Abstract
Active carbon was used as substrate for the CVD of iron in a fluidized-bed reactor. Carbon nanotubes were subsequently grown from ethylene to obtain CNT-AC composites. The functionalization of the carbon composite was performed by conventional HNO3 treatment in liquid phase and by a recently developed treatment method using HNO3 vapor. The CVD of Pt was carried out with two different precursors, i.e., Pt(acac)2 and (CH3)3Pt(C5H5). One-step CVD in a fluidized-bed reactor was compared with two-step CVD in a fixed-bed reactor. X-ray diffraction, scanning and transmission electron microscopy, online mass spectrometry and X-ray photoelectron spectroscopy were employed for the characterization of the samples. It was found that the HNO3 vapor treatment was not only more effective in oxygen functionalization, but also more reliable for maintaining the structure/morphology of the hierarchical carbon composite. Highly dispersed Pt nanoparticles supported on CNT-AC were achieved by two-step CVD from (CH3)3Pt(C5H5) in a fixed-bed reactor.
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