title: Cluster beam deposition of lead sulfide nanocrystals into organic matrices.
abstract: Lead sulfide nanocrystals (PbS NCs) were codeposited into two organic films, titanyl phthalocyanine (TiOPc) and alpha-sexithiophene, using cluster beam deposition (CBD). NCs of average diameters of approximately 3-4 nm were evenly distributed in these organic films with average particle spacings of approximately 4 nm, as determined by transmission electron microscopy. The film composition and NC surface chemistry were monitored by X-ray photoelectron spectroscopy (XPS) and other methods. Pb:S stoichiometry in the NC/TiOPc film was determined by XPS to correspond to the PbS cubic rock salt structure. Soft-XPS using 200 eV energy photons determined the NC-organic surface chemistry by resolving the S 2p core level into four distinct components for sulfur. The soft-XPS results found that the PbS NC surface chemistry could be tuned by varying the H(2)S/Ar gas ratio within the CBD source.
authors.affiliation: Department of Chemistry, University of Illinois at Chicago (m/c 111), Chicago, Illinois 60607-7061, USA.
authors.forename: Adam M
authors.initials: AM
authors.lastname: Zachary
authors.forename: Igor L
authors.initials: IL
authors.lastname: Bolotin
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Asunskis
authors.forename: Amanda T
authors.initials: AT
authors.lastname: Wroble
authors.forename: Luke
authors.initials: L
authors.lastname: Hanley