Poly , fluorescence SNOM

Figure 19.8 Fluorescence SNOM images of a phase-separated blend of polystyrene and poly (9,9-dioctylfluorene). (a-c) Surface topography, transmittance, and fluorescence images, respectively (d and e) Mapping of the amplitude and lifetime of the fluorescence decay...

Fluorescence-SNOM [45] was used for studying the phase behavior of a polymer blend monolayer which consisted of dye-laheled poly(octadecyl methacrylate) (PODMA) and poly(isobutyl methacrylate) (PiBMA), both of which formed stable monolayers at the air-water interface. FRET was observed in the PODMA-rich domain, indicating a mixing of both components at the molecular level. When the temperature was raised to 40 °C, however, phase separation occurred within several minutes and the domain size increased with annealing time. The 2D structure for the completely phase-separated monolayer was studied using time-resolved SNOM. 

Fig. 20 SNOM images of a 250 nm thick film of poly(9,9-didodecylfluorene) prepared by spin coating from toluene solution (a) topography, (b) total fluorescence intensity calculated from sum of the two polarized images (c) and (d) fluorescence collected simultaneously at orthogonal polarization, (e) anisotropy image calculated from panels c and d, and (f) simulated anisotropy image assuming the polymers are perfectly oriented in 15 nm cubic domains. Reprinted with permission of [68], copyright (2000) American Chemical Society...

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