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In this paper, the presence of a considerable number of Co (3–4nm) and Pd (1–4nm) particles in the inner tube (4–9nm inner diameter) of carbon nanofibers is demonstrated with TEM and XPS. Oxidation of freshly grown fibers in nitric acid resulted in opening of the inner tube of the fibers and in creating adsorption sites on the internal and external surface of the fibers needed for anchoring of the...
The effect of liquid-phase oxidation on the texture and surface properties of carbon nanofibers has been studied using XRD, TEM, SEM, N 2 -physisorption, TGA-MS, XPS and acid-base titrations. Oxidation was performed by refluxing the nanofibers in HNO 3 and mixtures of HNO 3 /H 2 SO 4 for different times. The graphite-like structure of the treated fibers remained...
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