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Effect of acetic acid on amorphous carbon removal along a CNT synthesis reactor

A. A. KHODADADI1, M. MAGHREBI1,* , Y. MORTAZAVI2, A. SANE1, Y. SHIRAZI1, M. RAHIMI1, Z. TSAKADZE3, S. MHAISALKAR3

Affiliation

  1. Catalysis & Nanostructured Lab, School of Chemical Engineering, University of Tehran, Tehran, Iran
  2. Nanoelectronics Centre of Excellence, University of Tehran, POB 11365-4563, Tehran, Iran
  3. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore

Abstract

The mm-long carbon nanotubes (CNTs) arrays were grown in a xylene-ferrocene reactor, and subjected to extensive characterization in different longitudinal positions of reactor and upon addition of small amount of acetic acid. Through optical microscopy, Raman spectroscopy, FESEM, XRD and HRTEM characterizations, it was consistently revealed that acetic acid alleviates amorphous carbon layer, which gradually thickens CNTs along the reactor. The added acetic acid also resulted in higher growth rate along the so-called growth window. HPLC of extracted byproducts confirmed the presence of some polycyclic aromatic hydrocarbons. The solid weight of these byproducts decreased upon addition of catalyst precursor, as well as acetic acid to pure xylene feed. The results suggest that primary light products of xylene pyrolysis can be competitive feeds for both catalytic and subsequent pyrolytic reactions. They may also be more efficient feeds for CNTs growth than xylene itself..

Keywords

Carbon nanotubes, mm-long array, Longitudinal study of reactor, Growth window, Acetic acid, Amorphous carbon.

Submitted at: Oct. 16, 2009
Accepted at: Nov. 19, 2009

Citation

A. A. KHODADADI, M. MAGHREBI, Y. MORTAZAVI, A. SANE, Y. SHIRAZI, M. RAHIMI, Z. TSAKADZE, S. MHAISALKAR, Effect of acetic acid on amorphous carbon removal along a CNT synthesis reactor, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 11, pp. 1611-1617 (2009)