Nano Archive

Anomalous coiling of SiGe/Si and SiGe/Si/Cr helical nanobelts

Zhang, Li and Ruh, Elisabeth and Gruetzmacher, Detlev and Dong, Lixin and Bell, Dominik J. and Nelson, Bradley J. and Schoenenberger, Christian (2006) Anomalous coiling of SiGe/Si and SiGe/Si/Cr helical nanobelts. NANO LETTERS, 6 (7). pp. 1311-1317.

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The fabrication of nanohelices by the scrolling of strained bilayers is investigated. It is shown that structure design is dominated by edge effects rather than bulk crystal properties such as the Young's modulus when the dimensions of the structures are reduced below 400 nm. SiGe/Si/Cr, SiGe/Si, and Si/Cr helical nanobelts are used as test structures. Dimensions of the belt width are reduced from 1.30 mu m to 300 nm, and parameters controlling helicity angle, chirality, diameter, and pitch of the nanohelices are investigated. An anomalous scrolling direction deviating from the preferred < 100 > scrolling direction has been found for small structures. Making use of the anomalous scrolling, it is possible to fabricate three-dimensional helices with helicity angles less than 45 degrees, which is advantageous for micro- and nanoelectromechanical systems.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Functional and hybrid materials
Physical Science > Nano objects
ID Code:3732
Deposited By:Farnush Anwar
Deposited On:22 Jan 2009 13:05
Last Modified:29 Jan 2009 12:19

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