Transformation and Evaporation of Surface Adsorbents on a Graphene 'Hot Plate'
| Autor: | Sangwook Lee, Dong Hoon Shin, Kimmo Mustonen, Dong Su Lee, Junhee Choi, Jani Kotakoski, Clemens Mangler, Min Park, Min Hee Kwon, Hyunjeong Jeong, Heena Inani |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
In situ Materials science Graphene graphene Evaporation Joule heating in situ measurements dynamics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Adsorption Chemical engineering law 0103 physical sciences Scanning transmission electron microscopy scanning transmission electron microscopy Surface modification General Materials Science Hot plate 0210 nano-technology Research Article |
| Zdroj: | ACS Applied Materials & Interfaces |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c02056 |
| Popis: | Dynamic surface modification of suspended graphene at high temperatures was directly observed with in situ scanning transmission electron microscopy (STEM) measurements. The suspended graphene devices were prepared on a SiN membrane substrate with a hole so that STEM observations could be conducted during Joule heating. Current-voltage characteristics of suspended graphene devices inside the STEM chamber were measured while monitoring and controlling the temperature of graphene by estimating the electrical power of the devices. During the in situ STEM observation at high temperatures, residual hydrocarbon adsorbents that had remained on graphene effectively evaporated creating large, atomically clean graphene areas. At other places, dynamic changes in the shape, position, and orientation of adsorbents could be directly observed. The temperature of the suspended graphene sample was estimated to reach up to 2000 K during the experiment, making graphene an efficient high-temperature micrometer-sized electron-transparent hot plate for future experiments in microscopes. |
| Databáze: | OpenAIRE |
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