Sonochemical Preparation of Bimetallic Nanoparticles of Gold/Palladium in Aqueous Solution

Abstract

Colloidal dispersions of bimetallic nanoparticles composed of gold and palladium were prepared by a sonochemical method, in which Au(III) and Pd(II) ions in an aqueous solution of sodium tetrachloroaurate(III)dihydrate and sodium tetrachloropalladate(II) were reduced by ultrasound irradiation in the presence of sodium dodecyl sulfate (SDS). In addition to the stabilizing effect, SDS remarkably enhanced the reduction rate, probably due to the thermal decomposition that occurs at the interfacial region between cavitation bubbles and bulk solution and provides reducing radicals. Transmission electron microscopy (TEM) photographs showed spherical particles whose size had a fairly narrow distribution with a geometric mean diameter about 8 nm and a geometric standard deviation of 1.1. Analyses with UV−vis spectra indicated that Au(III) ions were first reduced and after their consumption reduction of Pd(II) ions set in. A core−shell structure of the particles, a core of gold and a shell of palladium, was confirmed by high-resolution TEM and X-ray diffraction.

Green Biosynthesis of Spherical Silver Nanoparticles by Using Date Palm (Phoenix Dactylifera) Fruit Extract and Study of Their Antibacterial and Catalytic Activities

“…6 Several synthetic strategies have been developed for the synthesis of Ag NPs including photochemical, 7 sonochemical, 8 sovothermal 9 and spin coating methods. 10 Among these, chemical reduction of a silver ions (Ag + ) in presence of a stabilizer is the most frequently applied method for the preparation of Ag NPs as stable colloidal dispersions in water or organic solvents.…”

Preparation of Ag-Cu Composite Nanoparticles by the Submerged Arc Discharge Method in Aqueous Media

“…14) Mizukoshi and Nagata adopted an ultrasonic resonance method to obtain gold-palladium core-shell nanoparticles. 15) Delcourt employed a photochemical method to produce goldplatinum and silver-platinum bimetallic nanoparticles. 16) By contrast, Chen utilized the microemulsion method to obtain gold-silver bimetallic nanoparticles.…”

Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

“…Due to their unique properties, nanomaterials are employed in electronic, optical, catalytic, coating, medical and sensor applications [1][2][3]. A plethora of research work has been cited on the synthesis of Ni nanoparticles by various methods such as chemical reduction [4], radiolytic reduction [5], UV photolysis [6], solvent extraction reduction [7], microemulsion technique [8], polyol reduction method [9] and sonochemical decomposition [10]. Among these methods, chemical reduction appears to be the most promising method for the large-scale nanoparticle production, although simple methods for preparing metal-supported nanocatalysts under mild and inexpensive conditions have still not been definitely addressed.…”