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A critical role of catalyst morphology in low-temperature synthesis of carbon nanotube-transition metal oxide nanocomposite

Title
A critical role of catalyst morphology in low-temperature synthesis of carbon nanotube-transition metal oxide nanocomposite
Authors
Jin, XiaoyanLim, JoohyunHa, YoonhooKwon, Nam HeeShin, HyeyoungKim, In YoungLee, Nam-SukKim, Myung HwaKim, HyungjunHwang, Seong-Ju
Ewha Authors
황성주김명화
SCOPUS Author ID
황성주scopus; 김명화scopusscopus
Issue Date
2017
Journal Title
NANOSCALE
ISSN
2040-3364JCR Link

2040-3372JCR Link
Citation
NANOSCALE vol. 9, no. 34, pp. 12416 - 12424
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 degrees C, which emphasizes the critical role of the catalyst morphology in CNT growth. Heat treatment of the MnO2 nanosheets under a C2H2 flow induced the deposition of CNT, as well as a phase transition to a 2D ordered assembly of MnO nanoparticles. The resulting CNT-MnO nanocomposites displayed excellent functionalities in Li-ion electrodes with huge discharge capacities and good rate characteristics, which highlights the usefulness of the present method for studying functional CNT-metal oxide nanocomposites. Electron microscopy and density functional theory calculations propose a formation mechanism via the efficient adsorption of carbon on the MnO2 nanosheets followed by the surface diffusion of carbon. It is of prime importance that the substitution of Fe for layered MnO2 nanosheets remarkably improved the efficiency of the formation of CNT by enhancing the surface adsorption of carbon species. This is the first report of the efficient growth of CNT at a very low temperature of 400 degrees C. The universal merit of the 2D nanosheet morphology was confirmed by the successful synthesis of a CNT-TiO2 nanocomposite with exfoliated titanate nanosheets. The present study demonstrates that employing exfoliated transition metal oxide nanosheets as catalysts provides an efficient low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites.
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DOI
10.1039/c7nr03598e
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자연과학대학 > 화학·나노과학전공 > Journal papers
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