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Green synthesis of silver nanoparticles using cyathea nilgirensis Holttum and their cytotoxic and phytotoxic potentials

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PARTIcULATE ScIENcE AND TEcHNOLOGY 2018年第5期36卷 578-582页

作者： Antonysamy, M. Johnson Alias Santhanam, A. Thangaiah, S. Narayanan, J. St Xaviers Coll Autonomous Dept Bot Ctr Plant Biotechnol Palayankottai 627002 Tamil Nadu India Univ Madras Nat Ctr Nanosci & Nanotechnol Madras Tamil Nadu India Sri Paramakalyani Coll Dept Bot Tirunelveli Tamil Nadu India

The present study aimed at synthesizing silver nanoparticles (AgNPs) from the aqueous extract of c. nilgirensis and their biopotential using cytotoxicity and phytotoxicity. On mixing the aqueous extract with 1mM AgNO3 solution, the color changes from pale yellow to yellowish brown color. The absorption spectra of yellowish brown nanoparticle showed a plasmon absorption band with a maximum of 3.806 and 1.028 abs in 311 and 440nm, respectively. The Fourier transform infrared spectroscopy (FTIR) spectra confirmed that phenolic compounds have stronger ability to bind with metal, indicating that phenolics could possibly form metal nanoparticles to prevent agglomeration and thereby stabilize the medium. The size of AgNP is found to be in the 45.0-74.0nm range. The Energy-dispersive X-ray (EDX) spectra analysis revealed the presence of a strong Ag peak. The results indicated that c. nilgirensis aqueous extract was found efficient for the synthesis of AgNPs.

关键词： c nilgirensis cytotoxicity FTIR SEM silver nanoparticle UV-Vis

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Repeater insertion for carbon nanotube interconnects

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MIcRO & NANO LETTERS 2014年第5期9卷 337-339页

作者： Zhao, Wen-Sheng Wang, Gaofeng Sun, Lingling Yin, Wen-Yan Guo, Yong-Xin Hangzhou Dianzi Univ Microelect CAD Ctr Key Lab RF Circuits & Syst Minist Educ Hangzhou 310018 Peoples R China Zhejiang Univ Ctr Opt & EM Res State Key Lab MOI Hangzhou 310058 Zhejiang Peoples R China Natl Univ Singapore Dept Elect & Comp Engn Singapore 117576 Singapore

In this reported work, the effects of repeater insertion on the electrical performance of carbon nanotube (cNT) interconnects are studied theoretically. It is shown that the time delay of cNT interconnects, when the length becomes larger than the transition length, can be effectively suppressed by inserting a series of equispaced repeaters. Furthermore, the impact of contact resistance on the repeater insertion is examined and compared. As the single-walled cNT interconnects can endure large contact resistance, its optimal repeater insertion can be determined analytically by neglecting the contact resistances. However, for multi-walled cNT interconnects, the contact resistance must be taken into account in the design of optimal repeater insertion when it exceeds a certain value.

关键词： carbon nanotubes interconnections repeaters contact resistance carbon nanotube interconnects repeater insertion electrical performance contact resistance contact resistance c

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In-situ growing graphitic nanotubes on carbon nanofibres as a 3D hierarchical binder-free anode for high-performance Li-ion battery

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MIcRO & NANO LETTERS 2019年第6期14卷 698-700页

作者： Lu, Ming Wang, Ke-fei Jilin Business & Technol Coll Dept Informat Engn Changchun 130062 Jilin Peoples R China

By facile electrospinning and subsequent melamine-derived chemical vapour deposition strategy, a three-dimensional (3D) hierarchical binder-free carbon electrode is fabricated via in-situ growing nitrogen-rich graphitic nanotubes on carbon nanofibres. This electrode shows a 3D hierarchical nanostructure with the high specific surface. Owing to the highly conductive hierarchical structure allowing for rapid transportation of electrons and the N-doped carbon creating more Li-storage sites, the as-prepared binder-free electrode exhibits high reversible capacity, good rate capability and long cycle stability in terms of Li-ion battery.

关键词： graphite nanofabrication nitrogen chemical vapour deposition electrospinning electrochemical electrodes nanotubes c conductive hierarchical structure melamine-derived chemical vapour deposition strategy nitrogen-rich graphitic nanotubes specific surface binder-free electrode 3D hierarchical nanostructure three-dimensional hierarchical binder-free carbon electrode facile electrospinning high-performance Li-ion battery 3D hierarchical binder-free anode carbon nanofibres Li-storage sites

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Mode analysis and research on graphene nanoribbons parallel-plate waveguide

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Micro & Nano Letters 2015年第10期10卷 558-560页

作者： Qin, Kang Xiao, Binggang Sun, Runliang Ji Liang Univ China Coll Informat Engn Hangzhou 310018 Zhejiang Peoples R China

A graphene nanoribbon parallel-plate waveguide (GNPPW) in the infrared band is reported. Owing to the large loss, difficulty of control and shortages of traditional metals, graphene has been considered as a novel plasmonic material as the substitute for metals. In this reported work, the relationship between the dispersion characteristics, the propagation loss of the GNPPW's surface plasmon and the filled dielectric into the GNPPW are analysed. The results show that filling dielectric with a large permittivity can improve the confinement of the symmetric mode supported by the GNPPW. Moreover, the transmission distance and dispersion characteristics of the GNPPW under different chemical potentials are analysed. The performance of the waveguide can be effectively controlled by the filling dielectric and external means such as static voltage, achieving easy regulation and control of graphene. This research has some reference values for the production of novel graphene waveguide devices.

关键词： graphene nanoribbons parallel plate waveguides graphene devices plasmonics surface plasmons disperse systems permittivity mode analysis graphene nanoribbon parallel-plate waveguide infrared band plasmonic material dispersion characteristics propagation loss GNPPW surface plasmon filling dielectric permittivity symmetric mode chemical potentials static voltage graphene waveguide device c

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HYDROGEN AND cARBON ISOTOPE FRAcTIONATION DURING EXPERIMENTAL PRODUcTION OF BAcTERIAL METHANE

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ORGANIc GEOcHEMISTRY 1987年第2期11卷 115-119页

作者： BALABANE, M GALIMOV, E HERMANN, M LETOLLE, R INST FRANCAIS PETR BIOTECHNOL ENVIRONNEMENT LABF-92506 RUEIL MALMAISONFRANCE

This paper presents c and H isotope compositions of compounds involved in methane production by pure cultures of Methanobacterium formicicum . The c isotope compositions of the methane produced and of the residual cO 2 are compared to data observed in natural conditions in marine sediments. This comparison leads to further evidence that cO 2 reduction is an important mechanism for microbial generation of methane in deep marine sediments. The H isotope compositions show involvment of the water hydrogen into methane as well as hydrogen exchange between water and molecular hydrogen in the course of cO 2 reduction. A mechanism is proposed as a possible explanation for the data obtained involving conjugated reactions of cO 2 -reduction and enzymatic reduction of water.

关键词： 13 c deuterium methane Methanobacterium formicicum

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Micro/nano X-ray tomography reconstruction fine-tuning using scanning electron microscope images

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MIcRO & NANO LETTERS 2008年第4期3卷 106-109页

作者： Ostadi, H. Jiang, K. Prewett, P. D. Univ Birmingham Sch Mech Engn Birmingham B15 2TT W Midlands England

The use of scanning electron microscope (SEM) images as references for threshold tuning of X-ray micro/nano computed tomography reconstruction is proposed. In this research, high-resolution SEM images were used to provide a good estimation of the fibre diameter in the surface of gas diffusion layers (GDL) (5-10 mu m). The X-ray tomography reconstructed binary images containing 3D information, including both the surface and the inside volume. Using the SEM images of a particular feature in carbon fibres, GDL layers were compared with the reconstructed surface of that feature from X-ray tomography data and provided the threshold estimation for reconstruction of the whole structure. Fibre diameter and continuity of the material from both the cT reconstruction and SEM images were analysed to obtain the optimum reconstruction. A linear relationship between fibre diameter and threshold variation has been found for micro/nano tomography of GDL layers.

关键词： diffusion proton exchange membrane fuel cells microX-ray tomography reconstruction fine-tuning nanoX-ray tomography reconstruction fine-tuning c X-ray microscopy high-resolution SEM images size 5 mum to 10 mum carbon fibres image reconstruction scanning electron microscopy Microstructure Structure of fullerenes and fullerene-related materials crystal microstructure computerised tomography fibre diameter scanning electron microscope images PEM fuel cell nanostructured materials gas diffusion layers

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Large-area solar-blind AlGaN-based MSM photodetectors with ultra-low dark current

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ELEcTRONIcS LETTERS 2011年第16期47卷 930-931页

作者： Xie, F. Lu, H. chen, D. J. Han, P. Zhang, R. Zheng, Y. D. Li, L. Jiang, W. H. chen, c. Nanjing Univ Jiangsu Prov Key Lab Adv Photon & Elect Mat Nanjing 210093 Peoples R China Nanjing Univ Sch Elect Sci & Engn Nanjing 210093 Peoples R China Nanjing Electron Devices Inst Natl Key Lab Monolith Circuits & Modules Nanjing 210016 Peoples R China

Large-area metal-semiconductor-metal (MSM) solar-blind photodetectors with a device area of 5 x 5 mm(2) have been fabricated on Al0.4Ga0.6N/AlN/sapphire epistructure. The photodetector exhibits ultra-low dark current density of 3.2 x 10(-12) A/cm(2) under 20 V bias and a corresponding breakdown voltage of up to 385 V. The solar-blind/ultraviolet rejection ratio of the photodetector is more than four orders of magnitude with a maximum quantum efficiency of 28% at 275 nm.

关键词： AlGaN-AlN c III-V semiconductors MSM photodetectors aluminium compounds current density efficiency 28 percent gallium compounds large-area metal-semiconductor-metal solar-blind photodetectors photodetectors sapphire epistructure solar-blind-ultraviolet rejection ratio ultra-low dark current density voltage 20 V wavelength 275 nm wide band gap semiconductors

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Functionalisation of aligned carbon nanotubes with nitric acid vapour

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MIcRO & NANO LETTERS 2011年第8期6卷 704-708页

作者： Shulga, E. Pohako, K. Treshchalov, A. Joost, U. Kisand, V. Kink, I. Univ Tartu Inst Phys EE-51014 Tartu Estonia Univ Tartu Inst Chem EE-50411 Tartu Estonia Estonian Nanotechnol Competence Ctr EE-51014 Tartu Estonia

Millimetre high aligned carbon nanotubes (AcNTs) were functionalised by nitric acid vapour at low temperature with the formation of carbonyl and carboxyl functional groups. Samples were analysed using a scanning electron microscope (SEM), EDX, Fourier transformed infrared (FTIR), Raman and X-ray photoelectron spectroscopy (XPS). Depending on the temperature and reaction time, the treatment can lead to uniform sidewall functionalisation preserving the alignment of the AcNT 'forest', to random destruction, leading to significant modification of the morphology of the AcNT 'forest', or in some cases to cutting off the AcNTs from the substrate. Influence of the treatment duration and temperature on samples morphology and oxygen-to-carbon ratio are discussed.

关键词： crystal growth from vapour infrared spectra c surface morphology vapour deposition Raman spectroscopy treatment duration scanning electron microscopy FTIR millimetre high aligned carbon nanotubes XPS Raman spectra EDX SEM reaction time X-ray photoelectron spectra Infrared and Raman spectra in inorganic crystals oxygen-to-carbon ratio Solid surface structure Photoelectron spectra of semiconductors and insulators carboxyl functional group formation AcNT forest morphology carbon nanotubes scanning electron microscope carbonyl formation Fourier transform spectra Fourier transformed infrared spectroscopy nanofabrication X-ray photoelectron spectroscopy Electron spectroscopy for chemical analysis (photoelectron, Auger spectroscopy, etc.) sidewall functionalisation Methods of nanofabrication and processing

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Equivalent mechanical boundary conditions for single layer graphene sheets

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MIcRO & NANO LETTERS 2016年第5期11卷 248-252页

作者： Sadeghzadeh, Sadegh Iran Univ Sci & Technol Sch New Technol Tehran Iran

To describe and analyse mechanical structures due to external loads, equation of motion must be supplemented with appropriate boundary conditions. When nanomechanical structures (especially layered systems) are considered, satisfying the boundaries is more challenging. It may be essential to develop a specific methodology for any system in such scale and configuration. This work introduces a general approach for boundary conditions of monolayer graphene sheets as the most important part of future sensors and resonators in nanoelectromechanical systems. comparing with the experiments, it has been demonstrated that the graphene sheets on the adhesive surfaces should be assumed as a hinged edge condition and not as a clamped one. As a result, inaccuracy of the commonly used rigid base as a clamped condition is proven due to comparison with a reported experiment. It is suggested that a flexible substrate can be replaced to have better accordance. A flexible silicon base with equilibrium distance equal to s = 2.5 angstrom and depth of potential well equal to epsilon = 0.02 eV is obtained as the best substrate for a square graphene sheet under doubly clamped edge conditions.

关键词： graphene nanomechanics nanoelectromechanical devices monolayers equivalent mechanical boundary conditions external loads equation of motion nanomechanical structures nanoelectromechanical systems adhesive surfaces hinged edge condition flexible silicon base doubly clamped edge conditions monolayer graphene sheets distance 2 5 angstrom c Si

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On the axial vibration of carbon nanotubes with different boundary conditions

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MIcRO & NANO LETTERS 2014年第11期9卷 807-811页

作者： Yayli, Mustafa Ozgur Bilecik Seyh Edebali Univ Dept Civil Engn TR-11210 Bilecik Turkey

In this reported work, the free axial vibration response of carbon nanotubes (cNTs) with arbitrary boundary conditions is studied based on the non-local elasticity theory. Using Fourier sine series together with Stokes'transformation, the general frequency determinant of cNTs is obtained. The main advantage of this method is its capability of dealing with rigid or restrained boundary conditions. comparisons between the results of the presented method and previous works in the literature have been performed. Good agreement is obtained when enough terms are included in the Fourier series expansion. The effects of spring parameters on the vibration frequencies are discussed in detail. The proposed analytical method can be utilised for dynamic analyses of nanorods (cNTs) with arbitrary boundary conditions.

关键词： vibrations carbon nanotubes elasticity Fourier series carbon nanotubes free axial vibration response arbitrary boundary conditions nonlocal elasticity theory Fourier sine series Stokes transformation general frequency determinant rigid boundary conditions Fourier series expansion spring parameters vibration frequencies dynamic analyses nanorods restrained boundary conditions c

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