Paper NS+AS+SS-TuA11
A Study of Single-Walled Carbon Nanotubes Coated with Iron Oxide (Fe₂O₃) Nanoparticles for Enhanced Magnetic Properties

Tuesday, November 11, 2014, 5:40 pm, Room 304

Carbon nanotubes (CNTs) continue to attract significant interest due to their extraordinary thermal, electrical, optical, and mechanical properties. The preparation of CNTs coated with magnetically sensitive Fe₂O₃ nanoparticles has implications to the development of advanced heat transfer nanofluids and high capacity lithium ion batteries. In this report, single-walled carbon nanotubes (SWNTs) were uniformly coated with Fe₂O₃ nanoparticles through solution mixture. Scanning and transmission electron microscopy were used to compare the surface morphology of pristine SWNTs and as-prepared SWNTs coated with Fe₂O₃ nanoparticles. Raman spectroscopy and thermo gravimetric analysis presented the extent of defects and the amount of Fe₂O₃ nanoparticles present in the sample. Near edge X-ray absorption fine structure spectroscopy was used to probe the electronic band structure of as-prepared core-shell structures. Magnetization measurements indicate that the coercive field of SWNTs coated with Fe₂O₃ nanoparticles was twice that of pristine SWNTs.

One of the authors, D. S., acknowledges funding from ARL W911NF-12-2-0041 and from NSF MRI-DMR-1337339