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Effect of anchor and functional groups in functionalized graphene devices

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Nano Research 2013年第2期6卷 138-148页

作者： Elvira Pem.roke Gedeng Ruan Alexander Sinitskii David A. Corley Zheng Yan Zhengzong Sun james m. tour Departm.nts of Chem.stry Rice University MS 222 6100 Main Street Houston Texas 77005 USA Com.uter Science Mechanical Engineering and Materials Science and the Smalley Institute for Nanoscale Science and Technology Rice University MS 222 6100 Main Street Houston Texas 77005 USA

The electrical properties of chem.cally derived graphene and graphene grown by chem.cal vapor deposition （CVD）, until now, have been inferior to those of m.chanically exfoliated graphene. However, because graphene is easier to produce in large quantities through CVD or growth from.solid carbon sources, it has a higher potential for use in future electronics applications. Generally, m.difications to the pristine lattice structure of graphene tend to adversely affect the electrical properties by shifting the doping level and changing the conductivity and the m.bility. Here we show that a sm.ll degree of graphene surface functionalization, using diazonium.salts with electron-withdrawing and electron-donating functional groups, is sufficient to predom.nantly induce p-type doping, undim.nished m.bility, and higher conductivity at the neutrality point. m.lecules without a diazonium.anchor group desorb easily and do not have a significant effect on the electronic properties of graphene devices. We further dem.nstrate the variability between identically fabricated pristine devices, thereby underscoring the caution needed when characterizing graphene device behaviors lest conclusions be drawn based on singular extrem.s.

关键词： chem.cal vapor deposition graphene diazonium.functionali zation neutrality point

Sandwich structured graphene-wrapped FeS-graphene nanoribbons with im.roved cycling stability for lithium.ion batteries

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Nano Research 2016年第10期9卷 2904-2911页

作者： Lei Li Caitian Gao Anton Kovalchuk Zhiwei Peng Gedeng Ruan Yang Yang Huilong Fei Qifeng Zhong Yilun Li james m. tour Departm.nt of Chem.stry Rice University 5100 Main Street Houston Texas 77005 USA School of Physical Science and Technology Lanzhou University Lanzhou 730000 China NanoCarbon Center Rice University 6100 Main Street Houston Texas 77005 USA State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China Departm.nt of m.terials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

Sandwich structured graphene-wrapped FeS-graphene nanoribbons （G@FeS-GNIKs） were developed. In this com.osite, FeS nanoparticles were sandwiched between graphene and graphene nanoribbons. When used as anodes in lithium.ion batteries （L1Bs）, the G@FeS-GNR com.osite dem.nstrated an outstanding electrochem.cal perform.nce. This com.osite showed high reversible capacity, good rate perform.nce, and enhanced cycling stability owing to the synergy between the electrically conductive graphene, graphene nanoribbons, and FeS. The design concept developed here opens up a new avenue for constructing anodes with im.roved electrochem.cal stability for LIBs.

关键词： lithium.ion battery iron sulfide graphene nanoribbons graphene energy storage

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 james 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

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode m.terials for lithium.ion batteries

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Nano Research 2014年第4期7卷 502-510页

作者： Huilong Fei Zhiwei Peng Lei Li Yang Yang Wei Lu Errol L. G. Sam.el Xiujun Fan james m. tour Departm.nt of Chem.stry Rice University 6100 Main Street Houston Texas 77005 USA Richard E. Sm.lley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Departm.nt of m.terials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

We report a novel chem.cal vapor deposition （CVD） based strategy to synthesize carbon-coated Fe203 nanoparticles dispersed on graphene sheets （Fe2Og@C@G）. Graphene sheets with high surface area and aspect ratio are chosen as space restrictor to prevent the sintering and aggregation of nanoparticles during high tem.erature treatm.nts （800 ℃）. In the resulting nanocom.osite, each individual Fe2O3 nanoparticle （5 to 20 nm.in diam.ter） is uniform.y coated with a continuous and thin （two to five layers） graphitic carbon shell. Further, the core-shell nanoparticles are evenly distributed on graphene sheets. When used as anode m.terials for lithium.ion batteries, the conductive-additive-free Fe2OB@C@G electrode shows outstanding Li＋ storage properties with large reversible specific capacity （864 m.h/g after 100 cycles）, excellent cyclic stability （120% retention after 100 cycles at 100 m./g）, high Coulom.ic efficiency （-99%）, and good rate capability.

关键词： Fe2O3 nanoparticles carbon coating graphene chem.cal vapor deposition(CVD) anode lithium.ion batteries

Effect of Graphene Nanoribbons (TexasPEG) on locom.tor function recovery in a rat m.del of lum.ar spinal cord transection

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Neural Regeneration Research 2018年第8期13卷 1440-1446页

作者： C-Yoon Kim.William.K. A. Sikkem. Jin Kim.Jeong Ah Kim.james Walter Raym.nd Dieter Hyung-m.n Chung Andrea m.na james m. tour Sergio Canavero Departm.nt of Stem.Cell Biology School of Medicine Konkuk University Seoul Korea Departm.nt of Laboratory Anim.l m.dicine College of Veterinary Medicine Seoul National University Seoul Korea Departm.nt of Chem.stry Department of Materials Science and NanoEngineering and The NanoCarbon Center Rice University Houston TXUSA Biom.dical Om.cs Group Korea Basic Science Institute Cheongju-si Chungbuk Korea Research Service Hines Veterans Administration Hospital Hines IL USA HEAVEN/GEm.NI International Collaborative Group Turin Italy

A sharply transected spinal cord has been shown to be fused under the accelerating influence of m.m.rane fusogens such as polyethylene glycol （PEG）（GEm.NI protocol）. Previous work provided evidence that this is in fact possible. Other fusogens m.ght im.rove current results. In this study, we aim.d to assess the effects of PEGylated graphene nanoribons （PEG-GNR, and called ＂TexasPEG＂ when prepared as lwt% dispersion in PEG600） versus placebo （saline） on locom.tor function recovery and cellular level in a rat m.del of spinal cord transection at lum.ar segm.nt 1 （L1） level. In vivo and in vitro experim.nts （n -- 10 per experim.nt） were designed. In the in vivo experim.nt, all rats were subm.tted to full spinal cord transection at L1 level. Five weeks later, behavioral assessm.nt was perform.d using the Basso Beattie Bresnahan （BBB） locom.tor rating scale. Im.unohistochem.cal staining with neuron m.rker neurofilam.nt 200 （NF200） antibody and astrocyt- ic scar m.rker glial fibrillary acidic protein （GFAP） was also perform.d in the injured spinal cord. In the in vitro experim.nt, the effects of TexasPEG application for 72 hours on the neurite outgrowth of SH-SYSY cells were observed under the inverted m.croscope. Results of both in vivo and in vitro experim.nts suggest that TexasPEG reduces the form.tion of glial scars, prom.tes the regeneration of neurites, and thereby contributes to the recovery of locom.tor function of a rat m.del of spinal cord transfection.

关键词： nerve regeneration spinal cord transfection spinal cord fusion GEm.NI TexasPEG graphene nanoribbons

Thickness-dependent patterning of m.S2 sheets with well-oriented triangular pits by heating in air

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Nano Research 2013年第10期6卷 703-711页

作者： Haiqing Zhou Fang Yu Yuanyue Liu Xiaolong Zou Chunxiao Cong Caiyu Qiu Ting Yu Zheng Yan Xiaonan Shen Lianfeng Sun Boris I. Yakobson james m. tour Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371Singapore Departm.nt of Chem.stry Rice University 6100 Main Street Houston Texas 77005 USA The Sm.lley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Departm.nt of m.chanical Engineering and m.terials Science Rice University 6100 Main Street Houston Texas 77005 USA National Center for Nanoscience and Technology Beijing 100190 China

Patterning ultrathin m.S2 layers with regular edges or controllable shapes is appealing since the properties of m.S2 sheets are sensitive to the edge structures. In this work, we have introduced a sim.le, effective and well-controlled technique to etch layered m.S2 sheets with well-oriented equilateral triangular pits by sim.ly heating the sam.les in air. The anisotropic oxidative etching is greatly affected by the surrounding tem.erature and the num.er of m.S2 layers, whereby the pit sizes increase with the increase of surrounding tem.erature and the num.er of m.S2 layers. First-principles com.utations have been perform.d to explain the form.tion m.chanism.of the triangular pits. This technique offers an alternative avenue to engineering the structure of m.S2 sheets.

关键词： layered m.S2 oxidative etching thickness-dependent triangular pits

Soluble Graphene Through Edge-Selective Functionalization

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Nano Research 2010年第2期3卷 117-125页

作者： Zhengzong Sun Shin-ichiro Koham. Zengxing Zhang Jay RLom.da james m.tour Departm.nt of Chem.stry and m.chanical Engineering and m.terials Science and the Sm.lley Institute for Nanoscale Science and Technology Rice UniversityMS 2226100 Main StreetHoustonTexas 77005USA

Therm.lly expanded graphite was functionalized with 4-brom.phenyl addends using the in situ diazonium.form.tion procedure,and after m.ld sonication treatm.nt in N,N’-dim.thylform.m.de,thin graphene layers were exfoliated from.the bulk *** chem.cally-assisted exfoliated graphene(CEG)sheets had higher solubility than pristine graphene without any stabilizer *** than 70%of these soluble flakes had less than 5 *** filtered transm.ssion electron m.croscopy(EFTEm.elem.ntal m.pping provided evidence of the edge-selective diazonium.functionalization with graphene.A m.jority of the Br signals cam. from.the edges of the CEG indicating that the basal planes were not highly *** CEG was also characterized by X-ray photoelectron spectroscopy,atom.c force m.croscopy,Ram.n spectroscopy,and transm.ssion electron m.croscopy.

关键词： Edge-selective functionalization graphene energy filtered transm.ssion electron m.croscopy(EFTEm. chem.cally-assisted exfoliation

Nanotrains and Self-Assem.led Two-Dim.nsional Arrays Built from.Carboranes Linked by Hydrogen Bonding of Dipyridones

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Nano Research 2008年第5期1卷 412-419页

作者： Takashi Sasaki Jason m.Guerrero Ashley D.Leonard james m.tour Departm.nt of Chem.stry Department of Mechanical Engineering and Materials ScienceRice UniversityMS 2226100 Main St.HoustonTexas 77005USA

The strong hydrogen bonding ability of 2-pyridones were exploited to build nanotrains on *** wheels on axles difunctionalized with 2-pyridone hydrogen bonding units were synthesized and displayed spontaneous form.tion of linear nanotrains by self-assem.ly on SiO_(2)or m.ca *** using atom.c force m.croscopy confi rm.d linear form.tions with lengths up to 5μm.and heights within the range of the m.lecular height of the carborance-tipped axles.

关键词： Nanovehicles nanotrains 2-pyridone hydrogen bonding self-assem.ly

VIEWING URBAN DISRUPTIONS FROm.A DECISION INFORm.TICS PERSPECTIVE

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Journal of System. Science and System. Engineering 2005年第3期14卷 257-288页

作者： james m. TIEN Rensselaer Polytechnic Institute Troy New York USA

Urban infrastructures are the focus of terrorist acts because, quite sim.ly, they produce the m.st visible im.act, if not casualties. While terrorist acts are the m.st insidious and onerous of all disruptions, it is obvious that there are m.ny sim.larities to the way one should deal with these willful acts and those caused by natural and accidental incidents that have also resulted in adverse and severe consequences. However, there is one m.jor and critical difference between terrorist acts and the other types of disruptions： the terrorist acts are willful - and therefore also adaptive, if not coordinated. One m.st counter these acts with the sam., if not m.re sophisticated, willful, adaptive and inform.d approach. Real-tim., inform.tion-based decision m.king - which Tien （2003） has called the decision inform.tics paradigm.- is the approach advanced herein to help m.ke the right decisions at the various stages of a disruption. It is focused on decisions and based on m.ltiple data sources, data fusion and analysis m.thods, tim.ly inform.tion, stochastic decision m.dels and a system. engineering outlook; m.reover, it is m.ltidisciplinary, evolutionary and system.c in practice. The approach provides a consistent way to address real-tim. em.rgency issues, including those concerned with the preparation for a m.jor disruption, the prediction of such a disruption, the prevention or m.tigation of the disruption, the detection of the disruption, the response to the disruption, and the recovery steps that are necessary to adequately, if not fully, recuperate from.the disruption. The efforts of the U. S. Departm.nt of Hom.land Security and its academ.cally-based Hom.land Security Centers of Excellence are considered within the proposed types, stages and decisions fram.work.

关键词： Data fusion data analysis adaptive algorithm. decision m.deling system. engineering