| Summary: | 碩士 === 國立交通大學 === 應用化學系所 === 97 === A bispyrenyl monofunctionalized isobutyl-polyhedral oligomeric silsesquioxane (butterfly-like BPy-POSS) is synthesized by Pt (0)-catalyzed hydrosilylation between silane-monofunctional isobutyl-POSS and bispyrenyl alkene. By DSC, we found that BPy-POSS is a polymer-like semi-crystal molecule. Strong excimer emission was observed in PL spectra. Blends of BPy-POSS and isobutyl-POSS were fabricated to investigate their microstructures. Fern-like microstructures can be seen by OM and AFM; we suspected that the cause of forming fern-like structures is POSS-POSS recognition. During solvent evaporation, i-Bu POSS crystallize as a POSS template, and then BPy-POSS dispersed on the surface of POSS template. The data of XRD and DSC could be an evidence of phase separation of i-Bu POSS and BPy-POSS.
We used these self-assembled films to do the application of attachment to nitroaromatic compounds. Upon exposure to nitrobenzene vapor, the films show fast fluorescence quenching. The high performance is based on the microstructure of BPy-POSS and i-Bu POSS on the film surface. Using the self-assembled blend thin films of i-Bu POSS and BPy-POSS, we could achieve the goal of detection of nitrobenzene by using small amount of BPy-POSS.
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