Chemistry and Materials Science Talk

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Among various types of Fe-phases, y-Fe (antiferromagnetic/ferromagnetic, face-centered-cubic, FCC) has recently attracted significant attention when stabilized inside carbon nanotubes (CNTs), especially for applications in spintronics, exchange-bias-devices and nanomedicine. In this talk, I will present some of the recent results obtained by employing in-situ nanofabrication- and manipulation-methods, based on the sublimation and pyrolysis of ferrocene, for the controlled stabilization of this phase. Selective stabilization of ferromagnetically-ordered nanocrystal-phases (Fe3C, a-Fe, y-Fe) is demonstrated by tuning the synthesis and cooling parameters. In these nanoscale systems, layered antiferromagnetism may result from the nucleation of crystalline junctions between ferromagnetic-phases, within nanowires. The dynamics of nano-junction nucleation are of importance towards the development of exchange-bias devices and will be discussed by referring to high resolution transmission electron microscopy (HRTEM) analyses. The presented results open new avenues towards the manipulation of the y-Fe phase into CNTs, offering perspective for tunable ferromagnetic to antiferromagnetic transformations through interstitial carbon migration.

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Dr Filippo Boi is currently an Associate Professor in the area of nanotechnology/nanofabrication at the department of Chemistry and Materials Science, School of Science, Xi¡¯an Jiaotong-Liverpool University. He has previously worked at the College of Physics, Sichuan University (SCU), as Associate and Full Professor, at the joint Institute between QMUL (Queen Mary University of London) and SCU, and as visiting lecturer at QMUL. Since my PhD in Physics at QMUL (2013), He has been focusing my research on nanofabrication, characterization, and manipulation of one-dimensional nanoscale-systems, especially Fe-filled carbon-nanotubes. To date, His research-work has resulted in 126 publications (111 papers as first and/or corresponding-author) in significant Physics, Materials and Chemistry journals, including Carbon (I.F. 11.6), Applied Materials Today (I.F. 6.9), Materials Today Chemistry (I.F. 6.7), Journal of Materials Chemistry C (I.F. 5.1), Diamond and Related Materials (I.F. 5.1) and others. He has been awarded with 3 National-level NSFC, 1 Provincial and 2 University-level fundings for a total of 1.65 million Yuan awarded-funds as project-leader (PI).