Event Scheduled for Nov 2, 2018
Event: MSE Seminar Speaker - Dr. Kurt W. Kolasinski
Time: 09:45 am
Details of Event:
The Materials Science and Engineering department invites you to a seminar by
Dr. Kurt W. Kolasinski
Professor, Department of Chemistry, West Chester University
Friday, November 2, 2018
Institute of Materials Science Building, Room 20, at 9:45 a.m.
Refreshments will be served at 9:30 a.m.
“Hierarchical Silicon Nanostructures Produced with Regenerative Electroless Etching (ReEtching), Metal Assisted Catalytic Etching (MACE) and Laser Ablation”
Abstract: ReEtching produces nanostructured Si when a catalytic agent, e.g. dissolved V2O5, is used to facilitate etching between Si and H2O2. Independent control over the extent of reaction (controlled by the amount of H2O2 added) and the rate of reaction (controlled by the rate at which H2O2 is pumped into the etchant solution) allows us to porosify Si substrates of arbitrary size, shape and doping, including wafers, single-crystal powders, polycrystalline powders, metallurgical grade powder, Si nanowires (SiNW), Si pillars and Si powders that have been textured with MACE. Similarly, improved control over the nucleation and etching in MACE is achieved by pumped delivery of reagents. Nanowires are not produced directly by MACE of powders, rather they form when a porosified layers is cleaved by capillary forces or sonication. A variety of hierarchically nanostructured Si particles can be formed by combining ReEtcing, MACE, electrochemical anodization and laser ablation. These structures include porosified SiNW, micropores (3–4 nm width) within the walls of mesopores (~17 nm width), and micropores or SiNW decorating the walls of crystallographically defined macropores. Depending on the manner of porosification, SiNW can be produced such they exhibit visible photoluminescence. The high specific surface area of nanoporous Si facilitates production of Si nanoparticles terminated with hydrocarbons by means of laser ablation in liquid organic solvents.
Bio: Kurt W Kolasinski has been Professor of physical chemistry at West Chester University since 2014 having joined the faculty in 2006. He received his BS in Chemistry from the University of Pittsburgh, where he performed undergraduate research with John T. Yates, Jr. Richard N. Zare was his PhD thesis advisor at Stanford University, where they used laser spectroscopy to investigate the dynamics of molecules scattered and thermally desorbed from solid surfaces. He performed post-doctoral research as an Alexander von Humboldt Fellow (Fritz-Haber-Institut in Berlin) and a National Research Council Resident Research Associate at the National Institute of Standards and Technology in Gaithersburg, MD then held faculty positions at the University of Birmingham (UK) (1995–2001), Queen Mary University of London (2001–2004), and the University of Virginia (2004–2006). His research focuses on surface science, laser/surface interactions and nanoscience. A particular area of expertise is the formation of semiconductor nanostructures using a variety of chemical, electrochemical and laser-based techniques. Having helped to establish an initiative at UVA concerning sustainability and energy issues, he continues to be active in this area at WCU. He is the author of over 100 scholarly publications as well as the textbooks Surface Science: Foundations of Catalysis and Nanoscience and Physical Chemistry: How Chemistry Works.
Target Audience: Not Available
Sponsored By: Materials Science and Engineering Department
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