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URL:https://murmitoyen.com/events/vanille/udem/detail/678348-guestmof-achie
 ving-emergent-properties-for-electronic-and-energy-conversion-device-appli
 cations-n-alec-talin-sandia-national-laboratories
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Guest@MOF: Achieving Emergent Properties for Electronic and  Energy
  Conversion Device Applications – Alec Talin\, Sandia National Laborator
 ies
DESCRIPTION:Alec Talin\, Distinguished Member of the Technical Staff\, Ma
 terials Physics Department\, MS9161\, Sandia National Laboratories\, Ca
 lifornia\, P.O. Box 969\, Livermore\, CA 94551-0969\, USA.
\nMetal-organ
 ic frameworks (MOFs) are extended\, crystalline compounds consisting of me
 tal ions interconnected by organic ligands\, forming scaffolding-like stru
 ctures that are sometimes referred to as “molecular tinker toys”. MOFs
  have attracted considerable attention for traditional applications of mic
 roporous materials\, such as gas storage and separation. In many of these 
 cases\, however\, the interactions between the guest molecules (CO2\, H2\,
  etc.) and the framework are weak and do not constitute a chemical bond. I
 n my talk I will discuss a rather different concept of Guest@MOF\, one in 
 which the interaction between the framework and the guest goes beyond the 
 relatively weak physisorption and results in a new material with unique pr
 operties stemming from the strong MOF-guest interactions. The idea of Gues
 t@MOFs emerging as a new class of materials was stimulated by our discover
 y that infiltrating HKUST-1 pores with TCNQ (an insulator in its pure stat
 e) increases the electrical conductivity of the insulating MOF by over sev
 en orders of magnitude (from <10-8 S cm-1 to ~ 0.1 S cm-1) [1]. This emerg
 ent property results from a donor-bridge-acceptor geometry\, in which TCNQ
  binds to two Cu(II) dimer units within the MOF pore. I will describe the 
 synthesis\, chemical\, and electrical characterization of TCNQ@ HKUST-1\, 
 as well as first-principles electronic structure calculations that indicat
 e that conductivity occurs via a hopping mechanism facilitated by the brid
 ging TCNQ. I will also discuss recent thermoelectric measurements which su
 ggest that Guest@MOF materials may be useful in waste heat recovery applic
 ations [2].
\n
\nA. A. Talin\, A. Centrone\, A. Ford\, M. E. Foster\, V. S
 tavila\, P. Haney\, R. A. Kinney\, V. Szalai\, F. El Gabaly\, H. P. Yoon\,
  F. Léonard\, M. D. Allendorf\, “Tunable Electrical Conductivity in Met
 al-Organic Framework Thin Film Devices”\, Science 343\, 66 (2014).
\nK. 
 J. Erickson\, F. Léonard\, V. Stavila\, M. E. Foster\, C. D. Spataru\, R.
  E. Jones \, B. M. Foley\, P. E. Hopkins\, M. D. Allendorf\, and A. A. Tal
 in\, “Thin Film Thermoelectric Metal–Organic Framework with High Seebe
 ck Coefficient and Low Thermal Conductivity”\, Adv. Mat. 27\, 3453 (2015
 ).
\n
\nBIO:
\nSite web du groupe de Dr Talin
\nAlec Talin is a Distingui
 shed Member of Technical Staff at Sandia National Laboratories\, in Liverm
 ore\, CA\, an adjunct associate professor of Materials Science and Enginee
 ring at the University of Maryland\, College Park\, and a Principal Foundi
 ng Editor of MRS Communications. He received a B.A. in Chemistry from UC S
 an Diego in 1989 and a Ph.D. in Materials Science and Engineering from UC 
 Los Angeles in 1995. Prior to joining Sandia in 2002\, Dr. Talin spent six
  years as a research scientist and manager at the Motorola Corporate Labs 
 in Phoenix\, AZ\, and was a Project Leader at the Center for Nanoscale Sci
 ence and Technology at NIST from 2009 to 2012. Currently\, Dr. Talin leads
  a number of projects at Sandia in areas that include novel electronic mat
 erials\, energy storage and conversion\, and national security.
\nCette co
 nférence est présentée par le RQMP Versant Nord du Département de phy
 sique de l'Université de Montréal et le Département de génie physiqu
 e de Polytechnique Montréal.
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