Surface Functionalization of ZnO Reuben T. Collins, Colorado School of Mines, DMR 0606054 Metal oxide nanostructures are under active investigation for hybrid organic/inorganic device applications. Performance is limited, however, by an inability to control both the structural and electronic characteristics of the interface. To address this issue, a siloxane-based molecular monolayer functionalization of the ZnO surface has been demonstrated using octadecyltriethoxysilane (OTES). The monolayer creates a stabilized hydrophobic (0001) ZnO surface. When coated with the semiconducting polymer, poly(3-hexylthiophene), improved polymer ordering and charge transfer across the interface are observed. Using triexthoxysilane- based molecules with different organic end groups, the same attachment strategy can be used to tune the chemistry of the ZnO surface for different applications. Water contact angles on ZnO surfaces with different surface treatments. UV ozone cleaned Toluene cleaned OTES treated Infrared absorption of C-H stretch modes on OTES treated ZnO surfaces. A treated silicon surface is shown for comparison. Variations in integrated intensity correlate with