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SUMMARY:High-Pressure Synthesis: from Semiconductor Optical Fibers to Carb
 on Nanothreads
DTSTART:20180430T131500
DTEND:20180430T141500
DTSTAMP:20260407T003802Z
UID:6a4959c28a56885b83d82764d749aba8bd84c4890446b36ca2b14c74
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. John V. Badding\, Penn State University USA\nPressure is
  a thermodynamic variable that is as fundamental as temperature but is arg
 uably underutilized in materials chemistry research. It can\, for example\
 , control interatomic distance\, tune chemical reaction kinetics and therm
 odynamics\, allow for solvents with hybrid liquid-like and gas-like proper
 ties\, and infiltrate molecules and materials into near atomic scale voids
 . Our group has used pressure to synthesize semiconductor optical fibers t
 hat integrate electronic and photonic functions.1  The fibers themselves 
 are treated as miniature chemical reactors\, enabling practical high-press
 ure deposition that would otherwise be difficult or impossible.   Using 
 this approach\, we have demonstrated single crystal\, small core silicon a
 nd germanium fibers with useful nonlinear properties\, in-fiber GHz bandwi
 dth photodiodes\, and tunable chromium-doped zinc selenide fiber lasers. W
 e have extended the deposition approaches developed for fibers to semicond
 uctor and metal “metalattice” nanomaterials that offer the possibility
  of tuning properties by quantum confinement while allowing for long-range
  transport of electrons and phonons in all three dimensions.2  Finally\, 
 we have synthesized carbon and carbon nitride nanothreads under pressure f
 rom benzene and pyridine molecules\, respectively.  These  one-dimension
 al and sp3-bonded “flexible diamond” nanostructures are the last remai
 ning entry in the matrix of carbon nanomaterial dimensionality (0D/1D/2D/3
 D) and bonding hybridization (trigonal sp2/tetrahedral  sp3).3  The exam
 ples set by carbon and carbon nitride nanothreads suggest that practical p
 ressure synthesis from small molecules of a large family of extended carbo
 n materials with a diversity of useful\, tunable properties may be possibl
 e.\n\n(1) Sparks\, J. R.\; Sazio\, P. J. A.\; Gopalan\, V.\; Badding\, J. 
 V. Annu. Rev. Mater. Res. 2013\, 43\, 527-557.\n\n(2) Liu\, Y. Z.\; Kempin
 ger\, S.\; He\, R. R.\; Day\, T. D.\; Moradifar\, P.\; Yu\, S. Y.\; Russel
 l\, J. L.\; Torres\, V. M.\; Xu\, P. T.\; Mallouk\, T. E.\; Mohney\, S. E.
 \; Alem\, N.\; Samarth\, N.\; Badding\, J. V. Nano Lett. 2018\, 18\, 546-5
 52.\n\n(3) Fitzgibbons\, T. C.\; Guthrie\, M.\; Xu\, E. S.\; Crespi\, V. H
 .\; Davidowski\, S. K.\; Cody\, G. D.\; Alem\, N.\; Badding\, J. V. Nat. M
 ater. 2015\, 14\, 43–47.\n\nBio: John V. Badding is Professor of Chemist
 ry\, Physics\, and Materials Science and Engineering at Pennsylvania State
  University\, USA.  After receiving a Ph. D in the Department of Chemistr
 y at U.C. Berkeley in 1989\, he did post-doctoral work with R.J. Hemley an
 d H.K. Mao at the Carnegie Institution of Washington and then moved to Pen
 n State.  He is the recipient of a David and Lucile Packard Foundation Fe
 llowship\, an NSF National Young Investigator Award\, and the 2015 Faculty
  Scholar Medal at Penn State.  He is the author of over 200 publications 
 in the general area of materials science and chemistry.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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