Nanoscopic Metal Particles − Synthetic Methods and Potential Applications

Abstract

Mono-and bimetallic colloidal particles have gained increasing attention in science and application throughout the last several years. In this contribution, we present a synopsis of the wet chemical syntheses of these materials and survey po- [a] 2455 tential applications in catalysis and materials science. Methods for the characterization of these particles and their surfaces are not reviewed here.potential of nanostructured metal colloids as fuel cell catalysts. [17Ϫ20] Eur.

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

“…The particle size histogram (upper inset), showed that the standard deviation from the average size was less then 20%, consistent with the definition of a monomodal distribution used in chemical synthesis routes. 53 Such histograms allowed accurate determination of particle diameter.…”

Magnetooptics of opal crystals modified by cobalt nanoparticles

“…2(b, c)) it follows that the size of Co NPs is of order of 1 and 8 nm for smaller and larger particles, respectively. As is well known [13], physical properties of metal NPs fabricated by chemical reduction technique depend strongly on the formation conditions, which hence determine the morphology, chemical composition, and crystal structure of NPs. The investigations of temperature and field dependence of magnetization of hybrid opal samples have revealed the correlation between the magnetic properties and formation technology of Co NPs.…”

“…The Co NPs were formed inside the synthetic bulk opal samples by chemical reduction technique [13]. The presence of silanol groups on the surface of SiO 2 spheres [14] favours the formation of metal NPs.…”

Anode Catalysts for Low‐Temperature Direct Alcohol Fuel Cells

“…In contrast to physical methods, chemical methods are more flexible to precisely control the particle size, shape, and structure [124]. Recently, wet chemical synthesis approaches have emerged as one of the most promising methods to accurately control size, shape, structure, and surface facets of metallic nanostructures [118,[124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140]; thus, they hold great potential for serving as high-performance catalysts. A typical wet chemical synthesis involves chemical reduction of dissoluble metal precursors in aqueous or organic phase to nucleus, controlled growth to the finally desired metal nanoparticles in the presence/absence of stabilizing agents and deposition on appropriate carbon supports.…”

“…The colloid method is a widely adopted method for preparing metallic nanoparticles with precisely controlled size, shapes, and structures [125][126][127][128][129][130][131][132][133][134][135][137][138][139][140][141]. This method includes preparation of metallic colloids first and subsequent deposition on carbon support.…”