scholarly journals Water-Dispersible Multiwalled Carbon Nanotubes Obtained from Citric-Acid-Assisted Oxygen Plasma Functionalization

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mohammad Jellur Rahman ◽  
Tetsu Mieno
Keyword(s):  
Carbon Nanotubes ◽  
Citric Acid ◽  
Acid Solution ◽  
Multiwalled Carbon Nanotubes ◽  
Oxygen Plasma ◽  
Surface Defects ◽  
Citric Acid Solution ◽  
Multiwalled Carbon ◽  
Pure Ethanol ◽  
Water Dispersible

A new and safe method has been developed to functionalize multiwalled carbon nanotubes (MWCNTs) with fewer surface defects, which significantly increases their dispersibility in water. MWCNTs are pretreated in pure ethanol by a supersonic homogenizer. Then, the mixture is dried and soaked in weak citric acid solution. Finally, the MWCNTs in the citric acid solution are treated with radio frequency (13.56 MHz) oxygen plasma. As a result, many carboxyl functional groups are attached onto the MWCNT surfaces and stable dispersion of the MWCNTs in water is obtained. The treatment conditions are optimized in this study.

scholarly journals Pt- and Pd-decorated MWCNTs for vapour and gas detection at room temperature

2015 ◽  
Vol 6 ◽  
pp. 919-927 ◽  
Author(s):  
Hamdi Baccar ◽  
Atef Thamri ◽  
Pierrick Clément ◽  
Eduard Llobet ◽  
Adnane Abdelghani
Keyword(s):  
Carbon Nanotubes ◽  
Volatile Organic Compounds ◽  
Multiwalled Carbon Nanotubes ◽  
Organic Compounds ◽  
Room Temperature ◽  
Surface Defects ◽  
Pd Nanoparticles ◽  
Oxygen Plasma Treatment ◽  
Multiwalled Carbon ◽  
Volatile Organic

Here we report on the gas sensing properties of multiwalled carbon nanotubes decorated with sputtered Pt or Pd nanoparticles. Sputtering allows for an oxygen plasma treatment that removes amorphous carbon from the surface of the carbon nanotubes and creates oxygenated surface defects in which metal nanoparticles nucleate within a few minutes. The decoration with the 2 nm Pt or the 3 nm Pd nanoparticles is very homogeneous. This procedure is performed at the device level (i.e., for carbon nanotubes deposited onto sensor substrates) for many devices in one batch, which illustrates the scalability for the mass production of affordable nanosensors. The response to selected aromatic and non-aromatic volatile organic compounds, as well as pollutant gases has been studied. Pt- and Pd-decorated multiwalled carbon nanotubes show a fully reversible response to the non-aromatic volatile organic compounds tested when operated at room temperature. In contrast, these nanomaterials were not responsive to the aromatic compounds studied (measured at concentrations up to 50 ppm). Therefore, these sensors could be useful in a small, battery-operated alarm detector, for example, which is able to discriminate aromatic from non-aromatic volatile organic compounds in ambient.

Fast functionalization of vertically aligned multiwalled carbon nanotubes using oxygen plasma

2012 ◽  
Vol 70 ◽  
pp. 89-93 ◽  
Author(s):  
Anderson Oliveira Lobo ◽  
Sandra Cristina Ramos ◽  
Erica Freire Antunes ◽  
Fernanda Roberta Marciano ◽  
Vladimir Jesus Trava-Airoldi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Oxygen Plasma ◽  
Multiwalled Carbon ◽  
Vertically Aligned

Fullerene (C60) decoration in oxygen plasma treated multiwalled carbon nanotubes for photovoltaic application

2008 ◽  
Vol 92 (6) ◽  
pp. 063508 ◽  
Author(s):  
Golap Kalita ◽  
Sudip Adhikari ◽  
Hare Ram Aryal ◽  
Masayoshi Umeno ◽  
Rakesh Afre ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Oxygen Plasma ◽  
Fullerene C60 ◽  
Multiwalled Carbon ◽  
Photovoltaic Application
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