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Nanotrains and Self-Assembled Two-Dimensional 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 Department of Chemistry 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 formation of linear nanotrains by self-assembly on SiO_(2)or mica *** using atomic force microscopy confi rmed linear formations with lengths up to 5μm and heights within the range of the molecular height of the carborance-tipped axles.

关键词： Nanovehicles nanotrains 2-pyridone hydrogen bonding self-assembly

Radical Addition of Perfluorinated Alkyl Iodides to multi- Layered Graphene and Single-Walled Carbon Nanotubes

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Nano Research 2010年第2期3卷 138-145页

作者： Christopher E.Hamilton Jay R.Lomeda Zhengzong Sun james m.tour Andrew R.Barron Richard E.Smalley Institute for Nanoscale Science and Technology Department of Chemistry and Department of Mechanical Engineering and Materials ScienceRice UniversityHoustonTexas 77005USA

A simple one-pot reaction that serves to functionalize graphite nanosheets(graphene)and single-walled carbon nanotubes(SWNTs)with perfluorinated alkyl groups is *** radical addition of 1-iodo-1H,1H,2H,2H-perfluorododecane to ortho-dichlorobenzene suspensions of the carbon nanomaterial is initiated by thermal decomposition of benzoyl ***,UV photolysis of 1-iodo-perfluorodecane serves to functionalize the carbon ***-SWNTs,perfluorododecyl-graphene,and perfluorodecyl-graphene are characterized by infrared(IR)and Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),thermogravimetric analysis(TGA),and atomic force microscopy(AFm).The products show enhanced dispersability in CHCl3 as compared to unfunctionalized starting *** advantage of this one-pot functionalization procedure lies in the use of pristine graphite as starting material thereby avoiding the use of harsh oxidizing conditions.

关键词： Nanotube single-walled carbon nanotube graphene radical addition

SnO2-reduced graphene oxide nanoribbons as anodes for lithium ion batteries with enhanced cycling stability

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Nano Research 2014年第9期7卷 1319-1326页

作者： Lei Li Anton Kovalchuk james m. tour Department of Chemistry Rice University 6 I00 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

A nanocomposite material of SnO2-reduced graphene oxide nanoribbons has been developed. In this composite, the reduced graphene oxide nanoribbons are uniformly coated by nanosized SnO2 that formed a thin layer of SnO2 on the surface. When used as anodes in lithium ion batteries, the composite shows outstanding electrochemical performance with the high reversible discharge capacity of 1,027 mAh/g at 0.1 A/g after 165 cycles and 640 mAh/g at 3.0 A/g after 160 cycles with current rates varying from 0.1 to 3.0 A/g and no capacity decay after 600 cycles compared to the second cycle at a current density of 1.0 A/g. The high reversible capacity, good rate performance and excellent cycling stability of the composite are due to the synergistic combination of electrically conductive reduced graphene oxide nanoribbons and SnO2, The method developed here is practical for the large-scale development of anode materials for lithium ion batteries.

关键词： lithium ion battery tin oxide graphene oxide nanoribbons energy storage

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 Pembroke Gedeng Ruan Alexander Sinitskii David A. Corley Zheng Yan Zhengzong Sun james m. tour Departments of Chemistry Rice University MS 222 6100 Main Street Houston Texas 77005 USA Computer 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 chemically derived graphene and graphene grown by chemical vapor deposition （CVD）, until now, have been inferior to those of mechanically 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, modifications 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 mobility. Here we show that a small degree of graphene surface functionalization, using diazonium salts with electron-withdrawing and electron-donating functional groups, is sufficient to predominantly induce p-type doping, undiminished mobility, and higher conductivity at the neutrality point. molecules without a diazonium anchor group desorb easily and do not have a significant effect on the electronic properties of graphene devices. We further demonstrate the variability between identically fabricated pristine devices, thereby underscoring the caution needed when characterizing graphene device behaviors lest conclusions be drawn based on singular extremes.

关键词： chemical vapor deposition graphene diazonium functionali zation neutrality point

Sandwich structured graphene-wrapped FeS-graphene nanoribbons with improved 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 Department of Chemistry 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 Department of materials 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 composite, FeS nanoparticles were sandwiched between graphene and graphene nanoribbons. When used as anodes in lithium ion batteries （L1Bs）, the G@FeS-GNR composite demonstrated an outstanding electrochemical performance. This composite showed high reversible capacity, good rate performance, 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 improved electrochemical stability for LIBs.

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

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode materials 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. Samuel Xiujun Fan james m. tour Department of Chemistry Rice University 6100 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

We report a novel chemical 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 temperature treatments （800 ℃）. In the resulting nanocomposite, each individual Fe2O3 nanoparticle （5 to 20 nm in diameter） is uniformly 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 materials for lithium ion batteries, the conductive-additive-free Fe2OB@C@G electrode shows outstanding Li＋ storage properties with large reversible specific capacity （864 mAh/g after 100 cycles）, excellent cyclic stability （120% retention after 100 cycles at 100 mA/g）, high Coulombic efficiency （-99%）, and good rate capability.

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

Effect of Graphene Nanoribbons (TexasPEG) on locomotor function recovery in a rat model of lumbar 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. Sikkema Jin Kim Jeong Ah Kim james Walter Raymond Dieter Hyung-min Chung Andrea mana james m. tour Sergio Canavero Department of Stem Cell Biology School of Medicine Konkuk University Seoul Korea Department of Laboratory Animal medicine College of Veterinary Medicine Seoul National University Seoul Korea Department of Chemistry Department of Materials Science and NanoEngineering and The NanoCarbon Center Rice University Houston TXUSA Biomedical Omics Group Korea Basic Science Institute Cheongju-si Chungbuk Korea Research Service Hines Veterans Administration Hospital Hines IL USA HEAVEN/GEmINI International Collaborative Group Turin Italy

A sharply transected spinal cord has been shown to be fused under the accelerating influence of membrane fusogens such as polyethylene glycol （PEG）（GEmINI protocol）. Previous work provided evidence that this is in fact possible. Other fusogens might improve current results. In this study, we aimed to assess the effects of PEGylated graphene nanoribons （PEG-GNR, and called ＂TexasPEG＂ when prepared as lwt% dispersion in PEG600） versus placebo （saline） on locomotor function recovery and cellular level in a rat model of spinal cord transection at lumbar segment 1 （L1） level. In vivo and in vitro experiments （n -- 10 per experiment） were designed. In the in vivo experiment, all rats were submitted to full spinal cord transection at L1 level. Five weeks later, behavioral assessment was performed using the Basso Beattie Bresnahan （BBB） locomotor rating scale. Immunohistochemical staining with neuron marker neurofilament 200 （NF200） antibody and astrocyt- ic scar marker glial fibrillary acidic protein （GFAP） was also performed in the injured spinal cord. In the in vitro experiment, the effects of TexasPEG application for 72 hours on the neurite outgrowth of SH-SYSY cells were observed under the inverted microscope. Results of both in vivo and in vitro experiments suggest that TexasPEG reduces the formation of glial scars, promotes the regeneration of neurites, and thereby contributes to the recovery of locomotor function of a rat model of spinal cord transfection.

关键词： nerve regeneration spinal cord transfection spinal cord fusion GEmINI TexasPEG graphene nanoribbons

High thermal 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 Department of Chemistry 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 Department of materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA School of materials Science and Engineering Nanyang Technological University Nanyang Avenue 639798 Singapore College of Electronic Information and Control Engineering Beijing University of Technology Beijing I00124 China The Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA

The thermal conduction of suspended few-layer hexagonal boron nitride （h-BN） sheets was experimentally investigated using a noncontact micro-Raman spectroscopy method. The first-order temperature coefficients for monolayer （1L）, bilayer （2L） and nine-layer （9L） h-BN sheets were measured 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-temperature thermal 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 comparable to that of bulk h-BN, indicating their potential use as important components to solve heat dissipation problems in thermal management configurations.

关键词： two-dimensional hexagonal boron nitride(h-BN) thermal conductivity Raman spectroscopy

Thickness-dependent patterning of moS2 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 Department of Chemistry Rice University 6100 Main Street Houston Texas 77005 USA The Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of mechanical Engineering and materials Science Rice University 6100 Main Street Houston Texas 77005 USA National Center for Nanoscience and Technology Beijing 100190 China

Patterning ultrathin moS2 layers with regular edges or controllable shapes is appealing since the properties of moS2 sheets are sensitive to the edge structures. In this work, we have introduced a simple, effective and well-controlled technique to etch layered moS2 sheets with well-oriented equilateral triangular pits by simply heating the samples in air. The anisotropic oxidative etching is greatly affected by the surrounding temperature and the number of moS2 layers, whereby the pit sizes increase with the increase of surrounding temperature and the number of moS2 layers. First-principles computations have been performed to explain the formation mechanism of the triangular pits. This technique offers an alternative avenue to engineering the structure of moS2 sheets.

关键词： layered moS2 oxidative etching thickness-dependent triangular pits