[cid:image003.png@01D10822.5867E850]<https://engineering.purdue.edu/ChE> Purdue University School of Chemical Engineering GRADUATE SEMINAR SERIES Dr. Dmitri V. Talapin Department of Chemistry and James Franck Institute University Chicago "Nanocrystal Assemblies: a Modular Approach to Materials Design" Tuesday, October 20, 2015 3:00 - 4:15 p.m. FRNY G140 Reception at 2:30 p.m. in Henson Atrium Abstract: Development of synthetic methods for nanostructures has introduced new approaches for engineering functional materials. Nanocrystal assemblies provide a powerful platform for designing two- and three-dimensional solids with tailored electronic, magnetic, optical and catalytic properties. Unlike atomic and molecular crystals where atoms, lattice geometry, and interatomic distances are fixed entities, the arrays of nanocrystals represent solids made of "designer atoms" with potential for continuous tuning their physical and chemical properties. The assembly of functional materials from nanoscale building blocks combines advantages of crystalline inorganic semiconductors with inexpensive solution-based device fabrication. Along these lines, colloidal semiconductor quantum dots are explored as the functional elements in printable electronics, light emitting devices, photodetectors and solar cells. All the above applications rely on efficient charge transport in nanocrystal arrays. In the recent years significant progress has been achieved in development of chemical approaches to improve electronic transport and control doping in nanocrystal arrays. I will review these developments and discuss recent results on inorganic ligands for colloidal nanomaterials. By using optimized surface chemistries we prepared nanocrystal solids exhibiting carrier mobilities comparable to those in single crystal materials. I will demonstrate the power of "modular" materials fabrication for electronic, thermoelectric and photovoltaic devices. Bio: Dmitri Talapin is a Professor of Chemistry at University of Chicago. His research interests revolve around inorganic nanomaterials, spanning from synthetic methodology to device fabrication, with the desire of turning colloidal nanostructures into competitive materials for electronics and optoelectronics. He received his doctorate degree from University of Hamburg, Germany in 2002 under supervision of Horst Weller. In 2003 he joined IBM Research Division at T. J. Watson Research Center as a postdoctoral fellow to work with Chris Murray on synthesis and self-assembly of semiconductor nanostructures. In 2005 he moved to Lawrence Berkeley National Laboratory as a staff scientist at the Molecular Foundry and finally joined faculty at the University of Chicago in 2007. His recent recognitions include ACS Akron Section Award (2014); MRS Outstanding Young Investigator Award (2011); Camille Dreyfus Teacher Scholar Award (2010) and David and Lucile Packard Fellowship in Science and Engineering (2009).
