Anomalous coiling of SiGe/Si and SiGe/Si/Cr helical nanobelts
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 50430
Author(s) Zhang, Li; Ruh, Elisabeth; Gruetzmacher, Detlev; Dong, Lixin; Bell, Dominik J.; Nelson, Bradley J.; Schoenenberger, Christian
Author(s) at UniBasel Schönenberger, Christian
Year 2006
Title Anomalous coiling of SiGe/Si and SiGe/Si/Cr helical nanobelts
Journal Nano Letters
Volume 6
Number 7
Pages / Article-Number 1311-7
Abstract 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.
Publisher American Chemical Society
ISSN/ISBN 1530-6984 ; 1530-6992
Full Text on edoc No
Digital Object Identifier DOI 10.1021/nl052340u
PubMed ID
ISI-Number 000238973100002
Document type (ISI) Journal Article

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