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On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 107-113页

作者： QingQi Zeng GangXu Gu Gang Shi jianlei shen Bei Ding Shu Zhang XueKui Xi Claudia Felser YongQing Li EnKe Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy University of CaliforniaLos Angeles 90095USA Max Planck Institute for Chemical Physics of Solids Dresden D-01187Germany Songshan Lake Materials Laboratory Dongguan 523808China

Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic Weyl semimetal Co_(3)Sn_(2)S_(2), we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co_(3)Sn_(2)S_(2) or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with Weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.

关键词： hard-magnetic material magnetic Weyl semimetal magnetoresistance Hall effect

Aggregation-induced emission luminogen for specific identification of malignant tumour in vivo

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Science China Chemistry 2020年第3期63卷 393-397页

作者： jianlei shen Kun Tao Peilin Gu Chen Gui Dong Wang Zhenyu Tan Lihua Wang Zhiming Wang Anjun Qin Ben Zhong Tang Shisan Bao School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Tongren Hospital School of MedicineShanghai Jiao Tong UniversityShanghai 200240China Discipline of Pathology Bosch Institute and School of Medical SciencesCharles Perkins CentreThe University of SydneyAustralia Division of Physical Biology CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Department of Chemistry HKUST Jockey Club Institute for Advanced StudyInstitute of Molecular Functional MaterialsDivision of Biomedical EngineeringState Key Laboratory of Molecular NeuroscienceDivision of Life ScienceThe Hong Kong University of Science and TechnologyHong KongChina State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

Colorectal cancer(CRC)is still a major killer,mainly due to the lack of early detection biomarker with sensitivity/*** histopathology is the gold standard approach in practice,but there are still some issues(false diagnosis and long waiting period).Aggregation-induced emission(AIE)is a novel photophysical phenomenon which has been widely utilized for biological imaging in vitro,including malignant cells,showing remarkable imaging contrast and enhanced emission in high concentrated ***,it is unclear if AIE dyes can identify malignant cells specifically in vivo.A great challenge for specific labeling of malignant cells is probably ascribed to the complex compositions in tumor ***,an AIE dye-based mitochondria-targeted histological staining strategy was employed to localize cancer and the metastatic track in the fresh colorectal *** novel approach holds great potential to revolutionize the clinical diagnosis and intervention for devastating malignancy.

关键词： aggregation-induced emission histological staining colorectal cancer

Phase transferring luminescent gold nanoclusters via single-stranded DNA

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Science China Chemistry 2022年第6期65卷 1212-1220页

作者： Yu Li Hui Lu Zhibei Qu Mingqiang Li Haoran Zheng Peilin Gu Jiye Shi Jiang Li Qian Li Lihua Wang Jing Chen Chunhai Fan jianlei shen Division of Physical Biology CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai200240China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200127China

Atomically precise gold nanoclusters(Au NCs) are an emerging class of quantum-sized nanomaterials with discrete electronic energy levels, which has led to a range of attractive electronic and optical applications. Nevertheless, the lack of general methods to transfer Au NCs protected with hydrophobic ligands to an aqueous solution hampers their use in physiological settings. Here,we developed a single-stranded DNA-based approach that could transfer ~90% hydrophobic Au NCs into an aqueous *** experimentally and theoretically established that multivalent electrostatic and hydrophobic interactions between DNA strands and the hydrophobic ligand layer on Au NCs resulted in monodispersed DNA-coated Au NCs with high physical integrity in an aqueous solution. The fluorescence quantum yield of Au NCs was increased by ~13 fold, and surface-constrained DNA retained the specific recognition ability for biosensing. We further demonstrated the versatility of this phase-transfer approach, which thus holds great potential to advance biological and medical applications of Au NCs.

关键词： gold nanoclusters DNA monodispersed phase transfer biological application

Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy

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Chinese Physics Letters 2020年第7期37卷 47-50页

作者： Qingqi Zeng jianlei shen Enke Liu Xuekui Xi Wenhong Wang Guangheng Wu Xixiang Zhang Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Physical Science and Engineering Division(PSE) King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

The hydrostatic pressure is expected to be an effective knob to tune the magnetostructural phase transitions of hexagonal MM’X alloys(M and M’denote transition metals and X represents main group elements).We perform magnetization measurements under hydrostatic pressure on an MM’X martensitic MnNi0.77Fe0.23Ge *** magnetostructural transition temperature can be efficiently tuned to lower temperatures by applying moderate pressures,with a giant shift rate of-151 K/GPa.A temperature span of 30 K is obtained under the pressure,within which a large magnetic entropy change of-23 J·kg-1K-1 in a field change of 5 T is induced by the mechanical energy gain due to the large volume ***,a decoupling of structural and magnetic transitions is observed at low temperatures when the martensitic transition temperature is lower than the Curie *** results show a multi-parameter tunable caloric effect that benefits the solid-state cooling.

关键词： temperature. transitions martensitic

Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co_(3)Sn_(2)S_(2)

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Science China(Physics,Mechanics & Astronomy) 2021年第5期64卷 82-90页

作者： Chang Liu ChangJiang Yi XingYu Wang jianlei shen Tao Xie Lin Yang Tom Fenne Uwe Stuhr ShiLiang Li HongMing Weng YouGuo Shi EnKe Liu HuiQian Luo Beijing National Laboratory for Condensed Matter Physics Institute of PhysiesChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBejing 100190China Laboratory for Neutron Scattering and Imaging Paul Scherrer InstituteVlligen CH-5232Switzerland Songshan Lake Materials Laboratory Dongguan 523808China SCAS Centre for Excelence in Topological Quantum Computation Bejing 100190China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China

Co_(3)Sn_(2)S_(2) is a recently identified magnetic Weyl semimetal in Shandite compounds. Upon cooling, Co_(3)Sn_(2)S_(2) undergoes a ferromagnetic transition with c-axis polarized moments(0.3 μ_(B)/Co) around T_(C)= 175 K, followed by another magnetic anomaly around T_(A)≈ 140 K. A large intrinsic anomalous Hall effect is observed in the magnetic state below TC with a maximum of anomalous Hall angle near T_(A). Here, we report an elastic neutron scattering on the crystalline lattice of Co_(3)Sn_(2)S_(2) in a magnetic field up to 10 T. A strongly anisotropic magnetoelastic response is observed, while only a slight enhancement of the Bragg peaks is observed when B//c. The in-plane magnetic field(B//ab) dramatically suppresses the Bragg peak intensity probably by tilting the moments and lattice toward the external field direction. The in-plane magnetoelastic response commences from T_(C), and as it is further strengthened below T_(A), it becomes nonmonotonic against the field between T_(A) and T_(C) because of the competition from another in-plane magnetic order. These results suggest that a magnetic field can be employed to tune the Co_(3)Sn_(2)S_(2) lattice and its related topological states.

关键词： Weyl semimetal magneto-elastic coupling topological materials elastic neutron scattering ferromagnetism

Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification

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Nano Research 2015年第3期8卷 731-742页

作者： jianlei shen Jing Su Juan Yan Bin Zhao Dongfang Wang Siyi Wang Kun Li Mengmeng Liu Yao He Sanjay Mathur Chunhai Fan Shiping Song Division of Physical Biology & Bioimaging Center Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices Soochow University Suzhou 215123 China Institute of Inorganic Chemistry University of Cologne D-50939 Cologne Germany

Uniform silver-containing metal nanostructures with well-defined nanogaps hold great promise for ultrasensitive surface-enhanced Raman scattering （SERS） analyses. Nevertheless, the direct synthesis of such nanostructures with strong and stable SERS signals remains extremely challenging. Here, we report a DNA-mediated approach for the direct synthesis of gold-silver nano-mushrooms with interior nanogaps. The SERS intensities of these nano-mushrooms were critically dependent on the area of the nanogap between the gold head and the silver cap. We found that the formation of nanogaps was finely tunable by controlling the surface density of 6-carboxy-X-rhodamine （ROX） labeled single-stranded DNA （ssDNA） on the gold nanoparticles. We obtained nano-mushrooms in high yield with a high SERS signal enhancement factor of -1.0×109, much higher than that for Au-Ag nanostructures without nanogaps. Measurements for single nano- mushrooms show that these structures have both sensitive and reproducible SERS signals.

关键词： surface-enhanced Ramanscattering biometallic nanostructure nano-mushroom nanogap gold nanoparticle

Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 3-9页

作者： Chang Liu jianlei shen JiaCheng Gao ChangJiang Yi Di Liu Tao Xie Lin Yang Sergey Danilkin GuoChu Deng WenHong Wang ShiLiang Li YouGuo Shi HongMing Weng EnKe Liu HuiQian Luo Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China Australian Centre for Neutron Scattering Australian Nuclear Science and Technology OrganizationLucas HeightsNSW2234Australia Songshan Lake Materials Laboratory Dongguan523808China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing101407China

We report a comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 with a quasi-two-dimensional *** in-plane and out-of-plane dispersions of the spin waves were revealed in the ferromagnetic ***,dispersive but damped spin excitations were found in the paramagnetic *** effective exchange interactions were estimated using a semi-classical Heisenberg model to consistently reproduce the experimental TCand spin ***,a full spin wave gap below Eg=2.3 meV was observed at T=4 *** value was considerably larger than the estimated magnetic anisotropy energy(~0.6 meV),and its temperature dependence indicated a significant contribution from the Weyl *** results suggest that Co3Sn2S2 is a three-dimensional correlated system with a large spin stiffness,and the low-energy spin dynamics can interplay with the topological electron states.

关键词： magnetic Weyl semimetal topological materials spin excitations neutron scattering

Enhanced charge collection of AgNWs-based top electrode to realize high-performance,all-solution processed organic solar cells

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Science China Chemistry 2024年第10期67卷 3347-3356页

作者： Juanyong Wan Yang Chen Weijie Chen Jinfeng Xia Guang Zeng jianlei Cao Chuang Jin Yunxiu shen Xiaoxiao Wu Haiyang Chen Junyuan Ding Xue-mei Ou Yaowen Li Yongfang Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Jiangsu Sidike New Materials Science and Technology Co. Ltd.Suqian 215400China

All-solution processed organic solar cells are the ultimate aim of printable photovoltaics,but their electrical losses arising from poor contact of top electrodes greatly limit efficiency *** solve the problem,a solution-processed hybrid top electrode was constructed using silver nanowires(AgNWs)as the skeleton and ZnO nanoparticles(ZnO-NPs)as the *** constructing the skeleton,a spin-rinsing treatment was first used to reduce the amount of the residual insulating polyvinylpyrrolidone wrapped around the AgNWs to promote intimate contact among the AgNWs in the ***,the ZnO-NPs matrix was deposited onto the AgNWs skeleton,bridging the AgNWs skeleton with the underlayer ZnO-NPs electron transporting layer(ETL).The underlayer ZnO-NPs ETL can also induce the growth of the ZnO-NPs matrix to minimize lattice mismatch,which creates additional transport channels from the ETL to the AgNWs skeleton for charge *** a result,the obtained electrode significantly enhances the electrical contact in the device,thus delivering record power conversion efficiencies of 16.04%and 14.54%for rigid and flexible all-solution processed OSCs,respectively.

关键词： solution-processed top electrode organic solar cells AgNWs electrical contact

微小型AUV模型辅助技术在惯性导航中的应用

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计算机测量与控制 2011年第8期19卷 1987-1991页

作者：沈剑蕾战兴群杜刚上海交通大学航空航天学院上海200240

针对微小型水下潜器在无法获得GPS信号的情况,设计了一种模型辅助的全自主惯性导航系统;由于体积和功耗的限制,本系统无法采用传统的多普勒测速仪作为外部传感器,而提出了以惯性导航系统为核心,运动模型辅助的方法;根据水下潜器的运动... 详细信息

针对微小型水下潜器在无法获得GPS信号的情况,设计了一种模型辅助的全自主惯性导航系统;由于体积和功耗的限制,本系统无法采用传统的多普勒测速仪作为外部传感器,而提出了以惯性导航系统为核心,运动模型辅助的方法;根据水下潜器的运动特性进行数学建模,与卡尔曼滤波构成回路,运动模型输出位置、速度等信息对捷联解算输出信息进行误差补偿;搭建了基于Simulink的实验仿真环境,验证了该方法的有效性,能够满足微小型AUV对于导航系统体积、成本和功耗的要求,一小时的定位误差小于500m。

关键词： AUV 惯性导航模型辅助卡尔曼滤波