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SUMMARY:Functional oxide aperiodic superlattices
DTSTART:20141128T110000
DTSTAMP:20260407T020650Z
UID:fe9588245a03b2e8cd06b591fc0a6371d3b7c8082d45571626549eb2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Velimir Radmilovic\, Nanotechnology and Functional Mater
 ials Center\, Faculty of Technology and Metallurgy\, University of Belgrad
 e\nFunctional oxide nanowires are expected to play an important role in sc
 avenging waste heat and converting it into electricity. Some complex super
 lattices in hetrostructures contain periodic compositional and structural 
 features\, typically on the nanometer scale\, making them promising materi
 als for thermoelectric applications.\nIn this presentation\, I will discus
 s our recently discovered a novel method to produce M2O3(ZnO)n aperiodic s
 uperlattice nanowires (M=In\, Ga\, Fe\,..) by solid state diffusion proces
 s. This is in agreement with the theoretical prediction that it is possibl
 e to increase the material-dependent figure of merit\, zT\, by using low d
 imensional materials\, attributed to electronic band structure changes and
  enhanced interface phonon scattering. Atomic resolution HAADF imaging is 
 used to perform a detailed structural analysis on the M2O3(ZnO)n nanowires
 \, unambiguously determined the location of indium within the structure an
 d to evaluate lattice strain and the presence of defects. Based on this an
 alysis we propose that the superlattice structure is generated through a d
 efect-assisted process.\nOne of the greatest advantages of this novel synt
 hesis is the ability to tune the nanoscale features of the polytypoid wire
 s by simply adjusting the amount of metal precursor. We also performed a q
 uantitative analysis of the change in superlattice inclusion density and p
 eriodicity with metal deposition. Compare to ZnO nanowires\, these new oxi
 de thermoelectric nanostructures exhibited almost three orders of magnitud
 e increase in efficiency. This will enable future studies on structure-dep
 endent thermoelectric properties and possibly lead to further enhancements
  in thermoelectric efficiency.\nBio: Velimir Radmilovic was born in 1948 i
 n Herceg Novi\, Montenegro. He graduated from the Faculty of Technology an
 d Metallurgy (TMF)\, University of Belgrade\, in 1972. He got his MSc (198
 1) and PhD (1985) degree in Physical Metallurgy\, TMF\, University of Belg
 rade. Dr. Radmilovic got a position of an assistant professor in Physical 
 Metallurgy from the TMF in Belgrade in 1985\, associate professor in 1991\
 , and full professor in 1995. He has been teaching numerous undergraduate 
 and graduate courses related to materials science and physical metallurgy 
 such as: physical metallurgy\, phase transformations\, crystallography and
  crystal defects\, X-ray diffraction\, electron microscopy\, mechanical me
 tallurgy\, and heat treatment. He is the author or coauthor of 143 scienti
 fic papers published in peer review journals in the field of physical meta
 llurgy\, materials science\, nanoscience and nanotechnology and 222 papers
  published in conference proceedings and presented at national and interna
 tional conferences. His results were cited in the scientific literature mo
 re than 1000 times. As a visiting professor and a research fellow he worke
 d at the Department of Materials Science\, University of California at Ber
 keley\, University of Pittsburgh\, Pennsylvania\, and National Center for 
 Electron Microscopy\, Lawrence Berkeley National Laboratory\, where he is 
 currently principal investigator. He has been serving as a reviewer to num
 erous peer review journals such as Metallurgical and Materials Transaction
 \, Materials Science and Engineering\, Science\, Nanotechnology\, Acta Mat
 erialia\, Scripta Materialia\, Diamond and Related Materials\, Journal of 
 Materials Science\, Journal of Serbian Chemical Society
LOCATION:PH L1 503 (Aquarium) http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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