Abstract
Arrays of multi-walled carbon nanotubes (MWCNTs) filled with iron oxidehave been fabricated by a one-step route based on the pyrolysis offerrocene under a well-chosen synthesis condition. The MWCNT arrayswere observed with a scanning electron microscope, with which an energydispersive x-ray spectrum (EDXS) was also acquired, and they areanalysed by x-ray diffraction. Furthermore, individual MWCNTs werestudied by using selected area electron diffraction (SAED) and the EDXSin a transmission electron microscopy observation. All the observationand analysis confirmed that the MWCNTs were filled with iron oxide.Field emission from these arrays of iron oxide-filled MWCNTs wasmeasured and the turn-on field was determined to range from0.83–1.01 V/μm, appearing to be much lower than those of arrays ofpure MWCNTs and arrays of nitrogen-doped MWCNTs fabricated in similarways. The possible reasons of the observed low-field emission arediscussed.
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