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SUMMARY:Atomically-Thin 2D Materials: a Versatile Platform for Nanofluidic
 s and Nanophotonics
DTSTART:20200306T121500
DTEND:20200306T131500
DTSTAMP:20260407T020658Z
UID:dc8a955294219b797fc8f2db1e5955e4d67c23d9043aa6df9ef45095
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Aleksandra Radenovic\, Institute of Bioengineering\, Sch
 ool of Engineering\, EPFL\, Lausanne (CH)\nBIOENGINEERING SEMINAR\n\nAbstr
 act:\nThe advent of atomically-thin 2D materials such as graphene\, hexago
 nal boron nitride (hBN) and molybdenum disulphide (MoS2)\, to name a few\,
  has enabled investigation of physical processes at ultimate scales. In my
  laboratory\, using atomically-thin 2D materials we explore two research a
 venues at the nanoscale: nanofluidics and nanophotonics.\n\nIn the first p
 art of my talk\, I will introduce nanopores formed in a monolayer of MoS2 
 and highlight recent experimental and theoretical developments that propel
 led the development of nanoscale devices allowing low-cost single-molecule
  analysis and osmotic energy harvesting. Both applications take advantage 
 of quasi-2D nature of MoS2 membrane. Even for the very small pore sizes\, 
 relatively high ionic currents are obtained due to the fact that the ionic
  current through a nanopore is inversely proportional to the thickness of 
 the membrane. Advances in the large area growth of the MoS2 opened the doo
 r for the applications that go beyond single pore experiments while the us
 e of light further boosted their impressive performance at water–energy 
 nexus.\nIn the second part of the talk\, I will introduce nanophotonics ap
 plications focusing on the atomic defects in hBN that room-temperature sin
 gle-photon emitters. The advent of single quantum emitters in 2D materials
  offers new opportunities to construct a scalable quantum architecture. Tr
 ansmission electron microscopy TEM\, SPM or confocal microscopy techniques
  are not ideal for fast\, high-throughput\, in-situ imaging of defects in 
 2D materials with nanometer resolution. There is a clear demand for the de
 velopment of advanced optical technology that images individual defects at
  better temporal\, spectral and spatial resolutions. We have explored the 
 single-molecule localization microscopy to characterize defects in hBN.  
 In addition to the precise location of the optically active defects we rec
 ord as well their spectral properties using spectral SMLM. As localization
  microscopy allows imaging in a liquid environment\, we were also able to 
 resolve for the first time the transport of single proton charges at the s
 urface of hexagonal boron nitride crystals immersed in water. Our approach
  relies on the successive activation of optically-active surface defects t
 hrough protonation events\, permitting us to make direct optical visualiza
 tion of the trajectories of individual charges at the surface of the cryst
 al\, with nanometric resolution and over micrometer range. This technique 
 reveals proton trajectories as a succession of jumps between proton-bindin
 g defects\, mediated by interfacial water. Our experiments thus demonstrat
 e the potential of super-resolution techniques for the investigation of ma
 terial science\, chemistry and soft matter at the molecular scale\, openin
 g up on a number of avenues related to the interplay of flow or confinemen
 t on molecular charge transport at interfaces.\n\nBio:\nProf. Aleksandra R
 adenovic is an associate professor at EPFL\, School of Engineering (STI)\,
  in the Institute of Bioenginnering where she started leading the Laborato
 ry of Nanoscale Biology (LBEN) in 2008. Her lab works in the research fiel
 d that can be termed single molecule biophysics. . She received her Ph.D. 
 in Biophysics from University of Lausanne (Switzerland.) in 2003 and a Msc
 . in Physics from University of Zagreb (Croatia) in 2000. She has received
  an European Research Council (ERC) Starting Grant in 2010\, and SNF Backu
 p scheme Consolidator Grant (2015). She is also recipient of CCMX material
 s challenge aword in 2015. She develops techniques and methodologies based
  on optical imaging\, bio-sensing and single-molecule manipulation with th
 e aim to monitor the behavior of individual biological molecules and compl
 exes in vitro and in live cells.\n\nZoom link for attending remotely: htt
 ps://epfl.zoom.us/j/286789148\n\n 
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202
STATUS:CONFIRMED
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