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.
Poly(TMPD)/MoO3 was constructed via a cooperative formation route from TMPD and molybdate ammonium at acidified conditions.XRD data showed a layered structure along c axis.IR and Raman spectra confirmed that TMPD had been polymerized and intercalated into MoO3 layers.TGA curve gave the composition of [poly(TMPD)]0.23MoO3(H2O)0.31.Meanwhile,it was found that MoO3 accelerated the polymerization process of TMPD by entrapping the polymer and disturbing the balance between monomer and polymer with deposition of Poly(TMPD)/MoO3.According to this mechanism,a design for constructing layered polymer/MoO3 was proposed and a scheme was drawn also.
