检索结果-南通市图书馆

liquid-phase exfoliation of violet phosphorus for electronic applications

在线全文

学校读者我要写书评

暂无评论

SmartMat 2021年第2期2卷 226-233页

作者： Shenghuang Lin Wai Kin Lai Yanyong Li Wei Lu Gongxun Bai Shu Ping Lau Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongChina Songshan Lake Materials Laboratory Songshan Lake International Innovation Entrepreneurship CommunityDongguan CityGuangdongChina Institute of Optoelectronic Materials and Devices China Jiliang UniversityHangzhouChina

Large-scale production of two-dimensional(2D)materials still is a crucial point toward its practical applications.Violet phosphorus(VP)with a wide bandgap accelerates and broadens the potential applications of elemental phosphorus in optoelectronics.Here,we demonstrate the scalable production of solution-processable violet phosphorus flakes stably dispersed in several solvents.The exfoliated VP flakes exhibit thickness-dependent visible photoluminescence characteristics,which covers the shortcoming of black phosphorus.Meanwhile,the VP-based field-effect transistor reveals relatively competitive electrical properties to other liquid-phase exfoliated 2D materials.Our study paves the way for a wide range of applications of optical devices,energy storage,catalysis,and sodium batteries based on large-scale VP flakes.

关键词： field effect transistor liquid-phase exfoliation photoluminescence violet phosphorus

Ultraviolet Photodetector based on Sr_(2)Nb_(3)O_(10) Perovskite Nanosheets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 282-287页

作者：张斌斌 JIA Mengmeng LIANG Qi WU Jinsong ZHAI Junyi 李宝文 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijin 100083China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

liquid-phase exfoliation was employed to synthesize Sr_(2)Nb_(3)O_(10) perovskite nanosheets with thicknesses down to 1.76 nm.Transmission electron microscopy(TEM),atomic force microscope(AFM),X-ray photoelectron spectrometer(XPS),and other characterization techniques were used to evaluate the atomic structure and chemical composition of the exfoliated nanosheets.A UV photodetector based on individual Sr_(2)Nb_(3)O_(10) nanosheets was prepared to demonstrate the application of an ultraviolet(UV) photodetector.The UV photodetector exhibited outstanding photocurrent and responsivity with a responsivity of 3×10^(5) A·W^(-1) at 5 V bias under 280 nm illumination,a photocurrent of 60 nA,and an on/off ratio of 3×10^(2).

关键词： perovskite nanosheets liquid-phase exfoliation ultraviolet photodetector

Activation of 2D MoS_(2) electrodes induced by high-rate lithiation processes

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第3期78卷 56-70,I0003页

作者： Tianzhu Liu Georgian Melinte Oleksandr Dolotko Michael Knapp Beatriz Mendoza-Sánchez Institute for Applied Materials-Energy Storage Systems(IAM-ESS) Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen D-76344Germany Karlsruhe Nano Micro Facility(KNMF) Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen D-76344Germany Helmholtz-Institute Ulm for Electrochemical Energy Storage(HIU) Ulm 89081Germany

MoS_(2) is a highly promising material for application in lithium-ion battery anodes due to its high theoretical capacity and low cost.However,problems with a fast capacity decay over cycling,especially at the first cycles,and poor rate performance have deterred its practical implementation.Herein,electrodes comprised solely of few-layers 2D MoS_(2) nanosheets have been manufactured by scalable liquid-phase exfoliation and spray deposition methods.The long-standing controversy questioning the reversibility of conversion processes of MoS_(2)-based electrodes was addressed.Raman studies revealed that,in 2D MoS_(2) electrodes,conversion processes are indeed reversible,where nanostructure played a key role.Cycling of the electrodes at high current rates revealed an intriguing phenomenon consisting of a continuously increasing capacity after ca.100-200 cycles.This phenomenon was comprehensively addressed by a variety of electrochemical and microscopy methods that revealed underlying physical activation mechanisms that involved a range of profound electrode structural changes.Activation mechanisms delivered a capacitive electrode of a superior rate performance and cycling stability,as compared to the corresponding pristine electrodes,and to MoS_(2) electrodes previously reported.Herein,we have devised a methodology to overcome the problem of cycling stability of 2D MoS_(2) electrodes.Moreover,activation of electrodes constitutes a methodology that could be applied to enhance the energy storage performance of electrodes based on other 2D nanomaterials,or combinations thereof,strategically combining chemistries to engineer electrodes of superior energy storage properties.

关键词： 2D MoS_(2) liquid-phase exfoliation Spray-deposition Conversion processes Activation mechanisms Energy storage mechanisms

Intercalation assisted liquid phase production of disulfide zirconium nanosheets for efficient electrocatalytic dinitrogen reduction to ammonia

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2023年第4期8卷 1174-1184页

作者： Yangshuo Li Huiyong Wang Bing Chang Yingying Guo Zhiyong Li Shamraiz Hussain Talib Zhansheng Lu Jianji Wang Henan Key Laboratory of Green Chemistry Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsKey Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiangHenan453007China School of Environment Henan Key Laboratory for Environmental Pollution ControlKey Laboratory for Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiangHenan453007China School of Physics Henan Normal UniversityXinxiangHenan453007China

Disulfide zirconium(ZrS_(2)) is a two-dimensional(2D) transition metal disulfide and has given rise to extensive attention because of its distinctive electronic structure and properties.However,mass production of high quality of ZrS_(2)nanosheets to realize their practical application remains a challenge.Here,we have successfully exfoliated the bulk ZrS_(2)powder with the thickness of micron into single and few-layer nanosheets through liquid-phase exfoliation in N-methylpyrrolidone(NMP) assisted via aliphatic amines as intercalators.It is found that the exfoliation yield is as high as 27.3%,which is the record value for the exfoliation of ZrS_(2)nanosheets from bulk ZrS_(2)powder,and 77.1% of ZrS_(2)nanosheets are 2-3 layers.The molecular geometric size and aliphatic amine basicity have important impact on the exfoliation.Furthermore,the ZrS_(2)nanosheets have been used as catalyst in the electrocatalytic dinitrogen reduction with the NH3yield of 57.75 μg h^(-1)mg_(cat.)^(-1),which is twice that by ZrS_(2)nanofibers reported in literature and three times that by the bulk ZrS_(2)powder.Therefore,the liquid phase exfoliation strategy reported here has great potential in mass production of ZrS_(2)nanosheets for high activity electrocatalysis.

关键词： Disulfide zirconium liquid-phase exfoliation Aliphatic amines Electrocatalytic dinitrogen reduction Ammonia

High-concentration dispersions of exfoliated MoS2 sheets stabilized by freeze-dried silk fibroin powder

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第6期9卷 1709-1722页

作者： HeungBo Sim JiYong Lee Byeongho Park Sun Jun Kirn Shinill Kang ,WonHyoung Ryu Seong Chan Jun School of Mechanical Engineering Yonsei University Seoul 120-749 Republic of Korea

liquid-phase exfoliation （LPE） is an attractive method for the scaling-up of exfoliated MoS2 sheets compared to chemical vapor deposition and mechanical cleavage. However, the MoS2 nanosheet yield from LPE is too small for practical applications. We report a facile method for the scaling-up of exfoliated MoS2 nanosheets using freeze-dried silk fibroin powders. Compared to MoS2 dispersion in the absence of silk fibroin powder, sonicated MoS2 dispersions with silk fibroin powder （MoSJSilk dispersion） show noticeably higher exfoliated MoS2 nanosheet yields, with suspended MoS2 concentrations in MoS2/Silk dispersions sonicated for 2 and 5 h of 1.03 and 1.39 mg.mL-1, respectively. The MoS2 concentration in the MoS2/Silk dispersion after centrifugation above 10,000 rpm is more than four times that without the silk fibroin. The size of the dispersed silk fibroin is controlled by the change of centrifugation rate, showing the removal of silk fibroin above tens of micrometers in size after centrifugation at 2,000 rpm. Size-controlled silk fibroin biomolecules combined with MoS2 nanosheets are expected to increase the practical use of such materials in fields related to tissue engineering, biosensors and electrochemical electrodes. Atomic force microscopy and Raman spectroscopy provide the height of the MoS2 nanosheets spin-cast from MoS2/Silk dispersions, showing thicknesses of 3--6 nm. X-ray photoelectron spectroscopy and X-ray diffraction indicate that the outermost surface layer of the hydrophobic MoS2 crystals interact with oxygen-containing functional groups that exist in the hydrophobic part of silk fibroins. The amphiphilic properties of silk fibroin combined with the MoS2 nanosheets stabilize dispersions by enhancing solvent-material interactions. The large quantities of exfoliated MoS2 nanosheets suspended in the as-synthesized dispersions can be utilized for the fabrication of vapor and electrochemical devices requiring high MoS2 nanosheets contents.

关键词： MoS2 nanosheet liquid-phase exfoliation freeze-dried silk fibroin powder amount of suspended MoB2 sheet stabilized dispersion

Intercalation-assisted exfoliation Strategy for Two-dimensional Materials Preparation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第4期36卷 518-524页

作者： ZHAO Yingchcng SU Yucqi GUO Yuqiao WU Changzheng Hefei National Laboratory for Physical Sciences at the Microscale iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)CAS Key LMboratoty of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei 230026P.R.China

Controlled large-quantity synthesis of two-dimensional materials is vital for the research on their physical and chemical characters and potential applications.Utilizing structural features of layered compounds,intercalation of molecules or ions can be applied to the acceleration of liquid-phase exfoliation.In this review,we aim at recent progress on synthesis of two-dimensional materials via intercalation-assisted exfoliation strategy.Works on wet chemical intercalation and electrochemical intercalation,together with product exfoliation afterwards,are summarized.Furthermore,the features and advantages of intercalation-assisted exfoliation strategy for two-dimensional materials synthesis are discussed.

关键词： Two-dimensional material liquid-phase exfoliation Intercalation

exfoliation and dispersion of graphene in ethanol-water mixtures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2012年第2期6卷 176-182页

作者： Wei-Wei LIU Bao-Yu XIA Xiao-Xia WANG Jian-Nong WANG Shanghai Key Laboratory for Laser Processing and Materials Modification School of Materials Science and EngineeringShanghai Jiao Tong University800 Dong Chuan RoadShanghai 200240China School of Materials Science and Engineering Tongji University1239 Siping RoadShanghai 200092China Key Laboratory of Safety Science of Pressurized System(Ministry of Education) ScHool of Mechanical and Power EngineeringEast China University of Science and Technology130 Meilong RoadShanghai 200237China

Graphene has attracted much attention as a new nano-carbon for its unique structure and properties. However, production and dispersion of unfunctionalized graphene are still big challenges. Herein, we demonstrate a simple method for preparation and dispersion of such graphene with low cost and non toxicum. This approach is achieved by exfoliating graphite in an ethanol/water mixture and forming stable dispersion of mono- and few-layer graphenes. The ratio of ethanol/water in the mixture is found to be crucial to both the exfoliation and dispersion processes. exfoliation in pure water or pure ethanol produces no graphene. This method avoids the conventional use of harsh oxidants and surfactants; therefore, the graphitic structure is well maintained without destruction. Benefiting from the use of ethanol and water, it can be easy to prepare transparent and conductive graphene films by vacuum filtering or spray method, and does not need special post-treatment to remove the impurity, which could be beneficial for potential applications in electronic, optic and energy areas.

关键词： graphene liquid-phase exfoliation transparent conductive film solubilityparameter

VO_2(B) Nanosheets as a Cathode Material for Li-ion Battery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第6期31卷 630-633页

作者： Qiang Wang Jing Pan Ming Li Yuanyuan Luo Hao Wu Li Zhong Guanghai Li Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsChinese Academy of Sciences

VO2（B） nanosheets were prepared by a liquid-phase exfoliation from VO2（B） bulk.The lithium storage properties of VO2（B） nanosheets as capacity cathode materials for rechargeable lithium secondary batteries were investigated.It was found that the nanosheets with the thickness of several nanometers and width of tens of nanometer had a preferential growth direction along[001]orientation.By comparing with VO2（B） bulk,the VO2（B） nanosheets showed a higher initial discharge capacity and a slower capacity fading rate.The reasons for these phenomena were discussed and analyzed.

关键词： liquid-phase exfoliation VO2（B） nanosheets Li-ion