Investigation on Sized-Regulated Iron Nanoparticles Prepared by Liquid Phase Plasma Reduction Process

Abstract

The liquid-phase plasma reduction method has been applied to prepare iron nanoparticles from iron chloride solution using a bipolar pulsed electrical discharge system. The excited states of atomic iron, hydrogen, and oxygen as well as the molecular bands of hydroxyl radicals were detected in the emission spectra. The iron nanoclusters formed at the initial stage convert to dispersion of small iron nanoparticles, which then grows slowly to form anisotropic, tetragonal shape. The cationic surfactant of CTAB was shown to exhibit a large influence on the particle generation procedure.

Characterization of Bimetallic Fe-Ru Oxide Nanoparticles Prepared by Liquid-Phase Plasma Method

“…This was estimated that it could be attributable to the oxidation of metal particles by active oxidizing species ( 1 O 2 , O − 2 , O•, OH•, HO 2 , H 2 O 2 , and O 3 ) which were generated by the LPP reaction. In our previous study [ 15 ], the prevention of an oxidation of iron metal particles into iron oxide particles by ethanol employed as a solvent instead of water for the preparation of reactant solution was identified. And accordingly, the possible preparation of bimetallic Fe-Ru nanoparticles by an application of ethanol as a solvent can also be presumable.…”

“…The LPP system exploited the power supply (Nano Technology Inc.; NTI-500 W) of high-frequency bipolar pulse which was also used in this study to produce particles from the precursors. The employed LPP system was identical to the one employed in our previous studies [ 15 – 17 ] from which the details of the employed LPP system can be referred to. The conditions of the voltage, frequency, and pulse width set for the creation of plasma were fixed as 250 V, 30 kHz, and 5 μ, respectively.…”

“…The LPP process can produce diverse metals and metal oxide nanoparticles simply by the reduction reaction using electrons and ions which are to be generated in an aqueous solution by plasma [ 14 ]. In our previous studies, the cases of successful synthesis of diverse metal nanoparticles including iron nanoparticles through the use of LPP process are reported [ 15 – 17 ]. In addition, the result of improved performance of the electrochemical capacitor electrode produced by employing the nanoparticles synthesized through the LPP process is also reported [ 18 ].…”