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SUMMARY:Multimetallic Functional Nanomaterials: From Reconfigurable Plasmo
 nics to Catalysts - Emilie Ringe\, Rice University\, Houston\, USA.
DTSTART:20161124T150000Z
DTEND:20161124T160000Z
UID:TALK69022@talks.cam.ac.uk
CONTACT:Duncan Johnstone
DESCRIPTION:Successfully combining the catalytic and plasmonic properties 
 of metal nanoparticles would enable significant advances in plasmon-enhanc
 ed chemistry\, possibly including harvesting light to generate chemical fu
 els. However\, the heavily damped plasmon resonances of many catalytically
  active metals (e.g.\, Pt\, Pd) prevent this dual functionality in pure na
 nostructures. The addition of catalytic metals at or close to the surface 
 of efficient plasmonic particles\, and the creation of alloys\, thus repre
 sent enticing opportunities if the resonances can be conserved. \n\nThe fi
 rst part of this talk will discuss the behavior of bimetallic catalytic-pl
 asmonic systems including Au/Pd octopods\, Pt-decorated Au prisms\, and tr
 ansition metal-decorated Al nanocrystals. We characterize these structures
  across length scales with optical spectroscopy and electron tomography\, 
 and then show that these plasmonic nanomaterials incorporating catalytical
 ly active but heavily damped metals sustain multiple size-dependent LSPRs 
 and retain their catalytic activity. \n\nThe second part of this talk will
  discuss how electrochemistry can be used to synthesize and manipulate bim
 etallic nanostructures. First I will discuss using nanoscale electrochemis
 try to deposit Cu on the surface of Au nanoparticles in a controllable and
  spatially dependent manner that we can monitor in real time using high th
 roughput hyper spectral imaging. Secondly\, I will discuss using partial g
 alvanic replacement of Ag by Au in nanorods to create semi-hollow nanostru
 ctures encompassing an aqueous solution. By driving a hydrolysis mediated 
 Ag/Ag+ redox cycle in this trapped nanovolume\, we are able to dramaticall
 y and reversibly manipulate the internal structure\, thereby reshaping the
  plasmon-modes and introducing a new class of reconfigurable plasmonics.
LOCATION:Goldsmiths 1\, Lecture room\, Dept. of Materials Science and Meta
 llurgy
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