Determination of Youngs Modulus of Ultrathin Nanomaterials

Chen, Yujie, Gao, Qiang, Wang, Yanbo, An, Xianghai, Liao, Xiaozhou, Mai, Yiu-Wing, Tan, H.Hoe, Zou, Jin, Ringer, Simon P and Jagadish, Chennupati (2015) Determination of Youngs Modulus of Ultrathin Nanomaterials. Nano Letters, 15 8: 5279-5283. doi:10.1021/acs.nanolett.5b01603

Author Chen, Yujie
Gao, Qiang
Wang, Yanbo
An, Xianghai
Liao, Xiaozhou
Mai, Yiu-Wing
Tan, H.Hoe
Zou, Jin
Ringer, Simon P
Jagadish, Chennupati
Title Determination of Youngs Modulus of Ultrathin Nanomaterials
Journal name Nano Letters   Check publisher's open access policy
ISSN 1530-6992
Publication date 2015-07-19
Year available 2015
Sub-type Article (original research)
DOI 10.1021/acs.nanolett.5b01603
Open Access Status Not Open Access
Volume 15
Issue 8
Start page 5279
End page 5283
Total pages 5
Place of publication Washington, United States
Publisher American Chemical Society
Collection year 2016
Language eng
Formatted abstract
Determination of the elastic modulus of nanostructures with sizes at several nm range is a challenge. In this study, we designed an experiment to measure the elastic modulus of amorphous Al2O3 films with thicknesses varying between 2 and 25 nm. The amorphous Al2O3 was in the form of a shell, wrapped around GaAs nanowires, thereby forming an effective core/shell structure. The GaAs core comprised a single crystal structure with a diameter of 100 nm. Combined in situ compression transmission electron microscopy and finite element analysis were used to evaluate the elastic modulus of the overall core/shell nanowires. A core/shell model was applied to deconvolute the elastic modulus of the Al2O3 shell from the core. The results indicate that the elastic modulus of amorphous Al2O3 increases significantly when the thickness of the layer is smaller than 5 nm. This novel nanoscale material can be attributed to the reconstruction of the bonding at the surface of the material, coupled with the increase of the surface-to-volume ratio with nanoscale dimensions. Moreover, the experimental technique and analysis methods presented in this study may be extended to measure the elastic modulus of other materials with dimensions of just several nanometers.
Keyword Youngs modulus
size effect
in situ deformation
transmission electron microscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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