New size effect in the catalysis by interacting copper nanoparticles

Rostovshchikova, T. N.; Смирнов, В. В.; Kozhevin, V. M.; Yavsin, D. A.; Zabelin, M. A.; Yassievich, I. N.; Gurevich, S. A.

doi:10.1016/j.apcata.2005.08.032

Cited by 73 publications

(26 citation statements)

References 19 publications

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“…The peaks indicated by full diamonds correspond to resonant transitions of 108 cm À1 (C 12 ), 165 cm À1 (C 12 (1) ), and 232 cm À1 (2 C 12 (À) ) of Cu 2 O. 37,38 The peak appearing at 50 cm À1 is a tail of the strong Rayleigh line, while the feature starting at about 550 cm À1 is the onset of the water Raman band, extending up to about 3000 cm À1 .…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] Copper properties such as high conductivity, photosensitivity, and low cost makes it a promising material for chemical, electronic, and photonic integration in miniaturized devices for use in biological nanosensors, [6][7][8][9][10] as well as its capability of insertion in host polymer matrices for nonlinear optical applications. [11][12][13] Optical properties such as extinction and plasmon resonance are highly size dependent below 10 nm. They also depend on host environment and particularly on the possible shell grown around the particle during the fabrication process that yields, in general, core-shell structure Nps.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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We report on the analysis of structure, configuration, and sizing of Cu and Cu oxide nanoparticles (Nps) produced by femtosecond (fs) laser ablation of solid copper target in liquids. Laser pulse energy ranged between 500 lJ and 50 lJ. Water and acetone were used to produce the colloidal suspensions. The study was performed through optical extinction spectroscopy using Mie theory to fit the full experimental spectra, considering free and bound electrons size dependent contributions to the metal dielectric function. Raman spectroscopy and AFM technique were also used to characterize the sample. Considering the possible oxidation of copper during the fabrication process, two species (Cu and Cu 2 O) arranged in two structures (bare core or core-shell) and in two configuration types (Cu-Cu 2 O or Cu 2 O-Cu) were considered for the fitting depending on the laser pulse energy and the surrounding media. For water at high energy, it can be observed that a CuCu 2 O configuration fits the experimental spectra of the colloidal suspension, while for decreasing energy and below a certain threshold, a Cu 2 O-Cu configuration needs to be included for the optimum fit. Both species coexist for energies below 170 lJ for water. On the other hand, for acetone at high energy, optimum fit of the full spectrum suggests the presence a bimodal Cu-Cu 2 O core-shell Nps distribution while for decreasing energy and below a 70 lJ threshold energy value, Cu 2 O-Cu core-shell Nps must be included, together with the former configuration, for the fit of the full spectrum. We discuss possible reasons for the changes in the structural configuration of the core-shell Nps. V C 2013 American Institute of Physics. [http://dx

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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“…Research on nanoparticles has gathered wide attention during the last decade because of their unusual and size-dependent optical [1], magnetic [2] and [3], electronic [4] and [5], and chemical [6] and [7] properties. To fully utilize these properties, the size and shape must be well controlled.…”

Section: Introductionmentioning

confidence: 99%

Influence of ligand structure on the stability and oxidation of copper nanoparticles

Kanninen¹,

Johans²,

Merta

et al. 2008

Journal of Colloid and Interface Science

247

173

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The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust-Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed.Oxidation and stability were studied by UV-vis, XRD, and TEM. Alkanethiols and oleic acid were found to improve air stability. The oxidation resistance of thiol-capped copper nanoparticles was found to increase with the chain length of the thiol. However, excess thiol caused etching of the particles under nitrogen. With oleic acid no etching was observed under nitrogen. After oxidation, no traces of the ligand-exchanged particles were found, suggesting their dissolution due to excess ligand. Oleic acid protected the particles against oxidation better than the tested thiols at large excess (ligand-copper ratio 20:1).

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“…The recent progress in heterogeneous catalysis by gold resulted in remarkable investigations that demonstrated the high activity of 3-10-nm gold particles in the conversion of bioethanol to synthetic hydrocarbons [2], water gas shift reaction [3,4], selective hydrogenation of alkynes [5][6][7][8], hydrodechlorination of organic molecules [9,10], and CO oxidation [11][12][13]. Numerous data on gold catalysis indicate that, apart from the critical particle size (3-5 nm) [1,14], significant roles for catalytic activity are played by particle shape [13,15], particle surface chemistry [16,17], the support nature [10,18], mutual arrangement of particles, the sign and quantity of the electric charge on the nanoparticle surface [19,20]. However, the activity of gold nanoparticles is mainly attributed to the high surface curvature [1,13].…”

Section: Introductionmentioning

confidence: 99%

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

et al. 2015

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The copper-doped gold nanowires (4 nm in diameter) were produced by the novel technique based of laser ablation of Au-Cu alloy inside superfluid helium. The principle of the method is using the quantized vortices as the 1D template for the condensation of the ablation products into thin threads. The nanowires were applied as the catalyst in СО oxidation with oxygen. The activity of Au-Cu nanowires deposited on glass filters was compared with that for monometallic and bimetallic Au and Cu particles (3-8 nm in diameter) deposited on alumina by traditional deposition-precipitation and impregnation techniques. The apparent activation energies of the reaction (Еа) were 95 and 98, 150, and 147 kJ/ mol for Au-Cu nanowires and Au-Cu, Au, and Cu particles, respectively. During running-in of the Au-Cu nanowirebased catalyst, Еа decreased to 20 kJ/mol and retained at this level in the subsequent cycles of lowering and raising the reactor temperature.

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New size effect in the catalysis by interacting copper nanoparticles

Cited by 73 publications

References 19 publications

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Influence of ligand structure on the stability and oxidation of copper nanoparticles

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

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