oxide (99%), trioctylphosphine (TOP, 97%), selenium powder (Se, 99.99%),
and lead(II) acetate trihydrate (Pb(CH3CO2)2·3H2O, 99.999%) were purchased from Strem
Chemicals. Octadecylphosphonic acid (99%) was purchased from Polycarbon
Industries. Copper(II) acetylacetonate (Cu(acac)2, 97%),
hexadecylamine (98%), tetrakis(acetonitrile)copper(I) hexafluorophosphate
(99.99%), octadecene (technical grade, 90%), 1-dodecanethiol (≥98%),
oleylamine (70%), tetrachloroethylene (≥99%), anhydrous chloroform,
methanol, toluene, and tetrahydrofuran were purchased from Sigma-Aldrich.
All chemicals were used without any further purification.