RETRACTED: Fast functionalization of vertically aligned multiwalled carbon nanotubes using oxygen plasma

Lobo, Anderson Oliveira; Ramos, Susana; Antunes, E.F.; Marciano, Fernanda Roberta; Trava-Airoldi, V.J.; Corat, Evaldo José

doi:10.1016/j.matlet.2011.11.071

Cited by 93 publications

(64 citation statements)

References 30 publications

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“…After the water plasma treatment I and D´´ bands become more prominent. The enlargement of the D´´band is in agreement with the expected attachment of polar groups on the CNTs surfaces [42,43]. The area of the D´´peak increases from 170 to 547 and the I D´´/ I G ratio from 0.46 to 0.62, for untreated CNTsQF and wp-CNTsQF, respectively.…”

Section: Raman Spectroscopysupporting

confidence: 84%

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Amade

Hussain²,

Romero‐Ocaña³

et al. 2014

J Environ Eng Ecol Sci

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Background: Air pollution has become an important issue worldwide due to its adverse health effects. Among the different air contaminants, volatile organic compounds (VOCs) are liquids or solids with a high vapor pressure at room temperature that are extremely dangerous for human health. Removal of these compounds can be achieved using nanomaterials with tailored properties such as carbon nanotubes. Methods: Vertically-aligned multiwall carbon nanotubes (CNTs) were successfully grown on quartz filters by means of plasma enhanced chemical vapor deposition (PECVD). Furthermore, a plasma treatment was performed in order to modify the surface properties of the CNTs. The adsorption/desorption processes of three chlorinated compounds (trichloroethylene, 1,2-dichlorobenzene and chloroform) on the CNTs were studied using mass spectrometry measurements with a residual gas analyzer. Results: The adsorption capability of the CNTs increased after functionalization of their surface with a water plasma treatment. In addition, it was found that the presence of aromatic rings, water solubility and polarity of the VOCs play an important role on the adsorption/desorption kinetics at the CNTs surface. Conclusions: This study demonstrates the applicability of CNTs deposited on quartz filters for the removal or selective detection of volatile organic compounds (VOCs). The presence of aromatic rings in VOCs results in π-stacking interactions with a significant increase of their adsorption. On the other hand, it was found that CNTs surface interactions increase with water solubility and polarity of the VOC.

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Section: Raman Spectroscopysupporting

confidence: 84%

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Amade

Hussain²,

Romero‐Ocaña³

et al. 2014

J Environ Eng Ecol Sci

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“…The small peak at around 1060 cm −1 (T-peak) reveals a slight content of sp 3 carbon [22], which only could be detected by UV excitation (Fig 3 (b)). The band centred at around 1489 cm -1 appears on all Raman spectra and is evidence of oxygen functional groups bonded to carbon on ICNSs [23]. In summary, Raman analyses indicate mainly the presence of highly crystalline carbon, such as graphene, together with oxygen groups attached to the surface.…”

Section: Structural Characterisation Of the Icns Layermentioning

confidence: 81%

“…2 carbon nanostructures, carbon nanospheres (CNSs) have attracted much attention because of their applications in electronic devices, catalysis, adsorbents and as anode materials in lithium-ion batteries [18][19][20][21][22][23][24][25]. To date, most of these carbon nanospheres are hollow carbon structures composed of stacked hexagonal graphene sheets linked as rings.…”

Section: Among These Various Spmentioning

confidence: 99%

Fast electron transfer kinetics on novel interconnected nanospheres of graphene layers electrodes

et al. 2016

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ÔØ Å ÒÙ× Ö ÔØ A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Abstract

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“…Superhydrophilic VACNT were obtained after a simple functionalization of the VACNT tips using a pulsed-direct current plasma reactor with an oxygen flow. More details in references [8,9]. The electrodeposition of the HA crystals on the superhydrophilic VACNT films was performed using 0.042 molL-1 Ca(NO3)2.4H2O + 0.025 molL-1 (NH4).2HPO4 electrolytes (pH=4.7).…”

Section: Methodsmentioning

confidence: 99%

Characterization and bioactivity study of nanohydroxyapatite on superhydrophilic vertically aligned carbon nanotubes using optical techniques

et al. 2012

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Vertically-aligned multi-walled carbon nanotubes (VACNT) is of particular interest in regenerative medicine. Templateinduced hydroxyapatite (HA) has broad prospects in applied fields of bone regenerative medicine. Thus, it becomes very attractive a combination these two excellent materials to bone tissue engineering applications. In this study the HA/VACNT nanocomposites were used as scaffolds to Human osteoblast cells culture. Superhydrophilic VACNT films were obtained by CVD method and funcionalized by oxygen plasma. The fabrication of HA/VACNT nanocomposites was performed with a direct electrodeposition of the thin HA films on the VACNT films. The bioactivity and biomineralization in vitro process of superhydrophilic HA/VACNT nanocomposites were investigated using simulated body fluid (SBF) and optical techniques. The characterization of of HA/VACNT nanocomposites was performed before and after soaking 21 days in SBF and compared to superydrophilic VACNT films. Fourier transform infrared spectroscopy, micro X-ray fluorescence spectrometer by energy-dispersive and X-ray difractogram were employed to investigate the structural and chemical properties. The morphology was investigated by FEG-SEM analysis. After 21 days was identified that others biological apatites were formed only on HA/VACNT nanocomposites. Optical techniques showing a powerful tool to characterizated and investigated the bioactivity in vitro process. These findings were very atractive to application of this new nanocomposite to bone tissue regeneration.

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RETRACTED: Fast functionalization of vertically aligned multiwalled carbon nanotubes using oxygen plasma

Cited by 93 publications

References 30 publications

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Fast electron transfer kinetics on novel interconnected nanospheres of graphene layers electrodes

Characterization and bioactivity study of nanohydroxyapatite on superhydrophilic vertically aligned carbon nanotubes using optical techniques

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