Polymer Functionalized Carbon nanotubes for sensor application

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.

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.99-100.265 ◽

2004 ◽

Vol 99-100 ◽

pp. 265-268 ◽

Cited By ~ 51

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.

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Development and application of a digestion-Raman analysis approach for studying multiwall carbon nanotube uptake in lettuce

Environmental Science Nano ◽

10.1039/c7en01047h ◽

2018 ◽

Vol 5 (3) ◽

pp. 659-668 ◽

Cited By ~ 6

Author(s):

Kamol K. Das ◽

Yaqi You ◽

Miguel Torres ◽

Felipe Barrios-Masias ◽

Xilong Wang ◽

...

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Nitric Acid ◽

Multiwall Carbon Nanotubes ◽

Analysis Approach ◽

Multiwall Carbon Nanotube ◽

Raman Analysis ◽

Multiwall Carbon

Optimized plant digestion using nitric acid in conjunction with Raman analysis is an effective approach for detecting and analyzing multiwall carbon nanotubes in lettuce plants.

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Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

10.26434/chemrxiv.6652955.v1 ◽

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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