Oxidative functionalization of carbon nanotubes in atmospheric pressure filamentary dielectric barrier discharge (APDBD)

Okpalugo, T.I.T.; Papakonstantinou, Pagona; Murphy, H.; McLaughlin, James; Brown, N. M. D.

doi:10.1016/j.carbon.2005.06.033

Cited by 142 publications

(79 citation statements)

References 11 publications

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“…Furthermore, the shift in the position and the intensity of the peaks also provides insight into the effect of functionalization. The spectrum also shows several instances of decreased intensities in each band upon the oxidation and functionalization process [38][39][40]. These changes can also be observed within the D and G bands of the graphene.…”

Section: Raman Spectroscopymentioning

confidence: 77%

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

et al. 2015

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Abstract:In the present study, silane-functionalized graphene (f-graphene)-reinforced chitosan nanocomposite films exhibiting enhanced mechanical properties have been prepared by the solution casting method. These nanocomposite films were characterized by X-ray diffraction, Raman spectroscopy and thermogravimetric analysis. In order to investigate the effect of silane functionalization, tensile tests were performed on original, oxidized and silane-functionalized graphene-reinforced chitosan nanocomposite films. Tensile results show that silane functionalization groups offer a substantial increase in the interfacial adhesion between filler and host matrix. This result is also confirmed by the surface morphology of the fracture surface in scanning electron microscope analysis. Qualitative analysis using Raman and Fourier transform infrared spectroscopy revealed the existence of Si-O-Si and Si-O-C bonds in the silanized composite. Thermal analysis of the samples shows that the material is stable up till 250 °C and maintains its thermal stability all throughout the process until it starts degrading after 510 °C. Atomic force microscopy reveals that the material is well exfoliated after the oxidation of graphene and also displays the existence of 3-6 layers of exfoliated graphene sheets. X-ray photoelectron spectroscopy studies also reveal the existence of silicon in the single state and quantify the sample to be approximately around 4% (±0.5%) of the total atomic weight. OPEN ACCESSPolymers 2015, 7 528

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Section: Raman Spectroscopymentioning

confidence: 77%

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

et al. 2015

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“…This is attributed to the earlier decomposition of the grafted carboxylic groups on the nanotubes. For example, the decomposition of the pristineMWCNTs occur (TGA under flowing nitrogen, temperature range of 90-860 °C, at rate of 15 °C/min) at the onset temperature of 639 °C while of o-MWCNTs, it occurs at 627 °C (Okpalugo et al, 2005). The XPS survey scan of CNTs is used to reveal the chemical compositions of the uppermost surface of the nanotubes.…”

Section: Synthesis Strategymentioning

confidence: 99%

Syntheses of Carbon Nanotube-Metal Oxides Composites; Adsorption and Photo-degradation

Gupta¹,

Saleh²

2011

Carbon Nanotubes - From Research to Applications

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“…3. First graphitic peak for diffraction from interlayer spacing (002), second for diffraction from in-plane regularity (100), third for gamma Fe (111) and alpha Fe (110) [35][36][37] can be clearly seen. The effect of oxidation and refluxing is visible as a reduced Fe-peak at the oxidized sample, the oxidized refluxed sample and the functionalized CNT bucky paper.…”

Section: Resultsmentioning

confidence: 99%

“…It shows some other band as well like D 0 at *1700 cm -1 and D ? G band beyond 2700 cm -1 [38,39,35]. The RBM mode gives the signature of SWCNTs, RBM frequency is inversely proportional to tube diameter which is not visible when tube diameter exceeds *2 nm.…”

Section: Resultsmentioning

confidence: 99%

Structural and mechanical properties of free-standing multiwalled carbon nanotube paper prepared by an aqueous mediated process

et al. 2017

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Free-standing carbon nanotube film (bucky paper) is a very important material for various applications, but its commercial production is still limited due to size, cost and properties. In the present work, different methods are used to prepare five different types of bucky papers, namely normal, pure refluxed, oxidized, oxidized refluxed and functionalized by using as-produced multiwalled carbon nanotubes (MWCNTs), refluxed MWCNTs, air-oxidized MWCNTs, oxidized refluxed MWCNTs and HNO 3 functionalized MWCNTs, respectively. Morphological, physical and structural changes appeared due to different methods are analysed by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction spectroscopy and Raman spectroscopy. Changes in the relative characteristic peak ratio (i.e. I G /I D , I G 0 /I D and I G 0 /I G ) as a function of MWCNTs quality are determined. It is observed that oxidized refluxed MWCNTs have an average value of I G /I D , I G 0/I D and I G 0 /I G ratio as 4.12, 7.15 and 1.71, respectively, which is higher as compared to other samples. The mechanical properties of different bucky papers are studied by performing tensile tests. The result showed that tensile strength, Young's modulus and toughness of oxidized refluxed MWCNTs bucky paper are 3.9 MPa, 440 MPa and 780 Jm -3 , respectively, which are higher as compared to as-produced MWCNTs bucky paper. The air oxidation and back-to-back refluxing generates nanoscale irregularities within the hexagonal C-structure of a nanotube wall. This helps in improving intermolecular bonding and packing which resulted into significant improvement in the mechanical properties. These bucky papers prepared by economical ways of air oxidation and refluxing in an alkali-soluble emulsifier assisted aqueous medium are potential candidates for field emission devices, energy storage devices and structural materials.

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Oxidative functionalization of carbon nanotubes in atmospheric pressure filamentary dielectric barrier discharge (APDBD)

Cited by 142 publications

References 11 publications

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

Syntheses of Carbon Nanotube-Metal Oxides Composites; Adsorption and Photo-degradation

Structural and mechanical properties of free-standing multiwalled carbon nanotube paper prepared by an aqueous mediated process

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