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Inoculation of silicon nanoparticles with silver atoms.

ABSTRACT: Silicon (Si) nanoparticles were coated inflight with silver (Ag) atoms using a novel method to prepare multicomponent heterostructured metal-semiconductor nanoparticles. Molecular dynamics (MD) computer simulations were employed, supported by high-resolution bright field (BF) transmission electron microscopy (HRTEM) and aberration-corrected scanning transmission electron microscopy (STEM) with a resolution ?0.1?nm in high angle annular dark field (HAADF) mode. These studies revealed that the alloying behavior and phase dynamics during the coating process are more complex than when attaching hetero-atoms to preformed nanoparticles. According to the MD simulations, Ag atoms condense, nucleate and diffuse into the liquid Si nanoparticles in a process that we term "inoculation", and a phase transition begins. Subsequent solidification involves an intermediate alloying stage that enabled us to control the microstructure and crystallinity of the solidified hybrid heterostructured nanoparticles.

SUBMITTER: Cassidy C

PROVIDER: S-EPMC3812657 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature

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Inoculation of silicon nanoparticles with silver atoms.

Cassidy Cathal C Singh Vidyadhar V Grammatikopoulos Panagiotis P Djurabekova Flyura F Nordlund Kai K Sowwan Mukhles M

Scientific reports 20131030

Silicon (Si) nanoparticles were coated inflight with silver (Ag) atoms using a novel method to prepare multicomponent heterostructured metal-semiconductor nanoparticles. Molecular dynamics (MD) computer simulations were employed, supported by high-resolution bright field (BF) transmission electron microscopy (HRTEM) and aberration-corrected scanning transmission electron microscopy (STEM) with a resolution ≤0.1 nm in high angle annular dark field (HAADF) mode. These studies revealed that the all ...[more]

PMID: 24170178

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