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Magnetism Of Zno Nanoparticles: Dependence On Crystallite Size And Surfactant Coating, Aaron Thurber, Geoffrey Beausoleil, Gordon Alanko, Joshua Anghel, Michael Jones, Lydia Johnson, Jianhui Zhang, Charles Hanna, Dmitri Tenne, Alex Punnoose
Magnetism Of Zno Nanoparticles: Dependence On Crystallite Size And Surfactant Coating, Aaron Thurber, Geoffrey Beausoleil, Gordon Alanko, Joshua Anghel, Michael Jones, Lydia Johnson, Jianhui Zhang, Charles Hanna, Dmitri Tenne, Alex Punnoose
Lydia Johnson
Many recent reports on magnetism in otherwise nonmagnetic oxides have demonstrated that nanoparticle size, surfactant coating, or doping with magnetic ions produces room-temperature ferromagnetism. Specifically, ZnO has been argued to be a room-temperature ferromagnet through all three of these methods in various experimental studies. For this reason, we have prepared a series of 1% Fe doped ZnO nanoparticle samples using a single forced hydrolysis co-precipitation synthesis method from the same precursors, while varying size (6 – 15 nm) and surface coating concentration to study the combined effects of these two parameters. Size was controlled by modifying the water concentration. Surfactant …
Transition Metal Dopants Essential For Producing Ferromagnetism In Metal Oxide Nanoparticles, Lydia M. Johnson, Aaron Thurber, Joshua Anghel, Maryam Sabetian, Mark H. Engelhard, Dmitri A. Tenne, Charles B. Hanna, Alex Punnoose
Transition Metal Dopants Essential For Producing Ferromagnetism In Metal Oxide Nanoparticles, Lydia M. Johnson, Aaron Thurber, Joshua Anghel, Maryam Sabetian, Mark H. Engelhard, Dmitri A. Tenne, Charles B. Hanna, Alex Punnoose
Lydia Johnson
Recent claims that ferromagnetism can be produced in nanoparticles of metal oxides without the presence of transition metal dopants have been challenged in this work by investigating 62 high quality well-characterized nanoparticle samples of both undoped and Fe doped (0-10% Fe) ZnO. The undoped ZnO nanoparticles showed zero or negligible magnetization, without any dependence on the nanoparticle size. However, chemically synthesized Zn1-xFexO nanoparticles showed clear ferromagnetism, varying systematically with Fe concentration. Furthermore, the magnetic properties of Zn1-xFexO nanoparticles showed strong dependence on the reaction media used to prepare the samples. The zeta potentials of the Zn1-xFexO nanoparticles prepared using different …