Influence of acid treatments of carbon nanotube precursors on Ni/CNT in the synthesis of carbon nanotubes

2005 ◽  
Vol 230 (1-2) ◽  
pp. 17-22 ◽  
Author(s):  
Huaping Liu ◽  
Guoan Cheng ◽  
Ruiting Zheng ◽  
Yong Zhao ◽  
Changlin Liang
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Synthesis Of Carbon Nanotubes ◽  
Acid Treatments

Synthesis of Carbon Nanotubes from Silicalite-1-Coated Substrates

2012 ◽  
Vol 512-515 ◽  
pp. 275-279
Author(s):  
Wei Zhao ◽  
Ashish Pokhrel ◽  
Hyun Sung Kim ◽  
Hyung Tae Kim ◽  
Ik Jin Kim
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Iron Oxide ◽  
Vapor Deposition ◽  
Rf Sputtering ◽  
Chemical Vapor ◽  
Confined Spaces ◽  
Synthesis Of Carbon Nanotubes ◽  
Si Wafer

Assembled monolayer of silicalite-1 (AMS) microcrystals on Si wafer for carbon nanotube (CNT) growth has been prepared by the rubbing method. Iron oxide (α-Fe2O3, hematite) catalyst films were deposited onto silicate-1 monolayers from a Fe2O3 target by radio frequency (rf)-sputtering. This approach has the potential for producing well-aligned CNTs with controlled diameter from predesigned silicalite-1 templates by catalytic chemical vapor deposition (CCVD). Silicalite-1 monolayer oriented with faces parallel to Si wafer showed only the planes in the forms {0 k 0} lines at (020), (040), (060), (080) and (0100) by XRD. The formation and growth of CNTs by CCVD were achieved on the pores of silicate-1 crystals whereby the pores can be defined as confined spaces (channels, 5.60 Å) in nanometer dimensions acting as a template for a fine dispersion of well-defined Fe2O3 (10-15 nm) particles.

Carbon Nanotubes with Special Structure from the Pyrolysis Flame

2011 ◽  
Vol 261-263 ◽  
pp. 909-912
Author(s):  
Yuan Chao Liu ◽  
Ya Jie Zhang ◽  
Ya Jun Wu ◽  
Bao Min Sun
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Carbon Nanofiber ◽  
Catalyst Particle ◽  
Special Structure ◽  
Key Factors ◽  
Catalyst Particle Size ◽  
Transmission Electron ◽  
The One ◽  
Synthesis Of Carbon Nanotubes

Carbon nanotube is the one-dimensional carbon nano-materials. The synthesis of carbon nanotubes from pyrolysis flame is a new method. Variety of carbon nanotubes with special structure can be seen from pyrolysis flame due to the influence of key factors such as the concentration of reactants and catalyst particle size. The morphology and structural of carbon nanotubes were characterized by scanning electron microscope and transmission electron microscopy respectively. Carbon nanotubes with special structure such as bamboo-like, pod-like and coil-like can be seen in the experiment. The bamboo-like carbon nanotube has a bamboo-like structure clearly. The shape of pod-like carbon nanotube is very similar with the peasecod. The coil-like carbon nanotube is similar to carbon nanofiber in structure. It was discussed and analyzed that the formation mechanism of bamboo-like, pod-like and coil-like carbon nanotubes from the V-type pyrolysis flame.

scholarly journals Chemical Surface Modification of CNTs via Three Oxidative Acid Treatments

2015 ◽  
Vol 1107 ◽  
pp. 320-325
Author(s):  
Bryan Gindana ◽  
Arvyvie Abie Jamil ◽  
Brian Brandon Bernard ◽  
Florinna Tan ◽  
M.A. Siti Aishah ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Carbon Nanotube ◽  
Chemical Surface ◽  
Stable Dispersion ◽  
Chemical Surface Modification ◽  
Multi Walled Carbon Nanotubes ◽  
Dispersing Ability ◽  
Walled Carbon Nanotubes ◽  
Acid Treatments

Carbon nanotubes are commonly used to create polymer-nanotube composite for various applications. To suffice the needs of the emerging interest in utilizing nanotube, a great concern in creating a stable dispersion of the nanotube in solvent emerged. There is a paramount need to enhance the adhesion between the polymer and carbon nanotube to give a homogenous and stable dispersion throughout the polymer matrix. Thus, oxidative acid treatments are often chosen to chemically functionalize carbon nanotube in order to give such dispersing ability to the nanomaterials. In this study, purified multi-walled carbon nanotubes (MWCNTs) is oxidized under the influence of three types of oxidants i) hydrogen peroxide, ii) citric acid monohydrate and iii) mixture of 3:1 sulphuric and nitric acid. All the MWCNTs suspensions ultrasonicated for 8 hours to create opening defects on the MWCNTs to allow the surface modification to occur. In this comparative study of chemically surface modification using oxidative acid treatments, FTIR was used to examine the formation of -OH, -COOH and -C=O groups on the surface of the MWCNTs, TGA and XRD used to determine the thermal behaviour and the crystal structure studies of the modified MWCNTs respectively.

scholarly journals Review: Sintesis Carbon Nanotubes (CNT) dari Bahan Terbarukan untuk Komposit Carbon Nanotube-Polyaniline

2021 ◽  
Vol 6 ◽  
pp. 9
Author(s):  
Ayu Miftachul Jan'ah ◽  
Teguh Endah Saraswati
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Palm Kernel ◽  
Coconut Oil ◽  
Renewable Materials ◽  
Plant Materials ◽  
Polyaniline Composites ◽  
Coconut Shells ◽  
Synthesis Of Carbon Nanotubes ◽  
Palm Kernel Shells

<p>Artikel ini berisi tentang sintesis <em>carbon nanotubes</em> (CNT) dari material tanaman sebagai upaya untuk mengurangi penggunaan bahan kimia dan pemanfaatan bahan terbarukan. CNT telah berhasil disintesis dari prekursor tanaman seperti cangkang sawit, minyak sawit, bambu, kayu karet, jerami padi, batok kelapa, serat kelapa dan minyak kelapa. Sifat unik dari CNT menyebabkan penelitiannya terus dilakukan dan banyak diterapkan dalam berbagai aplikasi salah satunya material komposit. CNT yang telah disintesis dapat dikompositkan dengan <em>polyaniline</em> (PANI) untuk memperoleh konduktivitas, sifat optik, dan kekuatan mekanik yang lebih unggul. </p><p><strong><em>Review: Synthesis of Carbon Nanotubes (CNT) from Renewable Materials for Carbon Nanotube-Polyaniline Composites. </em></strong>This article contains the synthesis of carbon nanotubes (CNT) from plant materials in an effort to reduce the use of chemicals and the use of renewable materials. CNT has been successfully synthesized from plant precursors such as palm kernel shells, palm oil, bamboo, rubberwood, rice straw, coconut shells, coconut fiber, and coconut oil. The unique properties of CNT have led to continuous research and many applications in various applications, one of which is composite materials. The synthesized CNTs can be composite with polyaniline (PANI) to obtain superior conductivity, optical properties, and mechanical strength.</p>

Flame Synthesis of Carbon Nanotubes: Premixed and Diffusion Flame Configurations Illustrating Roles of Gas Composition and Catalyst

2013 ◽  
Vol 1506 ◽  
Author(s):  
Randy L. Vander Wal
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Diffusion Flames ◽  
Flame Synthesis ◽  
Gas Composition ◽  
Parameter Spaces ◽  
Carbon Nanotube Synthesis ◽  
Synthesis Of Carbon Nanotubes ◽  
And Diffusion ◽  
Key Parameter

ABSTRACTIllustrated in this talk will be the use of premixed and diffusion flames as reaction environments for carbon nanotube synthesis. We have tested both systems using catalysts as aerosols and supported upon substrates. Highlights will be shown demonstrating success and further challenges. For illustration, this abstract illustrates two key parameter spaces, namely gas composition and catalyst size and composition in premixed and diffusion flames, respectively.

scholarly journals Acoustic-assisted assembly of an individual monochromatic ultralong carbon nanotube for high on-current transistors

2016 ◽  
Vol 2 (11) ◽  
pp. e1601572 ◽  
Author(s):  
Zhenxing Zhu ◽  
Nan Wei ◽  
Huanhuan Xie ◽  
Rufan Zhang ◽  
Yunxiang Bai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
High Performance ◽  
Areal Density ◽  
High Density ◽  
Great Effort ◽  
Controllable Synthesis ◽  
Expected Performance ◽  
Synthesis Of Carbon Nanotubes

Great effort has been applied to scientific research on the controllable synthesis of carbon nanotubes (CNTs) with high semiconducting selectivity or high areal density toward the macroscale applications of high-performance carbon-based electronics. However, the key issue of compatibility between these two requirements for CNTs remains a challenge, blocking the expected performance boost of CNT devices. We report an in situ acoustic-assisted assembly of high-density monochromatic CNT tangles (m-CNT-Ts), consisting of one self-entangled CNT with a length of up to 100 mm and consistent chirality. On the basis of a minimum consumed energy model with a Strouhal number of approximately 0.3, the scale could be controlled within the range of 1 × 104 to 3 × 104 μm2 or even a larger range. Transistors fabricated with one m-CNT-T showed an on/off ratio of 103 to 106 with 4-mA on-state current, which is also the highest on-state current recorded so far for single CNT–based transistors. This acoustic-assisted assembly of chiral-consistent m-CNT-Ts will provide new opportunities for the fabrication of high-performance electronics based on perfect CNTs with high purity and high density.

Fabrication of Carbon Nanotube Triode Using Helicon Plasma Cvd with Electroplated Nico Catalyst

2003 ◽  
Vol 772 ◽  
Author(s):  
Masakazu Muroyama ◽  
Kazuto Kimura ◽  
Takao Yagi ◽  
Ichiro Saito
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Metal Catalyst ◽  
Ni Catalyst ◽  
Plasma Cvd ◽  
Helicon Plasma ◽  
Plasma Enhanced Cvd ◽  
Turn On ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

AbstractA carbon nanotube triode using Helicon Plasma-enhanced CVD with electroplated NiCo catalyst has been successfully fabricated. Isolated NiCo based metal catalyst was deposited at the bottom of the cathode wells by electroplating methods to control the density of carbon nanotubes and also reduce the activation energy of its growth. Helicon Plasma-enhanced CVD (HPECVD) has been used to deposit nanotubes at 400°C. Vertically aligned carbon nanotubes were then grown selectively on the electroplated Ni catalyst. Field emission measurements were performed with a triode structure. At a cathode to anode gap of 1.1mm, the turn on voltage for the gate was 170V.

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