Two-dimensional superlattice-like sheets of superparamagnetic graphene oxide/magnetic nanoparticle hybrids

Using a simple and facile method, we precisely controlled the two-dimensional layered array structure of graphene oxide (GO)–iron oxide (Fe 3 O 4 ) nanoparticle hybrid multilayer films and investigated the correlation between the assembled structure of the hybrid films and their magnetic properties....

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Veröffentlicht in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2020-07, Vol.22 (7), Article 203
Hauptverfasser: Jeong, Hee-Sung, You, Chun-Yeol, Suh, Byoung Jin, Kim, Kyung-Pil, Jang, Jiwon, Jeong, Seungyeop, Choi, Jae-Hak, Koo, Jaseung
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Sprache:eng
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Zusammenfassung:Using a simple and facile method, we precisely controlled the two-dimensional layered array structure of graphene oxide (GO)–iron oxide (Fe 3 O 4 ) nanoparticle hybrid multilayer films and investigated the correlation between the assembled structure of the hybrid films and their magnetic properties. GO–Fe 3 O 4 nanoparticle hybrids were obtained via the ligand exchange of oleic acid-functionalized Fe 3 O 4 nanoparticles with GO at the gas–liquid interface. Hybrids of oriented Fe 3 O 4 nanoparticles and GO monolayers spontaneously formed at the gas–liquid interface, which were subsequently deposited on solid substrates using the Langmuir–Schaefer (LS) technique. Two-dimensional superlattices of GO–Fe 3 O 4 nanoparticle hybrids were fabricated through repeated LS deposition of the nanoparticle monolayer with a hexagonal array structure sandwiched between GO monolayers. The magnetic properties of the GO–Fe 3 O 4 multilayer were measured using SQUID magnetometry. From the field cooling/zero field cooling results, we found that the 2D superlattice-like layered structure of the GO–Fe 3 O 4 multilayer facilitates the layer-dependent properties in the out-of-plane field case due to the dipolar interactions between the top and bottom layers.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-020-04910-x