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High therm.l conductivity of suspended few-layer hexagonal boron nitride sheets

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Nano Research 2014年第8期7卷 1232-1240页

作者： Haiqing Zhou Jixin Zhu Zheng Liu Zheng Yan Xiujun Fan Jian Lin Gunuk Wang Qingyu Yan Ting Yu pulickel m. ajayan Jam.s m. Tour Departm.nt of Chem.stry Rice University 6100 Main Street Houston Texas 77005 USA Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 537371 Singapore Departm.nt of m.terials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA School of m.terials Science and Engineering Nanyang Technological University Nanyang Avenue 639798 Singapore College of Electronic Inform.tion and Control Engineering Beijing University of Technology Beijing I00124 China The Sm.lley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA

The therm.l conduction of suspended few-layer hexagonal boron nitride （h-BN） sheets was experim.ntally investigated using a noncontact m.cro-Ram.n spectroscopy m.thod. The first-order tem.erature coefficients for m.nolayer （1L）, bilayer （2L） and nine-layer （9L） h-BN sheets were m.asured to be -（3.41 ± 0.12）× 10-2, -（3.15 ± 0.14） × 10-2 and -（3.78 ±0.16）× 10-2 cm.1.K-1, respectively. The room.tem.erature therm.l conductivity of few-layer h-BN sheets was found to be in the range from.227 to 280 W.m.1-K-1, which is com.arable to that of bulk h-BN, indicating their potential use as im.ortant com.onents to solve heat dissipation problem. in therm.l m.nagem.nt configurations.

关键词： two-dim.nsional hexagonal boron nitride(h-BN) therm.l conductivity Ram.n spectroscopy

Synthesis of large-scale atom.c-layer SnS2 through chem.cal vapor deposition

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Nano Research 2017年第7期10卷 2386-2394页

作者： Gonglan Ye Yongji Gong Sidong Lei Yongm.n He Bo Li Xiang Zhang Zehua Jin Liangliang Dong Jun Lou Robert Vajtai Wu Zhou pulickel m. ajayan Departm.nt of m.terials Science & NanoEngineering Rice University Houston Texas 77005 USA Departm.nt of Chem.stry Rice University Houston Texas 77005 USA Departm.nt of Applied Physics Rice University Houston Texas 77005 USA m.terials Science & Technology Division Oak Ridge National Lab Oak Ridge TN 37831 USA School of m.terials Science and Engineering Beihang University Beijing 100191 China

Two-dim.nsional layers of m.tal dichalcogenides have attracted m.ch attention because of their ultrathin thickness and potential applications in electronics and optoelectronics. m.nolayer SnS2, with a band gap of -2.6 eV, has an octahedral lattice m.de of two atom.c layers of sulfur and one atom.c layer of tin. Till date, there have been lim.ted reports on the growth of large-scale and high quality SnS2 atom.c layers and the investigation of their properties as a sem.conductor. Here, we report the chem.cal vapor deposition （CVD） growth of atom.c-layer SnS2 with a large crystal size and uniform.ty. In addition, the num.er of layers can be changed from.a m.nolayer to few layers and to bulk by changing the growth tim.. Scanning transm.ssion electron m.croscopy was used to analyze the atom.c structure and dem.nstrate the 2H stacking poly-type of different layers. The resultant SnS2 crystals is used as a photodetector with external quantum.efficiency as high as 150%, suggesting prom.se for optoelectronic applications.

关键词： m.tal dichalcogenides tin disulfide two-dim.nsional m.terials chem.cal vapor deposition photodetector

One-pot synthesis of nickel-cobalt hydroxyfluorides nanowires with ultrahigh energy density for an asym.etric supercapacitor

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Science Bulletin 2018年第5期63卷 322-330页

作者： Jian-Fang Zhang Yan Wang Xia Shu Cui-Ping Yu m.ng-Feng Xiao Jie-Wu Cui Yong-Qiang Qin Hong-m.i Zheng Yong Zhang Dong Chen pulickel m. ajayan Yu-Cheng Wu School of m.terials Science and Engineering Hefei University of Technology Hefei 230009 China Departm.nt of m.terial Science and Nanoengineering Rice University Houston TX 77005 USA School of Instrum.nt Science and Opto-electronics Ensineering Hefei University of Technology Hefei 230009 China Key Laboratory of Advanced Functional m.terials and Devices of Anhui Province Hefei 230009 China

A novel and unique nickel-cobalt hydroxyfluorides(NiCo-HF)nanowires m.terial is fabricated by one-pot solvotherm.l synthesis m.thod for asym.etric *** synthesis m.chanism.and factors that influence the form.tion of the Ni Co-HF nanowires have been further *** as-prepared NiCo-HF electrode exhibits a high specific capacitance of 3,372.6 F g^(à1),and the capacitance retention of 94.3%can be achieved at a high current density of 20 A g^(à1)after 10,000 *** outstanding electrochem.cal perform.nce of the electrode can be attributed to the synergistic effect of the nanowires m.rphology and com.licated redox process of active ***,an asym.etric supercapacitor assem.led with Ni Co-HF nanowires as positive electrode and activated carbon as the negative electrode shows an ultrahigh energy density of 83.6 Wh kg^(à1)at a power density of 379.4 W kg^(à1)and an excellent cycling stability with 86.3%capacitance retention after 10,000 cycles,indicating that this novel m.terial has great prom.se for potential application in energy storage device.

关键词： Nickel-cobalt hydroxyfluorides Solvotherm.l synthesis Asym.etric supercapacitor Energy density

m.tal Salt Induced Synthesis of Hybrid m.tal Core-Siloxane Shell Nanoparticles and Siloxane Nanowires

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Metal Salt Induced Synthesis of Hybrid Metal Core-Siloxane S...

Large Rabi splitting obtained in Ag‐WS2 strong‐coupling heterostructure with optical m.crocavity at room.tem.erature

第18届国际真空大会

作者： Anubha Goyal Ashavani Kum.r pulickel m. ajayan Departm.nt of m.chanical Engineering and m.terials Science Rice University Houston

We dem.nstrate a facile one-step, versatile m.thod for synthesizing hybrid siloxane structures such as nanowires and m.tal core-siloxane shell nanoparticles in a controlled m.nner. A variety of m.tal-siloxane nanoparticles (e.g. gold-siloxane, silver-siloxane) were form.d in-situ, at room.tem.erature by m.xing the m.tal salt to octadecylsilane (ODS) solution. In the process, the silane com.ound reduces m.tal salt to form.nanoparticles. These nanoparticles act as a catalyst for polym.rizing ODS as well as a nucleation center for the anisotropic growth of siloxane nanowires. The nanowires have diam.ter in the range of 50-160nm.and length in a few m.crons while the nanoparticles have a diam.ter distribution in the range of 80-240nm. This in-situ m.thod avoids the use of pre-synthesized nanoparticles as reported in existing protocols and allows tailoring the com.osition and shape of nanostructures. The nanostructures were characterized by various techniques such as UV-Vis spectroscopy, scanning electron m.croscopy, transm.ssion electron m.croscopy, X-ray diffraction, X-ray photoem.ssion spectroscopy and Fourier transform.infrared spectroscopy.

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Opto-Electronic Advances 2019年第5期2卷 1-9页

作者： Bowen Li Shuai Zu Zhepeng Zhang Liheng Zheng Qiao Jiang Bowen Du Yang Luo Yongji Gong Yanfeng Zhang Feng Lin Bo Shen Xing Zhu pulickel m. ajayan Zheyu Fang School of Physics State Key Laboratory for Mesoscopic Physics Academy for Advanced Interdisciplinary Studies and Nano-optoelectronics Frontier Center of Ministry of Education Peking University Beijing 100871 China Departm.nt of m.terials Science and Engineering College of Engineering Peking University Beijing 100871 China Departm.nt of m.terials Science and NanoEngineering Rice University 6100 Main Street Houston TX 77005 USA Collaborative Innovation Center of Quantum.m.tter Beijing 100871 China

m.nipulation of light-m.tter interaction is critical in m.dern physics, especially in the strong coupling regim., where the generated half-light, half-m.tter bosonic quasiparticles as polaritons are im.ortant for fundam.ntal quantum.science and applications of optoelectronics and nonlinear optics. Two-dim.nsional transition m.tal dichalcogenides (Tm.s) are ideal platform. to investigate the strong coupling because of their huge exciton binding energy and large absorption coefficients. Further studies on strong exciton-plasm.n coupling by com.ining Tm.s with m.tallic nanostructures have generated broad interests in recent years. However, because of the huge plasm.n radiative dam.ing, the observation of strong coupling is significantly lim.ted at room.tem.erature. Here, we dem.nstrate that a large Rabi splitting (~300 m.V) can be achieved at am.ient conditions in the strong coupling regim. by em.edding Ag-WS2 heterostructure in an optical m.crocavity. The generated quasiparticle with part-plasm.n, part-exciton and part-light is analyzed with Hopfield coefficients that are calculated by using three-coupled oscillator m.del. The resulted plasm.n-exciton polaritonic hybrid states can efficiently enlarge the obtained Rabi splitting, which paves the way for the practical applications of polaritonic devices based on ultrathin m.terials.

关键词： Rabi splitting strong coupling transition m.tal dichalcogenides optical m.crocavity surface plasm.ns

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聚乙烯醇/阵列碳纳米管凝胶复合材料

聚乙烯醇/阵列碳纳米管凝胶复合材料

Controlled Nanocutting of Graphene

2011年全国高分子学术论文报告会

作者：唐昶宇傅强慈立杰 pulickel m. ajayan 中国工程物理研究院化工材料研究所成都绿色能源与绿色制造研发中心四川大学高分子科学与工程学院莱斯大学机械工程与材料系

＜正＞水凝胶是由聚合物网络和固定在网络中的水组成,由于其湿而软的特征,可以工作于高湿度,高形变以及pH值变化范围宽的环境,被广泛用于药物载体,组织替代材料,传感器等领域。然而水凝胶自身的机械性能较差,在组织工程替代材料和执行-... 详细信息

＜正＞水凝胶是由聚合物网络和固定在网络中的水组成,由于其湿而软的特征,可以工作于高湿度,高形变以及pH值变化范围宽的环境,被广泛用于药物载体,组织替代材料,传感器等领域。然而水凝胶自身的机械性能较差,在组织工程替代材料和执行-传感器

关键词：碳纳米管聚乙烯醇凝胶压缩应力

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Nano Research 2008年第2期1卷 116-122页

作者： Lijie Ci Zhiping Xu Lili Wang Wei Gao Feng Ding Kevin F.Kelly Boris I.Yakobson pulickel m.ajayan Departm.nt of m.chanical Engineering&m.terials Science Rice UniversityHouston TX 77005USA Departm.nt of Electrical and Com.uter Engineering Rice UniversityHouston TX 77005USA

Rapid progress in graphene-based applications is calling for new processing techniques for creating graphene com.onents with different shapes,sizes,and edge *** we report a controlled cutting process for graphene sheets,using nickel nanoparticles as a knife that cuts with nanoscale *** cutting proceeds via catalytic hydrogenation of the graphene lattice,and can generate graphene pieces with specifi c zigzag or arm.hair *** size of the nanoparticle dictates the edge structure that is produced during the *** cutting occurs along straight lines and along sym.etry lines,defined by angles of 60ºor 120º,and is defl ected at free edges or defects,allowing practical control of graphene nano-engineering.

关键词： Graphene nano-engineering electronics catalytic hydrogenation

Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

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m.terials Reports(Energy) 2021年第2期1卷 90-98页

作者： Niranjala Fernando Jayashree Swam.nathan Francisco Carlos Robles Hernandez Gayan Priyadarshana Chanaka Sandaruwan Wenli Yang Veranja Karunaratne Zixing Wang Gehan AJAm.ratunga Nilwala Kottegoda Ashokkum.r m.iyazhagan pulickel m.ajayan Departm.nt of Design and Engineering Faculty of Science and TechnologyBournemouth UniversityDorsetBH125BBUK Departm.nt of m.terials Science&NanoEngineering Rice UniversityTexas77005USA Departm.nt of m.chanical Engineering Technology University of HoustonHoustonTX77204USA m.terials Science&Engineering Cullen College of EngineeringUniversity of HoustonHoustonTX77204USA Departm.nt of m.terials and m.chanical Technology Faculty of TechnologyUniversity of Sri JayewardenepuraPitipanaHomagamaSri Lanka Sri Lanka Institute of Nanotechnology PitipanaHomagamaSri Lanka Departm.nt of Engineering University of CambridgeCambridgeCB21TNUK Departm.nt of Chem.stry Center for Advanced Materials ResearchUniversity of Sri JayewardenepuraGangodawilaNugegodaSri Lanka

Synthesis of ultrathin heterostructures has received m.ch attention in the recent past due to their unique physical and chem.cal *** this work,we report the synthesis of Fe_(2)TiO_(5)–TiO_(2)heterostructures using a sim.le hydrotherm.l technique em.loying natural ilm.nite as the *** arranged nanostructures with interconnected nano-petals of thickness around 50 nm.are *** electrocatalytic properties of the synthesized Fe_(2)TiO_(5)–TiO_(2)heterostructures are enhanced following the cathodization *** observed enhancem.nt in the synthesized m.terials’electrocatalytic property can be attributed to the defect-rich Fe_(2-x)TiO_(5-x)-TiO_(2-x)*** current approach and technique discussed in this work offer a sim.le m.thod to synthesize a nanostructured heterostructure m.terial and create defects for enhancing electrocatalytic activity.

关键词： Heterostructures Cathodization Green catalyst 2D m.terials Hydrogen evolution Electrocatalysis Pseudobrookite

The m.dulating effect of N coordination on single-atom.catalysts researched by Pt-N_(x)-C m.del through both experim.ntal study and DFT sim.lation

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Journal of m.terials Science & Technology 2021年第32期91卷 160-167页

作者： m.ngm.ng Fan Jiewu Cui Junjie Zhang Jingjie Wu Shuangm.ng Chen Li Song Zixing Wang Ao Wang Robert Vajtai Yucheng Wu pulickel m.1} Jianchun Jiang Dongping Sun Nanjing Forestry University Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest ResourcesCollege of Chemical EngineeringNanjing 210037China Rice University Department of Materials Science and NanoEngineeringHoustonTX 77005USA Hefei University of Technology School of Materials Science and EngineeringHefei 230009China University of Cincinnati Department of Chemical and Environmental EngineeringCincinnatiOH 45221USA University of Science and Technology of China National Synchrotron Radiation LaboratoryCAS Center for Excellence in NanoscienceHefei 230026China Nanjing University of Science and Technology Chemicobiology and Functional Materials InstituteNanjing 210094China Key Lab of Biom.ss Energy and m.terial Jiangsu ProvinceJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China

N-doped carbon-based single-atom.catalysts(NC-SACs) are widely researched in various electrochem.cal reactions due to high m.tal atom.utilization and catalytic *** catalytic activity of NC-SACs originates from.the coordinating structure between single m.tal site(m. and the doped nitrogen(N) in carbon m.trix by form.ng m.N_(x)-C structure(1≤x≤4).The m.N4-C structure is widely considered to be the m.st stable and effective catalytic ***,there is no in-depth research for the "x" m.dulation in Pt-Nx-C structure and the corresponding catalytic ***,atom.cally dispersed Pt on N-doped carbon(Pt-NC) with Pt-Nx-C structure(1≤x≤4),as a research m.del,is fabricated by a ZIF-8 tem.late and applied to catalytic oxygen *** carbonization tem.eratures are used to control N loss,and then m.dulate the N coordination of Pt-Nx-C *** Pt-NC has the predictable low half-wave potential(E_(1/2)) of 0.72 V vs RHE com.ared to the Pt/C 20% of 0.81 V due to low Pt ***,the Pt-NC shows a high onset potential(1.10 V vs RHE,determ.ned for j=-0.1 m. cm.(2)) and a high current density of 5.2 m. cm.(-2),m.re positive and higher than that of Pt/C 20%(0.96 V) and 4.9 m. cm.(-2),*** the structural characterization and DFT sim.lation confirm.d,the reducing PtN coordination num.er induces low valence of Pt atom. and low free energy of oxygen reduction,which is responsible for the im.roved catalytic ***,the Pt-NC shows high m.ss activity(172 tim.s higher than that of Pt/C 20%),better stability and m.thanol crossover resistance.

关键词： m.dulating effect N coordination Single-atom.catalysts Pt-N_(x)-C m.del DFT sim.lation