{"115711":{"#nid":"115711","#data":{"type":"event","title":"Prof. Jonathan Owen, Columbia University","body":[{"value":"\u003Cp\u003EProf. Jonathan Owen, Columbia University\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003E\u003Cstrong\u003EThe coordination chemistry of cadmium selenide nanocrystals\u003C\/strong\u003E\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003ESchool Colloquium\u003C\/p\u003E\u003Cp\u003ESurfaces dominate the properties of colloidal semiconductor nanocrystals. Characterizing and controlling surface\u0026nbsp;coordination\u0026nbsp;chemistry\u0026nbsp;is therefore crucial to their application in optoelectronics and fluorescence labeling. I will describe our picture of nanocrystal surface structure as well as a novel\u0026nbsp;ligand exchange technique that allows us to fabricate semiconductor films using solution techniques.\u0026nbsp;\u0026nbsp;In particular, we have exchanged carboxylate ligands for chloride ligands in the presence of alkylphosphines and prepared thin film transistors with unusually high electron mobilities (8 cm^2\/V\/sec). In addition, using 31P NMR spectroscopy we monitor the binding and exchange of\u0026nbsp;tri-n-alkylphosphines\u0026nbsp;and can estimate the relative binding affinities of amines, phosphines and phosphine oxides. I will also briefly discuss our work on the structural characterization of large semiconductor molecules or molecular clusters.\u003C\/p\u003E\u003Cp\u003EFor more information contact Prof. Joseph Sadighi (404-385-2244).\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EProf. Jonathan Owen, Columbia University\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003E\u003Cstrong\u003EThe coordination chemistry of cadmium selenide nanocrystals\u003C\/strong\u003E\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003ESchool Colloquium\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":"","uid":"27275","created_gmt":"2012-03-09 11:47:00","changed_gmt":"2016-10-08 01:58:20","author":"Shirley Tomes","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2013-02-21T20:00:00-05:00","event_time_end":"2013-02-21T21:00:00-05:00","event_time_end_last":"2013-02-21T21:00:00-05:00","gmt_time_start":"2013-02-22 01:00:00","gmt_time_end":"2013-02-22 02:00:00","gmt_time_end_last":"2013-02-22 02:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"related_links":[{"url":"http:\/\/www.cise.columbia.edu\/efrc\/people\/principle-investigators\/jonathan-owen\/","title":"Prof. Jonathan Owen"}],"groups":[{"id":"85951","name":"School of Chemistry and Biochemistry"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EShirley Tomes (404-894-0591) \u003Ca href=\u0022mailto:shirley.tomes@chemistry.gatech.edu\u0022\u003Eshirley.tomes@chemistry.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}