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SUMMARY:Developing Stoichiometric Syntheses to Understand Reaction Pathways
  en Route to Cu-P-Se Nanoparticles
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20231017T160000
UID:2026-03-15-23-44-02@natsci.colostate.edu
DTSTAMP:20260315T234402
Description:Abstract:\n\nDespite the wide range of applications of nanopart
 icles\, the tunability of properties and synthesis of novel materials are 
 limited due to reaction pathways often being poorly understood. Developing
  an understanding of how precursors transform into active species or monom
 ers is essential to establish targeted synthetic designs but is difficult 
 to predict the participating species with the absence of balance equations
 . Reported here is a more developed reaction pathway for Cu-P-Se based ter
 nary phases\, Cu­­3PSe4 and Cu7PSe6. By decreasing solvent reactivity to
  vary active selenium species for the conversion of Cu­3P to Cu3PSe4\, a 
 simplified synthetic scheme has been established that has allowed for a ba
 lanced\, stoichiometric equation. Further analysis of the Cu3PSe4 pathway 
 led to the identification of characteristic copper selenium binaries\, Cu0
 .87Se and Cu2-xSe\, were identified as quenched intermediates for Cu3PSe4 
 and Cu7PSe6\, respectively. Additionally\, extrapolating the synthetic kno
 wledge from the Cu3PSe4 system\, when altering the Se precursor to molecul
 ar diselenide species with large C-Se bond energies\, isolates the Cu7PSe6
  phase (metastable) over Cu3PSe4. Thus\, implementing this synthetic appro
 ach allows for stoichiometric control of colloidal nanoparticle synthesis 
 and promotes opportunities to target desired materials. 4:00 pm
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