Purification of CVD synthesized single-wall carbon nanotubes by different acid oxidation treatments

Yu, Li; Zhang, Xiaobin; Luo, Junhang; Huang, Wei‐Pin; Cheng, J.P.; Luo, Zhiqiang; Li, Ting; Liu, Fu; Xu, Guoliang; Ke, Xiaoxing; Li, Lin; Geise, H. J.

doi:10.1088/0957-4484/15/11/047

Cited by 116 publications

(76 citation statements)

References 40 publications

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“…The intensity of the D-band did not significantly increase during the next 7 hours of oxidation. Detailed interpretation of Raman results of oxidized SWCNTs can be found elsewhere [8]. The XPS results revealed that the oxygen as well as the nitrogen content of f-SWCNTs increased almost linearly with oxidation time (Table 1).…”

Section: Resultsmentioning

confidence: 79%

“…Using these oxidizing agents also involves the introduction of oxidized carbon species at the SWCNTs sidewalls which can further be used as functional groups for the chemical modification of the nanotubes. Since oxidative purification methods became very common, many groups focussed on how the nanotubes are influenced by this treatment and tried to identify the changes to the nanotubes by using different methods [7][8][9]. X-ray photoelectron spectroscopy was used to shed some light on the chemical surrounding of the carbon atoms [10].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative determination of oxidative defects on single walled carbon nanotubes

Jung¹,

Graupner²,

Ley³

et al. 2006

Physica Status Solidi (b)

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A large variety of functional groups (i.e. carboxyl, carbonyl, aldehyde, alcohol) -representing the different oxidation states of carbon -can be produced by oxidative treatment of single walled carbon nanotubes (SWCNTs), depending on duration and temperature of the process. For subsequent functionalization steps it is essential to know the quantitative amount of the functional groups being converted in a chemical reaction. X-Ray Photoelectron Spectroscopy (XPS) proved to be a useful tool for such determination. Here, the asymmetry of the C1s core level in SWCNTs and the unknown peak positions of the functional groups prevented a detailed analysis of the produced oxidized carbon species. In this work we present an effective method to overcome this problem using XPS correlated with ab-initio calculations of the Mulliken charges in functionalized SWCNTs.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Quantitative determination of oxidative defects on single walled carbon nanotubes

Jung¹,

Graupner²,

Ley³

et al. 2006

Physica Status Solidi (b)

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“…The activated carbon, carbon black, and carbon nanomaterials because of their long life were considered as main catalyst support. CNMs are produced by different methods like flame spray pyrolysis, chemical vapor deposition method, electric arc, and laser (Li et al 2004;Gulino et al 2005). The CNMs have diameters 20-100 nm and surface area in the range between 100 and 350 m 2 g −1 made up of hexagonal lattice of carbon while activated carbon and carbon black have diameters of 5-30 μm and surface area between 100 and 1000 m 2 g −1 .…”

Section: Preparation Of Palladium-doped Carbon Materialsmentioning

confidence: 99%

Hydrogen storage studies on palladium-doped carbon materials (AC, CB, CNMs) @ metal–organic framework-5

Viditha

Srilatha

Himabindu

2015

Environ Sci Pollut Res

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Metal organic frameworks (MOFs) are a rapidly growing class of porous materials and are considered as best adsorbents for their high surface area and extraordinary porosity. The MOFs are synthesized by using various chemicals like triethylamine, terepthalic acid, zinc acetate dihydrate, chloroform, and dimethylformamide (DMF). Synthesized MOFs are intercalated with palladium/activated carbon, carbon black, and carbon nanomaterials by chemical reduction method for the purpose of enhancing the hydrogen adsorption capacities. We have observed that the palladium doped activated carbon on MOF-5 showed high hydrogen storage capacity. This may be due to the affinity of the palladium toward hydrogen molecule. The samples are characterized by X-ray diffraction, scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. We have observed a clear decrease in the BET surface area and pore volume. The obtained results show a better performance for the synthesized sample. To our best knowledge, no one has reported the work on palladium-doped carbon materials (activated carbon, carbon black, carbon nanomaterials) impregnated to the metal-organic framework-5. We have attempted to synthesize carbon nanomaterials using indigenously fabricated chemical vapor deposition (CVD) unit as a support. We have observed an increase in the hydrogen storage capacities.

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“…However, the application of carbon nanotubes for biomedical purposes has created a demand for high purity material, especially if the sidewalls of carbon nanotubes are to serve as platform for the non-covalent attachment of biomolecules. Li et al have compared different oxidation methods for CVD-synthesized SWCNTs and found that nitric acid pre-sonication, followed by refluxing in a mixture of concentrated acids yield the best results with respect to purity [18]. This two-step process was slightly adapted for the work presented here.…”

Section: Oxidation and Purification Of Swcntsmentioning

confidence: 99%

Triple functionalisation of single-walled carbon nanotubes with doxorubicin, a monoclonal antibody, and a fluorescent marker for targeted cancer therapy

Heister

Neves

Tîlmaciu

et al. 2009

Carbon

242

139

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Purification of CVD synthesized single-wall carbon nanotubes by different acid oxidation treatments

Cited by 116 publications

References 40 publications

Quantitative determination of oxidative defects on single walled carbon nanotubes

Quantitative determination of oxidative defects on single walled carbon nanotubes

Hydrogen storage studies on palladium-doped carbon materials (AC, CB, CNMs) @ metal–organic framework-5

Triple functionalisation of single-walled carbon nanotubes with doxorubicin, a monoclonal antibody, and a fluorescent marker for targeted cancer therapy

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