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Carbon nanotube fibers with excellent mechanical and electrical properties by structural realigning and densification

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nano Research 2023年第11期16卷 12762-12771页

作者： Kunjie Wu Bin Wang Yutao Niu Wenjing Wang Cao Wu Tao Zhou Li Chen Xianghe Zhan Ziyao Wan Shan Wang Zhengpeng Yang Yichi Zhang Liwen Zhang Yongyi Zhang Zhenzhong Yong Muqiang Jian Qingwen Li Key Laboratory of Multifunctional nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China division of nanomaterials and Jiangxi Key Lab of Carbonene materials Jiangxi Institute of NanotechnologyNanchang 330200China School of nano-Tech and nano-Bionics University of Science and Technology of ChinaHefei 230026China Henan Key Laboratory of materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003China Beijing Graphene Institute(BGI) Beijing 100095China

Floating catalysis chemical vapor deposition(FCCVD)direct spinning process is an attractive method for fabrication of carbon nanotube fibers(CNTFs).However,the intrinsic structural defects,such as entanglement of the constituent carbon nanotubes(CNTs)and inter-tube gaps within the FCCVD CNTFs,hinder the enhancement of mechanical/electrical properties and the realization of practical applications of ***,achieving a comprehensive reassembly of CNTFs with both high alignment and dense packing is particularly ***,an efficient reinforcing strategy for FCCVD CNTFs was developed,involving chlorosulfonic acid-assisted wet stretching for CNT realigning and mechanical rolling for *** reveal the intrinsic relationship between the microstructure and the mechanical/electrical properties of CNTFs,the microstructure evolution of the CNTFs was characterized by cross-sectional scanning electron microscopy(SEM),wide angle X-ray scattering(WAXS),polarized Raman spectroscopy and Brunauer–Emmett–Teller(BET)*** results demonstrate that this strategy can improve the CNT alignment and eliminate the inter-tube voids in the CNTFs,which will lead to the decrease of mean distance between CNTs and increase of inter-tube contact area,resulting in the enhanced inter-tube van der Waals *** microstructural evolutions are beneficial to the load transfer and electron transport between CNTs,and are the main cause of the significant enhancement of mechanical and electrical properties of the ***,the tensile strength,elastic modulus and electrical conductivity of the high-performance CNTFs are 7.67 GPa,230 GPa and 4.36×10^(6)S/m,*** paves the way for further applications of CNTFs in high-end functional composites.

关键词： carbon nanotube fibers mechanical property electrical property alignment packing density

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Glutathione-capped quantum dots for plasma membrane labeling and membrane potential imaging

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nano Research 2019年第6期12卷 1321-1326页

作者： Guangcun Chen Yejun Zhang Zhao Peng Dehua Huang Chunyan Li Qiangbin Wang CAS Key Laboratory of nano-Bio Interface Division of Nanobiomedicine and i-LabCAS Center for Excellence in Brain ScienceSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of nano Technology and nano Bionics University of Science and Technology of ChinaHefei 230026China College of materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

The plasma membrane of cells is a crucial biological membrane that involved in a variety of cellular processes including cell signaling transduction through membrane electrical ***,monitoring membrane electrical activity using fluorescence imaging has attracted numerous attentions for its potential applications in evaluating how the nervous system ***,the development of ideal fluorescent voltage-sensitive probes with both high membrane labeling efficiency and voltage sensitivity is still retain a big ***,glutathionecapped CdSe@ZnS quantum dots (CdSe@ZnS-GSH QDs) with a size of 2.5 nm and an emission peak at 520 nm are synthesized using a facile ligand exchange method for plasma membrane labeling and membrane potential *** as-synthesized CdSe@ZnS-GSH QDs can effectively label cell membrane at neutral pH within 30 min and exhibit excellent optical stability in continuous imaging for up to 60 *** the test concentration up to 200 nM,CdSe@ZnS-GSH QDs show high biocompatibility to cells and do not affect cell proliferation,disturb cell membrane integrity or cause apoptosis and necrosis of ***,a two-component voltage sensor strategy based on fluorescence resonance energy transfer (FRET) between CdSe@ZnS-GSH QDs and the dipicrylamine (DPA) is successfully developed to monitor the membrane potential by the fluorescence of CdSe@ZnS-GSH *** study offers a facile strategy for labeling plasma membrane and monitoring the membrane potential of cells and will hold great potential in the research of signaling within intact neuronal circuits.

关键词： quantum dots membrane labeling membrane potential imaging fluorescence imaging neuron

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Strain effects on optical polarisation properties in (11■2) plane GaN films

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Chinese Physics B 2010年第11期19卷 542-547页

作者：郝国栋陈涌海范亚明黄晓辉王怀兵 nano-Devices and materials division Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of Sciences Key Laboratory of Semiconductor materials Science Institute of SemiconductorsChinese Academy of Sciences

We present the theoretical results of the electronic band structure of wurtzite GaN films under biaxial strains in the （11^-22）-plane. The calculations are performed by the k.p perturbation theory approach through using the effectivemass Hamiltonian for an arbitrary direction. The results show that the transition energies decrease with the biaxial strains changing from -0.5% to 0.5%. For films of （11^-22）-plane, the strains are expected to be anisotropic in the growth plane. Such anisotropic strains give rise to valence band mixing which results in dramatic change in optical polarisation property. The strain can also result in optical polarisation switching phenomena. Finally, we discuss the applications of these properties to the （1132） plane GaN-based light-emitting diode and lase diode.

关键词： GaN (11-22)-plane strain optical anisotropy

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Oxygen content and magnetic properties of composites La_(0.75)Sr_(0.25)MnO_(3±δ) dcalcined at different temperatures

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Rare Metals 2014年第4期33卷 452-458页

作者： Deng-Hui Ji Xue Hou Gui-De Tang Zhuang-Zhi Li Deng-Lu Hou Ming-Gang Zhu Hebei advanced Thin Films Laboratory Department of PhysicsHebei Normal University division of Functional materials Research Central Iron & Steel Research Institute

The effects of the calcination temperature on the oxygen content and magnetic properties of the nano- crystalline perovskite manganite Lao.75Sro.25MnO3±δ pre- pared by the sol-gel method were investigated. The highest temperatures at which the samples were calcined were 973, 1073, 1273, and 1473 K. The X-ray diffraction （XRD） analyses indicate that all the samples have only a single phase with the R3c perovskite structure. As the calcination temperature and calcination time increase, the oxygen content in the samples increases from being deficient to being in excess of that in the stoichiometric formula. The crystallite size also increases from 23 to 283 nm. Magnetic measurements indicate that the sample calcined at 1073 K has the highest Curie temperature. This is owing to the fact that the crystallite cores of this sample have stoichiometric oxygen content. The dependence of the Curie temperature and the saturation magnetization on the calcination tem- perature are successfully explained.

关键词： Perovskite manganite Magnetic property Oxygen content Sol-gel method

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1.82 wt.% Pt/N, P co-doped carbon overwhelms 20 wt.% Pt/C as a high-efficiency electrocatalyst for hydrogen evolution reaction

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nano Research 2017年第1期10卷 238-246页

作者： Changhong Wang Feng Hu Hongchao Yang Yejun Zhang Huan Lu Qiangbin Wang Key Laboratory of nano-Bio Interface Division of Nanobiomedicine and i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China School of nano-Tech and nano-Bionics University of Science and Technology of China Suzhou 215123 China

Cost-effective electrocatalysts for the hydrogen evolution reaction （HER） play a key role in the field of renewable energy. Although tremendous efforts have been devoted to the search of alternative materials, Pt/C is still the most efficient electrocatalyst for the HER. Nevertheless, decreasing the loading of Pt in the designed eletrocatalysts is of significance. However, with low Pt loading, it is challenging to maintain excellent catalytic performance. Herein, a new catalyst （Pt/NPC） was prepared by dispersing Pt nanoparticles （PtNPs） with an average diameter of 1.8 nm over a three-dimensional （3D） carbon network co-doped with N and P. Because of the high electronegativity of the N and P dopants, PtNPs were uniformly dispersed on the carbon network via high electronic affinity between Pt and carbon, affording a Pt/NPC catalyst; Pt/NPC exhibited superior HER activity, attributed to the down-shift of the Pt d-band caused by the donation of charge from N and P to Pt. The results show that Pt/NPC with an ultralow Pt loading of 1.82 wt.% exhibits excellent HER performance, which corresponds to a HER mass activity 20.6-fold greater than that observed for commercial 20% Pt/C at an overpotential of 20 mV vs. RHE.

关键词： electrocatalysis Pt N and P co-doped carbon hydrogen evolution reaction

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All Binder-Free Electrodes for High-Performance Wearable Aqueous Rechargeable Sodium-Ion Batteries

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nano-Micro Letters 2019年第4期11卷 766-777页

作者： Bing He Ping Man Qichong Zhang Huili Fu Zhenyu Zhou Chaowei Li Qiulong Li Lei Wei Yagang Yao division of advanced nanomaterials Key Laboratory of Nanodevices and ApplicationsJoint Key Laboratory of Functional Nanomaterials and DevicesCAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123People’s Republic of China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of nano Technology and nano Bionics University of Science and Technology of ChinaHefei 230026People’s Republic of China division of nanomaterials Suzhou Institute of Nano-Tech and Nano-BionicsNanchangChinese Academy of SciencesNanchang 330200People’s Republic of China School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueJurong West 639798Singapore

Extensive efforts have recently been devoted to the construction of aqueous rechargeable sodium-ion batteries(ARSIBs)for large-scale energy-storage applications due to their desired properties of abundant sodium resources and inherently safer aqueous ***,it is still a significant challenge to develop highly flexible ARSIBs ascribing to the lack of flexible electrode *** this work,nanocube-like KNiFe(CN)6(KNHCF)and rugby balllike NaTi2(PO4)3(NTP)are grown on carbon nanotube fibers via simple and mild methods as the flexible binder-free cathode(KNHCF@CNTF)and anode(NTP@CNTF),*** advantage of their high conductivity,fast charge transport paths,and large accessible surface area,the as-fabricated binder-free electrodes display admirable electrochemical *** by the remarkable flexibility of the binder-free electrodes and the synergy of KNHCF@CNTF and NTP@CNTF,a high-performance quasi-solid-state fiber-shaped ARSIB(FARSIB)is successfully assembled for the first ***,the as-assembled FARSIB possesses a high capacity of 34.21 mAh cm?3 and impressive energy density of 39.32 mWh cm?*** encouragingly,our FARSIB delivers superior mechanical flexibility with only 5.7%of initial capacity loss after bending at 90°for over 3000 ***,this work opens up an avenue to design ultraflexible ARSIBs based on all binder-free electrodes for powering wearable and portable electronics.

关键词： Carbon nanotube fiber Binder-free electrode Flexibility Aqueous rechargeable energy-storage device Sodium-ion battery

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Pure and Mg-doped self-assembled ZnO nano-particles for the enhanced photocatalytic degradation of 4-chlorophenol

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Journal of Environmental Sciences 2013年第10期25卷 2157-2167页

作者： N.Clament Sagaya Selvam S.Narayanan L.John Kennedy J.Judith Vijaya Catalysis and nanomaterials Research Laboratory Department of Chemistry Loyola College materials division School of Advanced Sciences Vellore Institute of Technology UniversityChennai Campus

A novel self-assembled pure and Mg doped ZnO nano-particles （NPs） were successfully synthesized by a simple low temperature co-precipitation method. The prepared photocatalysts were characterized by X-ray diffraction, high resolution scanning electron mi- croscopy, high resolution transmission electron microscopy, diffuse reflectance spectroscopy and photoluminescence （PL） spectroscopy. The results indicated that the prepared photocatalysts showed high crystallinity with a uniform size distribution of the NPs. The degradation of cholorphenols is highly mandatory in today＇s scenario as they are affecting the environment adversely. Thus, the photocatalytic degradation of 4-chlorophenol （4-CP）, a potent endocrine disrupting chemical in aqueous medium was investigated by both pure and Mg-doped ZnO NPs under UV-light irradiation in the present study. The influence of the Mg content on the structure, morphology, PL character and photocatalytic activity of ZnO NPs were investigated systematically. Furthermore,the effect of different parameters such as 4-CP concentration, photocatalyst amount, pH and UV-light wavelength on the resulting photocatalytic activity was investigated.

关键词： Mg-doped ZnO nanoparticles photocatalyst photocatalytic degradation 4-chlorophenol

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Uncovering growth species of multivariate MOFs in liquid phase by mass spectrometry

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Chinese Chemical Letters 2022年第8期33卷 3993-3998页

作者： Jinli Han Suming Chen Xiaochun Zhou Hexiang Deng Key Laboratory of Biomedical Polymers-Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China division of advanced nanomaterials Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of SciencesSuzhou 215125China The Institute for advanced Studies Wuhan UniversityWuhan 430072China

The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal ***,we report the detection of growth species for a series of MOFs with mono-linker,CuMOF-2-BDC and Cu-MOF-2-NDC,and two linkers,MTV-MOF-2-(C_(4)H_(4))x,by high resolution ESI-MS,where a large variety of Cu-containing species are identified *** solvent molecules such as H_(2)O,methanol and DMF participate in the formation of these species,other than ***,in the growth solution of MTV-MOF-2-(C_(4)H_(4))x,growth species containing two different organic linkers are *** feeding ratio is not the only factor controlling the distribution of growth species for MTVMOFs,but also the solvent involves in coordination,an aspect usually overlooked previously.

关键词： Metal-organic framework Multivariate MOFs Mass spectrometry Growth species Self-assembly

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Understanding and unveiling the electro-chemo-mechanical behavior in solid-state batteries

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SusMat 2024年第2期4卷 75-88页

作者： Yunlei Zhong Xia Zhang Yong Zhang Peng Jia Yuebin Xi Lixing Kang Zhenjiang Yu Key Laboratory of Multifunctional nanomaterials and Smart Systems Division of Advanced MaterialsSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouChina Institute of Applied materials Helmholtz Centre Berlin for Materials and EnergyBerlinGermany School of Electronic and Information Engineering Changshu Institute of TechnologyChangshuJiangsuChina State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyJinanShandongChina

Solid-state batteries(SSBs)are attracting growing interest as long-lasting,thermally resilient,and high-safe energy storage *** an emerging area of battery chemistry,there are many issues with SSBs,including strongly reductive lithium anodes,oxidized cathodes(state of charge),the thermodynamic stability limits of solid-state electrolytes(SSEs),and the ubiquitous and critical *** this Review,we provided an overview of the main obstacles in the development of SSBs,such as the lithium anode|SSEs interface,the cathode|SSEs interface,lithium-ion transport in the SSEs,and the root origin of lithium intrusions,as well as the safety issues caused by the *** and overcoming these obstacles are crucial but also extremely challenging as the localized and buried nature of the intimate contact between electrode and SSEs makes direct detection *** reviewed advanced characterization techniques and discussed the complex ion/electron-transport mechanism that have been plaguing ***,we focused on studying and revealing the coupled electro-chemo-mechanical behavior occurring in the lithium anode,cathode,SSEs,and beyond.

关键词： advanced characterization techniques chemo-mechanical effects interface

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An intelligent DNA nanodevice for precision thrombus therapy

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Science China Chemistry 2024年第10期67卷 3195-3197页

作者： Yihao Zhou Qiangbin Wang CAS Key Laboratory of nano-Bio Interface Division of Nanobiomedicine and i-LabSuzhou Instiute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Obstruction of blood vessels(thrombosis)due to blood clots is one of the main causes of death worldwide and is associated with many cardiovascular diseases,such as myocardial infarction,ischemic stroke,and pulmonary embolism[1].Thrombolytic therapy is currently the preferred treatment for acute thrombosis and is administered intravenously with thrombolytic drugs,such as tissue plasminogen activator(tPA)[2].

关键词： drugs cardiovascular acute

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