Study On UV And CN~- Responsive Functional Materials With Inverse Opal Structure

Photonic crystals are the artificial crystals where two or more materials with different dielectric constants self-assemble periodically according to some special rules This unusual structure could forbid light being propagated as the wavelength of the incident light match with the dielectric constants change By changing lattice spacing or relative refractive index, the wavelength of diffractive light could be easily modulated due to the essence that photonic crystals meet the Bragg Diffraction Equation So there have been finishing so many works to adjust the wavelength of the diffractive light by using special environmental stimuli, such as light, electric field, magnetic field, temperature or ions and so forth, to modify the lattice spacing or the relative refractive index, that's to say, the transformation of the lattice spacing or relative refractive index can induce the transformation of the wavelength of the diffractive light, and vice versa Based on the aforementioned principle about photonic crystals, in this dissertation, two functional groups introduced into photonic crystals that can dimerize reversibly under UV irradiation of diverse wavelengths (cinnamate group) or interact with cyanide anion (trifluoroacetyl group) can transform the wavelength of diffractive lights, indicating the light-induced reversible dimerization and the existence of cyanide anion.First of all, in this dissertation, based on the photonic crystals structure and the cinnamate containing functional monomer, a functional material with inverse opal structure has been prepared, and the dependence of cross-linker and comonomer on plastic modulus Due to the occurrence of cinnamate group which could undergo reversible addition reaction upon irradiation of UV of various wavelengths, this inverse opal structure could be deformed by the reversible addition reaction, causing reversibly the transferring of diffraction peaks And the transferring scale is influenced not only via the quantity of cinnamate groups, but also via the plastic modulus of this inverse opal structure Meanwhile, this cinnamate-based photonic structure was found that it could keep its original state under thermal fluctuations And comparing to azobenzene- or spiropyran-based photonic structure, it is supreme priority for the cinnamate-based photonic structure to have the thermal stability This remarkable thermal stability is favorable for the practical application of photonic crystals in optical data storage.On the other hand, a sensing cyanide anion material has been prepared in the basis of thermal polymerization of a trifluoroacetyl group containing monomer in the voids of photonic crystals And this sensing material is so sensitive and rapid that it could sense as low as 10^-7mol/L CN^- owing to its 3D inner interconnected holes Contrasted with F^-, Ac^- and H₂PO₄^-, this inverse-opal material could better sense CN^- selectively As a solid sensing cyanide material, trifluoroacetyl group containing inverse-opal material is potential to apply as the emerging sensing cyanide material.