Site-selective synthesis of in situ Ni-filled multi-walled carbon nanotubes using Ni(salen) as a catalyst source.
The synthesis of Ni-filled multi-walled carbon nanotubes was performed by atmospheric pressure chemical vapor deposition with propane on Si at 850 °C using a simple mixture of (N, N'-bis(salicylidene)-ethylenediiminato) nickel(II), commonly known as Ni(salen), and a conventional photoresist. Analysis of the carbon nanotubes using scanning electron microscopy together with high-resolution transmission electron microscopy show that the nanotubes have grown by a tip-growth mechanism and exhibit a multi-walled structure with partial Ni filling. The high quality of the Ni-filled nanotubes is evidenced by Raman spectroscopy. The magnetic properties of Ni-filled nanotubes were analyzed using a superconducting quantum interference device which revealed their ferromagnetic behavior with large coercivity. A scalable as well as site-selective growth of high quality Ni-filled carbon nanotubes is achieved by a simple photolithographic method.
Sengupta
Joydip
J
Materials Science Centre, Indian Institute of Technology, Kharagpur, India.
Jana
Avijit
A
Singh
N D Pradeep
ND
Mitra
C
C
Jacob
Chacko
C