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Organometallic nanoparticle precursor

The nanostructures synthesis from organometallic unstable precursors can occur under controlled conditions. As a result, the nanoparticles have been specified by size, its distribution, stoichiometry and shape. The choice of organometallic compounds ligands can not only define the character of resulting cationic complex inorganic phases, the morphology of future nanoparticles (spheres, rods, cubes, wires), but can also affect their self-organization in one-, two-and three-dimensional clusters [338]. This approach is fruitful for the synthesis of nanoparticles of metals and alloys, simple and multication oxides and other compounds that exhibit ferroic properties. [Pg.351]

J. Hambrock, A. Birkner, R.A. Fischer, Synthesis of CdSe nanoparticles using various organometallic cadmium precursors, J. Mater. Chem. 11 (2001) 3197-3201. [Pg.218]

The most intensive development of the nanoparticle area concerns the synthesis of metal particles for applications in physics or in micro/nano-electronics generally. Besides the use of physical techniques such as atom evaporation, synthetic techniques based on salt reduction or compound precipitation (oxides, sulfides, selenides, etc.) have been developed, and associated, in general, to a kinetic control of the reaction using high temperatures, slow addition of reactants, or use of micelles as nanoreactors [15-20]. Organometallic compounds have also previously been used as material precursors in high temperature decomposition processes, for example in chemical vapor deposition [21]. Metal carbonyls have been widely used as precursors of metals either in the gas phase (OMCVD for the deposition of films or nanoparticles) or in solution for the synthesis after thermal treatment [22], UV irradiation or sonolysis [23,24] of fine powders or metal nanoparticles. [Pg.234]

Recently, Dupont and coworkers described the use of room-temperature imi-dazolium ionic liquids for the formation and stabilization of transition-metal nanoparticles. The potential interest in the use of ionic liquids is to promote a bi-phasic organic-organic catalytic system for a recycling process. The mixture forms a two-phase system consisting of a lower phase which contains the nanocatalyst in the ionic liquid, and an upper phase which contains the organic products. Rhodium and iridium [105], platinum [73] or ruthenium [74] nanoparticles were prepared from various salts or organometallic precursors in dry 1-bu-tyl-3-methylimidazolium hexafluorophosphate (BMI PF6) ionic liquid under hydrogen pressure (4 bar) at 75 °C. Nanoparticles with a mean diameter of 2-3 nm... [Pg.243]

Scheme 15.3 Preparation of soluble iridium nanoparticles from in situ reduction of the organometallic precursor [ir(COD)Cl]2 in imidazolium ionic liquids. Scheme 15.3 Preparation of soluble iridium nanoparticles from in situ reduction of the organometallic precursor [ir(COD)Cl]2 in imidazolium ionic liquids.
Similar to chemical vapor deposition, reactants or precursors for chemical vapor synthesis are volatile metal-organics, carbonyls, hydrides, chlorides, etc. delivered to the hot-wall reactor as a vapor. A typical laboratory reactor consists of a precursor delivery system, a reaction zone, a particle collector, and a pumping system. Modification of the precursor delivery system and the reaction zone allows synthesis of pure oxide, doped oxide, or multi-component nanoparticles. For example, copper nanoparticles can be prepared from copper acetylacetone complexes [70], while europium doped yttiria can be obtained from their organometallic precursors [71]. [Pg.384]

This method involves the thermolysis of organometallic or metal organic precursors in a high-boiling solvent. Mostly this solvent is also a capping agent for the nanoparticles. A typical synthetic route for monodisperse nanoparticles is shown in Fig. 1. [Pg.177]

MetalHc cobalt nanoparticles were synthesized by the decomposition of THE solution of an organometallic precursor Colij -CgHia) )[197]... [Pg.196]


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See also in sourсe #XX -- [ Pg.173 , Pg.177 ]




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Nanoparticles organometallic precursors

Nanoparticles organometallic precursors

Organometallic precursors

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