A series of naphthylmethyl polyethylenepolyamine have been synthesized in this work.Its complexation with zinc salts in different solvents and the type of formation of the complex were investigated by means of fluores...A series of naphthylmethyl polyethylenepolyamine have been synthesized in this work.Its complexation with zinc salts in different solvents and the type of formation of the complex were investigated by means of fluorescence spectra.The results showed that naphthylmethyl polyethylenepolyamine is a good fluorescence chemical sensor for the testing of foreign zinc ion.A 1:2 stoichiometric complex was found in the solution of compound 3 with zinc acetate.But a 1:1 complex was formed when it reacted with zinc chloride in solution. An obvious excimer emission could be observed in the fluorescence spectrum of compound 3 with zinc chloride.展开更多
In the present work, we prepared two kinds of quantum sized ZnO particles whose size were 3 nm(P1) and 5 nm(P2), respectively, and studied their surface properties with surface photovoltage spectroscopy(SPS) and elect...In the present work, we prepared two kinds of quantum sized ZnO particles whose size were 3 nm(P1) and 5 nm(P2), respectively, and studied their surface properties with surface photovoltage spectroscopy(SPS) and electric field induced surface photovoltage spectroscopy(EFISPS). The photovoltaic response of the two samples showed opposite dependence on external electric field. And when electric field was applied, the thresholds of photovoltaic response of the two samples were all red shifted. The results showed that the surface properties of P1 were different from those of P2, because of their different preparation process. We assigned that basic zinc acetate structure exist on the surface of P1 sample. While for P2 sample prepared by aging P1, that kind of surface structure disappeared, but the particles might be doped with lithium ions in the aging process.展开更多
TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It...TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It was found that treatment by TiCl4 plasma enhanced the amount of Ti3+ suiface state and Ti dislocation of the film, detected by the surface photovoltage spectroscopy, while O2 plasma surface treating enhanced its amount of O2 surface state. It was also indicated by the H2O adsorption experiment that film treated by O2 plasma had larger separation efficiency for photogenerated carriers than the one treated by TiCl4 plasma.展开更多
A new photochromic complex of Keggin type Tungstophosphate acid/polyacrylamide system was prepared in aqueous solution, and its thin films was made by the dip coating technique. Their properties were investigated by F...A new photochromic complex of Keggin type Tungstophosphate acid/polyacrylamide system was prepared in aqueous solution, and its thin films was made by the dip coating technique. Their properties were investigated by FT IR, UV Vis, as well as TG DTA measurement. The results showed that this type of system had different properties in solution and in thin films. ESR spectra g values for the one electron blues were the characteristic of tetragonal W 5+ complex in aqueous solution and thin films. The formation of a radical signal of ESR spectra indicated that polyacrylamide was a proton donor, the reversibility for photochromism was relative to the presence and diffusion of oxygen in polymeric network.展开更多
文摘A series of naphthylmethyl polyethylenepolyamine have been synthesized in this work.Its complexation with zinc salts in different solvents and the type of formation of the complex were investigated by means of fluorescence spectra.The results showed that naphthylmethyl polyethylenepolyamine is a good fluorescence chemical sensor for the testing of foreign zinc ion.A 1:2 stoichiometric complex was found in the solution of compound 3 with zinc acetate.But a 1:1 complex was formed when it reacted with zinc chloride in solution. An obvious excimer emission could be observed in the fluorescence spectrum of compound 3 with zinc chloride.
文摘In the present work, we prepared two kinds of quantum sized ZnO particles whose size were 3 nm(P1) and 5 nm(P2), respectively, and studied their surface properties with surface photovoltage spectroscopy(SPS) and electric field induced surface photovoltage spectroscopy(EFISPS). The photovoltaic response of the two samples showed opposite dependence on external electric field. And when electric field was applied, the thresholds of photovoltaic response of the two samples were all red shifted. The results showed that the surface properties of P1 were different from those of P2, because of their different preparation process. We assigned that basic zinc acetate structure exist on the surface of P1 sample. While for P2 sample prepared by aging P1, that kind of surface structure disappeared, but the particles might be doped with lithium ions in the aging process.
文摘TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It was found that treatment by TiCl4 plasma enhanced the amount of Ti3+ suiface state and Ti dislocation of the film, detected by the surface photovoltage spectroscopy, while O2 plasma surface treating enhanced its amount of O2 surface state. It was also indicated by the H2O adsorption experiment that film treated by O2 plasma had larger separation efficiency for photogenerated carriers than the one treated by TiCl4 plasma.
文摘A new photochromic complex of Keggin type Tungstophosphate acid/polyacrylamide system was prepared in aqueous solution, and its thin films was made by the dip coating technique. Their properties were investigated by FT IR, UV Vis, as well as TG DTA measurement. The results showed that this type of system had different properties in solution and in thin films. ESR spectra g values for the one electron blues were the characteristic of tetragonal W 5+ complex in aqueous solution and thin films. The formation of a radical signal of ESR spectra indicated that polyacrylamide was a proton donor, the reversibility for photochromism was relative to the presence and diffusion of oxygen in polymeric network.
