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Paramagnetic Carbon Nanosheets with Random Hole Defects and Oxygenated Functional Groups
Author(s) -
Jung SunMin,
Park Jungmin,
Shin Dongbin,
Jeong Hu Young,
Lee DongKyu,
Jeon InYup,
Cho HyungJoon,
Park Noejung,
Yoo JungWoo,
Baek JongBeom
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201903226
Subject(s) - paramagnetism , spins , density functional theory , carbon fibers , chemistry , monomer , functional group , magnetic moment , materials science , photochemistry , crystallography , computational chemistry , chemical physics , condensed matter physics , organic chemistry , physics , polymer , composite number , composite material
Ordered graphitic carbon nanosheets (GCNs) were, for the first time, synthesized by the direct condensation of multifunctional phenylacetyl building blocks (monomers) in the presence of phosphorous pentoxide. The GCNs had highly ordered structures with random hole defects and oxygenated functional groups, showing paramagnetism. The results of combined structural and magnetic analyses indicate that the hole defects and functional groups are associated with the appearance and stabilization of unpaired spins. DFT calculations further suggest that the emergence of stabilized spin moments near the edge groups necessitates the presence of functionalized carbon atoms around the hole defects. That is, both hole defects and oxygenated functional groups are essential ingredients for the generation and stabilization of spins in GCNs.