Elaboration and characterization of bimetallic nanoparticles obtained by laser ablation of Ni75Pd25 and Au75Ag25 targets in water

Mahfouz, R. M.; Aires, F.J. Cadete Santos; Brenier, A.; Ehret, E.; Roumié, M.; Nsouli, B.; Jacquier, B.; Bertolini, J.C.

doi:10.1007/s11051-010-9949-7

Cited by 31 publications

(11 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hamad et al achieved Ag‐TiO 2 composites after LAL of a Ti/Ag alloy target in water . Mahfouz et al reported the nonstoichiometric composition of LAL‐synthesized NiPd alloy nanoparticles due to the formation of NiOH species in water . As expected, oxidative species (e.g., O•, H•, •OH) from water hydrolysis often lead to oxidative‐LAL and result in the formation of oxides, unfavorable for synthesizing alloy particles.…”

Section: Introductionmentioning

confidence: 91%

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Zhang

Spasova

et al. 2017

Part. Part. Syst. Charact.

View full text Add to dashboard Cite

Laser ablation in liquids (LAL) has emerged as a versatile approach for the synthesis of alloy particles and oxide nanomaterials. However, complex chemical reactions often take place during synthesis due to inevitable atomization and ionization of the target materials and decomposition/hydrolysis of solvent/solution molecules, making it difficult to understand the particle formation mechanisms. In this paper, a possible route for the formation of FeMn alloy nanoparticles as well as MnOx nanoparticles, ‐sheets, and ‐fibers by LAL is presented. The observed structural, compositional, and morphological variations are clarified by transmission electron microscopy (TEM). The studies suggest that a reaction between Mn atoms and Fe ions followed by surface oxidation result in nonstoichiometric synthesis of Fe‐rich FeMn@FeMn2O4 core–shell alloy particles. Interestingly, a phase transformation from Mn3O4 to Mn2O3 and finally to Ramsdellite γ‐MnO2 is accompanied by a morphology change from nanosheets to nanofibers in gradually increasing oxidizing environments. High‐resolution TEM images reveal that the particle‐attachment mechanism dominates the growth of different manganese oxides.

show abstract

Section: Introductionmentioning

confidence: 91%

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Zhang

Spasova

et al. 2017

Part. Part. Syst. Charact.

View full text Add to dashboard Cite

show abstract

“…2D-FFT clearly shows features related to diffraction Debye-Scherrer rings assigned to (111) and (002) type planes, which are typical for a facecentered cubic (fcc) crystal lattice and confirms that this particle is metallic (cubic oxide phases of Pd and Ag do not have lattice parameters consistent with the measured ones). [38][39][40][41] The EDX analysis also revealed that the samples treated with O 2 plasma induce a higher inhomogeneity of the Pd/Ag ratio. For the bigger particle at the bottom of Fig.…”

Section: Resultsmentioning

confidence: 93%

Bimetallic PdAg nanoparticle arrays from monolayer films of diblock copolymer micelles

et al. 2015

Self Cite

View full text Add to dashboard Cite

The self-assembly technique provides a highly efficient route to generate well-ordered structures on a nanometer scale. In this paper, well-ordered arrays of PdAg alloy nanoparticles on flat substrates with narrow distributions of particle size (6-7 nm) and interparticle spacing (about 60 nm) were synthesized by the block copolymer micelle approach. A home-made PS-b-P4VP diblock copolymer was prepared to obtain a micellar structure in toluene. Pd and Ag salts were then successfully loaded in the micellar core of the PS-b-P4VP copolymer. A self-assembled monolayer of the loaded micelles was obtained by dipping the flat substrate in the solution. At this stage, the core of the micelles was still loaded with the metal precursor rather than with a metal. Physical and chemical reducing methods were used to reduce the metal salts embedded in the P4VP core into PdAg nanoparticles. HRTEM and EDX indicated that Pd-rich PdAg alloy nanoparticles were synthesized by chemical or physical reduction; UV-visible spectroscopy observations confirmed that metallic PdAg nanoparticles were quickly formed after chemical reduction; XPS measurements revealed that the PdAg alloy nanoparticles were in a metallic state after a short time of exposure to O2 plasma and after hydrazine reduction.

show abstract

“…The catalyst morphology and tungsten-distribution over the silica support were investigated by transmission electron microscopy (TEM) with JEOL JEM 2010 TEM equipped with a LaB 6 gun and a Pentafet LinK EDX spectrometer and INCA software capable of high-resolution imaging (UHR pole-piece; 0.196 nm point resolution) and local (individual nanoparticle) analysis [14][15][16][17][18].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Effect of Dispersion of the Active Phase on the Activity and Coke Formation over WO3/SiO2 Catalysts in the Metathesis of Ethylene and 2-Butene

et al. 2015

View full text Add to dashboard Cite

WO 3 /SiO 2 catalysts with various tungsten loadings were prepared by the incipient wetness impregnation method and studied in the metathesis of ethylene and trans-2-butene as feed to produce propylene. Two different calcination methods were used to modify the dispersion of the tungsten active phase. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, nitrogen physisorption, ion-exchange titration, FT-Raman, ammonia temperature programmed desorption and temperature programmed oxidation. Better dispersion is obtained from low heating rate calcination. The dispersion of tungsten showed a direct effect on coke formation and was the key factor to improve the stability of the catalysts. Graphical Abstract

show abstract

Elaboration and characterization of bimetallic nanoparticles obtained by laser ablation of Ni75Pd25 and Au75Ag25 targets in water

Cited by 31 publications

References 55 publications

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Bimetallic PdAg nanoparticle arrays from monolayer films of diblock copolymer micelles

Effect of Dispersion of the Active Phase on the Activity and Coke Formation over WO3/SiO2 Catalysts in the Metathesis of Ethylene and 2-Butene

Contact Info

Product

Resources

About