共查询到19条相似文献,搜索用时 165 毫秒
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基于隧道电流检测方式的原子力显微镜纳米检测系统设计 总被引:2,自引:0,他引:2
原子力显微镜(AFM)是当前进行材料表面微观形貌观察及分析的强有力工具之一。本文主要介绍一种隧道显微镜(STM)检测方式的原子力显微镜纳米检测系统(AFM.IPC-208B),该AFM系统设计是在STM.IPC-205B系统设计的基础上,采用隧道电流工作方式,将STM与AFM功能组合兼容。文章详细阐述了AFM.IPC-208B系统的设计原理、镜体、扫描控制以及数据采集。新设计的AFM.IPC-208B系统仍具有0.1nm的分辨率,检测范围为0~2mm×2mm,系统操作简易,工作效率高,与原STM.IPC-205B系统兼容,工作性能稳定可靠。 相似文献
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激光原子力显微镜及其对光学表面粗糙度的研究 总被引:1,自引:1,他引:0
自一九八五年,Binnig与斯坦福大学的Quate和IBM公司苏黎士实验室的Christoph合作推出了世界上第一台原子力显微镜(简称AFM)以来,AFM的研究及应用迅速扩展。它不仅象扫描隧道显微镜那样能从原子尺度上对导体、半导体表面而且还能对非导体的表面进行成像,拓宽了STM的应用范围。 相似文献
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开尔文探针力显微镜(KPFM)是一种可以对材料表面电势进行纳米级成像的工具,是研究纳米材料表面特性的一种重要手段。高定向热解石墨(HOPG)具有表面光滑、导电性好的特点,在原子力显微镜(AFM)的KPFM模式下,向HOPG表面施加不同电压,测量HOPG的表面电势,以结果作为参照,采用控制变量法分别对比了滤波器阶数、灵敏度和驱动值三种参数对表面电势测量的影响。实验结果表明:滤波器阶数、灵敏度和驱动值均对表面电势的测量有不同程度的影响,不同程度增加滤波器阶数、灵敏度和驱动值都可以起到提升信噪比的作用,其中灵敏度的提升对信号的影响最为显著。 相似文献
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扫描探针显微镜(SPM)作为一种广泛应用的表面表征工具,不仅可以表征三维形貌,还能定量地研究表面的粗糙度、孔径大小和分布及颗粒尺寸,在许多学科均可发挥作用.以纳米材料为主要研究对象,综述了国外最新的几种扫描探针显微表征技术,包括扫描隧道显微镜(STM)、原子力显微镜(AFM)和近场扫描光学显微镜(SNOM)等方法,展示了这几种技术在纳米材料的结构和性能方面的应用. 相似文献
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研究了原子氢辅助分子束外延(MBE)中,原子氢对不同晶面GaAs外延层表面形貌特征的诱导作用.原子力显微镜(AFM)测试表明,在GaAs的(311)A和(331)A面,原子氢导致了台阶状形貌的形成.提出了一种简单模型,解释了台阶面形貌形成的物理机制.为最终有序低维纳米表面结构提供了一种实验参考. 相似文献
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POSS聚合物微观结构的原子力显微镜研究 总被引:2,自引:1,他引:1
采用轻敲及接触模式原子力显微镜(AFM)对不同POSS含量下的甲基丙烯酸丁酯-甲基丙烯酸甲酯-苯乙烯基-POSS聚合物的表面微观形态及聚集相的分布进行了考察.实验结果表明:轻敲模式及接触模式的AFM均可应用于POSS聚合物的微观结构研究,接触模式下对样品表面有一定损伤;聚合物表面的聚集相与本体聚合物具有相异的微观物理性质,为POSS分子聚集在一起形成的无机相;随着POSS含量的增加,POSS聚集体数量增多、尺寸增大;添加POSS后聚合物表面粗糙度减小. 相似文献
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H.‐L. Cheng Y.‐S. Mai W.‐Y. Chou L.‐R. Chang X.‐W. Liang 《Advanced functional materials》2007,17(17):3639-3649
Thickness‐dependent crystal structure, surface morphology, surface energy, and molecular structure and microstructure of a series of polycrystalline pentacene films with different film thickness ranging from several monolayers to the several hundred nanometers have been investigated using X‐ray diffraction (XRD), atomic force microscopy (AFM), contact angle meter, and Raman spectroscopy. XRD studies indicate that thin film polymorphs transformation behaviours are from the orthorhombic phase to the thin‐film phase and then to the triclinic bulk phase as measured by the increased tilt angle (θtilt) of the pentacene molecule from the c‐axis toward the a‐axis. We propose a growth model that rationalizes the θtilt increased along with increasing film thickness in terms of grain size and surface energy varying with film growth using AFM combined with contact angle measurements. The vibrational characterizations of pentacene molecules in different thickness films were investigated by Raman spectroscopy compared to density functional theory calculations of an isolated molecule. In combination with XRD and AFM the method enables us to distinguish the molecular microstructures in different thin film polymorphs. We proposed a methodology to probe the microscopic parameters determining the carrier transport properties based on Davydov splitting and the characteristics of aromatic C–C stretching modes in Raman spectra. When compared to the triclinic bulk phase at a high thickness, we suggest that the first few monolayer structures located at the dielectric surface could have inferior carrier transport properties due to weak intermolecular interactions, large molecular relaxation energy, and more grain boundaries. 相似文献
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A facile surface plasmon resonance (SPR) chip is developed for small molecule determination and analysis. The SPR chip was prepared based on a self assembling principle, in which the modified bovine serum albumin (BSA) was directly self-assembled onto the bare gold surface. The surface morphology of the chip with the modified BSA was investigated by atomic force microscopy (AFM) and its optical properties were characterized. The surface binding capacity of the bare facile SPR chip with a uniform morphology is 8 times of that of the bare control SPR chip. Based on the experiments of immune reaction between cortisol antibody and cortisol derivative, the sensitivity of the facile SPR chip with the modified BSA is much higher than that of the control SPR chip with the un-modified BSA. The facile SPR chip has been successfully used to detect small molecules. The lowest detection limit is 5 ng/mL with a linear range of 5—100 ng/mL for cortisol analysis. The novel facile SPR chip can also be applied to detect other small molecules. 相似文献
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TiO2超细微粒的有序组装 总被引:2,自引:0,他引:2
将水解法制备的TiO2超细闰溶胶液滴于水平旋转的高取向热解石墨(HOPG)基底上,可形成一定面积的有序性排列较好的二维结构,基底HOPG具有原子级粗糙度表面。沿液膜铺展方向取点进行原子力显微镜观察,证实了在扩展液膜边缘的TiO2超细微粒有序性最好,而且粒径最小;造近落滴位置处,粒子多聚集成一定的畴结构,粒子的粒径也增大。此外,对比观察了落滴于水平云母基底上形成膜的表面形貌,进行了相应的讨论。 相似文献
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有机薄膜电致发光器件的热效应及器件失效过程研究 总被引:1,自引:0,他引:1
制备器件的同时也在铟锡氧化物 (ITO)和各层有机薄膜上覆盖一层不透气的薄膜 ,然后快速退火 ,发现了导致有机薄膜电致发光器件的热效应及器件失效的可能因素 ,从而提出了一种与有机薄膜电致发光器件制备工艺完全兼容的工艺检测方法———覆盖加热对比法 相似文献
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A comparative atomic force microscopy study on living skin fibroblasts and liver endothelial cells 总被引:7,自引:0,他引:7
Braet F de Zanger R Seynaeve C Baekeland M Wisse E 《Journal of electron microscopy》2001,50(4):283-290
Atomic force microscopy (AFM) has been used to image a wide variety of cells and has proven to be successful in cellular imaging, by comparing results obtained by AFM with SEM or TEM. The aim of the present study was to investigate further the conditions for AFM imaging of living cells and compare the results with those obtained by SEM. We chose to image skin fibroblast and liver sinusoidal endothelial cells of two different sources, because these cells have been well described and characterized in earlier studies. AFM imaging of living cells mainly reveals submembranous structures, which could not be observed by SEM. This concerns the visualization of the overall cytoskeletal architecture and organelles, without the necessity of any preparative steps. The AFM study of living cells allows a time lapse study of dynamic changes of the actin cytoskeleton under the influence of the cytoskeleton-disturbing drug cytochalasin B in cells that can be followed individually during the process. However, softer samples, such as the fenestrated parts of living rat liver sinusoidal endothelial cells in culture could not be visualized. Apparently, these cell parts are disrupted due to tip-sample interaction in contact mode. To avoid the lateral forces and smearing artefacts of contact mode AFM, non-contact imaging was applied, resulting in images of higher quality. Still, endothelial fenestrae could not be visualized. In contrast, contact imaging of immortomouse liver sinusoidal endothelial cells, which are devoid of fenestrae, could easily be performed and revealed a detailed filamentous cytoskeleton. 相似文献
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振动模式扫描极化力显微镜采用一种新的扫描探针显微成像方式,它可以在极化力介导的非接触方式和轻敲方式之间自由切换。在极化力介导的非接触方式中,极化力叠加在范德华力上,克服了一般的原子力显微镜(AFM)非接触模式中因成像力程太短而不容易稳定的缺点;通过调节针尖的高度,从极化力介导的非接触方式进入到极化力介导的轻敲方式,又能部分消除AFM轻敲模式中毛细力的干扰,还可以用比AFM轻敲模式中最小稳定成像力更小的力进行成像。针尖的高度可以通过调节Asp(Amplitude setpoint)或插入扫描高度参数(lift scan height)来控制,这一方法简单易行。利用这一模式对肢体金颗粒和DNA的高度进行测量,在一定程度上证明了轻敲模式中针尖压力的确会造成柔软生物样品的变形。 相似文献