PHYS 190 |
| Lead sulfide nanocomposites are being examined for applications in photodetectors, light-emitting diodes, and photovoltaics. The optoelectronic properties of the composite can be tuned by varying the nanoparticle size and concentration within the organic matrix. Lead sulfide nanocomposite films are deposited with a modified commercial cluster beam deposition source. Transmission electron microscopy demonstrates that gaseous deposition can synthesize a composite film with <5 nm diameter lead sulfide nanocrystals of narrow size distribution embedded within either titanyl phthalocyanine or sexithiophene matrices. Nanocrystal inclusion increases the absorbance in the visible region compared to the organic matrix alone. X-ray photoelectron spectroscopy shows no oxidation or significant bonding between the nanocrystal and matrix. Nanocrystal formation via gaseous deposition displays advantages over traditional colloidal synthesis in the control of oxidation and particle density. |
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Nanostructured Materials
8:20 AM-12:00 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 338/339, Oral
Division of Physical Chemistry |