Abstract
Iron nitride nanostructures were synthesized by pulsed laser ablation in liquid nitrogen using a Nd:YAG laser. According to transmission electron microscopy analyses reveal the formation of single-phase α"-Fe16N2, ζ-Fe2N, and ε-Fe3N nanostructures, or yet, a mixture of them. We demonstrate that these phases can be obtained by varying the fluence for the fundamental mode of laser. These nanostructures can be also produced by irradiating the iron target using the available laser wavelengths, which are the fundamental mode of 1064 nm and the harmonics of 532 nm, 355 nm and 266 nm. Particularly, the crystalline α"-Fe16N2 nanostructures produced with 1064 nm, 532 nm, and 355 nm laser irradiations, indicating a specific effectiveness to obtain such complex iron nitride phase. Noticeably, the α"-Fe16N2 nanostructures produced change from assemblies of nanoparticles with mean size of 4 nm using green laser irradiation to cuboidal shapes with sizes of 200 nm for infrared laser irradiation.
Published Version
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