Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 8, Pages 1770-1777Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am900301x
Keywords
lead sulfide; nanocrystal; cluster beam deposition; titanyl phthalocyanine; X-ray photoelectron spectroscopy
Funding
- U.S. Department of Defense [W81XWH-05-20093]
- University of Wisconsin-Madison
- National Science Foundation [DMR-0537588]
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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 similar to 3-4 nm were evenly distributed in these organic films with average particle spacings of similar to 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 H2S/Ar gas ratio within the CBD source.
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