Effect of different metal deposition methods on the growth behaviors of carbon nanotubes

Jung Inn Sohn, Young Woo Ok, Tae Yeon Seong, Seonghoon Lee

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    It is generally known that the catalyst particles promote tip or base growth of carbon nanotubes depending on the contact force between the catalyst particles and the substrate. We have investigated the correlation between the growth modes of vertically aligned carbon nanotubes (CNTs) and the adhesion of Ni catalyst particles to the Si substrates. It is shown that Ni films (10 nm thick) deposited by pulsed laser deposition (PLD) and electron beam evaporation are broken up into nanoparticles and/or islands when pretreated in NH3 gas ambient at 850 °C for 20 min. It is found that CNT growth on the PLD substrate proceeds by base growth mode, whereas CNT growth on the electron-beam evaporated substrate is operated by tip growth mode. The different CNT growth behaviors are explained in terms of the difference of the adhesion between the Ni catalyst particles and the substrate due to the different kinetic energy of depositing Ni particles.

    Original languageEnglish
    Article number014301
    JournalJournal of Applied Physics
    Volume102
    Issue number1
    DOIs
    Publication statusPublished - 2007

    Bibliographical note

    Funding Information:
    This work was supported in part by MOE through BK21 program and Seoul R&BD program. The authors thank KOSEF and Center for Nanotubes and Nanostructured Composites for supporting this research. They also acknowledge the student support from the Korea Science and Engineering Foundation through Nano Systems Institute-National Core Research Center.

    ASJC Scopus subject areas

    • General Physics and Astronomy

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