Issue 6, 2013

Low-temperature growth of bamboo-like multi-walled carbon nanotubes over an atomic layer epitaxy-Cu/SiO2catalystvia metal-support interaction

Abstract

The well-controlled growth of carbon nanotubes (CNTs) at low temperature (< 1073 K) using non-iron group metal catalysts remains a challenge. Here, we report that CNTs can be grown at 773–1173 K over an atomic layer epitaxy (ALE) prepared copper catalyst (ALE-Cu/SiO2) using chemical vapour deposition in helium diluted ethylene. At the same reaction conditions, only amorphous carbon can be generated over an impregnation (IM) method prepared copper catalyst (IM-Cu/SiO2). A metal-support interaction (MSI) model is proposed to describe the interaction between the ALE prepared Cu nanoparticles (NPs) and SiO2 support through the results of temperature programmed reduction profiles, X-ray photoelectron spectra and in situ X-ray diffraction (XRD) patterns. Structurally stabilised CuNPs in ALE-Cu/SiO2 catalyst indicate that the strong MSI site of CuNPs and/or copper silicide (Cu3Si) evidenced by in situ XRD patterns would be the active centers to fabricate CNTs. Our observations provide new insights into controlling the CNT growth at low-temperatures over non-ferromagnetic catalysts.

Graphical abstract: Low-temperature growth of bamboo-like multi-walled carbon nanotubes over an atomic layer epitaxy-Cu/SiO2 catalyst via metal-support interaction

Article information

Article type
Paper
Submitted
31 Jul 2012
Accepted
22 Nov 2012
First published
22 Nov 2012

RSC Adv., 2013,3, 1808-1817

Low-temperature growth of bamboo-like multi-walled carbon nanotubes over an atomic layer epitaxy-Cu/SiO2 catalyst via metal-support interaction

J. Lin, Z. Zeng, Y. Lai and C. Chen, RSC Adv., 2013, 3, 1808 DOI: 10.1039/C2RA22591C

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