Colloidal synthesis of an exotic phase of silicon: The BC8 structure

Shreyashi Ganguly, Nasrin Kazem, Danielle Carter, Susan M. Kauzlarich

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Creating allotropes and polymorphs of nanoparticles (NPs) has gained tremendous momentum in recent times. Group 14 (C, Si, Ge) has a number of allotropes; some with significant applications. Here we report the synthesis of Si NPs crystallizing in the BC8 structure via a colloidal route for the first time. The BC8 structure is a metastable structure of Si that can be accessed from the β-Sn form through the release of high pressure. These Si BC8 structured NPs were synthesized via reduction of SiI4 with n-butyllithium, capped with octanol and precipitated from solution. The transmission electron microscopy lattice fringes as well as the selected area electron diffraction pattern of the precipitate are consistent with the BC8 structure. The LeBail whole profile fitting of powder X-ray diffraction data also confirms the structure as the BC8 phase. The Raman spectrum provides further evidence to support the BC8 structure. With proper tuning of the band gap these NPs could be potential candidates for solar cells.

Original languageEnglish (US)
Pages (from-to)1296-1299
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number4
DOIs
StatePublished - Jan 29 2014

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