title: Hydroxylation of the surface of PbS nanocrystals passivated with oleic acid.
abstract: Controlling the structure of colloidal nanocrystals (NCs) is key to the generation of their complex functionality. This requires an understanding of the NC surface at the atomic level. The structure of colloidal PbS NCs passivated with oleic acid has been studied theoretically and experimentally. We show the existence of surface OH(-) groups, which play a key role in stabilizing the PbS(111) facets, consistent with x-ray photoelectron spectroscopy as well as other spectroscopic and chemical experiments. The role of water in the synthesis process is also revealed. Our model, along with existing observations of NC surface termination and passivation by ligands, helps to explain and predict the properties of NCs and their assemblies.
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Danylo
authors.initials: D
authors.lastname: Zherebetskyy
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Marcus
authors.initials: M
authors.lastname: Scheele
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Applied Science and Technology Graduate Program, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Noah
authors.initials: N
authors.lastname: Bronstein
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Christopher
authors.initials: C
authors.lastname: Thompson
authors.affiliation: The Molecular Foundry, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA.
authors.forename: David
authors.initials: D
authors.lastname: Britt
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Miquel
authors.initials: M
authors.lastname: Salmeron
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Alivisatos
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. lwwang@lbl.gov.
authors.forename: Lin-Wang
authors.initials: LW
authors.lastname: Wang