ME Seminar: J. Nathan Hohman

Friday, October 4, 2019
11:00 AM - 12:00 PM
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Abstract: When reduced in size to the nanoscale, materials express compelling new phenomena. For example, a single layer abstracted from graphite leads to fantastic new properties in graphene, or a nanocrystal of gold takes on new optical properties as a nanoparticle. Making materials very small or very thin has been an easy way to prepare exciting new materials—for example, the 2D transition metal dichalcogenides (TMDCs) have a long history of investigation prior to the recent interest in their monolayers for applications in photovoltaics, electrocatalysts, and spintronic materials. 2D phases have been uncovered for a number of elements and binary semiconductors, although many compounds do not share the same propensity to form 2D structures. Through the use of hybrid materials like hybrid perovskites and metal organic chalcogenide assemblies (MOCHAs), low-dimensional nanostructures can be prepared that are part of a crystalline ensemble, unlocking new portions of the period table to the exploration of low-dimensional phases. Importantly, hybrid materials combine organic components which enables structural and electronic direction at the molecular scale. Here, we consider the structure and organization of mithrene- silver benzeneselenolate- a self-assembling layered hybrid structure, and examine its optoelectronic properties in the context of a 2D-like material. Synthetic manipulation of dimensionality and topology is used to prepare a family of related crystalline polymer systems, and the role of intermolecular forces and molecular geometry on the inorganic phases are considered in the context of transitions between 1D, 2D, and 3D coordination polymer systems.
Bio: J. Nathan Hohman earned his PhD in chemistry from the Pennsylvania State University in 2011, specializing in the synthesis, structure, and dynamics of ultrathin self-assembled monolayers. After a postdoctoral appointment at Stanford University department of Materials Science and Engineering investigating nanostructures for brain-machine interfaces, he joined the Molecular Foundry at Berkeley Laboratory in 2015, and led a group specializing in the systematic control and design of dimensionality and connectivity of metal-organic chalcogenolate assemblies (MOCHA), inorganic coordination polymers that pair the crystallinity and ease of growth of inorganic materials with the systematic intervention into the structure/function relationships intrinsic to soft matter.
Now at the University of Connecticut Department of Chemistry, his group aims to leverage the properties of hybrid materials to address the challenges in understanding energy, mass, and information transport in extended material systems.
Event Contact Information:
Lisa Stelzer
[email protected]
LOCATION:
  • Morningside
TYPE:
  • Seminar
CATEGORY:
  • Engineering
EVENTS OPEN TO:
  • Faculty
  • Graduate Students
  • Postdocs
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