Nathan Neisius
Speaker's Institution
Colorado State University
Chemistry A101
Mixer Time
Mixer Time
Chemistry B101E
Calendar (ICS) Event
Additional Information


Despite the wide range of applications of nanoparticles, 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 monomers 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 ternary 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 balanced, 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 knowledge from the Cu3PSe4 system, when altering the Se precursor to molecular diselenide species with large C-Se bond energies, isolates the Cu7PSe6 phase (metastable) over Cu3PSe4. Thus, implementing this synthetic approach allows for stoichiometric control of colloidal nanoparticle synthesis and promotes opportunities to target desired materials.