scholarly journals Novel Method of Evaluating the Purity of Multiwall Carbon Nanotubes Using Raman Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Young Chul Choi ◽  
Kyoung-In Min ◽  
Mun Seok Jeong
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Reference Material ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Excitation Wavelength ◽  
Established Method ◽  
Carbon Particles ◽  
Novel Method ◽  
Multiwall Carbon

We propose the quantitative method of evaluating the purity of multiwall carbon nanotubes (MWCNTs) using Raman spectroscopy. High purity MWCNTs were prepared by chemical vapor deposition (CVD) to be used as a reference material with 100% purity. Since the intensity and wavenumber ofD′′-band located at around 1500 cm−1were found to be independent of the excitation wavelength of a laser, the purity of MWCNTs was measured by comparing the intensity ratio ofD′′-band toG-band (ID′′/IG) of the sample with that of a reference material. The established method was verified by testing the mixture of amorphous carbon particles and reference MWCNTs.

Chemical vapor deposition of nickel-group metals on multiwall carbon nanotubes

2007 ◽  
Vol 85 (10) ◽  
pp. 645-650 ◽  
Author(s):  
Maoqi Feng ◽  
Richard J Puddephatt
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Low Temperature ◽  
Vapor Deposition ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Pt Films ◽  
Bimetallic Films ◽  
Multiwall Carbon

Chemical vapor deposition (CVD) of Ni, Pd, and Pt films and of Ni/Pd and Pd/Pt bimetallic films on multiwall carbon nanotubes (MWCNTs) can be effected at low temperature if the nanotubes are pretreated by CVD of titanium carbide. In the absence of the pretreatment, the CVD leads to formation of isolated nanoparticles of the nickel-group metals. The metallized MWCNTs are curved or kinked, as a result of the interaction with the metal. Preliminary oxidation of the carbon nanotubes allows easier metallization, and the bending of the metallated nanotubes is not observed in this case.Key words: Chemical vapor deposition, platinum, palladium, nickel, carbon, nanotube.

Optimization of Chemical Vapor Deposition Synthesis Conditions for Multiwall Carbon Nanotube by Statistical Analysis of Experiment

2008 ◽  
Vol 55-57 ◽  
pp. 533-536
Author(s):  
P. Saiprasert ◽  
D. Koolpiruck ◽  
S. Chiangga
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Multiwall Carbon Nanotubes ◽  
Statistical Design ◽  
Chemical Vapor ◽  
Multiwall Carbon Nanotube ◽  
Synthesis Conditions ◽  
Fourier Transform Raman ◽  
Multiwall Carbon

The optimization of chemical vapor deposition synthesis conditions for multiwall carbon nanotubes (MWCNTs) was experimentally investigated. Carbon nanotubes were grown on cobalt substrate thicknesses of 20, 100 and 1000 nm at 700 and 900 0C with 2 replications. The configuration and morphology of the carbon nanotubes were investigated by scanning electron microscope and Fourier transform raman spectrometer, respectively. The tendency of the parameters was evaluated by statistical design of experiment. Observations on samples produced under our optimised production process, showed that a large number of MWCNTs bundles were produced. Diameter of MWCNTs bundles ranges between 30 and 100 nm throughout the samples. From the variance analysis of the Raman spectra we observe that the thickness of cobalt and temperature of synthesis are highly significant in which the coherence length and innermost diameter increase for either the thickness increases or the temperature decreases.

scholarly journals Source Separation Using Sensor’s Frequency Response: Theory and Practice on Carbon Nanotubes Sensors

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3389 ◽  
Author(s):  
Aurore Quelennec ◽  
Éric Duchesne ◽  
Hélène Frémont ◽  
Dominique Drouin
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Devices ◽  
Source Separation ◽  
Multiwall Carbon Nanotubes ◽  
Measurement Model ◽  
Theory And Practice ◽  
Environment Monitoring ◽  
Frequency Responses ◽  
Novel Method ◽  
Multiwall Carbon

Nowadays, there is an increased demand in integrated sensors for electronic devices. Multi-functional sensors provide the same amount of data using fewer sensors. Carbon nanotubes are non-selectively sensitive to temperature, gas and strain. Thus, carbon nanotubes are perfect candidates to design multi-functional sensors. In our study, we are interested in a dual humidity-temperature sensor. Here, we present a novel method to differentiate at least two sources using the sensor’s frequency responses based on multiwall carbon nanotubes sensors. The experimental results demonstrate that there are temperature- or moisture-invariant frequencies of the impedance magnitude, and their values depend on the sensor’s geometry. The proposed measurement model shows that source-invariant frequencies of the phase can be also determined. In addition, the source separation method is generalized to other materials or sources enabling multi-functional sensors for environment monitoring.

Diffusion of Multiwall Carbon Nanotubes into Industrial Polymers

2019 ◽  
Vol 23 ◽  
pp. 213-221
Author(s):  
Ponnusamy Senthil Kumar ◽  
A. Saravanan
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Polymer Chains ◽  
Carbon Particles ◽  
Mechanical Quality ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Weight Proportion ◽  
Carbon Molecule

Carbon nanotubes (CNTs) are made out of carbon atoms connected in hexagonal shapes, with every carbon molecule covalently attached to three other carbon particles. The properties of nanotubes have made scientists and organizations think about utilizing them in many fields. For instance, since carbon nanotubes have the most noteworthy quality to-weight proportion of any known material. Nanocomposites of adjusted multi walled carbon nanotubes (MWCNTs) installed in a polymer matrix yield a one of a kind mix of warm and electrical properties and mechanical quality. The composites combine the vast pseudo capacitance of the directing polymers with the quick charging/releasing two-fold film impedance and incredible machine-driven possessions of the carbon nanotubes. The electrochemically co-stored composites are the most homogeneous and demonstrate an unordinary communication between the polymer and nanotubes, offering ascend to a reinforced electron delocalisation and conjugation along the polymer chains

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