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Experimental determination of the Young’s modulus of individual single-walled carbon nanotubes with single chirality

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Nano Research 2024年第8期17卷 7522-7532页

作者： Jianlin Sun Xiao Zhang Yanchun Wang Mingming Li Xiaojun Wei Huaping Liu Weiya Zhou Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences and College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China

One-dimensional carbon nanotube(CNT)exhibits excellent mechanical properties and is considered to be an ideal candidate material for the space ***,subtle changes in its chirality strongly affect its physical and chemical properties,including mechanical properties(such as Young's modulus,YM).Theoretical studies reveal that the YMs of perfect single-walled carbon nanotubes(SWCNTs)are in the order of TPa and related to their ***,due to the lack of SWCNTs samples with well-defined structures and the difficulties in mechanical tests on individual SWCNTs,the theoretical correlations between YM and structure of SWCNTs have not been verified and are still in debate,which directly influences the practical utilization of the excellent mechanical properties of *** this work,we have developed an experimental method to measure the YM of an individual micrometer-scale suspended CNT by atomic force microscopy.A distinct regularity is found between the YM and chirality(i.e.,chiral angle and diameter)of SWCNT in the experiment for the first *** comparing the YMs of SWCNTs with similar diameters and different chiral angles,it manifests that the SWCNT with a near zigzag configuration has a larger *** finding suggests that the effect of SWCNT’s structures on the YMs cannot be *** developed method of measuring YMs of SWCNTs will be valuable for further experimental research on the inherent physical and chemical properties of SWCNTs.

关键词： Young's modulus single-walled carbon nanotubes single chirality atomic force microscopy

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Highly selective growth of(6,5)single-walled carbon nanotubes from sigma phase alloy catalyst

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Nano Research 2024年第3期17卷 1999-2003页

作者： Liantao Xin Chen Ma Qianru Wu Shaokang Liu Linhai Li Xiuyun Zhang Liu Qian Maoshuai He Dong Li Fangqian Han Shulan Hao Lihu Feng Yahan Li Huaping Liu Lili Zhang Chang Liu Jin Zhang College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The chirality structure of a single-walled carbon nanotube(SWNT)strongly depends on the composition of catalyst used in the chemical vapor deposition *** this study,we develop a porous magnesia supported manganese-rhenium(MnRe/MgO)catalyst for chirality-selective synthesis of *** characterizations reveal that(6,5)tubes with a selectivity higher than 70%are grown from the Re-rich MnRe/MgO *** comparing the SWNT growth results with those of monometallic Mn or Re,the formation of sigma phase,an intermetallic compound occurring in transition-metal alloy systems,is revealed to be crucial for the dominant synthesis of(6,5)*** work not only extends the application of sigma phase alloy for catalytic synthesis of SWNTs,but also sheds lights on the growth of SWNTs with a high chirality selectivity.

关键词： single-walled carbon nanotubes sigma phase manganese-rhenium catalyst selective growth transition-metal alloy

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single-walled carbon nanotubes for Flexible Electronics and Sensors

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Journal of Materials Science & Technology 2008年第4期24卷 569-577页

作者： Xiuyun SUN Yugang SUN Department of Mechanical and Electronic Engineering Dezhou University Dezhou 253023 China Center for Nanoscale Materials Argonne National Laboratory 9700 South Cass Avenue Argonne Illinois 60439 USA

This article reviews the use of electronic quality single-walled carbon nanotubes grown via chemical vapor deposition （CVD） approaches at high temperatures as building blocks for fabricating flexible field-effect devices, such as thin-film transistors （TFTs） and chemical sensors. Dry transfer printing technique is developed for forming films of CVD nanotubes on low-temperature plastic substrates. Examples of TFTs with the use of nanotubes and thin dielectrics and hydrogen sensors with the use of nanotubes decorated with palladium nanoparticles are discussed in detail to demonstrate the promising potentiality of single-walled carbon nanotubes for building high performance flexible devices, which can find applications where traditional devices on rigid substrates are not suitable.

关键词： single-walled carbon nanotubes Flexible Electronics Sensors

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Water-assisted self-sustained burning of metallic single-walled carbon nanotubes for scalable transistor fabrication

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Nano Research 2017年第9期10卷 3248-3260页

作者： Keigo Otsuka Taiki Inoue Yuki Shimomura Shohei Chiashi Shigeo Maruyama Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Energy NanoEngineering Lab. National Institute of Advanced Industrial Science and Technology (AIST) 1-2-1 Namiki Tsukuba 305-8564 Japan

Although aligned arrays of semiconducting single-walled carbon nanotubes (s-SWNTs) are promising for use in next-generation electronics owing to their ultrathin bodies and ideal electrical properties, even a small portion of metallic (m-) counterparts causes excessive leakage in field-effect transistors (FETs). To fully exploit the benefits of s-SWNTs for use in large-scale systems, it is necessary to completely eliminate m-SWNTs from as-grown SWNT arrays and thereby obtain purely semiconducting large-area arrays, wherein numerous FETs can be flexibly built. In this study, we performed electrical burning of m-SWNTs assisted by water vapor and polymer coating to eliminate m-SWNTs over a long length for the scalable fabrication of transistors from the remaining s-SWNT arrays. During the electrical-breakdown process, the combination of water vapor and the polymer coating significantly enhanced the burning of the SWNTs, resulting in a self-sustained reaction along the nanotube axis. We found that m-SWNT segments partially remaining on the anode side resulted from one-way burning from the initial breakdown position, where Joule-heating-induced oxidation first occurred. The s-SWNT-enriched arrays obtained were used to fabricate multiple FETs with a high on-off current ratio. The results indicate the advantages of this approach over conventional electrical breakdown for the large-scale purification of s-SWNTs.

关键词： single-walled carbon nanotubes field-effect transistor selective removal electrical breakdown one-way burning

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Silver nanoparticles-decorated and mesoporous silica coated single-walled carbon nanotubes with an enhanced antibacterial activity for killing drug-resistant bacteria

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Nano Research 2020年第2期13卷 389-400页

作者： Yu Zhu Jia Xu Yanmao Wang Cang Chen Hongchen Gu Yimin Chai Yao Wang Shanghai Jiao Tong University Affiliated Sixth Peoples Hospital School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200030China

The mounting threat of antibiotic-resistant bacterial infections has made it imperative to develop innovative antibacterial *** we propose a novel antibacterial nanoplatform of silver nanoparticles-decorated and mesoporous silica coated single-walled carbon nanotubes constructed via a N-[3-(trimethoxysiltyl)propyl]ethylene diamine(TSD)-mediated method(SWCNTs@mSiO2-TSD@Ag).In this system,the outer mesoporous silica shells are able to improve the dispersibility of SWCNTs,which will increase their contact area with bacteria cell ***,the large number of mesopores in silica layers act as microreactors for in situ synthesis of Ag NPs with controlled small size and uniform distribution,which induces an enhanced antibacterial *** with TSD modified mesoporous silica coated single-walled carbon nanotubes(SWCNTs@mSiO2-TSD)and commercialAg NPs,this combination nanosystem of SWCNTs@mSiO2-TSD@Ag exhibits much stronger antibacterial performance against multi-drug-resistant bacteria Escherichia coli(***)and Staphylococcus aureus(***)in vitro through damaging the bacterial cell membranes and a fast release of silver ***,the in vivo rat skin infection model verifies that SWCNTS@mSiO2-TSD@Ag have remarkably improved abilities of bacterial clearance,wound healing promoting as well as outstanding ***,this novel nanoplatform indicates promising potentials as a safe and powerful tool for the treatment of clinical drug-resistant infections.

关键词： silver nanoparticles single-walled carbon nanotubes drug-resistant bacteria enhanced antibacterial activity wound infections

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PEGYLATED single-walled carbon nanotubes WITH GELABLE BLOCK COPOLYMERS

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Chinese Journal of Polymer Science 2011年第6期29卷 762-771页

作者：陈永明 Laboratory of Polymer Physics and Chemistry Institute of Chemistrythe Chinese Academy of Sciences

Functional amphiphilic block copolymer poly（ethylene glycol）-block-poly[（3-（triethoxysilyl）propyl methacrylate）- co-（1-pyrene-methyl） methacrylate], PEG113-b-P（TEPM26-co-PyMMA4）, was synthesized via atom transfer radical polymerization （ATRP） initiated by monomethoxy capped poly（ethylene glycol） bromoisobutyrate. This polymer exhibited strong ability to disperse and exfoliate single-walled carbon nanotubes （SWNTs） in different solvents due to the adhesion of pyrene units to surface of SWNTs. In aqueous solution, the PTEPM segments that were located on the nanotube surfaces with the pyrene units could be gelated and, as a result, the silica oxide networks with PEG coronas were formed on the surface of nanotubes, which ensured the composites with a good dispersibility and stability. Furthermore, functional silane coupling agents, 3-mereaptopropyltrimethoxysilane and 3-aminopropyltriethoxysilane, were introduced during dispersion of SWNTs using the block copolymers. They were co-gelated with PTEPM segments, and the --SH and --NH2 functionalities were introduced into the silica oxide coats respectively.

关键词： Amphiphilic block copolymer Functionality PEGylated single-walled carbon nanotubes

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Synthesis of nitrogen-doped single-walled carbon nanotubes and monitoring of doping by Raman spectroscopy

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Chinese Physics B 2013年第8期22卷 215-220页

作者：吴慕鸿李晓潘鼎刘磊杨晓霞许智王文龙隋郁白雪冬 Department of Physics Harbin Institute of Technology Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences International Center for Quantum Materials School of Physics Peking University

Nitrogen-doped single-walled carbon nanotubes （CNx-SWNTs） with tunable dopant concentrations were synthesized by chemical vapor deposition （CVD）, and their structure and elemental composition were characterized by using transmission electron microscopy （TEM） in combination with electron energy loss spectroscopy （EELS）. By comparing the Raman spectra of pristine and doped nanotubes, we observed the doping-induced Raman G band phonon stiffening and 2D band phonon softening, both of which reflect doping-induced renormalization of the electron and phonon energies in the nan- otubes and behave as expected in accord with the n-type doping effect. On the basis of first principles calculations of the distribution of delocalized carrier density in both the pristine and doped nanotubes, we show how the n-type doping occurs when nitrogen heteroatoms are substitutionally incorporated into the honeycomb tube-shell carbon lattice.

关键词： single-walled carbon nanotubes nitrogen doping chemical vapor deposition Raman spectroscopy

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High-energy pulse generation using Yb-doped Q-switched fiber laser based on single-walled carbon nanotubes

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Chinese Physics B 2015年第9期24卷 532-535页

作者：王军利汪雪玲贺博荣朱江峰魏志义王勇刚 School of Physics and Optoelectronic Engineering Xidian University Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences

An all-fiber laser using a single-walled carbon nanotube（SWCNT） as the saturable absorber（SA） for Q-switched operation in the 1031 nm region is demonstrated in this work. A lasing threshold as low as 17 mW was realized for continuous wave operation. By further increasing the pump power, stable Q-switched pulse trains are obtained when the pump power ranges from 38 mW to 125 mW, corresponding to repetition rate varying from 40.84 kHz to 66.24 kHz, the pulse width from 2.0 μs to 1.0 μs,and the highest single pulse energy of 40.6 nJ respectively.

关键词： Yb-doped Q-switching all-fiber lasers single-walled carbon nanotubes

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High-performance transparent conducting films of long single-walled carbon nanotubes synthesized from toluene alone

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Nano Research 2020年第1期13卷 112-120页

作者： Er-Xiong Ding Aqeel Hussain Saeed Ahmad Qiang Zhang Yongping Liao Hua Jiang Esko I.Kauppinen Department of Applied Physics School of ScienceAalto UniversityPuumiehenkuja 200076AaltoEspooFinland

single-walled carbon nanotube(SWCNT)transparent conducting films(TCFs)are attracting increasing attention due to their exceptional optoelectronic *** is a proposed carbon source for SWCNT synthesis,but the growth parameters of SWCNTs and their TCF optoelectronic performance(i.e.,sheet resistance versus transmittance)have been insufficiently ***,we have for the first time reported a systematic study of the fabrication of high-performance SWCNT TCFs using toluene alone as the carbon *** mechanisms behind each observed phenomenon were elucidated using optical and microscopy *** optimizing the growth parameters,high yields of SWCNT TCFs exhibiting a considerably low sheet resistance of 57Ω/sq at 90%transmittance were *** competitive optoelectronic performance is mainly attributable to long SWCNT bundles(mean length is 41.4μm)in the ***,a chirality map determined by electron diffraction displays a bimodal distribution of chiral angles divided at 15°,which is close to both armchair and zigzag *** study paved the way towards scaled-up production of SWCNTs for the fabrication of high-performance TCFs for industrial applications.

关键词： single-walled carbon nanotubes transparent conducting films toluene floating catalyst chemical vapor deposition

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Increased chemical reactivity of single-walled carbon nanotubes on oxide substrates： In situ imaging and effect of electron and laser irradiations

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Nano Research 2016年第2期9卷 517-529页

作者： Hasan-al Mehedi Johann Ravaux Khadija Yazda Thierry Michel Said Tahir Michael Odorico Renaud Podor Vincent Jourdain Laboratoire Charles Coulomb (L2C) UMR 5221 CNRS-Universite de Montpellier 34095 Mon tpellier France Institut de Chimie Separative de Marcoule UMR 5257 CEA-CNRS-UM2-ENSCM Site de Marcoule Bat 426 BP 17171 30207 Bagnols sur Ceze cedex France

We studied the oxygen etching of individual single-walled carbon nanotubes on silicon oxide substrates using atomic force microscopy and high-temperature environmental scanning electron microscopy. Our in situ observations show that carbon nanotubes are not progressively etched from their ends, as frequently assumed, but disappear segment by segment. Atomic force microscopy, before and after oxidation, reveals that the oxidation of carbon nanotubes on substrates proceeds through a local cutting that is followed by a rapid etching of the disconnected nanotube segment. Unexpectedly, semiconducting nanotubes appear more reactive under these conditions than metallic ones. We also show that exposure to electron and laser beams locally increases the chemical reactivity of carbon nanotubes on such substrates. These results are rationalized by considering the effect of substrate-trapped charges on the nanotube density of states close to the Fermi level, which is impacted by the substrate type and the exposure to electron and laser beams.

关键词： single-walled carbon nanotubes environmental scanning electron microscopy oxidative etching substrate-trapped charges electron and laser irradiations

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