title: Colloidal 3-Mercaptopropionic Acid Capped Lead Sulfide Quantum Dots in a Low Boiling Point Solvent.
abstract: Colloidal 3-mercaptopropionic acid (3-MPA) capped lead sulfide quantum dots were prepared in a variety of organic solvents stabilized with a quaternary ammonium halide salt. The stabilized colloids' optical properties were studied through optical absorption and emission spectroscopy and found to be dependent on both the concentration of a new ligand and stabilizer, and sample age. Nanocrystal ligand chemistry was studied through a combination of1H NMR and two-dimensional Nuclear Overhauser Effect Spectroscopy (NOESY) which revealed full displacement of the original oleate ligand to form a dynamically exchanging ligand shell. The colloids were studied optically and via NMR as they aged and revealed a quantitative conversion of monomeric 3-mercaptopropionic acid to its dimer, dithiodipropionic acid (dTdPA).
authors.affiliation: Department of Chemistry, Portland State University , 1719 SW 10th Avenue, Portland, Oregon 97201, United States.
authors.forename: Chase C
authors.initials: CC
authors.lastname: Reinhart
authors.affiliation: Department of Chemistry, Portland State University , 1719 SW 10th Avenue, Portland, Oregon 97201, United States.
authors.forename: Erik
authors.identifier: 0000-0001-5372-3956
authors.initials: E
authors.lastname: Johansson