Passivation and Stabilization of InP Nanocrysals with Organic Halide Ion Salts

The surface coordination chemistry of InP nanocrystals prepared from oleylamine, indlum chloride and aminophosphines was investigated following synthesis, purification, and ligand exchange. ¹H, ³¹P, and ¹⁹F nuclear magnetic resonance and Fuorier transform infrared absorption spectroscopy were used to quantify the surface ligand coverages and to monitor the ligand reaction with ammonium halides, diethyl zinc, phosphine, and chlorotrimethyl silane reagents. The coverage of tetralkylaminophosphonium chloride, alkylammonium fluoride, metal halide surface ligands were determined. The findings will be discussed in light of the metal rich stoichiometry and the steric constraints of packing surface passivating ligands.