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Type: Artigo de periódico
Title: Synthesis of carbon nanotubes directly over TEM grids aiming the study of nucleation and growth mechanisms
Author: Verissimo, C
Gobbi, AL
Moshkalev, SA
Abstract: A novel approach to produce electron-transparent multi-layer membranes over TEM grids for transmission electron microscopy analysis is presented. The membranes have been used to grow and analyze carbon nanostructured materials in a thermal-chemical vapor deposition process using Ni and Cu as catalysts and silicon oxide thin films as support layers, at temperatures as high as 900 degrees C. It is important that conditions of the synthesis using the electron-transparent multi-layer membrane system are similar to those for a conventional chemical vapor deposition process, where oxidized silicon wafers are employed. In particular, the thickness of the silicon oxide and the catalyst layers are the same, and similar carbon tubular structures were grown using both substrates. The use of membranes was crucial especially for the study of the nucleation mechanism for carbon nanotubes. These electron-transparent multi-layer membranes are relatively easy to obtain and they can be used for transmission electron microscopy studies of high-temperature synthesis of different nanostructured materials. (C) 2008 Elsevier B.V. All rights reserved.
Subject: carbon nanotubes
chemical vapor deposition
methane decomposition
nickel and copper catalysts
scanning and transmission electron microscopy
electron-transparent multi-layer membranes
Country: Holanda
Editor: Elsevier Science Bv
Citation: Applied Surface Science. Elsevier Science Bv, v. 254, n. 13, n. 3890, n. 3895, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.apsusc.2007.12.009
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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