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SUMMARY:IMX Seminar Series - Optical Materials
DTSTART:20221121T131500
DTEND:20221121T141500
DTSTAMP:20260408T000020Z
UID:1ffb89b89cd7f9e515973a6ecb9ccdef8c0a69ffc9afe940e79d7ac0
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. David Norris\, ETH Zürich\, Switzerland\nThe Dream of t
 he Perfect Nanocrystal\nQuantum dots are nanometer-sized crystallites of s
 emiconductor that have a roughly spherical shape. Due to extensive researc
 h\, quantum dots are now commercially used as a robust fluorescent materia
 l in displays and lighting. However\, even with our best procedures\, stat
 e-of-the-art samples still contain particles with a distribution in size a
 nd shape. Because this causes variations in their optical properties\, the
 ir performance for applications is reduced. This leads to a fundamental qu
 estion: can we achieve a sample of semiconductor nanocrystals in which all
  the particles are exactly the same? In this talk we will discuss this pos
 sibility by examining two classes of nanomaterials. First\, we will consid
 er thin rectangular particles known as semiconductor nanoplatelets. Amazin
 gly\, nanoplatelet samples can be synthesized in which all crystallites ha
 ve the same atomic-scale thickness (e.g.\, 4 monolayers). This uniformity 
 in one dimension suggests that routes to monodisperse samples might exist.
  After describing the underlying growth mechanism for nanoplatelets\, we w
 ill then move to a much older nanomaterial—magic-sized clusters (MSCs). 
 Such species are believed to be molecular-scale arrangements (i.e.\, clust
 ers) of semiconductor atoms with a specific (“magic”) structure with e
 nhanced stability compared to particles slightly smaller or larger. Their 
 existence implies that MSC samples can in principle be the same size and s
 hape. Unfortunately\, despite three decades of research\, the formation me
 chanism of MSCs remains unclear\, especially considering recent experiment
 s that track the evolution of MSCs to sizes well beyond the “cluster” 
 regime. Again\, we will discuss the underlying growth mechanism and its im
 plications for nanocrystal synthesis. Finally\, we will present an outlook
  if perfect nanomaterials can be obtained.\nBio: David J. Norris received 
 his B.S. and Ph.D. degrees in Chemistry from the University of Chicago (19
 90) and Massachusetts Institute of Technology (1995)\, respectively. After
  an NSF postdoctoral fellowship with W. E. Moerner at the University of Ca
 lifornia\, San Diego\, he led a small independent research group at the NE
 C Research Institute in Princeton (1997). He then became an Associate Prof
 essor (2001–2006) and Professor (2006–2010) of Chemical Engineering an
 d Materials Science at the University of Minnesota\, where he also served 
 as Director of Graduate Studies in Chemical Engineering (2004–2010). In 
 2010\, he moved to ETH Zurich where he is currently Professor of Materials
  Engineering. From 2016 to 2019 he served as the Head of the Department of
  Mechanical and Process Engineering. He has received the Credit Suisse Awa
 rd for Best Teacher at ETH\, twice the Golden Owl Award for Best Teacher i
 n his department\, the Max Rössler Research Prize\, an ERC Advanced Grant
 \, and the ACS Nano Lectureship Award. He is a Fellow of the American Phys
 ical Society and the American Association for the Advancement of Science\,
  and an editorial board member for ACS Photonics and Nano Letters. His res
 earch focuses on how materials can be engineered to create new and useful 
 optical properties.\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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