Abstract
Using the dilution technique of developing solution and the flow-orientation method, we successfully fabricated a well-defined Langmuir monolayer and Langmuir-Blodgett (LB) films of 4-dimethylamino-4'-nitrostilbene (DANS). The dilution technique of developing solutions allows formation of a two-dimensional film of DANS below the certain concentration. X-ray diffraction (XRD) and ultraviolet visible (UV-VIS) spectroscopy revealed the LB film structures. The XRD data indicated that DANS tilted at an angle of 10 degrees to the normal of the substrate. The UV-VIS spectra of the LB films showed molecular organization with a stable condensed phase. The spectral peaks from the LB films shifted to a shorter wavelength as compared with those from DANS solution. The blue shift of the UV-VIS spectra may reflect intermolecular stacking of nitrostilbene chromophore, and consequently formation of a π-electron band.
