The 10th Annual Riley O. Schaeffer: Assembly and Disassembly of Layered Materials

October 20, 2017

Dr. Tom Mallouk, Penn State

Photo: Seminar:


Thomas E. Mallouk is Evan Pugh Professor of Chemistry, Biochemistry and Molecular Biology, Physics, and Engineering Science and Mechanics at the Pennsylvania State University.  His research focuses on the synthesis of inorganic materials and their application to solar energy conversion, catalysis and electrocatalysis, nano- and microscale motors, low dimensional physical phenomena, and environmental remediation.  He is the author of over 400 publications, including a few good ones.  He is an Associate Editor of the Journal of the American Chemical Society and Associate Director of the Penn State MRSEC, the Center for Nanoscale Science


“Assembly and Disassembly of Layered Materials”

Layered solids – which have strong bonds in two dimensions and weaker links in the third - are interesting building blocks for materials and devices because they potentially offer control over structure at the molecular level. Our research in this area began with the question of whether such compounds could be built up one layer at a time in controlled sequences on surfaces. This was possible by using either molecular precursors, in the case of metal phosphonates, or exfoliated sheets derived from lamellar microcrystals. Many layered oxides consist of negatively charged sheets interleaved by exchangeable cations. These oxides are particularly amenable to exfoliation (and to other topochemical reactions) by simple ion-exchange and acid-base reactions. Recently we have found that van der Waals solids such as graphite, hexagonal BN, and MoS2 can also be intercalated and exfoliated without incurring damage to the sheets by means of acid-base and redox reactions.

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