Layered WO 3/4,4′ BPPOBp self assemble mulitlayers (SAMs) films have been fabricated by polyelectrolytes (PEs) approach.The SAMs films with well ordered superlattice structure and d space of 0.695nm and good photochromic property have been studied by employing UV visible,small angle XRD and XPS.
A novel high- efficient photochromic self- assembly multilayered film has been fabricated from WO3 and 1,10- DAD solution using molecular deposition technique.The dependence of photochromic behavior on aggregation of WO3 in the WO3- polymer/1,10- DAD self- assembly film was discussed in comparison with WO3/ 4,4′ - BAMBp system.The results clearly show that organic molecules determine the charge density of the substrate,then affect the assembled structure of inorganic precursor and the stablility of the photo- induced charge- transfer complexes,and thus manipulate the structure and the photochromic properties of the films.
Perylene nanocrystals with different sizes(10-250 nm) were prepared by reprecipitation. Compared with the absorption spectrum of perylene acetone solution, a new J aggregate absorption peak appeared in the absorption spectra of nanocrystals. With the decrease of perylene nanocrystals size, it shows a blue shift in the absorption spectra. This blue shift is due to the size dependent property. The perylene concentration of initial acetone solution or the amount of solution injected into water, the aging time of organic nanocrystal dispersion and the adding of surfactant were the influencing factors of nanocrystal growth. We can gain the required microcrystals of different sizes by controlling the conditions of growth.
