Microscopical study of Au nanocrystals self-assembled on (100)Si and SiO2/(100)Si substrates

Emanuela Piscopiello, Leander Tapfer, Marco Vittori Antisari, Pasquale Paiano, Paola Prete, Nicola Lovergine

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Abstract

This work reports on the structural characterization of Au nanocrystals directly prepared on the surface of (100)Si and 150 nm-thick SiO2 deposited (100)Si substrates, by a physical self-assembly method, consisting in the UHV evaporation of a thin Au film and its successive high temperature annealing. The morphology, orientation, and crystalline structure of Au nanocrystals were characterized by scanning and high-resolution transmission electron microscopy and X-ray diffraction, respectively. Experimental results show that the nature of the substrate strongly influences the process of Au nanocrystal formation upon heat treatment, by affecting the interaction of deposited Au with the underlying material. In the case of clean (100)Si substrates the Au strongly interacts with Si, so that Au nanoislands are obtained with a well defined epitaxial relationships with the substrate, i.e. [100]AuII[110]Si and [110]AuII[311]Si. The nanoisland shape is affected by faceting at the Au/Si interface, the Au nanocrystal being limited by the {111}, {311}, {711} and {-111} planes of Si. In the case of SiO2/(100)Si substrates spherical shaped Au nanoparticles with random crystal orientation are instead, produced. © 2007 Materials Research Society.
Original languageEnglish
Publication statusPublished - 2007
Externally publishedYes
Event2006 MRS Fall Meeting - , United States
Duration: 1 Jan 2007 → …

Conference

Conference2006 MRS Fall Meeting
CountryUnited States
Period1/1/07 → …

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

Piscopiello, E., Tapfer, L., Antisari, M. V., Paiano, P., Prete, P., & Lovergine, N. (2007). Microscopical study of Au nanocrystals self-assembled on (100)Si and SiO2/(100)Si substrates. Paper presented at 2006 MRS Fall Meeting, United States.