scholarly journals Mechanical Pressure Characterization of CNT-Graphene Composite Material

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 1000 ◽  
Author(s):  
Asar Ali ◽  
Farman Ali ◽  
Muhammad Irfan ◽  
Fazal Muhammad ◽  
Adam Glowacz ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Devices ◽  
Applied Pressure ◽  
Mechanical Pressure ◽  
Weight Percentage ◽  
Graphene Composite ◽  
Sensing Technology ◽  
Dc Resistance

Carbon nanotubes (CNTs) and graphene are extensively studied materials in the field of sensing technology and other electronic devices due to their better functional and structural properties. Additionally, more attention is given to utilize these materials as a filler to reinforce the properties of other materials. However, the role of weight percentage of CNTs in the piezoresistive properties of these materials has not been reported yet. In this work, CNT-graphene composite-based piezoresistive pressure samples in the form of pellets with different weight percentages of CNTs were fabricated and characterized. All the samples exhibit a decrease in the direct current (DC) resistance with the increase in external uniaxial applied pressure from 0 to 74.8 kNm−2. However, under the same external uniaxial applied pressure, the DC resistance exhibit more decrease as the weight percentage of the CNTs increase in the composites.

scholarly journals Fabrication and Characterization of Physical and Mechanical Properties of Carbon Nanotubes—Graphene-Based Sandwich Composite Pressure Sensor

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1284
Author(s):  
Asar Ali ◽  
Farman Ali ◽  
Ahmad Rashedi ◽  
Ammar Armghan ◽  
M. R. Nurul Fajita ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Physical And Mechanical Properties ◽  
Hydraulic Press ◽  
Sandwich Composite ◽  
Multiwalled Carbon ◽  
Sandwich Type ◽  
Ag Paste

In this work, piezoresistive properties of graphene-multiwalled carbon nanotubes (MWCNTs) composites are investigated, characterized, and compared. Sandwich-type composite piezoresistive pressure-sensitive sensors (Ag/Graphene-MWCNT/Ag) with the same diameters, but different fabrication pressures and thicknesses were fabricated using the mortar and pestle/hydraulic press technique. To produce low-electrical-resistance contacts, both sides of the composite sensors were painted with silver (Ag) paste. All the sensors showed reductions in the direct current (DC) resistance ‘R’ with an increment in external uniaxial applied pressure. However, it was observed that higher fabrication pressure led to a lower resistance value of the composite, while the thicker samples give lower electrical conductivity and higher resistance than the thinner samples. The experimental data for all composite pressure sensors were in excellent agreement with the simulated results.

scholarly journals INVESTIGATION OF COMPOSITE METAL MATRIX REINFORCED WITH CARBON NANOTUBES

2021 ◽  
Vol 21 (3) ◽  
pp. 221-229
Author(s):  
Merivt Mahdi Hanoos
Keyword(s):  
Carbon Nanotubes ◽  
Metal Matrix ◽  
Solution Heat Treatment ◽  
Base Alloy ◽  
Hardness Test ◽  
Wear Properties ◽  
Detailed Characterization ◽  
Weight Percentage ◽  
Test Increase

This work focuses on studying the effect of adding nanoparticles on the mechanical properties of the alloy (Al-4%Si) reinforced with carbon nanotube at a different weight percentage (0.25,0.5 and 1%wt). prepared the base alloy and the reinforced materials in a casting followed by solution heat treatment in the furnace at temperature 520ºC for 2 hr. , then artificially aged immediately at the temperature of 185 Co for (2-8 hr.). A detailed characterization of the composite metal matrix structure has performed using XRD, microhardness and wear rate measurements. The results demonstrated that the values of the hardness test increase with an increasing weight percentage of CNTs, this enhancement wear properties of the base alloy reinforced for all percentage of carbon nanotubes additive especially at the weight percentage of 0.5%.

Synthesis and Characterization of Silica Coated Carbon Nanotubes-Alumina Composite Ceramics

2014 ◽  
Vol 703 ◽  
pp. 106-109
Author(s):  
Sheng Hao Meng ◽  
Jun Yan ◽  
Hong Guang Li ◽  
Shi Guo Du
Keyword(s):  
Carbon Nanotubes ◽  
Alumina Ceramic ◽  
Synthesis And Characterization ◽  
Composite Ceramics ◽  
Alumina Composite ◽  
Coated Carbon ◽  
Scanning Electron ◽  
Main Material

Silica-coated carbon nanotubes compounds were synthesized through coating silica nanoparticles on the surface of carbon nanotubes, by peptization and reflux method with tetraethoxy silicone as a main material. Silica coated carbon nanotubes-alumina composite ceramics were synthesized by adding the SiO2/CNTs compounds to the alumina ceramic. The surface of composite ceramics were observed by scanning electron microscope (SEM), the coated nanotubes exhibit better dispersion in the alumina substrate over uncoated and play a role of bridging the alumina grains.

scholarly journals Pressure Sensitive Sensors Based on Carbon Nanotubes, Graphene, and Its Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Asar Ali ◽  
Adam Khan ◽  
Kh. S. Karimov ◽  
Amjad Ali ◽  
Adnan Daud Khan
Keyword(s):  
Carbon Nanotubes ◽  
Reasonable Agreement ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Optical And Electrical Properties ◽  
Electromechanical Properties ◽  
Percentage Decrease ◽  
Graphene Composite ◽  
Pressure Sensitive ◽  
Sandwich Type

Carbon nanotubes (CNTs) and graphene have attracted a great deal of interest due to their outstanding mechanical, optical, electrical, and structural properties. Most of the scientists and researchers have investigated the optical and electrical properties of these materials. However, due to unique electromechanical properties of these materials, it is required to explore the piezoresistive properties of bulk nanostructured CNTs, graphene, and CNT-graphene composites. We investigated and compared the sensitivities and piezoresistive properties of sandwich-type pure CNT, pure graphene, and CNT-graphene composite pressure sensors. For all the samples, increase in pressure from 0 to 0.183 kNm−2 results in a decrease in the impedance and direct current (DC) resistance. Sensitivity and percentage decrease in resistance and impedance of CNT-graphene composite were lower than pure CNT while being higher than pure graphene based sample. Moreover, under the same external applied pressure, the sensitivity and percentage decrease in impedance for pure CNT, pure graphene, and CNT-graphene composite were smaller than the corresponding sensitivity and percentage decrease in resistance. The achieved experimental results of the composite sample were compared with simulated results which exhibit reasonable agreement with each other. The deviations of simulated resistance-pressure and impedance-pressure curves from experimental graphs were 0.029% and 0.105%, respectively.

Synthesis and Characterization of CNT/Fe3O4-ZnS Nanocomposites

2013 ◽  
Vol 750-752 ◽  
pp. 160-163
Author(s):  
Guang Tao Wu ◽  
Jing Li ◽  
Xiu Ming Li ◽  
Hong Wei Zhang ◽  
Yun Feng Dong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Wastewater Treatment ◽  
Electronic Devices ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Sphalerite Structure ◽  
Zns Nanoparticles ◽  
X Ray ◽  
Electronic Microscope

ZnS was coated on carbon nanotubes (CNTs) that had been previously functionalized with Fe3O4 nanoparticles. The as-synthesized products were characterized by X-ray diffraction (XRD), transmission electronic microscope (TEM) and physical properties measurement system (PPMS). ZnS nanoparticles with sphalerite structure are successfully assembled on the surface of CNTs/Fe3O4 nanocomposites. The CNTs/Fe3O4-ZnS nanocomposites exhibit superparamagnetic behavior with saturation magnetization of 21.25emug1. The as-synthesized nanocomposites have great potential for applications in the field of wastewater treatment, electronic devices, sensors and biotechnology.

scholarly journals Synthesis of ultrathin rhenium disulfide nanoribbons using nano test tubes

Nano Research ◽  
2021 ◽  
Author(s):  
Luke T. Norman ◽  
Johannes Biskupek ◽  
Graham A. Rance ◽  
Craig T. Stoppiello ◽  
Ute Kaiser ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Sulfide ◽  
Analytical Approach ◽  
Bulk Material ◽  
Electronic Devices ◽  
Single Walled Carbon Nanotubes ◽  
Electronic Interactions ◽  
Low Dimensional ◽  
Walled Carbon Nanotubes

AbstractThe synthesis of ultrathin rhenium disulfide (ReS2) nanoribbons within single-walled carbon nanotubes (SWNTs) has been established. Dirhenium decacarbonyl complex is encapsulated into the SWNTs to provide a source of confined rhenium atoms, which readily react with iodine to form discrete nm-sized clusters of rhenium iodide [Re6I14]2− embedded in the nanotubes. The final step of the synthesis is accomplished by admitting hydrogen sulfide gas into nano test tubes, yielding twisted nanoribbons of rhenium disulfide encapsulated in carbon nanotubes, ReS2@SWNTs. The width, structure, and composition of rhenium disulfide nanoribbons are strictly controlled by the extreme confinement of the host-SWNT. A holistic analytical approach combining complementary imaging and analysis methods is used at each synthetic step to elucidate the structure and composition of the guest material and reveal the role of the SWNT contributing towards the electronic interactions with encapsulated inorganic structures. As ReS2 nanoribbons are expected to retain the electronic properties of the bulk material, such as direct bandgap, the low dimensional form of this material can be of interest for use in nanoscale electronic devices.

Digital x-ray mapping of nanometer-size supported bimetallic catalysts

1988 ◽  
Vol 46 ◽  
pp. 530-531
Author(s):  
L. T. Germinario
Keyword(s):  
Background Radiation ◽  
Metal Cluster ◽  
Single Element ◽  
Beam Diameter ◽  
X Rays ◽  
X Ray ◽  
Major Interest ◽  
Induced Changes

Understanding the role of metal cluster composition in determining catalytic selectivity and activity is of major interest in heterogeneous catalysis. The electron microscope is well established as a powerful tool for ultrastructural and compositional characterization of support and catalyst. Because the spatial resolution of x-ray microanalysis is defined by the smallest beam diameter into which the required number of electrons can be focused, the dedicated STEM with FEG is the instrument of choice. The main sources of errors in energy dispersive x-ray analysis (EDS) are: (1) beam-induced changes in specimen composition, (2) specimen drift, (3) instrumental factors which produce background radiation, and (4) basic statistical limitations which result in the detection of a finite number of x-ray photons. Digital beam techniques have been described for supported single-element metal clusters with spatial resolutions of about 10 nm. However, the detection of spurious characteristic x-rays away from catalyst particles produced images requiring several image processing steps.

Consideraciones en torno a la reducción solipsista

1970 ◽  
Vol 11 ◽  
Author(s):  
Natalia Carolina Petrillo

ResumenEn el presente trabajo se intentará mostrar que la fenomenología no conduce a una postura solipsista. Para ello, se caracterizará en qué consiste el solipsismo. Luego, se intentará refutar a lo que se ha de llamar “solipsismo metafísico” y “solipsismo gnoseológico”, con el objetivo principal de poner de manifiesto el fundamento de motivación para la salida de la ficción solipsista.Palabras claves:Phenomenology – solipsim – empatía - HusserlAbstractWith the aim of showing that phenomenology does not lead in solipsism, I will first attempt a characterization of it. Then, I will attempt a refutation of the so-called “metaphysical” and “epistemological” solipsisms. Finally, the nature and role of Husserl´s solipsistic fiction is examined, and the grounds that motivate the overcoming of this standpoint are disclosed.key wordsFenomenología – solipsismo - empathy – Husserl

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