In this paper, we report a kind of novel belt-like nanostructure of iron silicide, which we call nanobars, synthesized on silicon (001) substrate by microwave plasma method. The iron silicide nanobars were found to be of metallic α-FeSi2 with tetragonal symmetry (a=b=0.2695nm and c=0.5390nm) by energy dispersive X-ray spectrometry (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques. The scanning electron microscope (SEM) morphology indicates that the nanobars, with lengths typically up to several micrometres, widths in the range of 20-200 nm and thickness of 10-100 nm, self-assembly align along <110> directions on (001) silicon substrate and form network structure. The possible self-assembly growth mechanism of iron silicide nanobars was discussed. It is suggested that the optimal matching directions, the reconstruction in high temperature, and the interaction between original depositional iron nanoparticles by the magnetization of microwave magnetic field are the three factors that caused the formation and orientation of iron silicide nanobars. The special structure and self-assembly growth mechanism of iron silicide nanobars might be used in MEMS and NEMS fabricating or self-assembling carbon nanotubes integrated nanocircuits from the bottom up.
The development of photon devices requires the materials with high optical response speed. A type of composite thin films composed of nano-scale Ag particles and barium oxide medium was fabricated. There were two methods in the formation of the thin films: single metallic layer method and triple metallic layer method. The thickness of the thin films in different formation methods was approximately 150 nm or 300 nm, while, Ag particles had an average diameter of 20 nm or 15 nm. A pump-probe method was used for measuring the transient change of optical transmissivity of thin films which were stimulated by ultrashort laser pulses of duration 150 fs and wavelength 647 nm. The Ag-BaO thin films presented that the transmissivity increased rapidly.
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