ZnO nanorods were synthesized using the sol-gel method, and the effects of annealing temperature and Ce doping on the morphologies and optical properties of ZnO nanostructures were investigated in detail. The XRD meas...ZnO nanorods were synthesized using the sol-gel method, and the effects of annealing temperature and Ce doping on the morphologies and optical properties of ZnO nanostructures were investigated in detail. The XRD measurements showed that the as-synthesized ZnO nanostructures had a hexagonal wurtzite structure. SEM images showed that uniform nanorods formed at 900 °C. Photoluminescence measurements showed an ultraviolet emission peak and a relatively broad visible light emission peak for the samples sintered at different temperatures. The UV emission peak bathochromically shifted when the annealing temperature rose from 850 to 1000 °C. Ce doping decreased the synthesized temperature of the ZnO nanorods to 500 °C, and the UV peaks hypsochromically shifted.展开更多
Copper-doped ZnO nanoparticles were synthesized by the sol-gel method.The X-ray diffraction（XRD） result shows that Zn1-xCuxO（x≤0.04） samples are single phase with ZnO-like wurtzite structure,while the secondary p...Copper-doped ZnO nanoparticles were synthesized by the sol-gel method.The X-ray diffraction（XRD） result shows that Zn1-xCuxO（x≤0.04） samples are single phase with ZnO-like wurtzite structure,while the secondary phase Cu is observed in a Zn0.95Cu0.05O sample.Magnetic measurements indicate that Zn1-xCuxO（x≤0.04） samples are ferromagnetic at room temperature.A strong green peak（520 nm） was observed except for UV band peak in photoluminescent（PL） spectrum of Zn0.98Cu0.02O.展开更多
文摘为探明工业纯钛TA2在热带海域中的腐蚀与污损,在南海三亚海洋环境试验站进行了为期0.5年、1年、2年、3.5年四个周期的全浸试验。对 3.5年周期的试验样品,利用解剖镜鉴定了生物污损群落的组成、利用金相显微镜观察、X射线衍射、扫描电子显微镜(scanning electron microscopy,SEM)及红外光谱分析技术分析了基体和腐蚀产物的微观形貌,确定了钛板表面的元素和产物。结果表明,钛板表面由基底的二氧化钛膜、管栖多毛类、微藻等的微型生物和有机、无机颗粒组成的腐蚀产物皮膜所覆盖。和同纬度热带海域相比生物污损轻微,试板上(可视生物)仅有 3~5个而且种类少、数量少、个体小。钛板基体表面未发生局部腐蚀。
基金the National Natural Science Foundation of China(No.60778040)the Hi-tech Research and Development Program of China(No.2007AA032400448)+3 种基金the Science and Technology Bureau of Jilin Province(No.20060518)Gifted Youth Program of Jilin Province(No.20060123)the Science and Technology Office of Education of Jilin Province(No.2007162)the Science and Technology Bureau of Key Program for Ministry of Education(No.207025).
文摘ZnO nanorods were synthesized using the sol-gel method, and the effects of annealing temperature and Ce doping on the morphologies and optical properties of ZnO nanostructures were investigated in detail. The XRD measurements showed that the as-synthesized ZnO nanostructures had a hexagonal wurtzite structure. SEM images showed that uniform nanorods formed at 900 °C. Photoluminescence measurements showed an ultraviolet emission peak and a relatively broad visible light emission peak for the samples sintered at different temperatures. The UV emission peak bathochromically shifted when the annealing temperature rose from 850 to 1000 °C. Ce doping decreased the synthesized temperature of the ZnO nanorods to 500 °C, and the UV peaks hypsochromically shifted.
基金Supported by the National Natural Science Foundation of China(No.60778040)the Science and Technology Program of "11th Five-Year" of Education for Jilin Province,China(Nos.20070161,20070162)
文摘Copper-doped ZnO nanoparticles were synthesized by the sol-gel method.The X-ray diffraction（XRD） result shows that Zn1-xCuxO（x≤0.04） samples are single phase with ZnO-like wurtzite structure,while the secondary phase Cu is observed in a Zn0.95Cu0.05O sample.Magnetic measurements indicate that Zn1-xCuxO（x≤0.04） samples are ferromagnetic at room temperature.A strong green peak（520 nm） was observed except for UV band peak in photoluminescent（PL） spectrum of Zn0.98Cu0.02O.
