Synthesis of nearly monodisperse palladium (Pd) nanoparticles by using oleylamine and trioctylphosphine mixed ligands

Synthesis of Au(Core)/Ag(Shell) Nanoparticles and their Conversion to AuAg Alloy Nanoparticles

“…Other amine chain lengths for ripening and growth of the Ag shells were explored, but shorter chains caused irreversible precipitation during growth of the Ag shells, and longer chain lengths greatly slowed the rate of Ag shell growth; DDA provided solubility and reasonable growth rates. Amines are known to serve as reducing agents at elevated temperatures,56–59 and DDA reduces the Ag(I)–DDA complexes to Ag(0). We note that growth of Ag shells on Au cores requires a reducing agent for reducing Ag(I) to Ag(0).…”

Mechanism of Formation of Palladium Nanoparticles: Lewis Base Assisted, Low‐Temperature Preparation of Monodisperse Nanoparticles

“…The preparation of organic‐soluble Pd nanoparticles often involves the thermolysis of a Pd II precursor, such as [Pd(acac) 2 ] (acac=acetylacetonate)5a or sodium tetrachloropalladate,4b in the presence of an amine, such as oleylamine. High temperatures (200–300 °C) and air‐free conditions are necessary unless another reducing agent is introduced 4c.…”

“…High temperatures (200–300 °C) and air‐free conditions are necessary unless another reducing agent is introduced 4c. 9 In the presence of a coordinating additive, such as tri‐ n ‐octylphosphine4b, 5a or 1‐dodecanethiol,4a monodisperse nanoparticles can be obtained. We used 1 H NMR spectroscopy to elucidate the intermediates involved in the preparation of nanoparticles from [Pd(acac) 2 ] in the presence of excess 1‐hexadecylamine.…”

Directing Reaction Pathways through Controlled Reactant Binding at Pd–TiO2 Interfaces

“…Thei mprovements were attributed to ac ombined effect of controlling binding orientation of the aromatics and the presence of metalsupport interfacial sites,asillustrated in Figure 1b. Using am ethod modified based on Klabunde and coworkers, [29] we synthesized Pd 0 particles which were uniform in size ( % 4nm) and well-dispersed in solution, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction (XRD) ( Figure S1 in the Supporting Information). Prior to synthesis of TiO 2 films,alayer of surfactant molecules (cetyl trimethylammonium bromide (CTAB)) was deposited on the dispersed Pd NPs.T he microstructure of the TiO 2 films was controlled by adjusting the rate of hydrolysis of the titanium precursor via varying the rate of the water addition [30] or lowering the reactivity of the titanium precursor using acetone.…”