Laser‐induced synthesis of iron–iron oxide/methylmethoxysilicone nanocomposite

Abstract

The IR laser irradiation of a gaseous mixture of iron pentacarbonyl-methoxytrimethylsilane-ethene in argon induces ethene-photosensitized decomposition of iron pentacarbonyl into elemental iron and decomposition of methyltrimethoxysilane into species that polymerize into methylmethoxysilicone. These two concurrent gas-phase processes allow formation of iron-iron oxide/methylmethoxysilicone nanocomposite. Spectral analyses and electron microscopy reveal the nanocomposite as consisting of iron clusters oxidized in outer layers and covered with the organosilicon polymer. The procedure shows its potential for gas-phase synthesis of iron-based clusters embedded in a polymer matrix.

Novel solid-state synthesis of α-Fe and Fe3O4nanoparticles embedded in a MgO matrix

“…Rarely, noble metals [58,59], graphite [60], carbon nanotubes [61,62], proteins [63], activated charcoal [64], porous clay minerals [65,66], metal phthalocyanine [67] or fullerite C-60 powder [68] have been exploited as matrices, coating agents or magnetic composite forming materials. The spectrum of synthetic routes resulting in iron or iron oxide-based nanocomposites is also very multifarious, including the common ion absorption effect [25], laser-induced decomposition of gaseous Fe precursors [26], the electrospinning process [27], the solvothermal reduction approach [35], simple precipitation methods [40], precipitation combined with hydrothermal treatment [41], ultrasound radiation [46], sol-gel methods [51][52][53], mechanical activation [54,56], electrodeposition process [57] and microemulsion techniques [69].…”

Infrared laser synthesis and properties of magnetic nano-iron-polyoxocarbosilane composites

“…The IR laser irradiation of gaseous iron pentacarbonyl and hexamethyldisiloxane was conducted as described previously, 17 in a flow reactor equipped with NaCl windows and a continuous-wave (CW) CO 2 laser. Briefly, the vapours of iron pentacarbonyl and hexamethyldisiloxane (each diluted with ethene) together with argon (needed for gas and particle confinement) were introduced separately into the reaction chamber through three concentric nozzles at two different flow rates of Fe(CO) 5 (Table 1).…”

“…This procedure was recently documented via IR laser-induced and ethylene-sensitized co-pyrolysis of iron pentacarbonyl and Materials, Nanoscience and Catalysis methoxytrimethylsilane. 17 The concurrent decomposition of iron pentacarbonyl into iron and carbon monoxide and that of the organosilane into methylmethoxysilicone resulted in the formation of nanosized iron-based particles covered with organosilicon polymer.…”

IR laser-induced chemical vapor deposition of carbon-coated iron nanoparticles embedded in polymer

“…Nanomagnetic particles of iron stabilized by polymers have been prepared by sonolysis of iron pentacarbonyl in the presence of poly(dimethylphenyleneoxide) 9 and by IR laser gas-phase co-decomposition of iron pentacarbonyl and methoxytrimethylsilane 10 or hexamethyldisiloxane. 11 The carbon-coated Fe nanoparticles were produced by simply annealing mixtures of nanoparticles of hematite (Fe 2 O 3 ) and carbon to 1200 uC under nitrogen, 12 annealing mixtures of iron and diamond nanoparticles at 1700 uC in vacuum, 13 heating mixtures of mm-sized powders of Fe 3 O 4 and poly(vinyl chloride) at 1000 uC in Ar flow, 14 or by heating mixtures of ferrocene or Fe(CO) 5 with bis(n-propylamine) at above 800 uC in vacuum, 15 by the Kra ¨tschmer-Huffmann carbon-arc method (arc discharge evaporation of an electrode composed of graphite and Fe), 16,17 by an ion beam sputtering technique applied to graphite/iron target 18 and by IR laser co-pyrolysis of Fe(CO) 5 and acetylene.…”