Synthesis of Nickel and Cobalt Filled Multi- walled Carbon Nanotubes and their Detailed Structural Analysis

In the present work, nickel and cobalt filled multi-walled carbon nanotubes were synthesized by microwave plasma chemical vapor deposition (MPCVD) technique. As-grown nickel and cobalt filled carbon nanotubes (CNTs) were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), selective area diffraction (SAD) and Raman spectroscopy. A proposed growth mechanism for the synthesis of nickel and cobalt filled carbon nanotube has been discussed. Nearly one micron thick layer of electroplated nickel and cobalt on copper substrates has been used as a starting catalyst. Ammonia plasma pre-treatment at 350 - 6000C for 10 seconds of the catalyst layer results in the formation of nanoclusters of nickel and cobalt as observed in atomic force microscopy and scanning electron microscopy. Nickel or cobalt filled multi-walled carbon nanotubes are deposited insitu on plasma treated substrates using CH4 and H2 precursor gases in MPCVD apparatus. The flow rates of CH4 and H2 gases are 6 and 40 sccm, respectively. More Info

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