Choi, Jun Hee Shin, Dong Hoon Inani, Heena Kwon, Min Hee Mustonen, Kimmo Mangler, Clemens Park, Min Jeong, Hyunjeong Lee, Dong Su Kotakoski, Jani Lee, Sang Wook 2024-01-19T17:30:48Z 2024-01-19T17:30:48Z 2021-09-04 2020-06-10 1944-8244 https://pubs.kist.re.kr/handle/201004/118524 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. English American Chemical Society TRANSPORT Transformation and Evaporation of Surface Adsorbents on a Graphene "Hot Plate" Article 10.1021/acsami.0c02056 1 ACS Applied Materials & Interfaces, v.12, no.23, pp.26313 - 26319 ACS Applied Materials & Interfaces 12 23 26313 26319 scie scopus 000541679900083 2-s2.0-85086346127 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article TRANSPORT scanning transmission electron microscopy in situ measurements graphene Joule heating dynamics