Studies of Multiwall Carbon Nanotubes Using Raman Spectroscopy and Atomic Force Microscopy

2004 ◽  
Vol 99-100 ◽  
pp. 265-268 ◽  
Author(s):  
M. Zdrojek ◽  
W. Gebicki ◽  
C. Jastrzebski ◽  
T. Melin ◽  
A. Huczko
Keyword(s):  
Carbon Nanotubes ◽  
Low Frequency ◽  
Multiwall Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Force Microscopy ◽  
Disorder Effects ◽  
Atomic Force ◽  
New Feature ◽  
Single Wall Nanotubes ◽  
Multiwall Carbon

Preliminary results of Raman scattering measurements of multiwall carbon nanotubes (MWCNT) are presented. The nanotubes have been carefully dissolved, separated and then characterized by AFM. The micro-Raman spectra are taken with 514,5nm wavelength excitations in the range 4K - 400K. Basically the spectra are quite similar to the well known single wall carbon nanotube spectra, but the low frequency band is absent. The major Raman bands, observed in single wall nanotubes are found in the spectra. In particular the disorder effects are visible due to the pronounced D band at ~1350 cm-1. Metallic and semiconducting type of conductivity is distinguished through analysis of the G (LO) mode at ~1600 cm-1. A new feature in these spectra exists at ~843 cm-1. Low energy radial breathing mode absence has been explained.

Deposition of Multiwall Carbon Nanotubes Using Low Frequency Alternating Electrophoretic Deposition

2009 ◽  
Vol 412 ◽  
pp. 83-86 ◽  
Author(s):  
Amir Reza Gardeshzadeh ◽  
Babak Raissi ◽  
Ehsan Marzbanrad
Keyword(s):  
Carbon Nanotubes ◽  
Electric Fields ◽  
Electrophoretic Deposition ◽  
Low Frequency ◽  
Multiwall Carbon Nanotubes ◽  
Deposition Pattern ◽  
Ac Electric Fields ◽  
Rectangular Waveform ◽  
Multiwall Carbon ◽  
Deposit Yield

In this paper, electrophoretic deposition of multiwall carbon nanotubes (MWNTs) using low frequency (0.01-1000 Hz) AC electric fields, is reported. The effect of depositing parameters such as frequency and waveform on deposit yield is investigated. Results show that the deposit yield decreases with frequency. The rectangular waveform yields more deposit yield than sinusoidal and triangular waveforms. The deposition pattern is also different in AC and DC electric fields. This technique may be used for deposition of MWNTs thick films.

Polymer Functionalized Carbon nanotubes for sensor application

2004 ◽  
Vol 858 ◽  
Author(s):  
Narasimha Harindra Vedala ◽  
Young C. Choi ◽  
X. Y. Zhou ◽  
Gene Kim ◽  
WonBong Choi
Keyword(s):  
Carbon Nanotubes ◽  
Humidity Sensor ◽  
Multiwall Carbon Nanotubes ◽  
Large Change ◽  
Charge Transport Mechanism ◽  
Raman Analysis ◽  
Hydrophilic Surfaces ◽  
Single Wall Nanotubes ◽  
Multiwall Carbon ◽  
Functionalized Nanotubes

ABSTRACTSurface modification of carbon nanotubes with polyvinyl alcohol (PVOH) showed detection for humidity variation implying a possible application as a nanoscale humidity sensor. Wettability studies on single-wall, Y junction single wall and multiwall carbon nanotubes revealed that these nanotubes tend to become highly hydrophilic surfaces by this functionalisation. From the raman analysis it was determined that the majority of the nanotubes in our Y-junction single wall nanotubes were semiconducting in nature. The conductivity studies revealed that the Y junction nanotubes with PVOH functionalisation show large change in conductivity for varying relative humidity (RH). We propose a possible charge transport mechanism in these functionalized nanotubes.

Outstanding dielectric constant and piezoelectric coefficient in electrospun nanofiber mats of PVDF containing silver decorated multiwall carbon nanotubes: assessing through piezoresponse force microscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6251-6258 ◽  
Author(s):  
Maya Sharma ◽  
Vijay Srinivas ◽  
Giridhar Madras ◽  
Suryasarathi Bose
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Piezoelectric Coefficient ◽  
Multiwall Carbon Nanotubes ◽  
Piezoresponse Force Microscopy ◽  
Electrospun Nanofiber ◽  
Force Microscopy ◽  
Nanofiber Mats ◽  
Multiwall Carbon

Alignment of dipoles in one direction leads to high piezoelectric coefficient in PVDF/Ag decorated CNTs.

Fabrication of ball-shaped atomic force microscope tips by ion-beam-induced deposition of platinum on multiwall carbon nanotubes

2009 ◽  
Vol 110 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Yung Ho Kahng ◽  
Jinho Choi ◽  
Kwanghoon Jeong ◽  
Byong Chon Park ◽  
Dal-Hyun Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Force Microscope ◽  
Ion Beam ◽  
Multiwall Carbon Nanotubes ◽  
Atomic Force ◽  
Multiwall Carbon

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

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