CUED Publications database

Elastic properties of crystalline-amorphous core-shell silicon nanowires

Khachadorian, S and Papagelis, K and Ogata, K and Hofmann, S and Phillips, MR and Thomsen, C (2013) Elastic properties of crystalline-amorphous core-shell silicon nanowires. Journal of Physical Chemistry C, 117. pp. 4219-4226. ISSN 1932-7447

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The pressure behavior of Raman frequencies and line widths of crystalline core-amorphous shell silicon nanowires (SiNWs) with two different core-to-shell ratio thicknesses was studied at pressures up to 8 GPa. The obtained isothermal compressibility (bulk modulus) of SiNWs with a core-to-shell ratio of about 1.8 is ∼20% higher (lower) than reported values for bulk Si. For SiNWs with smaller core-to-shell ratios, a plastic deformation of the shell was observed together with a strain relaxation. A significant increase in the full width at half-maximum of the Raman LTO-peak due to phonon decay was used to determine the critical pressure at which LTO-phonons decay into LO + TA phonons. Our results reveal that this critical pressure in strained core-shell SiNWs (∼4 GPa) is different from the reported value for bulk Si (∼7 GPa), whereas no change is observed for relaxed core-shell SiNWs. © 2013 American Chemical Society.

Item Type: Article
Depositing User: Cron job
Date Deposited: 04 Feb 2015 22:39
Last Modified: 26 Feb 2015 01:21
DOI: 10.1021/jp309842c