Low-Field Emission from Iron Oxide-Filled Carbon Nanotube Arrays

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2005,（4）
• 页码范围: 911-914
• 页数: 4页
• 语种: 英文

摘要

Arrays of multi-walled carbon nanotubes (MWCNTs) filled with iron oxide have been fabricated by a one-step route based on the pyrolysis of ferrocene under a well-chosen synthesis condition.The MWCNT arrays were observed with a scanning electron microscope, with which an energy dispersive x-ray spectrum (EDXS) was also acquired, and they are analysed by x-ray diffraction.Furthermore, individual MWCNTs were studied by using selected area electron diffraction (SAED) and the EDXS in a transmission electron microscopy observation.All the observation and analysis confirmed that the MWCNTs were filled with iron oxide.Field emission from these arrays of iron oxide-filled MWCNTs was measured and the turn-on field was determined to range from 0.83-1.01 V/μm, appearing to be much lower than those of arrays of pure MWCNTs and arrays of nitrogen-doped MWCNTs fabricated in similar ways.The possible reasons of the observed low-field emission are discussed.