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SUMMARY:Symmetry Making and Breaking in Seeded Syntheses of Metal Nanocrys
 tals
DTSTART:20191122T110000
DTEND:20191122T120000
DTSTAMP:20260513T001942Z
UID:98f5a8892fda5dc1d21f6ea727bffb1722eea2d9318a64d135b46a70
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Sara Skrabalak\nChemistry Department\, Indiana University\
 , USA\n\n \nCrystal growth theory predicts that heterogeneous nucleation 
 will occur preferentially at defect sites\, such as the vertices rather th
 an the faces of shape-controlled seeds. Platonic metal solids are generall
 y assumed to have vertices with nearly identical chemical potentials\, and
  also nearly identical faces\, leading to the useful generality that heter
 ogeneous nucleation preserves the symmetry of the original seeds in the fi
 nal product. This presentation will discuss how this generality can be use
 d to access stellated metal nanocrystals with high and tunable symmetries 
 for applications in plasmonics. This presentation will also discuss the li
 mits of this generality in the extreme of low supersaturation. A strategy 
 for favoring localized deposition that differentiates between both differe
 nt vertices and different edges or faces\, i.e.\, regioselective depositio
 n\, will be demonstrated. Such regioselective heterogeneous nucleation was
  achieved at low supersaturation by a kinetic preference for high-energy d
 efect-rich sites over lower-energy sites. This outcome was enhanced by usi
 ng capping agents to passivate facet sites where deposition was not desire
 d. Collectively\, the results presented provide a model for breaking the s
 ymmetry of seeded growth and for achieving regioselective deposition.\n\nR
 eferences\n [1] R. G. Weiner\, M. R. Kunz\, S. E. Skrabalak\, Acc. Chem. 
 Res. 48 (2015)\, 2688-2695.\n [2] A. N. Chen\, M. M. Scanlan\, S. E. Skra
 balak\, ACS Nano 11 (2017)\, 12624-12631.\n \nAcknowledgements \nUS Natio
 nal Science Foundation\, Division of Chemistry #1602476\n 
LOCATION:Tseuzier\, I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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