{"613929":{"#nid":"613929","#data":{"type":"event","title":"PhD Defense by Yiren Wu","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 Tuesday, November 20, 2018\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E1:00 PM\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003Ein MoSE 3201A\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 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\u003EYiren Wu\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026ldquo;Colloidal Silver Nanocrystals and Their Derivatives:\u0026nbsp;\u003C\/strong\u003E\u003Cstrong\u003E\u0026nbsp;Synthesis, Properties, and Applications\u003C\/strong\u003E\u003Cstrong\u003E\u0026rdquo;\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\u003EProf. Dong Qin, Advisor, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Zhiqun Lin, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Vladimir Tsukruk, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Angus Wilkinson, CHEM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Donggang Yao, MSE\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\u003E\u003Ca name=\u0022_Toc439062360\u0022\u003ESilver nanocrystals have received growing interests owing to their fascinating\u003C\/a\u003E\u0026nbsp;localized surface plasmon resonance (LSPR) properties and spectacular applications in surface-enhanced Raman scattering (SERS). Despite remarkable success, Ag nanocrystals are highly susceptible to oxidative etching\u0026nbsp;and only exhibit limited catalytic activities. To address these issues, the\u0026nbsp;first part of my thesis documents the development of synthetic approaches to enrich Ag nanocrystals with a second noble metal for the generation of Ag@Ag-Pd core-frame nanocubes and Ag@SiO\u003Csub\u003E2\u003C\/sub\u003E\/Au nanoparticles. I also demonstrated these bimetallic nanocrystals as bifunctional probes for\u0026nbsp;\u003Cem\u003Ein situ\u003C\/em\u003E\u0026nbsp;monitoring the catalytic reactions\u0026nbsp;by SERS.\u0026nbsp;In the second part of this thesis, I turned the synthesis of Ag@Ag-Pd core-frame nanocubes into a model system for investigating the heterogeneous nucleation in nanocrystal growth with a molecular probe.\u0026nbsp;I demonstrated\u0026nbsp;that 2,6-dimethylphenyl isocyanide was a sensitive probe for\u0026nbsp;\u003Cem\u003Ein situ\u003C\/em\u003E\u0026nbsp;atomic-level tracking of the heterogeneous nucleation of Pd on Ag nanocubes by SERS. I discovered that the isocyanide group could bind to one, two, and three adjacent Pd atoms to generate the atop, bridge, and hollow binding configurations, respectively, and give different vibrational frequencies, making it possible to characterize Pd atoms being deposited onto different facets of Ag nanocubes.\u0026nbsp;This\u0026nbsp;\u003Cem\u003Ein situ\u0026nbsp;\u003C\/em\u003ESERS\u0026nbsp;offers an opportunity to investigate the role of reaction temperature and the type of Pd(II) precursor in affecting\u0026nbsp;the reduction, deposition, and surface diffusion involved in heterogeneous nucleation.\u0026nbsp;Collectively, my thesis opens up new possibilities for the\u0026nbsp;rational\u0026nbsp;design and\u0026nbsp;synthesis of bimetallic nanocrystals involving Ag and another noble metal such as\u0026nbsp;Pt,\u0026nbsp;Ru, Rh, and Ir.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Colloidal Silver Nanocrystals and Their Derivatives:  Synthesis, Properties, and Applications"}],"uid":"27707","created_gmt":"2018-11-06 20:03:19","changed_gmt":"2018-11-06 20:03:19","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2018-11-20T13:00:00-05:00","event_time_end":"2018-11-20T15:00:00-05:00","event_time_end_last":"2018-11-20T15:00:00-05:00","gmt_time_start":"2018-11-20 18:00:00","gmt_time_end":"2018-11-20 20:00:00","gmt_time_end_last":"2018-11-20 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}