Low-dimensional Bi_(2)Fe_(4)O_(9)nanosheets and microrods have been selectively prepared by a solvothermal method,from which the growth of the Bi_(2)Fe_(4)O_(9)crystals can be controlled by the variation of reaction c...Low-dimensional Bi_(2)Fe_(4)O_(9)nanosheets and microrods have been selectively prepared by a solvothermal method,from which the growth of the Bi_(2)Fe_(4)O_(9)crystals can be controlled by the variation of reaction conditions.Structure determination showed that the nanosheets are mainly exposed by{001}facets while the microrods are exposed by{110}facets.Ab-sorption spectra revealed that there are two bandgaps observed for both nanosheets(at 1.9 and 1.55 eV)and microrods(1.7 and 1.45 eV),and they both would be available for the sunlight photocatalysis e ciently due to the intensive absorption ability in a wide region.Photocatalytic investigation demonstrated that the overall photocatalytic performance of the microrods is prior to that of the nanosheets due to the variation of bandgaps and exposed facets.The present report provides a useful alternative strategy for the controlling growth of nanostructures and/or microcrystals besides the present demonstration of the Bi_(2)Fe_(4)O_(9)crystals with diflerent bandgaps and facets that would be able to tune the corresponding photocatalytic ability selectively.展开更多
A facile and general route to a new generation of polyaniline （PANI）-citric acid （CA） crystals such as 2D nanoplates, 2D nanosheets and 3D microrods self-assembled by the n-n stacking interaction is reported. Dram...A facile and general route to a new generation of polyaniline （PANI）-citric acid （CA） crystals such as 2D nanoplates, 2D nanosheets and 3D microrods self-assembled by the n-n stacking interaction is reported. Dramatic, 3D rectangular shaped microrods and 2D nanosheets are single crystals indicated by SAED patterns and HRTEM images. Moreover, the method does not depend on any specific equipment or heating, cooling and complex procedures. The novel polyaniline crystals will be useful for next generation organic electronics such as nano-transistors.展开更多
Cyclic voltammetry and chronopotentiometry have been used to study the Sb-doped Ti/SnO2 anodes prepared by magnetron sputtering. The results showed that magnetron sputtering condition influenced the surface morphology...Cyclic voltammetry and chronopotentiometry have been used to study the Sb-doped Ti/SnO2 anodes prepared by magnetron sputtering. The results showed that magnetron sputtering condition influenced the surface morphology and the properties of the anodes. After the Ti substrate was tempered in Ar at 600 ℃ for 1 h, Till1.5 on the surface generated from the acid etching was replaced by needle-like TiO2. The SnO2 coating on the above Ti substrate by magnetron sputtering with post-annealing was comprised of microrod and different with the traditional Ti/ SnO2 anode. The accelerated service life test showed that the microrod SnO2 anode gained the longest service time. The anode exhibited oscillations in the chronopotentiometry curves, and the microrod SnO2 coating almost dissolved after the life test. A model of layer-by-layer degradation mechanism for the anode was proposed.展开更多
基金supported by the National Natural Science Foundation of China(No.21571166 and No.51271173)the National Basic Research Program of China(No.2012CB922001)
文摘Low-dimensional Bi_(2)Fe_(4)O_(9)nanosheets and microrods have been selectively prepared by a solvothermal method,from which the growth of the Bi_(2)Fe_(4)O_(9)crystals can be controlled by the variation of reaction conditions.Structure determination showed that the nanosheets are mainly exposed by{001}facets while the microrods are exposed by{110}facets.Ab-sorption spectra revealed that there are two bandgaps observed for both nanosheets(at 1.9 and 1.55 eV)and microrods(1.7 and 1.45 eV),and they both would be available for the sunlight photocatalysis e ciently due to the intensive absorption ability in a wide region.Photocatalytic investigation demonstrated that the overall photocatalytic performance of the microrods is prior to that of the nanosheets due to the variation of bandgaps and exposed facets.The present report provides a useful alternative strategy for the controlling growth of nanostructures and/or microcrystals besides the present demonstration of the Bi_(2)Fe_(4)O_(9)crystals with diflerent bandgaps and facets that would be able to tune the corresponding photocatalytic ability selectively.
文摘A facile and general route to a new generation of polyaniline （PANI）-citric acid （CA） crystals such as 2D nanoplates, 2D nanosheets and 3D microrods self-assembled by the n-n stacking interaction is reported. Dramatic, 3D rectangular shaped microrods and 2D nanosheets are single crystals indicated by SAED patterns and HRTEM images. Moreover, the method does not depend on any specific equipment or heating, cooling and complex procedures. The novel polyaniline crystals will be useful for next generation organic electronics such as nano-transistors.
文摘Cyclic voltammetry and chronopotentiometry have been used to study the Sb-doped Ti/SnO2 anodes prepared by magnetron sputtering. The results showed that magnetron sputtering condition influenced the surface morphology and the properties of the anodes. After the Ti substrate was tempered in Ar at 600 ℃ for 1 h, Till1.5 on the surface generated from the acid etching was replaced by needle-like TiO2. The SnO2 coating on the above Ti substrate by magnetron sputtering with post-annealing was comprised of microrod and different with the traditional Ti/ SnO2 anode. The accelerated service life test showed that the microrod SnO2 anode gained the longest service time. The anode exhibited oscillations in the chronopotentiometry curves, and the microrod SnO2 coating almost dissolved after the life test. A model of layer-by-layer degradation mechanism for the anode was proposed.
