Combined growth of carbon nanotubes and carbon nanowalls by plasma-enhanced chemical vapor deposition

Malesevic, Alexander; Vizireanu, Sorin; Kemps, Raymond; Vanhulsel, Annick; Haesendonck, C. Van; Dinescu, G.

doi:10.1016/j.carbon.2007.10.004

Cited by 51 publications

(31 citation statements)

References 29 publications

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“…It appears that the size of these nano-agglomerates has been further enhanced for this structure as compared to the previous structures. It is expected that, the metallic Cu layer present in the multilayer structure may play an important role in changing the structure of a-C:H from amorphous to nano-agglomerates, because nanotube and nanofiber like structure in thin film form have been studied previously, which had been obtained by growing a very thin metallic base layer prior to the amorphous carbon layer [20]. This kind of structure has also obtained by Ikuno et al [28] and Bonard et al [29].…”

Section: Residual Stressmentioning

confidence: 74%

“…The use of a multilayer structure improves the adhesion of coatings to the substrates due to the inter layer present in the structures, which in turn minimizes the differences between the substrate and the coatings. By close examine, it is realized that metal/a-C:H multilayer has an additional advantage over other a-C:H structures that, in certain cases, metallic base layer, a few nanometers thick, in the multilayer structure of metal/a-C:H may also act as a catalyst for the formation of carbon nanostructures [19,20]. Multilayer structure of metal/a-C:H also find applications in the area of electronics and optics.…”

Section: Introductionmentioning

confidence: 99%

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Studies of nanostructured copper/hydrogenated amorphous carbon multilayer films

Dwivedi¹,

Kumar²,

Ishpal³

et al. 2011

Journal of Alloys and Compounds

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Section: Residual Stressmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Studies of nanostructured copper/hydrogenated amorphous carbon multilayer films

Dwivedi¹,

Kumar²,

Ishpal³

et al. 2011

Journal of Alloys and Compounds

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“…After removal of MLG from MWCNTs, the surface of MWCNTs was bared and examined by Raman Spectroscopy. The I D /I G ratio of bared MWCNTs is high and may be due to the presence of few open tips and sidewalls (more defects) [30]. Further, as a result of nitrogen exposure, more defects are induced in the MLG-MWCNTs hybrid structure.…”

Section: Micro-raman Spectroscopy Studies Of Hybrid Structurementioning

confidence: 98%

Microwave plasma CVD-grown graphene–CNT hybrids for enhanced electron field emission applications

Kaushik

Shukla

2014

Appl. Phys. A

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The growth and electron emission characteristics were investigated from a hybrid structure of multiwalled carbon nanotubes (MWCNTs) and multilayer layer graphene (MLG) deposited on silicon substrate coated with iron catalyst and an interlayer of aluminium. The hybrid structures were synthesized in a two-step process by microwave plasma-enhanced chemical vapour deposition technique. The formation of MWCNTs takes place by absorption and precipitation of carbon radicals into the catalyst particles. Thereafter, ample carbon forms MLG on tip of the MWCNTs resulting in a MLG-MWCNTs hybrid nanostructure. MLG was observed to grow branching out of the tips and sidewalls of the MWCNTs and is expected to attach by Van der Walls bonds. Transmission electron microscopy and micro-Raman spectroscopy confirmed the crystalline nature of the hybrid structures. Electron emission studies were carried out using a diode-type field emission setup. The enhancement factor was found to be *3,500 for bare MWCNTs, *4,070 to *5,000 for hybrid structures and *6,500 for N-doped MLG-MWCNTs hybrid structures. Modification in the defects structure and enhancement of emission sites are suggested to be responsible for the increase of the field emission characteristics.

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“…And hence, during the Ar ion bombardment, CNTs are subjected to structural changes due to displacement collision effect, which generates large quantities of defects (vacancies and interstitials) on the tube walls, with the dominant type of defects being single vacancy [47,48]. Such defects may provide nucleation sites for CNSs [7,8], and lead to more and more branch-like CNSs formation.…”

Section: Synthesis Of a Composite Of Consisting Of Cnts And "Petal-limentioning

confidence: 98%

“…Wu et al [6] have reported the fabrication of CNSs standing vertically on a catalyzed substrate using microwave PECVD. Recently, Malesevic et al [7] have reported the combined growth of CNTs and CNSs employing PECVD. Zeng et al [8] have prepared CNSs on CNTs substrate treated by hydrogen plasma using microwave PECVD.…”

Section: Introductionmentioning

confidence: 99%