A hot-wire chemical vapor deposition (HWCVD) method for metal oxide and their alloy nanowire arrays

Highly Crystalline WO3 Nanoparticles Are Nontoxic to Stem Cells and Cancer Cells

“…Several sophisticated approaches have been developed for the synthesis of WO 3 nanostructures using vapour-, liquid-, and solid-phase (both "wet" and "dry") methods [19]. The vapour-phase route can be realized via laser ablation [64], electron beam irradiation [65], ion bombardment [66], or heat treatment [67] of tungsten-based materials; these techniques are used primarily for the production of nanostructured films and include such processes as sputtering [68] and thermal evaporation (including hot-wire [69,70] and arc discharge vaporization [71] and spray pyrolysis [72][73][74]). The key liquid-phase approaches for the synthesis of WO 3 nanoparticles include precipitation with acids [75], hydro-or solvothermal treatment (using aqueous [76][77][78], nonaqueous [20,79], or mixed [80] solvents), sol-gel processing (both in aqueous [81,82] and in nonaqueous [83] systems), reverse microemulsion-mediated routes [84][85][86][87], and soft [21,88] and hard [89] templating (including electrodeposition [90]).…”

Rapid Synthesis of Thin and Long Mo17O47 Nanowire-Arrays in an Oxygen Deficient Flame

“…This process is similar to the possibility we have described in the present study, in which MoO 2 vapors can adsorb and then undergo oxidation to MoO 3 before being incorporated into the Mo 17 O 47 nanowires. Another study similarly examined the vapor deposition of molybdenum trioxide (MoO 3 ) nanowires and tubular structures by the generation of molybdenum oxide vapors from a hot molybdenum filament in the presence of O 2 gas in a vacuum tube furnace, and the subsequent deposition of these vapors onto a substrate 44 , but did not provide analysis of the partial pressures or roles of MoO 2 and MoO 3 , as has been done here. These prior studies on tungsten and molybdenum oxides additionally hypothesized that under the conditions of excess WO 2 or MoO 2 , the deposited WO 2 or MoO 2 would lead to the formation of a “sub-oxide cluster”, which directs the one-dimensional (anisotropic) vapor-solid growth of the nanowires 42 44 .…”

High rate and durable, binder free anode based on silicon loaded MoO3 nanoplatelets

“…A bias of 17 volts AC was applied to the molybdenum filament (0.5 mm in diameter and 6 ft in length) resistively heating it to temperature of about 800 °C. Further details of the experimental setup used for these deposition experiments are given in previous publications 5 30 31 . The mass of the MoO 3 deposit in mg was calculated by subtracting the initial mass of the substrate from the final mass of each sample.…”