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Hoffman Estates High School ESRP 2018

Characterizing the Structure of Self-Assembled Lead (II) Sulfide Nanoparticle Superlattices Based on Variable Ligand Surface Coverage

Authors:

  • Students:
    • Ariana Correia
    • Amber Dellacqua
    • Ray Klest
    • Jonathan Kolweier
    • Matt Vlasaty
    • Hana Wakefield
    • Shraddha Zina
  • Teachers:
    • Wayne Oras
  • Mentors:
    • Mrinal Kanti Bera (University of Chicago, Center for Advanced Radiation Sources)
    • Elena Shevchenko (Argonne National Laboratory, Center for Nanoscale Materials)

Advanced Photon Source Sector 15: ChemMatCARS; Center for Nanoscale Materials

Inorganic nanoparticles (NPs) coated with interfacial organic molecules known as ligands are able to self-assemble into complex three-dimensional structures . Periodic crystal lattices of NPs known as superlattices possess useful chemical, electrical, and magnetic properties . An important objective within the field of nanotechnology is to understand how parameters of the self assembly process can be tuned to reach a desired outcome, such as a superlattice. The surface coverage of ligands and the type of solvent used during self-assembly are known to determine the organization of NPs and shape of the nanostructure. Studying the effects of these properties will contribute to a general understanding of how nanostructures form. Lead (II) sulfide (PbS) nanostructures are of particular interest for their potential to be used as a semiconductor material . Interparticle spacing and structural ordering are the determining factors of the charge transport properties of superlattices . We investigated the relationship between these factors and ligand surface coverage in binary PbS superlattices formed with various solvent mixtures. Tests were performed using small angle x ray scattering (SAXS) at the Advanced Photon Source (APS) and scanning electron microscopy (SEM) at the Center for Nanoscale Materials (CNM).

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