{"590576":{"#nid":"590576","#data":{"type":"event","title":"PhD Proposal by Young Jun Yoon","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003EDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Eon Friday, April 28, 2017\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E2:00 PM\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003Ein MOSE 2100F\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION PROPOSAL DEFENSE\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Efor\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EYoung Jun Yoon\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Strategies for Metallic Nanoparticles, Metal Chalcogenide Nanocrystals and Perovskite Quantum Dots and their Optical and Optoelectronic\u0026quot;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDr. Zhiqun Lin, Advisor, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDr. Vladimir Tsukruk, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDr. Dong Qin, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDr. Blair Brettmann, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDr. Yulin Deng, CHEME\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ENanocrystals with precisely tuned dimensions, spatial composition, and surface chemistry offers unique properties that may not be realized otherwise. This proposal takes on two distinct preparative approaches to craft such nanocrystals and explore their unique size and shape-dependent optical and optoelectronic properties.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe first approach utilizes star-like copolymers with distinct polymer blocks as nanotemplates to create nanostructured materials with precisely tuned dimensions and enhanced stability that cannot be achieved via conventional methods. In this phase of the project, we synthesize cesium-based perovskite quantum dots (CsPbX\u003Csub\u003E3\u003C\/sub\u003E QD), gold nanoparticles (Au NPs), and silver nanoparticles (Ag NPs) with\u0026nbsp; tailored dimensions that are intimately and permanently tethered with polymers by capitalizing on rationally designed star-like block copolymer poly(acrylic acid)-\u003Cem\u003Eb\u003C\/em\u003E-polystyrene (PAA-\u003Cem\u003Eb\u003C\/em\u003E-PS) as nanoreactors. By synthesizing the copolymer blocks with low polydispersity via atom transfer polymerization (ATRP), we accurately control the size of CsPbX\u003Csub\u003E3\u003C\/sub\u003E QDs and Au NPs, thus allowing strict control over light harvesting (CsPbX\u003Csub\u003E3\u003C\/sub\u003E QDs \u0026amp; Au NPs) and emission (CsPbX\u003Csub\u003E3\u003C\/sub\u003E QDs) at desired wavelengths in the visible region. Moreover, by manipulating the length of permanently tethered polymers, we improve their dispersion (CsPbX\u003Csub\u003E3\u003C\/sub\u003E QDs \u0026amp; Au NPs) and water stability (CsPbX\u003Csub\u003E3\u003C\/sub\u003E QDs).\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe second approach capitalizes on the binding site, binding strength, and steric hindrance of oligomeric ligands to control the growth of various nanocrystals. Moreover, through post-modification via click chemistry, we further improve the surface functionality of nanomaterials. In this phase of the project, we prepare metal chalcogenide nanocrystals (CdSe, CdSe\/ZnS, CdSe\/Cd\u003Csub\u003E1-x\u003C\/sub\u003EZn\u003Csub\u003Ex\u003C\/sub\u003ESe\u003Csub\u003E1-y\u003C\/sub\u003ES\u003Csub\u003Ey\u003C\/sub\u003E\/ZnS) and perovskite (CsPbX\u003Csub\u003E3\u003C\/sub\u003E) nanocrystals with high quantum yields, tuned emission wavelength, and excellent long term stability for use in lasing, light emitting diodes, scintillators, and shock sensors.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFuture work will include the use of bottlebrush-like block copolymers with distinct polymer blocks as nanotemplates to create one-dimensional nanomaterials that cannot be realized via conventional methods. We aim to craft perovskite nanorods, perovskite nanotubes, gold nanorods, and gold nanotubes that have tailorable dimensions and permanently tethered polymers as ligand by utilizing bottlebrush-like block copolymer PAA-\u003Cem\u003Eb\u003C\/em\u003E-PS and PS-\u003Cem\u003Eb\u003C\/em\u003E-PAA-\u003Cem\u003Eb\u003C\/em\u003E-PS as nanoreactors.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Strategies for Metallic Nanoparticles, Metal Chalcogenide Nanocrystals and Perovskite Quantum Dots and their Optical and Optoelectronic Properties"}],"uid":"27707","created_gmt":"2017-04-18 17:20:39","changed_gmt":"2017-04-19 13:24:51","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-04-28T15:00:00-04:00","event_time_end":"2017-04-28T17:00:00-04:00","event_time_end_last":"2017-04-28T17:00:00-04:00","gmt_time_start":"2017-04-28 19:00:00","gmt_time_end":"2017-04-28 21:00:00","gmt_time_end_last":"2017-04-28 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}