BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Nanoparticle Shape: Effects and Modeling - Emilie Ringe\, Northwes
 tern University\, Evanston\, Illinois\, USA
DTSTART:20110914T140000Z
DTEND:20110914T150000Z
UID:TALK32698@talks.cam.ac.uk
CONTACT:Caterina Ducati
DESCRIPTION:Interest in nanotechnology is driven by unprecedented properti
 es tailorability\, achievable by controlling particle structure and compos
 ition. Unlike bulk components\, minute changes in size and shape affect th
 e optical and electronic properties of nanoparticles. Characterization of 
 such structure-function relationships and better understanding of structur
 e control mechanisms is crucial to the development of novel applications s
 uch as plasmonic sensors and devices.\n\nThe first part of this talk will 
 focus on new analytical models developed to understand the structure and c
 omposition of nanoparticles. One such model describes segregation effects 
 in small (2-10 nm) alloy nanoparticles\, where the thermodynamic Wulff con
 struction becomes size dependent and the infinite reservoir approximation 
 breaks down [1]. Another model discussed involves the interplay of surface
  properties and crystallographic defects on the kinetic growth of twinned 
 nanoparticles. From this approach one can explain shapes which cannot curr
 ently be understood using thermodynamic models.\n\nThe second part will co
 ver recent experimental advances in correlated single particle optical and
  structural characterization\, which provide new hindsight on the effects 
 of size and shape on plasmonic properties such as resonance frequency\, fi
 eld enhancement\, plasmon decay\, and refractive index sensitivity [2-4]. 
 Specific results discussed include those obtained by 1) performing high th
 roughput correlated measurements\, 2) coupling single particle refractive 
 index sensitivity measurements with spectral and structural characterizati
 on\, and 3) taking advantage of large size and shape inhomogeneities to de
 velop quantitative models for structural effects and their interplay.\n\n\
 n[1] Ringe\, E.\; Van Duyne\, R. P.\; Marks\, L. D. Nano Lett. 2011\, 11\,
  3399.\n[2] Ringe\, E.\; McMahon\, J. M.\; Sohn\, K.\; Cobley\, C. M.\; Xi
 a\, Y.\; Huang\, J.\; Schatz\, G. C.\; Marks\, L. D.\; Van Duyne\, R. P. J
 . Phys\, Chem. C 2010\, 114\, 12511.\n[3] Henry\, A.-I.\; Bingham\, J. M.\
 ; Ringe\, E.\; Marks\, L. D.\; Schatz\, G. C.\; Van Duyne\, R. P. J. Phys.
  Chem. C 2011\, 115\, 9291.\n[4] Kleinman\, S. K.\; Ringe\, E.\; Valley\, 
 N.\; Wustholz\, K. L.\; Phillios\, E.\; Scheidt\, K. A.\; Schatz\, G. C.\;
  Van Duyne\, R. P. J. Am. Chem. Soc. 2011\, 133\, 4115.\n
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
END:VEVENT
END:VCALENDAR