The colloids of ZnO and WO 3 were synthesized and ZnO colloid with different mass fractions was added into the WO 3 colloid to get WO 3/ZnO composite colloids. The experimental results indicate that the UV-light color...The colloids of ZnO and WO 3 were synthesized and ZnO colloid with different mass fractions was added into the WO 3 colloid to get WO 3/ZnO composite colloids. The experimental results indicate that the UV-light coloration of WO 3 nanoparticles could be improved greatly after the addition of ZnO. When the molar ratio of ZnO to WO 3 is about 1∶100, the magnitude of the difference of absorbance(ΔOD) at 900 nm after and before the coloration for WO 3/ZnO colloids is as about 135 times as that of WO 3 colloids. The surface photovoltaic spectra show that the state density of the surface state of WO 3 increases greatly after the addition of ZnO, thus, under the UV-light irradiation more electrons from ZnO nanoparticles can be captured in the surface state and those electrons can be excited to a higher energy level, resulting in the improved coloration.展开更多
CdS nanoparticles were synthesized by using two complementary 2′ phosphorothioate oligo DNA, oligoG 10 SH and oligoC 10 SH as stabalizers. Because the thiol group was modified at phosphate site between C1 and C2 of 5...CdS nanoparticles were synthesized by using two complementary 2′ phosphorothioate oligo DNA, oligoG 10 SH and oligoC 10 SH as stabalizers. Because the thiol group was modified at phosphate site between C1 and C2 of 5′ end, the spatial exposure of DNA residue at C1 site was preponderant compating with the spatial exposure of the nanoparticles when the DNA renatured. The experimental result showed DNA renaturation ratio is about 50% and CdS nanoparticles were assembled into parallel quadrilateral array as the DNA renaturation progressed.展开更多
文摘The colloids of ZnO and WO 3 were synthesized and ZnO colloid with different mass fractions was added into the WO 3 colloid to get WO 3/ZnO composite colloids. The experimental results indicate that the UV-light coloration of WO 3 nanoparticles could be improved greatly after the addition of ZnO. When the molar ratio of ZnO to WO 3 is about 1∶100, the magnitude of the difference of absorbance(ΔOD) at 900 nm after and before the coloration for WO 3/ZnO colloids is as about 135 times as that of WO 3 colloids. The surface photovoltaic spectra show that the state density of the surface state of WO 3 increases greatly after the addition of ZnO, thus, under the UV-light irradiation more electrons from ZnO nanoparticles can be captured in the surface state and those electrons can be excited to a higher energy level, resulting in the improved coloration.
文摘CdS nanoparticles were synthesized by using two complementary 2′ phosphorothioate oligo DNA, oligoG 10 SH and oligoC 10 SH as stabalizers. Because the thiol group was modified at phosphate site between C1 and C2 of 5′ end, the spatial exposure of DNA residue at C1 site was preponderant compating with the spatial exposure of the nanoparticles when the DNA renatured. The experimental result showed DNA renaturation ratio is about 50% and CdS nanoparticles were assembled into parallel quadrilateral array as the DNA renaturation progressed.
