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Transformation and Evaporation of Surface Adsorbents on a Graphene "Hot Plate"

Title
Transformation and Evaporation of Surface Adsorbents on a Graphene "Hot Plate"
Authors
Choi, Jun HeeShin, Dong HoonInani, HeenaKwon, Min HeeMustonen, KimmoMangler, ClemensPark, MinJeong, HyunjeongLee, Dong SuKotakoski, JaniLee, Sang Wook
Ewha Authors
이상욱
SCOPUS Author ID
이상욱scopus
Issue Date
2020
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link

1944-8252JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 12, no. 23, pp. 26313 - 26319
Keywords
scanning transmission electron microscopyin situ measurementsgrapheneJoule heatingdynamics
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
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.
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DOI
10.1021/acsami.0c02056
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자연과학대학 > 물리학전공 > Journal papers
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