PHYS 505 |
| Lead sulfide nanocrystals (PbS NCs) have shown potential for use in optoelectronic applications due in part to their size-tunable band gap. PbS NCs are grown directly into a polymer matrix to control the size and surface chemistry of the resulting NCs. Transmission electron microscopy shows that PbS nanocomposites grown by either colloidal techniques or gaseous deposition using a cluster beam deposition source contain PbS NCs. Photoemission spectroscopy is used to study PbS nanocomposite films prepared by both methods. X-ray photoelectron spectroscopy (XPS) confirms that PbS is present and that there is no significant bonding between the PbS NCs and the polymer. Soft-XPS using photon energies of 200-300 eV available at a synchrotron radiation source provides surface sensitivity to observe the interaction of the PbS NC surface with the polymer matrix and is compared to results obtained using 1487 eV photon energy. |
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PHYS Poster Session - Nanostructured Materials and Nanophotonics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster
Division of Physical Chemistry |