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SUMMARY:Topotactic Anion Exchange: A Soft Chemistry Approach to Trapping a 
 Metastable Nanoparticle Phase
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20251111T160000
UID:2026-05-20-05-15-14@natsci.colostate.edu
DTSTAMP:20260520T051514
Description:About the seminar:\n\nMetastable phases of multinary metal chal
 cogenide nanoparticles (NPs) are promising materials for thin film photovo
 ltaics. The rational synthesis design of these metastable phases is a curr
 ent challenge in the field as little is known about the exact mechanism an
 d formation of many of these materials. This paper\, Band Gap Engineering
  and Metastable Phase Discovery in Cu2BaSnS4−xSex Nanocrystals via Topo
 tactic Anion Exchange by Sun et al. presents a well-rounded approach and 
 study of the formation of metastable trigonal Cu2BaSnSe4 (CBTSe) NPs. The
  trigonal phase of CBTSe NPs is calculated to have a lower band gap than t
 he stable orthorhombic phase CBTSe NPs. Sun et al. presents a synthesis ro
 ute for metastable trigonal CBTSe NPs that display properties consistent w
 ith their hypotheses: a topotactic anion exchange can stabilize the metast
 able trigonal phase. 4:00 pm
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