Variation of thermal expansion coefficient of freestanding multilayer pristine graphene with temperature and number of layers
| Autor: | Sang-Min Kim, Alexander E. Mag-isa, Jae-Hyun Kim, Chung-Seog Oh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Microscope Graphene 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Monolayer graphene Exfoliation joint Thermal expansion 0104 chemical sciences law.invention Mechanics of Materials law Thermal Materials Chemistry General Materials Science Graphite Composite material 0210 nano-technology |
| Zdroj: | Materials Today Communications. 25:101387 |
| ISSN: | 2352-4928 |
| Popis: | The in-plane coefficient of thermal expansion (CTE) of freestanding multilayer pristine graphene was directly measured by the thermal bulge method using a white light interferometric microscope. Graphene ribbons with 3, 5, and 10 layers were prepared by exfoliation of high-quality graphite flakes and then transferred over 60–120 μm wide trenches in a Si substrate. A novel transfer procedure was developed to achieve the freestanding configuration. All the measured CTE values were negative in the temperature range of 25–150 °C, and their absolute values decreased with increasing temperature and number of layers. The CTE of monolayer graphene can be approximated to about −7 × 10−6/°C. It was speculated that a structure with more than 12 layers was graphite rather than graphene. |
| Databáze: | OpenAIRE |
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