TiO2 nanofilms on surface of fused silica were fabricated by Ti ion implantation and subsequent thermal annealing in oxygen ambience. The silica glasses were implanted by 20 k V Ti ions to 1.5 × 1017ions/cm2 on a...TiO2 nanofilms on surface of fused silica were fabricated by Ti ion implantation and subsequent thermal annealing in oxygen ambience. The silica glasses were implanted by 20 k V Ti ions to 1.5 × 1017ions/cm2 on an implanter of metal vapor vacuum arc(MEVVA) ion source. Effects of annealing parameters on formation,growth and phase transformation of the TiO2 nanofilms were studied in detail. Optical absorption spectroscopy,Raman scattering spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy measurements were done to figure out formation mechanism of the TiO2 nanofilms.The formation of TiO2 nanofilms was due to out-diffusion of the implanted Ti ions to the substrate surface,where they were oxidized into TiO2 nanoparticles. Formation, phase, and thickness of the TiO2 nanofilms can be well tailored by controlling annealing parameters.展开更多
利用金属蒸发真空多弧离子源（MEVVA源）注入机,将Au离子注入到高纯石英玻璃衬底中来制备Au纳米颗粒,Au离子注入的加速电压分别为20、40和60 k V,注入剂量为1×1017ions/cm2,随后将注入样品在普通管式退火炉中700~1000℃退火处理。...利用金属蒸发真空多弧离子源（MEVVA源）注入机,将Au离子注入到高纯石英玻璃衬底中来制备Au纳米颗粒,Au离子注入的加速电压分别为20、40和60 k V,注入剂量为1×1017ions/cm2,随后将注入样品在普通管式退火炉中700~1000℃退火处理。研究了注入条件和热退火参数对Au纳米颗粒的形成、生长、分布以及光学性能的影响。采用光学吸收谱、扫描电子显微镜和透射电子显微镜对注入样品的光学性能、表面形貌和微观结构进行了测试和表征。实验结果表明,采用该低压离子注入结合热退火工艺的方法,所制备的Au纳米颗粒具有很强的局域表面等离子体共振特性,同时该方法也为制备尺寸和分布可控的Au纳米颗粒提供了一些新的参考途径。展开更多
The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si(111) substrates by radio frequency(RF) magnetron sputtering technique. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) indicate that t...The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si(111) substrates by radio frequency(RF) magnetron sputtering technique. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) indicate that the Ca atoms enter the LiNbO3 lattice in the form of Ca2+ ions. Superconducting quantum interference device(SQUID) results show that the Ca-doped LiNbO3 films have room-temperature ferromagnetism and a maximum saturation magnetization of 4800 A/m at the 3% of Ca atom doping concentration. The room temperature ferromagnetism of the Ca-doped LiNbO3 films can be attributed to the occurrence of vacancies due to Ca doping and is the intrinsic property.展开更多
基金Supported by National Natural Science Foundation of China(No.11405280)Foundation from Education Department of Henan Province(No.14B140021)the Startup Foundation for Doctors of Zhoukou Normal University(No.zksybscx201210)
文摘TiO2 nanofilms on surface of fused silica were fabricated by Ti ion implantation and subsequent thermal annealing in oxygen ambience. The silica glasses were implanted by 20 k V Ti ions to 1.5 × 1017ions/cm2 on an implanter of metal vapor vacuum arc(MEVVA) ion source. Effects of annealing parameters on formation,growth and phase transformation of the TiO2 nanofilms were studied in detail. Optical absorption spectroscopy,Raman scattering spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy measurements were done to figure out formation mechanism of the TiO2 nanofilms.The formation of TiO2 nanofilms was due to out-diffusion of the implanted Ti ions to the substrate surface,where they were oxidized into TiO2 nanoparticles. Formation, phase, and thickness of the TiO2 nanofilms can be well tailored by controlling annealing parameters.
文摘利用金属蒸发真空多弧离子源（MEVVA源）注入机,将Au离子注入到高纯石英玻璃衬底中来制备Au纳米颗粒,Au离子注入的加速电压分别为20、40和60 k V,注入剂量为1×1017ions/cm2,随后将注入样品在普通管式退火炉中700~1000℃退火处理。研究了注入条件和热退火参数对Au纳米颗粒的形成、生长、分布以及光学性能的影响。采用光学吸收谱、扫描电子显微镜和透射电子显微镜对注入样品的光学性能、表面形貌和微观结构进行了测试和表征。实验结果表明,采用该低压离子注入结合热退火工艺的方法,所制备的Au纳米颗粒具有很强的局域表面等离子体共振特性,同时该方法也为制备尺寸和分布可控的Au纳米颗粒提供了一些新的参考途径。
基金supported by the National Natural Science Foundation of China(Nos.11174217 and 10904110)
文摘The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si(111) substrates by radio frequency(RF) magnetron sputtering technique. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) indicate that the Ca atoms enter the LiNbO3 lattice in the form of Ca2+ ions. Superconducting quantum interference device(SQUID) results show that the Ca-doped LiNbO3 films have room-temperature ferromagnetism and a maximum saturation magnetization of 4800 A/m at the 3% of Ca atom doping concentration. The room temperature ferromagnetism of the Ca-doped LiNbO3 films can be attributed to the occurrence of vacancies due to Ca doping and is the intrinsic property.
