Journal
NANOMATERIALS
Volume 12, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/nano12010109
Keywords
graphene; hot filament chemical vapor deposition; copper catalytic effect
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This study reports the direct synthesis of graphene on SiO2/Si using hot-filament chemical vapor deposition. The results show the growth of few-layers of graphene over the entire SiO2/Si substrate, far beyond the catalytic copper-strip.
We report the first direct synthesis of graphene on SiO2/Si by hot-filament chemical vapor deposition. Graphene deposition was conducted at low pressures (35 Torr) with a mixture of methane/hydrogen and a substrate temperature of 970 degrees C followed by spontaneous cooling to room temperature. A thin copper-strip was deposited in the middle of the SiO2/Si substrate as catalytic material. Raman spectroscopy mapping and atomic force microscopy measurements indicate the growth of few-layers of graphene over the entire SiO2/Si substrate, far beyond the thin copper-strip, while X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy showed negligible amounts of copper next to the initially deposited strip. The scale of the graphene nanocrystal was estimated by Raman spectroscopy and scanning electron microscopy.
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