Carbon Nanotubes Decorated with Palladium Nanoparticles: Synthesis, Characterization, and Catalytic Activity

Karousis, Nikolaos; Tsotsou, Georgia-Eleni; Evangelista, Fabrizio; Rudolf, Petra; Ragoussis, Nikitas; Tagmatarchis, Nikos

doi:10.1021/jp802920k

Cited by 123 publications

(73 citation statements)

References 83 publications

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“…SDS is used as the surfactant and reducing agent in the synthesis of the Pd-graphene hybrids, since on heating it decomposes to 1-dodecanol which is subsequently oxidized to dodecanoic acid when it reduces the Pd(II) precursor to Pd [24]. As a result, the Pd-graphene hybrids have excellent dispersability, and no precipitation was observed after several months ( Fig.…”

Section: Synthesis Of Pd-graphene Hybridsmentioning

confidence: 99%

Palladium nanoparticle-graphene hybrids as active catalysts for the Suzuki reaction

et al. 2010

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Graphene has been successfully modified with palladium nanoparticles in a facile manner by reducing palladium acetate [Pd(OAc) 2 ] in the present of sodium dodecyl sulfate (SDS), which is used as both surfactant and the reducing agent. The palladium nanoparticle-graphene hybrids (Pd-graphene hybrids) are characterized by highresolution transmission electron microscopy, atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy. We demonstrate that the Pd-graphene hybrids can act as an efficient catalyst for the Suzuki reaction under aqueous and aerobic conditions, with the reaction reaching completion in as little as 5 min. The influence of the preparation conditions on the catalytic activities of the hybrids is also investigated.

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Section: Synthesis Of Pd-graphene Hybridsmentioning

confidence: 99%

Palladium nanoparticle-graphene hybrids as active catalysts for the Suzuki reaction

et al. 2010

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“…Due to their inherent and extraordinary physical, chemical, electronic [3,4], and mechanical properties [5], CNTs have raised much interest and provided exciting opportunities for producing advanced materials for new applications [6][7][8][9]. They have fast become one of the most researched topics and interest in different scientific fields such as batteries, hydrogen storage, gas sensors [10], optoelectronic devices [11], and catalysts [12].…”

Section: Introductionmentioning

confidence: 99%

Functionalization and Characterization of MWCNT Produced by Different Methods

et al. 2016

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The subject of this study is chemical functionalization as means of structural modification of multiwalled carbon nanotubes. The main goal of the experiments was to create highest density of carboxyl groups on multiwalled carbon nanotubes surface, necessary for further nanocomposite application. Two different types of multiwalled carbon nanotubes (I: outer diameter d = 50 ÷ 100 nm, purity ≈84%, synthesized by pyrolysis and II: outer diameter d = 10 ÷ 40 nm, purity ≈94%, synthesized by chemical vapor deposition) were treated by concentrated nitric acid (HNO3) and by alkaline mixture (NH4OH+H2O2). The alkaline medium as "milder" and less aggressive than nitric acid, was expected to be less destructive and cause minimal structural damage on multiwalled carbon nanotubes surface. Structural changes due to oxidation were observed by the Raman analysis, while the ratio of the intensities of the D and G peak was used to estimate the concentration of defects. Pristine and functionalized multiwalled carbon nanotubes were characterized by thermogravimetric analysis, scanning electron microscopy, ultraviolet-visible spectroscopy and zeta (ζ) spectroscopy. The results showed that functionalization initiates changes in carbon nanotubes structure as well as in their density of states. It also results in carbon nanotubes shortening and exfoliation and decreases their agglomeration tendency. Carbon nanotubes functionalized by both acid and alkaline treatment can successfully replace conventional carbon fibers as fillers in polymer composites for sensing application.

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“…They showed that the Pd/AC is more active than Pd/CNTs for the aerobic oxidation of cinnamyl alcohol in ethanol. Moreover Karousis et al [14] reported higher activity of CNTs supported metal nanoparticles with respect to AC supported ones in the hydrogenation of methyl-9-octadecenoate and 2-methyl-2-pentenal. They concluded that the high catalytic performance of CNTs supported Pd is due to the large active surface of metallic palladium.…”

Section: Introductionmentioning

confidence: 99%

Pd on carbon nanotubes for liquid phase alcohol oxidation

et al. 2010

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Pd nanoparticles supported on carbon nanotubes (CNTs) showed a higher selectivity than Pd nanoparticles supported on activated carbon (AC) in the liquid phase oxidation of benzylic alcohol to benzaldehyde. Under solventless conditions a significant improvement in selectivity was observed for Pd/CNTs, whereas using Pd/AC a considerable over-oxidation of benzaldehyde was observed. Differently from other solvents cyclohexane improved significantly the selectivity to benzaldehyde for both catalysts. Characterisation by means of transmission electron microscopy revealed differences in metal dispersion between Pd/AC and Pd/CNTs that can be ascribed to textural, chemical and physical differences between Active Carbon and Carbon Nanotubes. The higher activity in the case of Pd on AC than on CNTs can be attributed to the improved Pd dispersion in the first case. On recycling Pd/CNTs resulted more stable (activity loss 50% in 7 runs) than Pd/AC (activity loss 70% in 7 runs) even a structural change of catalysts after reaction is observed. The Pd leaching and particle coalescence are the main reasons for the loss of activity. An extraordinary improving of catalyst life has been observed by alloying the Pd nanoparticles with Au, When CNTs are used as support the strong Pd leaching can be greatly limited and the activity/selectivity maintained at least for 8 runs.

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Carbon Nanotubes Decorated with Palladium Nanoparticles: Synthesis, Characterization, and Catalytic Activity

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Cited by 123 publications

References 83 publications

Palladium nanoparticle-graphene hybrids as active catalysts for the Suzuki reaction

Palladium nanoparticle-graphene hybrids as active catalysts for the Suzuki reaction

Functionalization and Characterization of MWCNT Produced by Different Methods

Pd on carbon nanotubes for liquid phase alcohol oxidation

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