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Resonance Raman and IR spectroscopy of aligned carbon nanotube arrays with extremely narrow diameters prepared with molecular catalysts on steel substrates

Sagar Jain, Federico Cesano, Domenica Scarano, Tomas Edvinsson

Physical Chemistry Chemical Physics, Volume: 19, Issue: 45, Pages: 30667 - 30674

Swansea University Author: Sagar Jain

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DOI (Published version): 10.1039/C7CP06973A

Abstract

Carbon nanotubes (CNTs) are considered promising for a large range of emerging technologies ranging from advanced electronics to utilization as nanoreactors. Here we report a controlled facile synthesis of aligned carbon nanotubes with very small dimensions directly grown on steel grid substrate via...

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Published in: Physical Chemistry Chemical Physics
ISSN: 1463-9076 1463-9084
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa36420
Abstract: Carbon nanotubes (CNTs) are considered promising for a large range of emerging technologies ranging from advanced electronics to utilization as nanoreactors. Here we report a controlled facile synthesis of aligned carbon nanotubes with very small dimensions directly grown on steel grid substrate via two-step catalytic chemical vapor deposition (CCVD) of molecular catalyst (Ferrocene) with Ethylene as carbon source. The system is characterized by resonance Raman and show single walled carbon nanotube (SWCNT) arrays composed of 0.80 nm and 1.24 nm semiconducting CNTs, as analyzed with Kataura analysis, approaching the lowest diameters attainable in SWCNTs. The G+ and G- mode splitting, G+ line shapes, and ring breathing modes (RBMs) are analyzed to characterize the CNTs. The approach results in close packed and vertically aligned SWCNT bundles formed into a carbon hair shapes, with some contributions from multiwall CNTs (MWCNTs). IR spectroscopy is utilized to characterize the edge/defect states with the possibilities to form esters and ether bonds in the as-prepared CNTs. The stepwise deposition of catalyst followed by carbon source gives a control over formation of small diameter single walled carbon nanotubes (SWCNT). The utilization of molecular catalysts for narrow diameter growth directly on steel grid substrates forms a promising approach for producing cost-effective CNT substrates for a plethora of sensing and catalytic applications.
College: Faculty of Science and Engineering
Issue: 45
Start Page: 30667
End Page: 30674

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