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Researchers from PRESTO Report New Studies and Findings in the Area of Minerals (Self-assembly of Ge clusters on highly oriented pyrolytic graphite...

September 12, 2014



Researchers from PRESTO Report New Studies and Findings in the Area of Minerals (Self-assembly of Ge clusters on highly oriented pyrolytic graphite surfaces)

By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Minerals are presented in a new report. According to news reporting originating from Saitama, Japan, by NewsRx correspondents, research stated, "The self-assembly of Ge clusters on highly oriented pyrolytic graphite (HOPG) was investigated by depositing Ge at various temperatures, using in situ-scanning electron microscopy under an ultrahigh vacuum. At the first stage of Ge deposition, Ge clusters were formed along the steps on the HOPG surfaces."

Our news editors obtained a quote from the research from PRESTO, "With an increase in the amount of Ge deposited, nanostructures of Ge self-assembled depending on the deposition temperature used. At room temperature, the Ge clusters merged together, resulting in the formation of dendritic-shaped structures. At high temperatures (200-600 degrees C), chain structures of Ge clusters were formed along the steps on the HOPG surfaces. The density of the Ge clusters comprising the chains along the chain direction decreased with an increase in the deposition temperature. This can be explained by the diffusion length of the Ge atoms along the steps during chain formation. From this result, an activation energy of similar to 0.12 eV was determined for the diffusion of the Ge atoms along the HOPG steps. Ostwald ripening of the Ge clusters was also observed by annealing the chain structure of the Ge clusters."

According to the news editors, the research concluded: "By analyzing the change in the Ge cluster density in the chains, an activation energy of similar to 0.68 eV was obtained for a movement of Ge cluster periphery by attachment and detachment of Ge atoms."

For more information on this research see: Self-assembly of Ge clusters on highly oriented pyrolytic graphite surfaces. Surface Science, 2014;628():82-85. Surface Science can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Surface Science - www.elsevier.com/wps/product/cws_home/505676)

The news editors report that additional information may be obtained by contacting M. Shimonaka, JST, PRESTO, Kawaguchi, Saitama 3320012, Japan. Additional authors for this research include Y. Nakamura, J. Kikkawa and A. Sakai (see also Minerals).

Keywords for this news article include: Saitama, Japan, Asia, Carbon, Graphite, Minerals

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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