COLL 197 |
| Abstract: 3-mercaptopropyltrimethoxysilane (MPS) capped (CdSe)ZnS quantum dots (QDs) were prepared by the ligand exchange process. The surface chemistry behavior of MPS capped (CdSe)ZnS QDs at the air-water interface for different subphase pH was studied by various physical measurements. The time effect data showed that hydrolysis and condensation rates were much faster in the acidic and basic subphases than the neutral one. Stability experiments indicated that the polymerization took place in the MPS-QDs Langmuir monolayer at pH 1.5 and 12.0. The epifluorescence images of the MPS QDs Langmuir monolayer revealed that the polymerization Langmuir monolayer was more homogeneous. Langmuir and Langmuir-Blodgett monolayers analyzed by Infrared Reflection Absorption Spectroscopy (IRRAS) and X-ray Photoelectron Spectroscopy (XPS) confirmed the polymerization in 2D, respectively. |
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Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster
Division of Colloid & Surface Chemistry |