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Optical Properties of ZnFe2O4—SiO2 Granular Films Prepared by Radio—Frequency Magnetron Sputtering
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We report on the optical properties of ZnFe2O4-SiO2 granular films prepared on quartz substrates by the radio-frequency magnetron sputtering method.Post-annealing was performed at different temperatures under flow oxygen atmosphere.The morphology and Structures of ZnFe2O4 nanoparticles were characterized by x-ray different line types in the optical absorption curves of ZnFe2O4-SiO2 granular films.The critical transition of line types occurs when ZnFe2O4 changes from amorphous to crystalline,and the transition temperature increases with the increasing content of ZnFe2O4.There is an obvious blueshift of the optical absorption edge of the granular films with the decreasing annealing temperature. 相似文献
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Pulsed electrodeposited technique is applied to fabricate ZnTe nanowire arrays with different diameters into the anodic alumina membrane in citric acid solution. The x-ray powder diffraction, scanning electron microscopy and transmission electron microscopy indicate that the high ordered, uniform and single-crystalline nanowires have been fabricated. The optical absorption spectra of the nanowire array show that the optical absorption band edge of the ZnTe nanowire array exhibit a blue shift compared with that of bulk ZnTe, and the nonlinear current-voltage characteristic is observed. 相似文献
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Co-TiO2纳米复合材料及其组织性能研究 总被引:1,自引:0,他引:1
以钛酸丁脂及冰醋酸分别为先驱体和螯合剂,采用溶胶-凝胶法,通过水解缩聚作用制备多孔结构的TiO2基体,在孔隙中引入金属相粒子得到纳米金属陶瓷复合材料.通过实验,研究了不同组分的Co-TiO2纳米复合材料结构和组织随温度变化机理,确定了相变转变温度,并初步分析Co含量对组装体系磁学性能的影响. 相似文献
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研究了VO2(M)纳米棒的金属绝缘体相变(MIT)行为.在VO2(M)纳米棒的DSC分析曲线上发现了两个MIT,分别位于低温和高温区.低温MIT总是伴随出现VO2(B)纳米棒,而独立的高温MIT出现在纯VO2(M)纳米棒.分析和讨论了这两个MIT的机制. 相似文献
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电沉积二氧化钛功能薄膜的制备与组织转变研究 总被引:2,自引:0,他引:2
采用直流电沉积方法,在石墨板上成功制备了半导体二氧化钛功能薄膜前驱体,分析讨论了电沉积过程中实验参数对TiO2前驱体成膜的影响,获得了制备二氧化钛膜最佳工艺参数.TiO2前驱体沉积速率随着电流密度的增大而增加,为了保证薄膜质量,将电流密度控制在5~45mA/cm2之间;溶液浓度对沉积速率也有影响,当溶液中TiCl4:H2O2=1:2时沉积速率最大;最佳沉积温度为5-10℃.运用差热分析、XRD相结构分析和SEM等手段,研究了该前驱体到锐钛矿相(anatase)和金红石相(rutile)二氧化钛的组织相转变过程,300℃热处理得到锐钛矿相的二氧化钛,650℃热处理后出现金红石相. 相似文献