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Lee, Zonghoon
Atomic-Scale Electron Microscopy Lab.
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In-situ formation of co particles encapsulated by graphene layers

Author(s)
Lee, MinjeongKim, GyutaeJeong, Gyu HyunYoon, AramLee, ZonghoonRyu, Gyeong Hee
Issued Date
2022-12
DOI
10.1186/s42649-022-00076-z
URI
https://scholarworks.unist.ac.kr/handle/201301/60696
Citation
Applied Microscopy, v.52, no.1, pp.1 - 6
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.
Publisher
한국현미경학회
ISSN
2287-5123
Keyword (Author)
Co particleEncapsulationGrapheneCo (OH)2STEM

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