In this study, iron silicon oxide particles were generated in a onestep flame assisted spray pyrolysis (FASP) process using H 2 /air or H 2 /O 2 diffusion flames. A colloidal precursor solution was used, which contained dissolved iron nitrate and stably suspended silica nanoparticles. H 2 /air flames resulted in magnetic Fe x O y /silica core-shell particles. There was a correlation between particle size and particle structure; particles larger than 500 nm had the coreshell structure, but smaller particles had non-core-shell structures. H 2 /O 2 flames only resulted in nanoparticles that had non-coreshell structures. The core-shell particles had a iron oxide core that was hermetically enclosed in a uniform silica shell with a typical thickness of approximately 100 nm; they were superparamagnetic with a room-temperature saturation magnetization greater than 24 emu/g. Temperature history of the particles may be used to explain the correlation between flame type and particle structure. The correlation between particle size and structure may be due to size-dependent thermodynamic stability of the structures, or kinetics of heat and mass transfer. The results from this study suggest that micrometer sized iron oxide silica core-shell magnetic particles could be generated from a one-step flame aerosol process, but Fe x O y /silica nanoparticles (<100 nm) with the coreshell structure cannot be generated in a one-step flame aerosol process.
Amorphous InGaZnO 4 (a-IGZO) thin film transistors (TFTs) are promising devices in backplane technology. Since a-IGZO TFTs are very sensitive to the fabrication processes, they need stable process to keep their initial deposition properties. Herein we improved the stability of a-IGZO by applying N 2 O plasma. The stability characteristic of a-IGZO TFT was improved with N 2 O plasma. V th shift was 1.5V for 10,000s under NBTS with illumination which was the best result in the world.
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