Laser synthesis, structure and chemical properties of colloidal nickel-molybdenum nanoparticles for the substitution of noble metals in heterogeneous catalysis

Marzun, Galina; Levish, Alexander; Mackert, Viktor; Kallio, Tanja; Barcikowski, Stephan; Wagener, Philipp

doi:10.1016/j.jcis.2016.09.014

Cited by 61 publications

(81 citation statements)

References 88 publications

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“…Influentialf actors that affect the particle properties are primarily laser characteristics (fluence, pulse duration,wavelength), the target material, and the ablation environment. [23][24][25][26] Thus, knowledge of the influence of the surrounding media is crucial.B ecause copper reveals interesting properties The variety of the materials and laser properties opensu pn ew dimensions for synthesis routes to nanomaterials, which enables new findings in, for example, catalysis research.…”

Section: Introductionmentioning

confidence: 99%

“…[31] Particle size reductioni sp ossible by using subsequentl aser fragmentation. [25,26] Amans et al investigated the laser synthesis of U-Al 2 O 3 in water and characterized the nucleation of the particles by using plasma-emission spectroscopy. Overall, the investigationss how that the solvent plays ac rucial role in the final chemicalc omposition and particles tructure.…”

Section: Introductionmentioning

confidence: 99%

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Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

et al. 2017

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The role of molecular oxygen dissolved in the solvent is often discussed as being an influential factor on particle oxidation during pulsed laser ablation in liquids. However, the formation of the particles during laser synthesis takes place under extreme conditions that enable the decomposition of the liquid medium. Reactive species of the solvent may then affect particle formation due to a chemical reaction in the reactive plasma. Experimental results show a difference between the role of dissolved molecular oxygen and the contribution from the oxygen in water molecules. Using a metallic Cu target in air-saturated water, laser ablation led to 20.5 wt % Cu, 11.5 wt % Cu O, and 68 wt % CuO nanoparticles, according to X-ray diffraction results. In contrast to particles obtained in air-saturated water, no CuO was observed in the colloid synthesized in a Schlenk ablation chamber in completely oxygen-free water. Under these conditions, less-oxidized nanoparticles (25 wt % Cu and 75 wt % Cu O) were synthesized. The results show that nanoparticle oxidation during laser synthesis is mainly caused by reactive oxygen species from the decomposition of water molecules. However, the addition of molecular oxygen promotes particle oxidation. Storage of the Cu colloid in the presence of dissolved oxygen leads, due to aging, to nanostructures with a higher oxidation state than the freshly prepared colloid. The XRD pattern of the sample prepared in air-saturated acetone showed no crystalline phases, which is possibly due to small crystallites or low particle concentration. Concentration of the particles by centrifugation showed that in the large fraction (>20 nm), even less oxidized nanoparticles (46 wt % Cu and 54 wt % Cu O) were present, although the solubility of molecular oxygen is higher in acetone than in water. The nanoparticles in acetone were stable due to a Cu-catalyzed graphite layer formed on their surfaces. The influence of the solvent on alloy synthesis is also crucial. Laser ablation of PtCu in air-saturated water led to separated large CuO and Pt-rich spherical nanoparticles, whereas homogeneous PtCu alloy nanoparticles were formed in acetone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

et al. 2017

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“…[9] For instance, nanoalloys can be synthesized by pulsed laser ablationi nl iquids (PLAL) through ablation of ab ulk target to obtain FeNi, [10] FeAu, [8,11] FeMn, [12] AgGe, [13] PtCo. [14] But also ablation of apressed target consisting of powders of the constituent metals will lead to alloys such as PtAu, [15] NiMo [16] and AgAu. [15,17] The latter route not just leads to cheaper targets but also to time saving since series testing can be conducted by finely tuning the target and ultimately the nanoparticle composition.…”

Section: Introductionmentioning

confidence: 99%

Ultrasmall Yttrium Iron Garnet Nanoparticles with High Coercivity at Low Temperature Synthesized by Laser Ablation and Fragmentation of Pressed Powders

et al. 2017

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Pulsed laser ablation of pressed yttrium iron garnet powders in water is studied and compared to the ablation of a single-crystal target. We find that target porosity is a crucial factor, which has far-reaching implications on nanoparticle productivity. Although nanoparticle size distributions obtained by analytical disc centrifugation and transmission electron microscopy (TEM) are in agreement, X-ray diffraction and energy dispersive X-ray analysis show that only nanoparticles obtained from targets with densities close to that of a bulk target lead to comparable properties. Our findings also show why the gravimetrical measurement of nanoparticle productivity is often flawed and needs to be complemented by colloidal productivity measurements. The synthesized YIG nanoparticles are further reduced in size by laser fragmentation to obtain sizes smaller than 3 nm. Since the particle diameters are close to the YIG lattice constant, these ultrasmall nanoparticles reveal an immense change of the magnetic properties, exhibiting huge coercivity (0.11 T) and irreversibility fields (8 T) at low temperatures.

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“…Analogously to the trend observed for alkyne hydrogenations, NiNPs stabilized by TPPTS were much less efficient than those containing cinchona ligands as stabilizers, NiA and NiB (see Table 3), probably due to the stronger interaction of the phosphine to the Ni surface, hampering the coordination of the substrate to the metal. This behavior can be attributed to two related effects: stabilizer A is probably more labile than B due to the presence of the methoxide group on the quinoline ring, hence favoring the coordination of substrate to be hydrogenated, effect that may have a greater impact on sterically hindered substrates, such as 1,3-dinitrobenzene (14). Curiously, 1,3-dinitrobenzene (14) was hydrogenated by NiA obtaining 1,3-diaminobenzene (14 a) in 77% yield (entry 3, Table 3), however, NiB was substantially less active (only 30% yield under the same conditions).…”

Section: Resultsmentioning

confidence: 99%

“…[6] However, over reduction and isomerization reactions happen and consequently the chemoselectivity is difficult to be controlled. Some of these methodologies describe the synthesis of Ni-based alloys [9,11,13,14] and also nickel nanoparticles supported on different kinds of solids, [8,12,[15][16][17][18] even under continuous millifluidic conditions. [7][8][9][10][11][12][13] In the last decade, the skillful synthesis of welldefined NiNPs has attracted the attention of several research groups, being the main challenge the exclusive formation of Ni(0) nano-materials due to the easy oxidation of zero-valent nickel species.…”

Section: Introductionmentioning

confidence: 99%

Stable Zero‐Valent Nickel Nanoparticles in Glycerol: Synthesis and Applications in Selective Hydrogenations

et al. 2018

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Small (mean diameter, ca. 1.2 nm) and well-dispersed zero-valent nickel nanoparticles (NiNPs) stabilized by cinchona-based alkaloids and TPPTS (tris(3-sulfophenyl)phosphine trisodium salt), were synthesized from the organometallic precursor [Ni(cod) 2 ] in neat glycerol under hydrogen pressure. NiNPs were fully characterized ((HR)-TEM, EDX, XPS, XRD, IR, magnetization), both at solid state and directly from the corresponding colloidal solutions in glycerol due to its negligible vapour pressure. NiNPs dispersed in glycerol were applied in hydrogenation reactions, in particular in semihydrogenation of alkynes to give (Z)-alkenes under satisfactory conditions (3 bar H 2 , 1 mol% Ni, 100 8C), showing remarkable activity and selectivity. The catalytic phase was recycled at least ten times without loss of activity, affording in each case metal-free organic products. Other functional groups such as nitro, nitrile and formyl groups were efficiently hydrogenated to the corresponding anilines, benzylamines and benzylalcohols respectively (77-95% yields).

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Laser synthesis, structure and chemical properties of colloidal nickel-molybdenum nanoparticles for the substitution of noble metals in heterogeneous catalysis

Cited by 61 publications

References 88 publications

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Ultrasmall Yttrium Iron Garnet Nanoparticles with High Coercivity at Low Temperature Synthesized by Laser Ablation and Fragmentation of Pressed Powders

Stable Zero‐Valent Nickel Nanoparticles in Glycerol: Synthesis and Applications in Selective Hydrogenations

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