Decorated (Coated) Carbon Nanotubes: (X/CNTs)

Bacsa, Revathi; Serp, Philippe

doi:10.1002/9781119954743.ch4

Cited by 8 publications

(11 citation statements)

References 244 publications

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“…There are many methods of depositing nanoparticles onto MWCNTs, each offering various degrees of control of particle size and distribution along the MWCNTs (Wildgoose et al, 2006;Bacsa and Serp, 2012). They are generally classified in two groups: the wet methods including the electrochemical, sol-gel and impregnation methods, and the gas processes such as Physical Vapour Deposition (PVD), Atomic Layer Deposition (ALD) and Chemical Vapour Deposition (CVD) (Kuang et al, 2006;Bacsa and Serp, 2012;Goulas et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The gas processes yield products purer than the wet methods. They are single-step methods and generally involve high coating rates (Bacsa and Serp, 2012). CVD on MWCNTs has often been used to deposit metallic (Pt, Pd, Ru, Rh) or semiconducting (InP, CdSe) nanoparticles (Bacsa and Serp, 2012), but most often at the milligram scale, on nanotubes either deposited or supported on a planar substrate or put into a crucible as a fixed powder bed.…”

Section: Introductionmentioning

confidence: 99%

“…But as the density in defects is generally low, a surface activation in the form of functionalization or creation of defects at the carbon nanotube surface is essential to achieve a high coating density (Feng and Puddephatt, 2007;Bacsa and Serp, 2012). The most common method at the lab scale is the oxidative acid reflux that purifies and functionalizes the nanotubes in one step by grafting hydroxyl (C-OH), carbonyl (C = O) and carboxyl (O = C-OH) groups on the nanotube surface (Bacsa and Serp, 2012;Vennerberg et al, 2014). However, the liquid wastes generated by these wet oxidation methods are not suited to industrial use (Kim and Min, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…They are generally classified in two groups: the wet methods including the electrochemical, sol-gel and impregnation methods, and the gas processes such as Physical Vapour Deposition (PVD), Atomic Layer Deposition (ALD) and Chemical Vapour Deposition (CVD) (Kuang et al, 2006;Bacsa and Serp, 2012;Goulas et al, 2014). The wet im-pregnation method is the most widely used technique even if a multi-step method, because of its simplicity (Bacsa and Serp, 2012). However, the size of the coated particles is difficult to control precisely (Kuang et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Decoration of Carbon Nanotubes by Semiconducting or Metallic Nanoparticles using Fluidized Bed Chemical Vapour Deposition

Lassègue

Coppey

Noé

et al. 2016

KONA

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Multi-Walled Carbon Nanotubes (MWCNTs) have promising properties that make them potentially useful in a wide variety of applications. The decoration of MWCNTs by metallic or semiconducting nanoparticles aims to intensify some of their properties, in particular thermal and electrical conductivity. Fluidized Bed Chemical Vapour Deposition (FBCVD) is an efficient process to uniformly coat powders by various materials. The coating by SnO 2 , Fe and Si nanoparticles of MWCNTs (Graphistrength ® ) tangled in balls of 360 microns in mean diameter using the FBCVD process has been studied. The influence of some deposition parameters with and without oxidative pre-treatment is analysed on the nucleation and growth of nanoparticles. The various results obtained indicate that the intrinsic surface reactivity of MWCNTs is high enough for CVD precursors involving the formation of highly reactive unsaturated species such as silylene SiH 2 formed from silane SiH 4 pyrolysis in the case of Si deposition. But it must be enhanced for less reactive CVD precursors such as tin tetrachloride SnCl 4 which needs the presence of oxygen-containing groups at the nanotube surface to allow Sn nucleation. So, provided the reactivity of the powder surface and that of the CVD precursors are well tuned, the FBCVD process can uniformly coat the outer surface of MWCNTs by metallic or semiconducting nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Decoration of Carbon Nanotubes by Semiconducting or Metallic Nanoparticles using Fluidized Bed Chemical Vapour Deposition

Lassègue

Coppey

Noé

et al. 2016

KONA

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“…Gas-based processes like CVD generally yield products purer than wet methods. They are single step and generally involve high coating rates [13].…”

Section: ·Kmentioning

confidence: 99%

Fluidized bed chemical vapor deposition of copper nanoparticles on multi-walled carbon nanotubes

Lassègue

Noé

Monthioux

et al. 2017

Surface and Coatings Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. A B S T R A C TMulti-walled carbon nanotubes tangled in easy-to-fluidize porous balls have been decorated by pure copper nanoparticles using a pre-industrial fluidized bed chemical vapor deposition process. Copper (II) acetylacetonate Cu(acac) 2 was used as precursor. The low precursor volatility led to low deposition rates, responsible for a nonuniformity of the deposit both on the MWCNT balls and from the outer part to the center of the balls. An oxidative pre-treatment of the MWCNTs allowed to increase slightly the deposit weight and uniformity, by creating new nucleation sites on the nanotube surface. It also allowed decreasing the size of Cu nanoparticles by a factor of ten. A decrease of the deposition temperature increased more markedly the deposit weight, by probably favoring the formation of gaseous reactive intermediate species more reactive on the oxidized nanotube surface. A more efficient precursor delivery system would allow reaching higher deposition rates and much more uniform deposits, making possible an industrial production of metallized carbon nanotubes.

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Confinement of Metal Nanoparticles in Carbon Nanotubes

Nguyen

Serp

2013

ChemCatChem

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The effect of several parameters that include carbon nanotube (CNT) pretreatment and diameter, and the nature of the metal (Co, Ru, Pd), the metal precursor (nitrate, chloride, organometallic complexes), and the solvent on the filling yield of metallic nanoparticles in CNT channels is reported. The obtained results show that it is possible to modulate the filling yield between 10 and 80 % by controlling the CNT opening and playing on the molecular recognition of the inner/outer surfaces by the metal molecular precursor. Interestingly, the best filling yields have been obtained on nitric acid oxidized nanotubes; a treatment often used for the preparation of most CNT‐supported metal catalysts. The confined nanoparticles systematically show a smaller particle size than those supported on the external surface. All the prepared samples were tested for the selective hydrogenation of cinnamaldehyde, and clear correlations were established between the catalytic performances and the filling yields.

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Decorated (Coated) Carbon Nanotubes: (X/CNTs)

Cited by 8 publications

References 244 publications

Decoration of Carbon Nanotubes by Semiconducting or Metallic Nanoparticles using Fluidized Bed Chemical Vapour Deposition

Decoration of Carbon Nanotubes by Semiconducting or Metallic Nanoparticles using Fluidized Bed Chemical Vapour Deposition

Fluidized bed chemical vapor deposition of copper nanoparticles on multi-walled carbon nanotubes

Confinement of Metal Nanoparticles in Carbon Nanotubes

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