Abstract
Fe−Co composition gradient and Fe−Pt multilayer alloy films were tested as catalysts for groving vertically aligned carbon nanofibers (VACNFs) by plasma-enhanced chemical vapor deposition (PECVD). The Fe−Co film yielded nanofibers with alloy tips in a wide compositional range varying from 8.15 pct Fe at the Co-rich end to 46.29 pct Fe in the middle of the wafer as determined by energy-dispersive X-ray analysis. Two Fe−Co cubic phases (SG Pm3m, \({\text{P}}m\overline 3 m\) were identified by preliminary X-ray diffraction (XRD) measurements. Magnetic measurements showed a substantially greater hysteresis loop area and coercivity in Fe−Co catalyst nanoparticles as compared to the asdeposited Fe−Co film. The Fe−Pt film did not break into FePt alloy nanoparticles under the applied processing parameters and thus the utility of FePt as a VACNF catalyst has been inconclusive.
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