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Photoreduction of graphene oxide (GO) to reduced graphene oxide (rGO) under ambient conditions was evaluated for three laser processing approaches: 800 nm fs pulses, 248 nm ns pulses, and 788 nm continuous wave (CW) illumination. Resultant features were compared using Raman, XPS, optical profilometry and SEM. The most effective approach for photoreduction and graphenization with minimal defects was...
We demonstrate the growth of high quality single-walled carbon nanotube (SWCNT) forests on commercial Cu foils by cold-wall chemical vapor deposition. Time-of-flight secondary ion mass spectrometry was employed to study the effect of annealing on the catalyst evolution with or without an AlOx barrier layer. X-ray photoelectron spectroscopy was used to investigate the chemical states of the catalyst...
We report the growth of vertically-aligned nanotube forests, of up to 0.2mm in height, on an 85:15 sp2:sp3 carbon support with Fe catalyst. This is achieved by purely-thermal chemical vapour deposition with the catalyst pretreated in inert environments. Pretreating the catalyst in a reducing atmosphere causes catalyst diffusion into the support and the growth of defective tubes. Other sp2:sp3 compositions,...
We demonstrate the direct growth of carbon nanotube (CNT) forests on metallic titanium (Ti) coatings by single-step chemical vapor deposition. This was achieved by catalyst engineering, which involves a novel design of Fe/Ti/Fe nanostructure sputtering coated on SiO 2 /Si wafers. The Fe sublayer, an additional catalyst added to the conventional catalyst/support design, plays a key role in...
We present temperature gradient chemical vapor deposition (TG CVD) for producing vertically aligned (VA-) carbon nanotubes (CNTs). Independent heaters on the gas inlet and catalyst substrate sides of a cold-wall, vertical CVD reactor can modulate the gas temperature gradient to lead to controlled thermal histories of acetylene precursor. Our growth results reveal that such a precursor thermal history...
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