Effects of Ligand and Solvent on the Synthesis of Iron Oxide Nanoparticles from Fe(acac)₃ Solution by Femtosecond Laser Irradiation

Synthesis of Air-Stable Cu Nanoparticles Using Laser Reduction in Liquid

“…Despite the large numbers of small NPs, they make up a tiny fraction of the overall mass of Cu NPs, as evident in the mass-weighted size distributions. Nevertheless, the contribution of NPs smaller than 10 nm to the overall mass slightly increased from 0.16 % at 0 h to 0.34 % at 3 h and 24 h. The slight size increase in the small NPs after the initial synthesis was also observed for Fe oxide NPs synthesized by LRL from Fe(acac) 3 in hexane [ 47 ], although, in that work, no large NPs were observed. A carbon shell around clusters of Cu NPs is also visible in Figure 1 , particularly for the 3 h and 24 h samples.…”

“…The formation of a substantial carbon shell around the LRL Cu NPs after termination of laser irradiation strongly suggests that the carbon formation is not entirely attributable to direct laser-induced solvent decomposition, as with PLAL in organic solvents [16,17,27,28]. Moreover, the lack of carbon shell formation during LRL of Fe(acac) 3 in water [47] indicates that the acetylacetonate ligands from the precursor are not sufficient to induce carbon shell formation in LRL. On the basis of these results, we can speculate that the carbon shell is formed from catalytic activation on the Cu NP metal surfaces of long-lived solvent and ligand byproducts produced during laser irradiation.…”

“…Although Au is resistant to back-oxidation and HAuCl 4 precursor can be reduced by H 2 O 2 [37], effective production of Ag-containing NPs by LRL requires the addition of OH • scavengers, such as ammonia or isopropyl alcohol, to prevent backoxidation of Ag [40,41,45]. Moreover, the few LRL studies on the non-noble metal Fe report production of only Fe oxides [46,47].…”

Synthesis of iron-based nanoparticles from ferrocene by femtosecond laser irradiation: Suppression of the particle growth in a mixture of water and hexane

“…S2 in the Supporting Information); however, the oxidation states of them were not identified. By analogy to the results obtained in n-hexane [35,37], the resultant nanoparticles would be consisted of oxidized irons. SAED analysis revealed that the resultant Fe-based NPs were amorphous states because only characteristic halo ring patterns were appeared.…”

“…It is known that Fe-based NPs smaller than about 20 nm in diameter are expected to have superparamagnetic properties applicable to magnetic and biomedical materials [36]. We recently reported that the use of acetylacetonate complex in water resulted in the production of Fe-based NPs smaller than 10 nm without accompanying carbon agglomerates [37].…”