Nano Archive

Mechanical and thermal properties of metallic and semiconductive nanostructures

Guisbiers, G and Kazan, M and Van Overscheide, O and Wautelet, M and Pereira, S (2008) Mechanical and thermal properties of metallic and semiconductive nanostructures. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (11). pp. 4097-4103.

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Official URL: http://dx.doi.org/10.1021/jp077371n

Abstract

Using a top-down approach, we report a theoretical investigation of the melting temperature at the nanoscale, T-m for different shapes of ``free-standing'' nanostructures. To easily calculate the nanoscale melting temperature for a wide range of metals and semiconductors, a convenient shape parameter called alpha(shape) is defined. Considering this parameter, we argue why smaller size effects are observed in high bulk melting temperature materials. Using T-m, a phase transition stress model is proposed to evaluate the intrinsic strain and stress during the first steps of solidification. Then, the size effect on the Thornton & Hoffman's criterion at the nanoscale is discussed and the intrinsic residual stress determination in nanostructures is found to be essential for sizes below 100 nm. Furthermore, the inverse Hall-Petch effect, for sizes below similar to 15 nm, can be understood by this model. Finally, the residual strain in hexagonal zinc oxide nanowires is calculated as a function of the wire dimensions.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
ID Code:2331
Deposited By:Anuj Seth
Deposited On:18 Dec 2008 12:42
Last Modified:26 Mar 2009 16:56

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