Multiwall carbon nanotubes purification and oxidation by nitric acid studied by the FTIR and electron spectroscopy methods

Stobiński, Leszek; Lesiak, B.; Kövér, L.; Tóth, J.; Biniak, S.; Trykowski, Grzegorz; Judek, Jarosław

doi:10.1016/j.jallcom.2010.04.032

Cited by 510 publications

(287 citation statements)

References 32 publications

Supporting

Mentioning

251

Contrasting

Unclassified

Order By: Relevance

“…It is also observed from Figure 3(b) that the individual nanotubes are clearly visible after acid functionalization, being easier to differentiate from one to another. It is expected that acid functionalization also dissolve eventual amorphous regions present in the MWCNT 42,43 . Samples of TiO 2 -coated MWCNT, obtained after the sol-gel process using different titanium isopropoxide (TTIP) to H 2 O molar ratios, are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

2017

View full text Add to dashboard Cite

In recent years, efforts in developing high strength-low density materials are increasing significantly. One of the promising materials to attend this demand is the carbon nanotube (CNT), to be used mainly as a reinforcing phase in lightweight metal matrix composites (MMC). In the present work, the sol-gel technique has been employed to obtain TiO 2 coating on the surface of commercial multiwall carbon nanotubes (MWCNT). The aim of such coating is to improve the thermal stability of MWCNT in oxidize environment, which is necessary in most of MMC processing routes. Calcination in inert atmosphere was performed in order to crystallize a stable coating phase. The hybrid CNT/TiO 2 nanocomposite was characterized by X-Ray Diffractometry (XRD), Raman spectroscopy, Thermogravimetry (TGA) and Field Emission Gun -Scanning Electron Microscopy (FEG-SEM). The coating structure was observed to change from anatase to rutile, as the calcination temperature increases from 500 to 1000ºC. Results from thermogravimetric analysis showed that the samples calcined at 1000 ºC were more resistant to oxidation at high temperatures.

show abstract

Section: Resultsmentioning

confidence: 99%

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

2017

View full text Add to dashboard Cite

show abstract

“…Both peaks centred at 1380 and 2920 cm -1 are assigned as bending and stretching vibrations of C-H. The intense bands at 3400 cm −1 indicate stretching vibrations of isolated surface -OH moieties and/or -OH in carboxyl groups in absorbed water [29]. From FTIR spectra we can conclude the oxygen functional groups are attached to the carbon in the ICNS film, changing the surface wettability of the sample.…”

Section: Accepted M Manuscriptmentioning

confidence: 86%

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

et al. 2016

View full text Add to dashboard Cite

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

show abstract

“…is attributed to C=O bands characteristic of carboxyl functional groups (-COOH) and of ketone/quinine [14][15][16]. It has also been reported [13] that the band in the range of 1590-1570 cm −1 can be assigned to a combined band due to the aromatic ring mode of conjugated systems (diketone, ketoester, and carboxylate structures) and the absorption band at 1150 cm -1 is assigned to -C-O and -OH bonds in ether lactones, carboxyl, and phenolic structures.…”

Section: Methodsmentioning

confidence: 99%

Effect of surface modification of carbon felts on capacitive deionization for desalination

Lee¹,

Ahn²,

Cho³

et al. 2015

Carbon letters

View full text Add to dashboard Cite

Surface modified carbon felts were utilized as an electrode for the removal of inorganic ions from seawater. The surfaces of the carbon felts were chemically modified by alkaline and acidic solutions, respectively. The potassium hydroxide (KOH) modified carbon felt exhibited high Brunauer-Emmett-Teller (BET) surface areas and large pore volume, and oxygencontaining functional groups were increased during KOH chemical modification. However, the BET surface area significantly decreased by nitric acid (HNO 3 ) chemical modification due to severe chemical dissolution of the pore structure. The capability of electrosorption by an electrical double-layer and the efficiency of capacitive deionization (CDI) thus showed the greatest enhancement by chemical KOH modification due to the appropriate increase of carboxyl and hydroxyl functional groups and the enlargement of the specific surface area.

show abstract

Multiwall carbon nanotubes purification and oxidation by nitric acid studied by the FTIR and electron spectroscopy methods

Cited by 510 publications

References 32 publications

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

Production of TiO2 Coated Multiwall Carbon Nanotubes by the Sol-Gel Technique

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

Effect of surface modification of carbon felts on capacitive deionization for desalination

Contact Info

Product

Resources

About