磁控溅射制备微球表面金属Mo涂层的研究

利用磁控溅射制备了各种工艺参数不同的微球表面金属Mo涂层样品,并通过白光干涉仪和扫描电子显微镜对样品的表面及剖面进行了系统的测试分析。分别探究了溅射工作气压和沉积制备时间对微球表面Mo涂层表面形貌以及结晶质量的影响规律。结果表明通过优化工艺参数可制备微球直径约为800μm、涂层厚度为3.5μm到14.1μm、厚度均匀性良好的微球表面Mo涂层。Mo涂层中的晶粒呈现出柱状结构致密堆积在一起,且随涂层的厚度增加晶粒间空隙增大。     

Nanoscaled ZnO films used as enhanced substrates for fluorescence detection of dyes

The ability of nanoscaled ZnO films to enhance fluorescence was studied.We found that the fluorescence intensities of Cy5,rhodamine 6G,and fluorescein can be enhanced about 10-fold on nanoscaled ZnO films as compared to that on glass substrates.The lifetimes of all samples were measured,and no obvious change in lifetime was observed for dyes on different substrates.The mechanism for the nanoscaled ZnO film enhanced fluorescence appears to be different from that for the metal-fluorophore systems.     

Preparation and characterization of nontoxic magnetic-luminescent nanoprobe

A novel nontoxic,magnetic,and luminescent nanoprobe is prepared by using complex nanoparticles,which are composed of Fe3O4 nanoparticles and Mn-doped ZnS quantum dots(QDs).The nanocomposite probe can provide visible optical and magnetic resonance images simultaneously.Compared with the previously toxic cadmium and mercury based QDs,the superiority of the Mn-doped ZnS QDs is little virulence.The structure and the properties of the particles are characterized by energy dispersive X-ray analysis spectroscopy,X-ray photoelectron spectroscopy,transmission electron microscopy,photoluminescence spectroscopy,and vibrating sample magnetometer.     

Nanoscaled ZnO films used as enhanced substrates for fluorescence detection of dyes

The ability of nanoscaled ZnO films to enhance fluorescence was studied. We found that the fluorescence intensities of Cy5, rhodamine 6G, and fluorescein can be enhanced about 10-fold on nanoscaled ZnO films as compared to that on glass substrates. The lifetimes of all samples were measured, and no obvious change in lifetime was observed for dyes on different substrates. The mechanism for the nanoscaled ZnO film enhanced fluorescence appears to be different from that for the metal-fluorophore systems.     

尺寸可控的纳米硅的生长模型和实验验证

基于经典热力学理论，对a-SiN_x/a-Si:H/a-SiN_x三明治结构或a-Si:H/a-SiN_x多层膜结构中纳米硅成核，以及从球形到鼓形的生长过程进行了研究. 建立了限制性晶化理论模型：在纳米硅生长过程中，由于界面能增大将导致生长停止，给出限制性晶化条件——a-Si:H子层厚度小于34 nm. 在激光晶化和常规热退火两种方法形成的a-SiN_x/nc-Si/a-SiN_x三明治结构和nc-Si/a-SiN_x多层膜结构中验证了该理论模型. 关键词： 非晶硅 纳米硅 激光辐照 结晶     

Superhydrophobic surfaces via controlling the morphology of ZnO micro/nano complex structure

ZnO micro/nano complex structure films, including reticulate papillary nodes, petal-like and flake-hole, have been self-assembled by a hydrothermal technique at different temperatures without metal catalysts. The wettability of the above film surfaces was modified with a simple coating of heptadecafluorodecyltrimethoxy-silane in toluene. After modifying, the surface of ZnO film grown at 50~${^\circ}$C was converted from superhydrophilic with a water contact angle lower than 5$^{\circ}$ to superhydrophobic with a water contact angle of 165$^{\circ}$. Additionally, the surface of reticulate papillary nodes ZnO film grown at 100~${^\circ}$C had excellent superhydrophobicity, with a water contact angle of 173$^{\circ}$ and a sliding angle lower than 2$^{\circ}$. Furthermore, the water contact angle on the surface of petal-like and flake-hole ZnO films grown at 150~${^\circ}$C and 200~${^\circ}$C were found to be 140$^{\circ}$ and 120$^{\circ}$, respectively. The wettability for the samples was found to depend strongly on the surface morphology which results from the growth temperature.     

Structure,phase evolution and properties of Ta films deposited using hybrid high-power pulsed and DC magnetron co-sputtering

Crystalline phase and microstructure control are critical for obtaining desired properties of Ta films deposited by magnetron sputtering. Structure, phase evolution and properties of Ta films deposited by using hybrid high power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (DCMS) under different fractions of DCMS power were investigated, where Ta ion to Ta neutral ratios of the deposition flux were changed. The results revealed that the number of Ta ions arriving on the substrate/growing film plays an important role in structure and phase evolution of Ta films. It can effectively avoid the unstable arc discharge under low pressure and show a higher deposition rate by combining HiPIMS and DCMS compared with only HiPIMS. Meanwhile, the high hardness α -Ta films can be directly deposited by hybrid co-sputtering compared to those prepared by DCMS. In the co-sputtering technology, pure α -Ta phase films with extremely fine, dense and uniform crystal grains were obtained, which showed smooth surface roughness (3.22 nm), low resistivity (38.98 μΩ · cm) and abnormal high hardness (17.64 GPa).     

GDP/D-GDP化学结构与力学性能的研究

利用低压等离子体增强化学气相沉积技术制备碳氢辉光放电聚合物(GDP)和全氘代辉光放电聚合物(D-GDP)薄膜。利用表面轮廓仪、傅里叶红外光谱仪和纳米压痕技术对制备的样品进行表征,讨论了GDP/D-GDP薄膜的沉积速率、化学结构和力学性能在ICF物理实验用靶应用中的优缺点。结果表明:GDP/D-GDP薄膜的沉积速率都随反应气体流量比例近线性增加,GDP的沉积速率达到2.6μm,D-GDP的沉积速率达到1μm,GDP的沉积速率远大于D-GDP的沉积速率;D-GDP薄膜内部的交联化程度较弱,D-GDP更有利于靶丸内燃料的红外均化;GDP的力学性能明显优于D-GDP,更有利于ICF物理实验用靶的燃料填充与装配操作。     

Wettability and formation mechanism of ZnO micro-spheres composed film

This paper reports that the film composed of flower-like ZnO micro-spheres, which consists of nano-sheets, is fabricated by chemical bath deposition. By adding hydrogen fluoride (HF) into the reaction solution, which contains zinc nitrate hexahydrate and hexamethylenetetramine, the ZnO crystal growth process is changed and the film composed by ZnO micro-spheres is obtained after keeping the reaction solution at 95 oC for 2 h. The morphology, crystal phase and wettability of the sample are characterized by scanning electron microscope, x-ray diffraction and contact angle meter, respectively. The results show that the film has the micro-nano compound structure. After modification with heptadecafluorodecyltrimethoxy-silane, the wettability of the film changed from superhydrophilicity to superhydrophobicity, on which water contact angle and the sliding angle are 154o and less than 5o for 8-μL water droplet, respectively. Additionally, the formation mechanism of the ZnO micro-sphere is also discussed.