NSOM中石英音叉控制探针—样品间距的机制

建立了音叉－探针－样品系统机械振动方程和电子学振荡方程，并得到其振动特性的解析表达式，进一步得到等效电路的电子学特性，进而系统分析了压电石英音叉的控制探针与样品（T－S）间距离的作用机制及其机电特性。为探针－样品间距控制方法提供了依据。     

多晶硅衬底上的RF MEMS开关

在微机械开关与硅IC工艺设计和兼容方面进行了改进,获得了一种可与IC工艺兼容的RFMEMS微机械开关.采用介质隔离工艺技术把这种RFMEMS微机械开关制作在绝缘的多晶硅衬底上,实现了与IC工艺兼容;采用在金属膜桥的端点附近刻蚀一些孔的优化方法,降低了RFMEMS微机械开关的下拉电压.用TE2 819电容测试设备测试开关的电容,测得开关的开态电容、关态电容和致动电压分别为0 32 pF、6 pF和2 5V .用HP875 3C网络分析仪对RFMEMS微机械开关进行了RF特性测试,得出RFMEMS微机械开关在频率1 5GHz下关态的隔离度为35dB ,开态的插入损耗为2dB ,用示波器测得该开关的开关     

集成式五维微力/力矩传感器的研究

五维微力 /力矩传感器应用于微装配机器人操作末端的微力觉感知 ,能够同时测量三个方向的微力Fx、Fy、Fz 和两个方向的微力矩Mx 和My;测力量程± 1N ,测力矩量程± 0 .0 5N·m ;放大电路集成在传感器的本体中。应用力学理论对本体进行理论分析 ,推导出计算公式 ,求出本体的应变 ;并采用有限元分析软件进行仿真 ,分析应变 ,确定了一种适用的静态非线性标定方法     

光场力对烧蚀物时空分布的影响

对烧蚀物的时空分布进行了研究。烧蚀物离开靶材表面时的速率分布由蒸发机制决定,在激光作用时间内烧蚀物的传输行为由扩散机制和光场力机制共同决定,激光作用结束后烧蚀物的传输行为由扩散机制单独决定,并解释了烧蚀物的时空分布及烧蚀物趋光运动的现象。     

ZnO growth on Si with low-temperature CdO and ZnO buffer layers by molecular-beam epitaxy

Low-temperature (LT) buffer-layer techniques were employed to improve the crystalline quality of ZnO films grown by molecular-beam epitaxy (MBE). Photoluminescence (PL) spectra show that CdO, as a hetero-buffer layer with a rock-salt structure, does not improve the quality of ZnO film grown on top. However, by using ZnO as a homo-buffer layer, the crystalline quality can be greatly enhanced, as indicated by PL, atomic force microscopy (AFM), x-ray diffraction (XRD), and Raman scattering. Moreover, the buffer layer grown at 450°C is found to be the best template to further improve the quality of top ZnO film. The mechanisms behind this result are the strong interactions between point defects and threading dislocations in the ZnO buffer layer.     

High Tc Superconductor Theoretical Models and Electromagnetic Flux Characteristics

High Tc Superconductors (HTS) have special electromagnetic characteristics and phenomena. Effort has been made in order to theoretically understand the applied HTS superconductivity and HTS behaviors for practical applications, various theoretical models related to the HTS electromagnetic properties have been developed. The theoretical models and analytic methods are summarized with regard to understanding the HTS magnetic flux characteristic which is one of the most critical issues related to HTS applications such as for HTS magnetic levitation application.     

Thermoacoustic Emission from Carbon Nanotubes Imaged by Atomic Force Microscopy

The thermoacoustic effect of isolated single‐wall carbon nanotubes aligned between electrodes is experimentally observed for the first time by imaging the emitted acoustic wave using an atomic force microscopy‐based technique specifically developed for the task. The capability of such a technique for single‐point thermoacoustic measurements is first verified on carbon nanotubes layers with two electrodes for injecting alternate electric current. The technique is then demonstrated to allow the acquisition, simultaneously with the topography, of images reflecting the pressure of the acoustic wave at fixed distance from the sample. Such a capability is used to collect images reflecting the amplitude of acoustic waves generated by isolated nanotubes and nanotube bundles by the thermoacoustic effect.     

CO2激光诱导条件下的金属沉积层的微观分析

为了研究低功率CO2激光诱导条件下,从水性溶液中诱导金属沉积机理,利用动态力显微镜分析了金属Ag过程中的晶粒分布以及晶体生长概貌;利用电子探针研究了金属沉积层在环氧树脂表面的横向和纵向沉积现象;利用X射线衍射方法研究了Ag-Cu沉积层中的Cu晶体生长过程中晶格常数的变化。结果表明,Ag晶粒在基材表面的沉积规律、生长分布与工艺参量以及激光模式有密切关系;金属微粒在环氧树脂表面的横向沉积,直接影响金属层的宽度,而其纵向沉积直接决定金属层的厚度;同Cu相比,Ag-Cu层也在(111),(200),(220)3个晶面衍射强度较大,但点阵常数α有微小变化,说明在沉积过程中有少量的杂质原子渗透到Cu金属层。     

The trapping,detrapping, and transport of the ambipolar charges in the electret of Polystyrene/C60 blend films

The electrons and holes were injected into the blend electrets of polystyrene and C₆₀ (PS/C₆₀) by adjusting the biases of conductive atomic force microscopy probe. We visualized the charges trapping, release, diffusion, and retention processes of the PS/C₆₀ electrets by utilizing the Kelvin Probe Force Microscopy (KPFM), and found that the localization and retention abilities of the ambipolar charges are enhanced with the increase of C₆₀ content, indicating that blending C₆₀ in PS matrix is a promising method for the charge trapping layer in transistor memory devices. Furthermore, we discussed the storage and diffusion mechanisms, and speculated that the interface of C₆₀ and PS in the blend electrets and repulsive force between charge clusters around C₆₀ are the important factors for the novel storage effect of the blend electret.     

具有柔性铰链的差式微位移放大机构的受力分析

通过对差式微位移放大机构的分解简化,应用叠加的方法推导出了形式上比较易于求解的机构放大倍数的计算公式。该公式的计算结果与有限元法的计算结果比较接近,可用于类似机构的设计计算。