Applied Microscopy

  • Volume 52
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  • Pages.7.1-7.6
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  • 2022
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  • 2287-5123(pISSN)
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  • 2287-4445(eISSN)
Korean Society of Microscopy (한국현미경학회)
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In-situ formation of co particles encapsulated by graphene layers

  • Minjeong Lee (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Gyutae Kim (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Gyu Hyun Jeong (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Aram Yoon (Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Zonghoon Lee (Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Gyeong Hee Ryu (School of Materials Science and Engineering, Gyeongsang National University)
  • Received : 2022.05.18
  • Accepted : 2022.07.05
  • Published : 2022.12.31
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Abstract

The process of encapsulating cobalt nanoparticles using a graphene layer is mainly direct pyrolysis. The encapsulation structure of hybrids prepared in this way improves the catalyst stability, which greatly reduces the leaching of non-metals and prevents metal nanoparticles from growing beyond a certain size. In this study, cobalt particles surrounded by graphene layers were formed by increasing the temperature in a transmission electron microscope, and they were analyzed using scanning transmission electron microscopy (STEM). Synthesized cobalt hydroxide nanosheets were used to obtain cobalt particles using an in-situ heating holder inside a TEM column. The cobalt nanoparticles are surrounded by layers of graphene, and the number of layers increases as the temperature increases. The interlayer spacing of the graphene layers was also investigated using atomic imaging. The success achieved in the encapsulation of metallic nanoparticles in graphene layers paves the way for the design of highly active and reusable heterogeneous catalysts for more challenging molecules.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1G1A1099542) and Institute for Basic Science (IBS-R019-D1). This result was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE). (2021RIS-003).

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