-qiao Xiong Yuan-feng Liu Lin Zhu Wen-zhen Li School of Materials Science and engineering Tsinghua University tsinghua-foxconn nanotechnology research center Tsinghua University

A homogeneous and compact super-aligned carbon nanotube(SACNT)-reinforced nickel-matrix composite was successfully prepared by electrodeposition. The mechanical properties of the laminar SACNT/Ni composites were substantially improved compared with those of pure nickel. With increasing content of SACNTs, the tensile strength of the composite increased and the elongation decreased because of the high-strength SACNTs bearing part of an applied load and the fine-grained strengthening mechanism. The nanohardness of the SACNT/Ni composites was improved from 3.92 GPa(pure nickel) to 4.62 GPa(Ni-4 vol%SACNTs). The uniform distribution of SACNTs in the composites and strong interfacial bonding between the SACNTs and the nickel matrix resulted in an improvement of the mechanical properties of the SACNT/Ni composites. The introduced SACNTs refined the nickel grains, increased the amount of crystal twins, and changed the preferred orientation of grain growth.

关键词： nickel-matrix laminar composite super-aligned carbon nanotube electrodeposition mechanical properties

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Advances of CNT-based systems in thermal management

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Nano research 2021年第8期14卷 2471-2490页

作者： Wei Yu Changhong Liu Shoushan Fan tsinghua-foxconn nanotechnology research center and department of Physics Tsinghua UniversityBeijing 100084China

Effective thermal management has become extremely urgent for electronics due to the massive heat originated from the ever-rising power *** the merits of high thermal conductivity,good chemical stability and desirable mechanical properties,carbon nanotubes(CNTs)are considered to have great potential to be widely used in heat dissipation *** article describes the progress on thermal conductivity of CNT-reinforced composites,aligned CNT materials(aligned CNT arrays,films/buckypapers and fibers)as high thermal conductors,experimental and theoretical results of CNT-substrate interface resistance,and utilizations of CNTs in the passive heat dissipation(natural convection,heat radiation,and phase-change heat transfer).Finally,the challenges and prospects are discussed to provide some hints in the future *** is believed that CNTs can play an important role in thermal management of electronics,especially in the portable electronic devices.

关键词： carbon nanotubes thermal management passive heat dissipation thermal interface materials thermal interface resistance

Applications of carbon nanotubes in high performance lithium ion batteries

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Frontiers of physics 2014年第3期9卷 351-369页

作者： Yang Wu Jiaping Wang Kaili Jiang Shoushan Fant department of Physics and tsinghua-foxconn nanotechnology research center Tsinghua University Beijing 100084 China

The development of lit;triton ion batteries （LIBs） relies on the improvement in the performance of electrode materials with higher capacity, higher rate capability, and longer cycle lift;. In this review article, the recent advances in carbon nanotube （CNT） anodes, CNT-based composite electrodes, and CNT current collectors for high performance LIBs are concerned. CNT has received considerable attentions as a candidate material for the LIB applications. In addition to a possible choice for anode, CNT has been recognized as a solution in improving the performance of the state-of-the-art electrode materials. The CNT-based composite electrodes can be fabricated by mechanical or chem- ical approaches. Owing to the large aspect ratio and the high electrical conductivity, CNTs at very low loading can lead to an efficient conductive network. The excellent mechanical strength suggests the great potential in forming a structure scaffold to accommodate nano-sized electrode materials. Accordingly, the incorporation of CNTs will enhance the conductivity of the composite electrodes, mitigatc the agglomeration problem, decrease the dependence on inactive binders, and improve the clcctrochenfical properties of both anode and cathode materials remarkably. Freestanding CNT network can be used as lightweight current collectors to increase the overall energy density of LIBs. Finally, research perspectives for exploiting CNTs in high-performance LIBs are discussed.

关键词： lithium ion battery carbon nanotube composite conductive additive structural scaffold

A stretchable,asymmetric,coaxial fiber-shaped supercapacitor for wearable electronics

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Nano research 2020年第6期13卷 1686-1692页

作者： Hua Yuan Guang Wang Yuxing Zhao Yang Liu Yang Wu Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics and department of Physics Tsinghua UniversityBeijing100084China tsinghua-foxconn nanotechnology research center Department of Mechanical EngineeringTsinghua UniversityBeijing100084China

Nano research volume 13,pages1686–1692(2020)Cite this article 210 Accesses 1 Citations Metrics details Abstract Fiber-shaped supercapacitors(FSCs),owing to their high-power density and feasibility to be integrated into woven clothes,have drawn tremendous attentions as a key device for flexible energy ***,how to store more energy while withstanding various types of mechanical deformation is still a challenge for ***,based on a magnetron sputtering method,different pseudocapacitive materials are conformally coated on self-supported carbon nanotube aligned *** fabrication approach enables a stretchable,asymmetric,coaxial fiber-shaped supercapacitors with high *** asymmetric electrode configuration that consists of CNT@NiO@MnOx cathode and CNT@Fe2O3 anode successfully extends the FSC’s electrochemical window to 1.8 V in an aqueous *** a result,a high specific capacitance of 10.4 F·cm^−3 is achieved at a current density of 30 mA·cm^−3 corresponding to a high energy density of 4.7 mWh·cm^−*** mechanical stability of the stretchable FSC is demonstrated with a sustainable performance under strains up to 75%and a capacitance retention of 95%after 2,000 cycles under 75%strain.

关键词： fiber supercapacitor asymmetric configuration coaxial magnetron sputtering pseudocapacitive material

Growth of large scale PtTe,PtTe_(2) and PtSe_(2) films on a wide range of substrates

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Nano research 2021年第6期14卷 1663-1667页

作者： Kenan Zhang Meng Wang Xue Zhou Yuan Wang Shengchun Shen Ke Deng Huining Peng Jiaheng Li Xubo Lai Liuwan Zhang Yang Wu Wenhui Duan Pu Yu Shuyun Zhou State key Laboratory of Low Dimensional Quantum Physics and department of Physics Tsinghua UniversityBeijing100084China department of mechanical engineering and tsinghua-foxconn nanotechnology research center Tsinghua UniversityBeijing100084China Collaborative Innovation center of Quantum Matter Beijing100084China

1T phase of transition metal dichalcogenides(TMDCs)formed by group 10 transition metals(***,Pd)have attracted increasing interests due to their novel properties and potential device *** of large scale thin films with controlled phase is critical especially considering that these materials have relatively strong interlayer interaction and are difficult to *** we report the growth of centimeter-scale PtTe,1T-PtTe2 and 1T-PtSe2 films via direct deposition of Pt metals followed by tellurization or *** find that by controlling the Te flux,a hitherto-unexplored PtTe phase can also be obtained,which can be further tuned into PtTe2 by high temperature annealing under Te *** films with different thickness can be grown on a wide range of substrates,including NaCl which can be further dissolved to obtain free-standing PtTe2 or PtSe2 ***,a systematic thickness dependent resistivity and Hall conductivity measurements show that distinguished from the semiconducting PtSe2 with hole carriers,PtTe2 and PtTe films are *** work opens new opportunities for investigating the physical properties and potential applications of group 10 TMDC films and the new monochalcogenide PtTe film.

关键词： transition metal dichalcogenides(TMDCs) selenization tellurization PtSe2 PtTe2 PtTe

High-Chern-number and high-temperature quantum Hall effect without Landau levels

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National Science Review 2020年第8期7卷 1280-1287页

作者： Jun Ge Yanzhao Liu Jiaheng Li Hao Li Tianchuang Luo Yang Wu Yong Xu Jian Wang International center for Quantum Materials School of Physics Peking University State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University School of Materials Science and engineering Tsinghua University tsinghua-foxconn nanotechnology research center and department of Physics Tsinghua University department of mechanical engineering Tsinghua University Frontier Science center for Quantum Information CAS center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

The quantum Hall effect（QHE） with quantized Hall resistance of h/νe;started the research on topological quantum states and laid the foundation of topology in physics. Since then, Haldane proposed the QHE without Landau levels, showing nonzero Chern number |C| = 1, which has been experimentally observed at relatively low temperatures. For emerging physics and low-power-consumption electronics, the key issues are how to increase the working temperature and realize high Chern numbers（C > 1）. Here, we report the experimental discovery of high-Chern-number QHE（C = 2） without Landau levels and C = 1 Chern insulator state displaying a nearly quantized Hall resistance plateau above the Néel temperature in MnBi;Te;devices. Our observations provide a new perspective on topological matter and open new avenues for exploration of exotic topological quantum states and topological phase transitions at higher temperatures.

关键词： quantum Hall effect without Landau levels Chern insulator topological matter topological quantum states high Chern number high temperature

Cross-stacked super-aligned carbon nanotube/activated carbon composite electrodes for efficient water purification via capacitive deionization enhanced ultrafiltration

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Frontiers of Environmental Science & engineering 2020年第6期14卷 181-190页

作者： Min Li Shuai Liang Yang Wu Meiyue Yang Xia Huang Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China department of mechanical engineering and tsinghua foxconn nanotechnology research center Tsinghua UniversityBeijing 100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

The practical application of the capacitive deionization(CDI)enhanced ultrafiltration(CUF)technology is hampered due to low performance of *** current study demonstrated a novel super-aligned carbon nanotube(SACNT)/activated carbon(AC)composite electrode,which was prepared through coating AC on a cross-stacked SACNT *** desalination capability and water purification performance of the prepared electrode were systematically investigated at different applied voltages(0.8-1.2 V)with a CDI system and a CUF system,*** the CDI tests,as compared with 5ie control AC electrode,the SACNT/AC electrode achieved an approximately 100%increase in both maximum salt adsorption capacity and average salt adsorption rate under all the applied voltage conditions,demonstrating a superior desalination ***,a conspicuous increase by an average of-26%in charge efficiency was also achieved at all the *** the CUF tests,as compared with the control run at 0 V,the treatment runs at 0.8,1.0,and 1.2 V achieved a 2.40-fold,2.08-fold,and 2.43-fold reduction in membrane fouling(calculated according to the final transmembrane pressure(TMP)data at the end of every purification stage),*** average TMP increasing rates at 0.8,1.0,and 1.2 V were also roughly two times smaller than that at 0 V,indicating a dramatical reduction of membrane *** SACNT/AC electrode also maintained its superior desalination capability in the CUF process,resulting in an overall improved water purification efficiency.

关键词： Carbon nanotube Super aligned Conductive membrane Capacitive deionization Ultrafiltration Desalination