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Size Effects on the Mechanical Properties of Nanoporous Graphene Networks
- Source :
- Advanced Functional Materials. 29:1900311
- Publication Year :
- 2019
- Publisher :
- Wiley, 2019.
-
Abstract
- It is essential to understand the size scaling effects on the mechanical properties of graphene networks to realize the potential mechanical applications of graphene assemblies. Here, a “highly dense-yet-nanoporous graphene monolith (HPGM)” is used as a model material of graphene networks to investigate the dependence of mechanical properties on the intrinsic interplanar interactions and the extrinsic specimen size effects. The interactions between graphene sheets could be enhanced by heat treatment and the plastic HPGM is transformed into a highly elastic network. A strong size effect is revealed by in situ compression of micro- and nanopillars inside electron microscopes. Both the modulus and strength are drastically increased as the specimen size reduces to ≈100 nm, because of the reduced weak links in a small volume. Molecular dynamics simulations reveal the deformation mechanism involving slip-stick sliding, bending, buckling of graphene sheets, collapsing, and densification of graphene cells. In addition, a size-dependent brittle-to-ductile transition of the HPGM nanopillars is discovered and understood by the competition between volumetric deformation energy and critical dilation energy.
- Subjects :
- Materials science
Graphene
Nanoporous
02 engineering and technology
Bending
Nanoindentation
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Electronic, Optical and Magnetic Materials
law.invention
Biomaterials
Molecular dynamics
Deformation mechanism
law
Electrochemistry
Deformation (engineering)
Composite material
0210 nano-technology
Nanopillar
Subjects
Details
- ISSN :
- 16163028 and 1616301X
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Advanced Functional Materials
- Accession number :
- edsair.doi...........e128ef63cb4aafc2ba53beab3187b8d0