In-situ synthesis of palladium nanoparticles-filled carbon nanotubes using arc-discharge in solution

Bera, Debasis; Kuiry, S. C.; McCutchen, Matthew; Kruize, Arnold; Heinrich, Helge; Meyyappan, M.; Seal, Sudipta

doi:10.1016/j.cplett.2004.01.082

Cited by 82 publications

(41 citation statements)

References 30 publications

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“…P 1 ͑338.02 eV͒ and P 2 ͑343.35 eV͒ peaks correspond to 3d 5/2 and 3d 3/2 for PdO, respectively, 15,16 which shows Pd is oxidized as soon as exposed to air. Since the PdO peaks in the XPS study on Pd doped carbon nanotubes and SnO 2 nanowires have not been observed, 17,18 the occurrence of PdO in the Pd-VONs can be a key to understanding the current suppression of the Pd-VON. As the Pd-VONs were exposed to hydrogen gas, P 1 and P 2 peaks decrease the binding energy by 0.2 eV ͓Fig.…”

Section: Electrical Current Suppression In Pd-doped Vanadium Pentoxidmentioning

confidence: 99%

Electrical current suppression in Pd-doped vanadium pentoxide nanowires caused by reduction in PdO due to hydrogen exposure

Kim

Jeong

et al. 2010

Applied Physics Letters

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Pd nanoparticle-doped vanadium pentoxide nanowires (Pd-VONs) were synthesized. Electrical current suppression was observed when the Pd-VON was exposed to hydrogen gas, which cannot be explained by the work function changes mentioned in previous report such as Pd-doped carbon nanotubes and SnO2 nanowires. Using the x-ray photoelectron spectroscopy, we found that the reduction in PdO due to hydrogen exposure plays an important role in the current suppression of the Pd-VON.

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Section: Electrical Current Suppression In Pd-doped Vanadium Pentoxidmentioning

confidence: 99%

Electrical current suppression in Pd-doped vanadium pentoxide nanowires caused by reduction in PdO due to hydrogen exposure

Kim

Jeong

et al. 2010

Applied Physics Letters

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“…Metallic nanoparticles have a characteristic high surface-to-volume ratio and, consequently, a large fraction of the metal atoms at the surface, and hence are available for catalysis [4][5][6][7]. Therefore, stabilised and monodispersed palladium nanoparticles have been synthesised using sonochemical reduction processes [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism of Pd/PVP nanoparticles: effect of ultrasonic irradiation time

Nemamcha

2018

GJPAAS

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The effects of ultrasonic irradiation time on the palladium nanoparticles (Pdns) formation mechanism have been investigated using UV-Visible spectroscopy, Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Pdns colloids have been prepared by ultrasonic irradiation of Pd(NO3)2 solutions at different irradiation times (from 30 to 180 minutes). The obtained results show that the rate of sonochemical reduction of Pd(II) ions has been found to be dependent upon the irradiation time. The kinetic of Pdns formation can also be correlated with the rate of sonochemical reduction of Pd(II) ions, as well as with the role of PVP molecules. The results suggest a three-step mechanism to describe the Pdns formation as a function of ultrasound irradiation time. During the first step, the Pd(II) ions are rapidly reduced to Pd(0) atoms, and when the concentration of Pd(0) atoms is sufficient for nucleation, the formation of primary particles occurs which are stabilised by a maximal number of PVP molecules. During the second step, these particles grow progressively by adsorption of the Pd(0) atoms and the obtained particles are coordinated to all available PVP molecules. The third step corresponds to decrease of the bounded PVP to the particle surface and the growth of the large particles at the expense of the unstable small ones.

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“…8) The amazing properties of CNTs 9) and thus their promising applications 10)12) strongly depend on their structural characteristics, such as the number of layers, inner and outer tube diameter and presence of defects in them. CNTs are produced by arc-discharge, 13) laser ablation, 14) and plasma enhanced 15) and thermal chemical vapour deposition (CVD), 14)16) sometimes also called Catalytic Chemical Vapour Decomposition (CCVD). CVD has proven to be the most effective technique, due to its low cost, easy operation, versatility, industrial scalability and effectiveness in producing CNTs with both high quality and large quantity.…”

Section: Introductionmentioning

confidence: 99%

In situ CCVD synthesis of carbon nanotubes within zeolite crystal coated porous ceramic foam

Mazumder

Zhao

Park

et al. 2015

J. Ceram. Soc. Japan

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In this study, consolidated zeolite crystal coated porous ceramic foams containing a large quantity of carbon nanotubes (CNTs) within micro-metre sized pores were prepared. An alumina-silica porous ceramic body, having an average pore size of less than 100¯m, was produced by the direct foaming technique. Well-shaped zeolite crystals having an average size of 180 nm were synthesized and homogeneously coated on the porous ceramic body by an in situ process. An Fe-supported zeolite/ceramic matrix, which is used for CNT synthesis, was prepared using ion-exchange by immersing the zeolite-coated porous ceramic body into FeCl 2 aqueous solution. The CNTs were synthesized by a catalytic chemical vapour deposition (CCVD) process for four different reaction times. Both acicular-shaped and randomly bundled networks of multi-walled carbon nanotubes (MWCNTs) were synthesized using these different reaction times. Moreover, the yield of CNTs produced showed a tendency to increase with increasing reaction time.

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In-situ synthesis of palladium nanoparticles-filled carbon nanotubes using arc-discharge in solution

Cited by 82 publications

References 30 publications

Electrical current suppression in Pd-doped vanadium pentoxide nanowires caused by reduction in PdO due to hydrogen exposure

Electrical current suppression in Pd-doped vanadium pentoxide nanowires caused by reduction in PdO due to hydrogen exposure

Formation mechanism of Pd/PVP nanoparticles: effect of ultrasonic irradiation time

In situ CCVD synthesis of carbon nanotubes within zeolite crystal coated porous ceramic foam

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