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DTSTART;TZID="Pacific Time (US & Canada)":20250214T103000
DTEND;TZID="Pacific Time (US & Canada)":20250214T120000
SUMMARY:The School of Mechanical and Materials Engineering Seminar Series, “Emergent Phenomena in Old Materials” Presented by Dr. Kevin Kittilstved
LOCATION:Engineering Teaching Research Laboratory (ETRL), Pullman, WA
DESCRIPTION: \n\nEmergent Phenomena in Old Materials\n\nPresented by\n\nDr. Kevin Kittilstved, Professor, Department of Chemistry, Washington State University\n\nAbstract:\n\nThe electronic structure and functionality of semiconductors is largely dictated by the presence of defects in the lattice. Aliovalent transition metal dopants in bulk oxide semiconductors are well-known multifunctional materials with potential application in visible light photocatalysis, spintronics and optoelectronics. However, these types of materials have received little attention as nanocrystalline materials. In this talk, I will present our recent work on the synthesis and characterization of transition-metal dopants in colloidal metal oxide nanocrystals, namely strontium titanate and barium titanate. We have discovered unique electronic structures that can be easily exploited in these aliovalent diluted magnetic semiconductors through the introduction of charge carriers using UV excitation in the presence of sacrificial reducing agents. I will also demonstrate the tunability and reversibility of this post-synthetic modification of the nanocrystals to study the interactions between dopants and free carriers that are enhanced in these nanomaterials. In conclusion, I will compare these aliovalent DMSs to the more common isovalent DMSs.\n\nBiography:\n\nBorn in Spokane\n\nBS Chemistry Gonzaga University\n\nPhD Chemistry University of Washington\n\nPostdoc at University of Geneva\n\nAssistant/Associate/Full Professor of Chemistry at UMass Amherst until 2024\n\nStarted at WSU Chemistry in Fall 2024.\n\n 
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