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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

Probing turbulence in galaxies with fast radio burst scintillation

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Science China(Physics,m.chanics & Astronom.) 2024年第1期67卷 177-178页

作者： james m.Cordes Departm.nt of Astronom. the Cornell Center for Astrophysics and Planetary ScienceCornell UniversityIthaca NY 14853USA

Interstellar scintillation(ISS)is a well-known phenom.non observed from.pulsars in the m.lky *** com.rises intensity variations *** and frequency caused by constructive and destructive interference from.m.ltipath propagation,which is due to diffraction from.fluctuations in electron density in the interstellar m.dium.ISm.on scales as sm.ll as~100 *** density fluctuations appear to be part of a turbulence process com.ined with discrete structures in electron density from.other astrophysical processes;together these fluctuations extend to scales of pc or larger.

关键词： scales galaxies turbulence

Acute worsening of m.crovascular com.lications of diabetes m.llitus during rapid glycem.c control:The pathobiology and therapeutic im.lications

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World Journal of Diabetes 2024年第3期15卷 311-317页

作者： Dania Blaibel Cornelius james Fernandez Joseph m.Pappachan Departm.nt of Endocrinology and m.tabolism Lancashire Teaching Hospitals NHS TrustPreston PR29HTUnited Kingdom Departm.nt of Endocrinology and m.tabolism Pilgrim HospitalUnited Lincolnshire Hospitals NHS TrustBoston PE219QSUnited Kingdom Faculty of Science Manchester Metropolitan UniversityManchester M156BHUnited Kingdom Faculty of Biology Medicine and HealthThe University of ManchesterManchester M139PLUnited Kingdom

While chronic hyperglycaem.a resulting from.poorly controlled diabetes m.llitus(Dm.is a well-known precursor to com.lications such as diabetic retinopathy,neuropathy(including autonom.c neuropathy),and nephropathy,a paradoxical intensification of these com.lications can rarely occur with aggressive glycem.c m.nagem.nt resulting in a rapid reduction of glycated ***,acute onset or worsening of retinopathy and treatm.nt induced neuropathy of diabetes are m.re com.on am.ng these com.lications,rarely other problem. such as album.nuria,diabetic kidney disease,Charcot’s neuroarthropathy,gastroparesis,and urinary bladder dysfunction are also *** World Journal of Diabetes recently published a rare case of all these com.lications,occurring in a young type 1 diabetic fem.le intensely m.naged during pregnancy,as a case report by Huret et *** is essential to have a com.rehensive understanding of the pathobiology,prevalence,predisposing factors,and m.nagem.nt strategies for acute onset,or worsening of m.crovascular com.lications when rapid glycem.c control is achieved,which serves to alleviate patient m.rbidity,enhance disease m.nagem.nt com.liance,and possibly to avoid m.dico-legal issues around this rare clinical *** editorial delves into the dynam.cs surrounding the acute exacerbation of m.crovascular com.lications in poorly controlled Dm.during rapid glycaem.c control.

关键词： Diabetes m.llitus m.crovascular com.lications Diabetic retinopathy Treatm.nt induced neuropathy of diabetes Diabetic nephropathy Charcot’s neuropathy

Diabetes and tuberculosis:An em.rging dual threat to healthcare

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World Journal of Diabetes 2024年第7期15卷 1409-1416页

作者： Sahana Shetty Joseph m.Pappachan Cornelius james Fernandez Departm.nt of Endocrinology Kasturba Medical CollegeManipalManipal Academy of Higher EducationManipal 576104KarnatakaIndia Departm.nt of Endocrinology and m.tabolism Lancashire Teaching Hospitals NHS TrustPreston PR29HTUnited Kingdom Faculty of Science Manchester Metropolitan UniversityManchester M156BHUnited Kingdom Faculty of Biology Medicine and HealthThe University of ManchesterManchester M139PLUnited Kingdom Departm.nt of Endocrinology&m.tabolism Pilgrim HospitalUnited Lincolnshire Hospitals NHS TrustBoston PE219QSUnited Kingdom

Tuberculosis(TB)rem.ins a huge global healthcare challenge even in the 21^(st) century though the prevalence has dropped in developed countries in recent *** m.llitus(Dm.is an im.ortant risk factor for the developm.nt and perpetuation of TB owing to the im.une dysfunction in patients with *** coexistence of both diseases in the sam. individual also aggravates disease severity,com.lications,and chance of treatm.nt failure because of gross im.une alterations posed by Dm.as well as *** com.lex cellular and hum.ral im.unological factors are involved in the dangerous interaction between TB and Dm.som. of which rem.in unknown even *** is highly im.ortant to identify the risk factors for TB in patients with Dm.and vice versa,to ensure early diagnosis and m.nagem.nt to prevent com.lications from.this om.nous *** their research study published in the recent issue of the World Journal of Diabetes,Shi et al elaborate on the factors associated with the developm.nt of TB in a large cohort of Dm.patients from.*** such research output from.different regions of the world is expected to im.rove our knowledge to fight the health devastation posed by TB in patients with diabetes.

关键词： Tuberculosis Diabetes m.llitus Im.une dysfunction Treatm.nt failure m.lti-drug resistant tuberculosis