{"593576":{"#nid":"593576","#data":{"type":"event","title":"PhD Defense by Xiaojun Sun","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 Wednesday, August 2, 2017\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E10:00 AM \u0026ndash; 12:00 PM\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003Ein MoSE 1201A\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\u003EXiaojun Sun\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;Bimetallic Nanocrystals for Applications in Plasmonics and Catalysis\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. Meilin Liu, 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. Zhiqun Lin, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Z. John Zhang, CHEM\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\u003EBimetallic nanocrystals have received growing interest owing to their diversified properties and promising applications. Seeded growth serves as a powerful route to bimetallic nanocrystals but its capability is limited by galvanic replacement reaction when the seed is more reactive than the deposited metal. This dissertation documents two strategies for achieving galvanic replacement-free seeded growth of a second metal (M: Au, Pd, or Pt) on Ag nanocrystals. The first strategy relies on the co-titration of AgNO\u003Csub\u003E3\u003C\/sub\u003E and a precursor to M for the generation of Ag and M atoms \u003Cem\u003Evia\u003C\/em\u003E co-reduction, followed by the co-deposition on Ag nanocubes for the generation of Ag@Ag-M core-frame nanocubes. The resultant Ag@Ag-Au core-frame nanocubes exhibit enhanced surface-enhanced Raman scattering (SERS) activity at an excitation wavelength of 785 nm. On the other hand, the Ag@Ag-Pd nanocubes can play as a dual catalyst for probing stepwise catalytic reduction and oxidation reactions by SERS. The second strategy involves the use of hydroxide to transform Ag nanocubes into Ag@Au and Ag@Pt core-shell nanocubes under an alkaline condition. Upon the removal of Ag cores, the Ag@Au core-shell nanocubes can be converted into Au nanoboxes with wall thickness less than 2 nm and well-defined openings at corners. These nanoboxes embrace strong absorption in the near-infrared region for potential biomedical applications. In comparison, the Ag@Pt nanocubes can be transformed into Pt-based nanocages. These nanocages exhibit improved catalytic activity toward the oxygen reduction reaction (ORR). Collectively, this work greatly expands the utility of seeded growth for the rational design and synthesis of bimetallic nanocrystals with well-defined structures and desired properties.\u0026nbsp;\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":"Bimetallic Nanocrystals for Applications in Plasmonics and Catalysis"}],"uid":"27707","created_gmt":"2017-07-19 14:10:36","changed_gmt":"2017-07-19 14:10:36","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-08-02T11:00:00-04:00","event_time_end":"2017-08-02T13:00:00-04:00","event_time_end_last":"2017-08-02T13:00:00-04:00","gmt_time_start":"2017-08-02 15:00:00","gmt_time_end":"2017-08-02 17:00:00","gmt_time_end_last":"2017-08-02 17:00:00","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":"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":""}}}