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In situ Transmission Electron Microscopy Study of the growth of Ni Nanoparticles on Amorphous Carbon and of the Graphitization of the Support in the Presence of Hydrogen

Published online by Cambridge University Press:  01 July 2005

R. Anton
R. Anton*
Affiliation:
Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg, Germany
*
a)Address all correspondence to this author. e-mail: ranton@physnet.uni-hamburg.de
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Abstract

In a specially equipped transmission electron microscope (TEM), Ni particles were vapor deposited onto thin films of amorphous carbon (a-C), and subsequent reactions with the carbon support were observed at elevated temperatures. Particles deposited at temperatures around 370 °C developed a graphite shell at above 600 °C and subsequently spread and graphitized the substrate. This activity was enhanced by hydrogen. The speed of graphitization significantly increased during spreading of the metal, which is attributed to the concomitant increase of the length of the reaction front, as well as to a purifying effect of hydrogen. It is concluded that the driving force for spreading of the Ni is the interdiffusion and catalytic conversion of carbonto graphite at the reaction front. Particles deposited at 500 °C remained inactive at670 °C. This is probably due to the formation of a rather stable carbidic or graphitic interlayer during deposition.

Keywords

NanoparticlesSurface reactionTransmission electron microscopy (TEM)

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Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 7 , July 2005 , pp. 1837 - 1843
Copyright
Copyright © Materials Research Society 2005

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