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DESCRIPTION:Speaker: Dr. Rainer T. Lechner\nhosted by Maria Ibáñez\nAbstr
 act: The chemical synthesis of colloidal nanocrystals (NCs) is a well-esta
 blished method providing highly monodisperse quantum dots [1] for applicat
 ions such as e.g.\, fluorophores or magnetic nanoparticles [1\,2]. The mor
 phology of NCs has a substantial influence on their highly diverse physica
 l properties. Controlling the morphology of NCs during the synthesis and t
 he ability to analyse this morphology of a significant number of particles
  is one key research interest in this field. Besides the more common trans
 mission electron microscope (TEM)\, small angle X-ray scattering (SAXS) at
  lab and synchrotron sources is a leading technique for analysing the morp
 hology of colloidal nanocrystals with sub-nanometre resolution. The combin
 ation with diffraction techniques (XRD/WAXS) yields additionally the NCs
 ’ crystalline properties.The material combinations ranges from  CdSe/Cd
 S core/shell NCs [3] over environmentally benign InP/ZnO/ZnS core/shell/sh
 ell NCs [4] to magnetic FeO NCs [2]\, where we could follow their shape tr
 ansition from nanostars to nanocubes [5].The NC’s shape can also signifi
 cantly influence the super-crystal structure of colloidal supercrystals SC
 s [1]\, where NCs act as building blocks to form 3D nanocrystal solids wit
 h designed properties [1\, 6]. We followed this supercrystal growth by in-
 situ SAXS studies combined with MC-simulations [6]. Very recently\, we use
 d also faceted semiconducting PbTe/PbS NCs (synthesised by the Ibanez-Lab)
  as building blocks for growing and characterising micrometre sized superc
 rystals.
LOCATION:Sunstone Building - Big Seminar Room A\, ISTA
ORGANIZER:
SUMMARY:Dr. Rainer T. Lechner: Colloidal Nanocrystals & Supercrystals inves
 tigated by combined X-ray Scattering Techniques
URL:https://talks-calendar.ista.ac.at/events/4132
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