Full conjugated multilayer thin films fabricated by the alternate adsor ption of partially doped polyaniline (PANI) as a polycation and water-soluble p o ly(4-carboxyphenyl)acetylene (PA) as a polyanion were used as n...Full conjugated multilayer thin films fabricated by the alternate adsor ption of partially doped polyaniline (PANI) as a polycation and water-soluble p o ly(4-carboxyphenyl)acetylene (PA) as a polyanion were used as nanoreactors to s t udy the in situ preparation of PbS nanoparticles.First,the self-assembled mu ltilayers were immersed in a 1 mol/L NaOH solution to fabricate a controlled con tent of free carboxylic acid binding groups.Chemical reaction within the polyme r film was initiated by absorbing Pb 2+ from a 0 4 mol/L aqueous solutio n of Pb(Ac) 2 and followed by exposing the film to H 2S gas.UV-Vis absorp tion studies re veal that the absorption spectral profiles of the films are dependent on the dip ping time of the film in the Pb(Ac) 2 solution.AFM and TEM microscopic examina tions o f the films reveal that PbS crystals with rhomboid structures are formed in the films.The particles of narrow size distribution stand vertically on the fil m plane.Due to being doped by PbS,the photoelectric conversion property of ultra-thin composite films,which can be measured with a conventional three-e lectrod e photoelectrochemical cell using 0 5 mol/L KCl solution as the supporting elec tr olyte,is improved obviously.The results show that the value of the photocurren t for an 8\|layer film is 3 times higher than that of the original film.展开更多
The nanometer cobalt blue pigments were prepared by microemulsion method. Using dynamic light scattering(DLS) test method, the influences of water content on the size of liquid drop of microemulsion and the liquid dro...The nanometer cobalt blue pigments were prepared by microemulsion method. Using dynamic light scattering(DLS) test method, the influences of water content on the size of liquid drop of microemulsion and the liquid drop of microemulsion on the final diameter of nanometer particle were studied in the course of preparation. Accordingly, the method to control the diameter of nanometer particle by changing water content was established. The nanometer cobalt blue particles were confirmed by XRD and TEM. Color parameters of pigments were determined. The quantum size effect of the pigments was discussed.展开更多
文摘Full conjugated multilayer thin films fabricated by the alternate adsor ption of partially doped polyaniline (PANI) as a polycation and water-soluble p o ly(4-carboxyphenyl)acetylene (PA) as a polyanion were used as nanoreactors to s t udy the in situ preparation of PbS nanoparticles.First,the self-assembled mu ltilayers were immersed in a 1 mol/L NaOH solution to fabricate a controlled con tent of free carboxylic acid binding groups.Chemical reaction within the polyme r film was initiated by absorbing Pb 2+ from a 0 4 mol/L aqueous solutio n of Pb(Ac) 2 and followed by exposing the film to H 2S gas.UV-Vis absorp tion studies re veal that the absorption spectral profiles of the films are dependent on the dip ping time of the film in the Pb(Ac) 2 solution.AFM and TEM microscopic examina tions o f the films reveal that PbS crystals with rhomboid structures are formed in the films.The particles of narrow size distribution stand vertically on the fil m plane.Due to being doped by PbS,the photoelectric conversion property of ultra-thin composite films,which can be measured with a conventional three-e lectrod e photoelectrochemical cell using 0 5 mol/L KCl solution as the supporting elec tr olyte,is improved obviously.The results show that the value of the photocurren t for an 8\|layer film is 3 times higher than that of the original film.
文摘The nanometer cobalt blue pigments were prepared by microemulsion method. Using dynamic light scattering(DLS) test method, the influences of water content on the size of liquid drop of microemulsion and the liquid drop of microemulsion on the final diameter of nanometer particle were studied in the course of preparation. Accordingly, the method to control the diameter of nanometer particle by changing water content was established. The nanometer cobalt blue particles were confirmed by XRD and TEM. Color parameters of pigments were determined. The quantum size effect of the pigments was discussed.
