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221.
Tingting Zhang Zia Ur Rahman Ning Wei Yupeng Liu Jun Liang Daoai Wang 《Nano Research》2017,(3):1021-1032
Despite one-dimensional (1D) semiconductor nanostructure arrays attracting increasing attention due to their many advantages,highly ordered TiO2 nanorod arrays (TiO2 NR) are rarely grown in situ on Ti substrates.Herein,a feasible method to fabricate TiO2 NRs on Ti substrates by using a through-mask anodization process is reported.Self-ordered anodic aluminum oxide (AAO) overlaid on Ti substrate was used as a nanotemplate to induce the growth of TiO2 NRs.The NR length and diameter could be controlled by adjusting anodization parameters such as electrochemical anodization voltage,anodization time and temperature,and electrolyte composition.Furthermore,according to the proposed NR formation mechanism,the anodized Ti ions migrate and deposit in the AAO nanochannels to form Ti(OH)4 or amorphous TiO2 NRs under electric field,owing to the confinement effect of the template.Photoelectrochemical tests indicated that,after hydrogenation,the TiO2 NRs presented higher photocurrent density under simulated sunlight and visible light illuminations,suggesting their potential use in photoelectrochemical water splitting,photocatalysis,solar cells,and sensors. 相似文献
222.
利用MH-6型显微硬度仪和MGW-01高频往复式微动磨损试验机进行7A52装甲铝合金的显微硬度测试和微动磨损试验,分析不同取向表面显微硬度及微动磨损试验对显微硬度的影响。结果表明不同取向表面显微硬度基本相同,试验范围内微动磨损表面显微硬度比基体表面显微硬度增加。 相似文献
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以溶胶凝胶法制备的NaYF4前躯体干胶为模板,将干胶置于水热环境中进行反应制备NaYF4。通过X-射线衍射仪(XRD)检测可知样品中含有NaYFa,通过高分辨透射电子显微镜(HRTEM)对样品进行形貌表征发现,水热后的碳骨架上含有生成的纳米颗粒,并且在电镜下出现了晶格条纹,进一步证实生成了纳米颗粒为NaYF4。由于水热反应过程中柠檬酸三铵的脱水作用,纳米颗粒表面出现了许多孔洞。 相似文献
224.
The Ni, Fe, Co and Cu single and multilayer nanowire arrays to make perpendicular magnetic recording media were fabricated with nanoporous anodic aluminum oxide (AAO) templates from Watt solution and additives by the DC electrodeposition. The results show that the diameters of Ni, Fe, Co and Cu single and multilayer nanowires in AAO templates are 40–80 nm and the lengths are about 30 μm with the aspect ratio of 350–750. The magnetic properties of the prepared nanowires are different under different electrodepositing conditions. The remanences (Br) of Ni/Cu/Fe multilayer nanowires are lower than those of others multilayer nanowires, and coercivity (Hc) of Ni/Cu/Fe multilayer nanowires are lower than those of others multilayer nanowires. These are compatible with the required conditions of high density magnetic media devices that should have the low coercivity to easily success magnetization and high remanence to keep magnetization after removal of magnetic field. 相似文献
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We successfully fabricated a square pattern of anodic alumina oxide (AAO) template in thin Al film grown on Si substrate utilizing focused ion beam (FIB) milled indent. The pore size and its period of the square matrix were about 50 nm and 100 nm, respectively. We found that the minimum indented depth is required to satisfy the critical electric field which is a vertical component toward downward. In addition, we found that the anodizing voltage plays an important role in determining the pore shape and uniformity. The higher anodizing voltage not only reduces the minimum indent depth that is required to create a matrix array but also improves the uniformity of pore shapes in the matrix array. 相似文献