Papers:
Failure mechanism and property improvement of carbon-nanotube fibers
Carbon-nanotube (CNT) fibers have already demonstrated the potentials of retaining the intrinsic properties of individual CNTs at a practical scale level. But current reports in this area show large variations and inconsistence in fiber’s properties, [...]
Ultrafine Sensing Using Carbon Nanotube Arrays
Arrays of Carbon Nanotubes (CNTs) have shown the ability to react as foam-like structures and display local buckling within the bulk. The arrays, or turfs, are high aspect ratio CNT fibers that extend up to [...]
Carbon nanotubes based photocathodes for multisource X-Ray generators
Carbon nanotubes (CNT) cathodes are cold field emitters. CNT photocathode consist in combination of CNTs with photodetectors. In a CNT photocathode, the photodetector limits the current that the CNT emit under electric field. As a [...]
Acoustic energy harvesting using nanotube sheet flutter
Kang T.J., Jang E.Y., Lima M.D., Im H., Ovalle-Robles R., Kim T., Kim Y.H., Baughman R.H., Kim T., Kim Y.H., Seoul National University, KR
Energy harvesting from the surrounding environment has attracted much interest for diverse applications. One of the most widely available forms of ambient energy is acoustic noise, which is essentially inexhaustible and everywhere, however few research [...]
CNTFETs fabricated using an Original Dynamic Air-Brush technique for SWCNTs deposition : application to gas sensing
This contribution deals with Carbon Nanotubes Field Effect transistors (CNTFETs) based gas sensors fabricated using a completely new dynamic air-brush technique for SWCNTs deposition. More precisely, we have developed a machine which allows us the [...]
Metal Induced Intershell Coupling and Conductance Enhancement in Multiwalled Carbon Nanotubes
Kulshrestha N., Misra A., Misra D.S., Bajpai R., Roy S., Misra A., Misra D.S., Indian Institute of Technology - Bombay, IN
Using two different metal (platinum and Tungsten) depositions on the individual multiwalled carbon nanotubes bridging the spacing between two gold electrodes, we segregate the contributions of change in nanotubes inherent properties and contact-improvement in total [...]
Low-Z, Chemically Resistant, Microfabricated Carbon Composite Transmission Electron Microscope Grids
An issue that often impacts x-ray and electron analysis of transmission electron microscopy (TEM) samples is the presence of high-Z atoms in the sample substrate. In many cases, it is also desirable that the chosen [...]
Optimization of Carbon Nanotube Thin-Film Transistor Fabrication
Carbon nanotube–based thin-film transistors have recently gained much interest from many researchers and customers for their potential in large-area electronic applications, including flexible electronics. Single-walled carbon nanotubes (SWCNTs) possess the ability to offer a high [...]
A Comparative Analysis of Transistors Based on Dielectrophoresis-Aligned Carbon Nanotubes (CNTs) and Assembled Random-Network CNTs
CNTs have gained significant attention due to their potential as an alternative nanomaterial to be utilized in micro/nano-scale electronics. To continuously improve the performance of CNT-based electronic devices, the CNTs and their manipulation methods must [...]
Development of materials and printing methods for fabrication of thin-film transistors on flexible substrates
Zhao J.W., Gao Y.L., Gu W.B., Lin J., Chen Z., Cui Z., Suzhou Institute of Nanotech and nano-bionics, Chinese Academy of Sciences, CN
In the present work, we attempted to put together a suite of technologies for printing TFTs on flexible substates. The ink materials we investigated include optimized SCNT inks as printable semiconductors, development of composite ion-gel [...]
Effect of Cutting Parameters on The Surface Roughness of MWCNT Reinforced Epoxy Composite Using End-Milling Process
In this paper, the preparation and casting of sample composite, machining parameters and Scanning electron microscopy (SEM) studies on multi-walled carbon nanotubes (MWCNT) reinforced epoxy composites were discussed. Structurally, MWCNTs consist of multiple layers of [...]
The Detection Properties of Bulky Wrapped MWCNTs Towards Hazardous Gases
Nowadays, chemical sensors are attracting great interest because of their widespread applications in the industrial and environmental fields. Indeed, sensors with high sensitivity and selectivity are required for real-time detection of hazardous gas leaks. In [...]
Change of the Electronic Conductivity of CNTs and Graphene Sheets Caused by a Three-dimensional Strain Field
Since the electronic structure of deformed carbon nanotubes (CNTs) varies widely depending on their chirality and deformation mode, CNTs have the potential to be high-quality strain sensors. The authors revealed the possibility of the high [...]
Analog/RF Performance Analysis of Coaxial Carbon Nanotube MOSFET from non-Equilibrium Green’s Function Simulation
Che Y., Chen Q., Liang H., Chen Q., Wang C., He H., Cao Y., PKU-HKUST Shenzhen-Hongkong Institution, CN
the analog/RF performance of Coaxial Carbon Nanotube Field Effect Transistor (CNTFET) including the trans-conductance efficiency gm/Id, cutoff frequency ft, and maximum oscillation frequency fmax are analyzed in details in this paper based on the non-equilibrium [...]
In situ optical investigations into the nucleation and growth mechanism of carbon nanotubes
Reinhold-López K., Braeuer A., Popovska-Leipertz N., Leipertz A., Popovska-Leipertz N., University of Erlangen-Nuremberg, DE
During the catalytic chemical vapor deposition (CCVD) of carbon nanotubes (CNTs) the gas phase has been investigated by applying linear Raman spectroscopy and particle image velocimetry (PIV) in a specially designed cold wall reactor. Via [...]
A New Type of Carbon Nanostructure Formed Within a Metal-Matrix
Salamanca-Riba L., Herzing A., Mansour A., Hall A., Forrest D.R., LeMieux M., Shugart J., University of Maryland, US
Recent advances in nanomanufacturing have made it possible for large amounts (up to 6 wt.%) of carbon to be incorporated as nanoscale carbon during a reaction process in molten metals. These materials are called “covetics”. [...]
Mapping nanomechanical phenomena of graphene nanostructures using force modulation and ultrasonic force microscopy
Whereas graphene electronic properties are extensively studied, mechanical properties of graphene nanostructures are much less experimentally explored even for simple graphene structures. We use a combination of force sensitive scanning probe microscopies that combines low [...]
Carbon Based Dimensional Composites
Dimensional dependence of mechanical response in carbon nanostructure composites to near-infrared (NIR) light are reported. Using polydimethylsiloxane, composites were fabricated with one-dimensional multi-wall carbon nanotubes (MWCNTs), two dimensional single-layer graphene, two and a half-dimensional graphene [...]
Photomechanical Response in Graphene Nanoplatelet Composites
Loomis J., King B., Burkhead T., Xu P., Bessler N., Terentjev E., Panchapakesan B., University of Louisville, US
Large light-induced reversible and elastic responses of graphene nanoplatelet (GNP) polymer composites are reported. Homogeneous mixtures of GNP/polydimethylsiloxane (PDMS) composites (0.1–5 wt%) were prepared and their near-infrared (NIR) mechanical responses studied with increasing pre-strains. Using [...]
Near-Infrared Light Induced Mechanical Responses in Single-to-Few Layer Graphene
Layer dependent physical responses of graphene-based polymer composites to near-infrared (NIR) light are reported. Thin film polymer composites were fabricated and compared utilizing both single layer graphene and few layer graphene (~5 layers). NIR-induced axial [...]
Unusual thermal diffusion of carbon nanotubes in a thermoplastic polymer
The dispersion of carbon nanotubes in polymer composites is a major challenge. Although nanotubes have a high aspect ratio, their tendency to agglomerate limit percolation at low loading. We find that thermal diffusion is reducing [...]
Electrical conductivity of carbon nanopowder fillers and their respective polymer composites prepared via latex technology
Ghislandi M., Marinho B., Tkalya E., Koning C.E., de With G., Eindhoven University of Technology, NL
The electrical conductivity of graphene, multi-wall carbon nanotubes (MWCNTs) and carbon black (CB) nanopowders, and graphite powder is characterized in the form of paper-like films (buckypapers) and by means of powder compression. Subsequently, carbon filler [...]
The study of the microwave absorption and optical properties of the Al- N codoped SiC Nanopowders
Nanopowders of aluminum and nitrogen codoped β-silicon carbide (β-SiC) were successfully produced by self-propagating high-temperature synthesis in a nitrogen atmosphere. Characterizations by X-ray diffraction and scanning electron microscopy demonstrate the formation of Al-N codoped β-SiC [...]
Morphology control of carbon nanotubes in continuously spun fibres
Multifunctional attributes of carbon nanotubes (CNTs) have attracted the focus of industrial and academic communities alike. Translating the properties of individual CNTs into their macroscopic ensembles – fibres, yarns or films - is envisaged to [...]
Stacked Self-standing Carbon Nanotube Forest Films utilizing Periodical Multi-layered (Fe/AlN)n Films
A novel Carbon Nanotube structure, stacked self-standing carbon nanotube forest films achieved by a newly developed periodically deposited multi-layered (Fe/AlN)n film, are presented. Fe and AlN films were deposited on the substrate periodically by magnetron [...]
Moisture Assisted Electron Transport in Si-C Nanotubes: an ab-initio study
We investigate the effect of moisture-chemisorption on the electron transport properties in a (8, 0) semiconducting silicon-carbide nanotube (SiCNT) by applying self consistent non-equilibrium Green’s function formalism in combination with the density-functional theory. The results [...]
Preparation Routes to Aqueous Graphene Dispersions and Their Influence on Electrical Conductivity of Polymer Composites
In this work, starting from graphite, we produced graphene dispersed in water following the two main chemical conversion approaches and a physical conversion via ultrasonic exfoliation. Subsequently, graphene /polystyrene (PS) composites were prepared using the [...]
Length amplification of single walled carbon nanotubes for the enrichment of chiral specific nanotubes
At Rice University there is a large body of work relating to the development of an “Armchair Quantum Wire”. This would be composed of armchair SWNTs spun into a fiber, that could span global distances. [...]
Plasmon Generation by Excitons in Carbon Nanotubes
Optically excited excitons are theoretically demonstrated to generate and amplify plasmons in individual semiconducting carbon nanotubes. Plasmons are coherent charge density waves due to the periodic opposite-phase displacements of the electron shells with respect to [...]
Dependence of electrical and thermal parameters of CNT bundles on their geometry
Carbon nanotube bundles are being considered for VLSI interconnect applications due to their superior electrical and thermal properties. In this paper we report the variation in electrical and thermal conductance as well as inductance of [...]
Carbon Nanotube Thin Film based Fuel Cell to Reach DOE Targets
We demonstrate a prototype polymer electrolyte membrane fuel cell (PEMFC) that reaches the technical targets set by DOE for 2015. We show that the Pt required for automotive fuel cells can be reduced by an [...]
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Industry sector: Advanced Materials & Manufacturing
Topic: Carbon Nano Structures & Devices
ISBN: 978-1-4665-6274-5