title: Probing the surface of colloidal nanomaterials with potentiometry in situ.
abstract: Colloidal nanomaterials represent an important branch of modern chemistry. However, we have very little understanding of molecular processes that occur at the nanocrystal (NC) surface during synthesis and post-synthetic modifications. Here we show that potentiometry can be used to study the surface of colloidal NCs under realistic reaction conditions. Potentiometric titrations of CdSe and InP nanostructures provide information on the active surface area, the affinity of ligands to the NC surface, and the surface reaction kinetics. These studies can be carried out at different temperatures in polar and nonpolar media for NCs of different sizes and shapes. In situ potentiometry can provide real-time feedback during synthesis of core-shell nanostructures.
authors: Department of Chemistry and James Franck Institute, The University of Chicago , Chicago, Illinois 60637, United States.
authors: Igor
authors: I
authors: Fedin
authors: Dmitri V
authors: DV
authors: Talapin
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004867:Equipment Design; D008024:Ligands; D053758:Nanoparticles / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D011199:Potentiometry / Q000379:methods*; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature
chemical_list: D019187:Cadmium Compounds; D003102:Colloids; D008024:Ligands; D018036:Selenium Compounds; D012997:Solvents; C058667:cadmium selenide