Open Access Nano Express

Mechanical Properties of Silicon Nanowires

Young-Soo Sohn1, Jinsung Park2, Gwonchan Yoon2, Jiseok Song2, Sang-Won Jee3, Jung-Ho Lee3, Sungsoo Na2, Taeyun Kwon4* and Kilho Eom2*

Author affiliations

1 Department of Biomedical Engineering, Catholic University of Daegu, Gyeongbuk, 712-702, Republic of Korea

2 Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea

3 Department of Chemical Engineering, Hanyang University, Gyeonggi-do, 426-791, Republic of Korea

4 Department of Biomedical Engineering, Yonsei University, Kangwon-do, 220-740, Republic of Korea

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Citation and License

Nanoscale Research Letters 2009, 5:211-216  doi:10.1007/s11671-009-9467-7

Published: 27 October 2009

Abstract

Nanowires have been taken much attention as a nanoscale building block, which can perform the excellent mechanical function as an electromechanical device. Here, we have performed atomic force microscope (AFM)-based nanoindentation experiments of silicon nanowires in order to investigate the mechanical properties of silicon nanowires. It is shown that stiffness of nanowires is well described by Hertz theory and that elastic modulus of silicon nanowires with various diameters from ~100 to ~600 nm is close to that of bulk silicon. This implies that the elastic modulus of silicon nanowires is independent of their diameters if the diameter is larger than 100 nm. This supports that finite size effect (due to surface effect) does not play a role on elastic behavior of silicon nanowires with diameter of >100 nm.

Keywords:
Silicon nanowire; Elastic modulus; Nanoindentation; Atomic force microscope