Universiti Teknologi Malaysia Institutional Repository

Influence of catalyst preparation on synthesis of multi-walled carbon nanotubes

Ismail, Ahmad Fauzi and Tee, Jia Chee and Aziz, Madzlan (2007) Influence of catalyst preparation on synthesis of multi-walled carbon nanotubes. In: Nanotech Malaysia 2007 & 4th Asia Nano Forum Summit 2007, 2007, PWTC, Kuala Lumpur.

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Abstract

lumina supported cobalt-ferrum catalysts were prepared using wet impregnation method by applying 3 different conditions, namely hotplate (A), sonication (B) and soaking (C). The alumina supported cobalt-ferrum catalysts were applied in the synthesis of multi-walled carbon nanotubes (MWNTs) using catalytic chemical vapour deposition (CCVD) technique. The morphology and particle size of the cobalt-ferrum catalysts and the MWNTs yield were examined by field emission-scanning electron microscopy (FE-SEM) while the surface elemental composition of the samples was obtained by energy dispersive X-ray analysis (EDX). The morphology of catalysts A, B and C were found to be different, the particle sizes were ranged from 20-40 nm. The diameters of the MWNTs yield from samples A, B and C were found to be related to the catalyst particle size, thus the smaller the catalyst particle, the thinner the MWNTs obtained. The MWNTs with smaller diameter were obtained with higher purity and quality becuase the nanotube surface are free from amorphous carbon. Therefore, different catalyst preparation methods resulted in different sizes of the catalyst particle in order to synthesize MWNTs with desired diameter.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:alumina supported cobalt-ferrum catalysts, catalyst particle size, catalyst preparation
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:24449
Deposited By:INVALID USER
Deposited On:18 Apr 2012 05:38
Last Modified:03 Aug 2017 01:43

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