Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5279-5283Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01603
Keywords
Young's modulus; size effect; in situ deformation; transmission electron microscopy
Categories
Funding
- Australian Research Council
- Faculty of Engineering & Information Technologies, The University of Sydney, under the Faculty Research Cluster Program
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Determination of the elastic modulus of nano-structures 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.
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