共查询到20条相似文献,搜索用时 140 毫秒
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利用各向异性化学湿法刻蚀工艺在Si(100)上加工了具有本征侧墙角(54.73°)的典型微机电系统(MEMS)梯形结构.用该微结构作为线宽测试结构,对其进行了原子力显微镜(AFM)和扫描电子显微镜(SEM)线宽和轮廓的比对测量.并对AFM探针和样品耦合效应进行了研究,提出了AFM探针参数动态表征的模型,基于几何模型对线宽和轮廓测量中探针针尖形状和针尖位置参数进行了表征,提出了用曲率半径、安装倾角、扫描倾角和针尖半顶角来对原子力显微镜探针针尖进行表征.该方法是对现有AFM探针表征模型的改进和完善. 相似文献
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纳米栅格和台阶等结构的线宽准确测量,是国内外计量领域的研究热点与难点。采用原子力显微镜(AFM)能获得上述结构的三维形貌信息,但其扫描图像却是探针针尖的形貌和被测样品表面的形貌共同作用的结果,这种作用往往导致线宽边缘测量失真。为了更加精确地获得样品的表面形貌特征,首先需要重建探针针尖形貌,进而从得到的扫描图像中尽可能地消除由探针形貌带来的失真影响。基于数学形态学的盲重建理论,利用Matlab对不同形状参数的探针针尖扫描台阶样品表面进行了仿真,评价了探针形状对扫描结果的影响,初步实现了基于真实粗糙测量表面的探针针尖形状重建。 相似文献
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《中国计量学院学报》2016,(3):258-263
按照GB/T 1551-2009《硅单晶电阻率测定方法》,用四探针法测量硅单晶的电阻率,分析了测试过程中的不确定度来源并量化各分量,计算出了该方法的合成标准不确定度和扩展不确定度. 相似文献
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《中国新技术新产品》2015,(16)
本文根据JJG99-2006砝码检定规程,分析各种测量不确定度的来源,通过输测量过程的引起不确定度、标准砝码引起的不确定度、天平显示分辨力引起的不确定度的评定,空气浮力引起的不确定度、磁性引入的不确定度、计算出砝码在各称量点的不确定度评估值。 相似文献
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测量不确定度是对测量结果可疑程度的一种定理表述,为减小实验误差,提高检测精确度,我们分析了饮料中菌落总数测量不确定的来源,评定了由重复性测量的分散性引起的测量不确定度.测量结果显示扩不确定度为0.0633。 相似文献
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对X射线荧光光谱法测定镁合金中Zn元素的不确定度来源进行分析,并对测量过程中的不确定度分量进行评定。测量不确定度主要来源于测量重复性、标准样品和工作曲线回归。计算各分量的标准不确定度和合成标准不确定度。合成标准不确定度乘以95%置信概率下的包含因子2,得到测量结果的扩展不确定度。不确定度评定结果表明,工作曲线回归引起的不确定度对总不确定度贡献最大。 相似文献
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原子力显微镜探针原位有效参数对线宽测量的修正 总被引:1,自引:0,他引:1
针对原子力显微镜(AFM)的线宽和轮廓的精确测量,对AFM探针的原位有效参数进行了定义和表征,提出使用AFM探针的原位有效参数对AFM的线宽测量结果进行修正的模型。采用有效半径和半内角表征AFM探针的复合形状,悬臂轴倾角表征探针的安装状态,设计了具有不同梯形截面的两个表征样板,通过对表征样板进行AFM和扫描电子显微镜(SEM)的比对测量获得了探针的原位有效参数。提出了在线宽测量中,当AFM的扫描轮廓线具有不同的斜度时分别采用的不同的修正公式。采用此公式和探针的原位参数对掩膜板的AFM线宽测量结果进行了修正。 相似文献
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Han G Jiang Z Jing W Prewett PD Jiang K 《Journal of nanoscience and nanotechnology》2011,11(12):11041-11044
An atomic force microscopy image is a dilation of the specimen surface with the probe tip. Tips wear or are damaged as they are used. And AFM tip shape and position status make AFM images distorted. So it is necessary to characterize AFM tip shape and position parameters so as to reconstruct AFM images. A geometric model-based approach is presented to estimate AFM tip shape and position status by AFM images of test specimens and scanning electron microscope (SEM) images of AFM tip. In this model, the AFM tip is characterized by using a dynamic cone model. The geometric relationship between AFM tip and the sample structure is revealed in linewidth and profile measurement. The method can easily calculate the tip parameters including half-cone angle, installation angle, scanning tilting angle and curvature radius, and easily estimate the position status of AFM tip when AFM tip moves on the specimen. The results of linewidth and profile measurement are amended accurately through this approach. 相似文献
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Accuracy of the spring constant of atomic force microscopy cantilevers by finite element method 总被引:1,自引:0,他引:1
Atomic force microscopy (AFM) probe with different functions can be used to measure the bonding force between atoms or molecules. In order to have accurate results, AFM cantilevers must be calibrated precisely before use. The AFM cantilever's spring constant is usually provided by the manufacturer, and it is calculated from simple equations or some other calibration methods. The spring constant may have some uncertainty, which may cause large errors in force measurement. In this paper, finite element analysis was used to obtain the deformation behavior of the AFM cantilever and to calculate its spring constant. The influence of prestress, ignored by other methods, is discussed in this paper. The variations of Young's modulus, Poisson's ratio, cantilever geometries, tilt angle, and the influence of image tip mass were evaluated to find their effects on the cantilever's characteristics. The results were compared with those obtained from other methods. 相似文献
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A calibration method is presented for determining the spring constant of atomic force microscope (AFM) cantilevers, which is a modification of the established Cleveland added mass technique. A focused ion beam (FIB) is used to remove a well-defined volume from a cantilever with known density, substantially reducing the uncertainty usually present in the added mass method. The technique can be applied to any type of AFM cantilever; but for the lowest uncertainty it is best applied to silicon cantilevers with spring constants above 0.7?N?m(-1), where uncertainty is demonstrated to be typically between 7 and 10%. Despite the removal of mass from the cantilever, the calibration method presented does not impair the probes' ability to acquire data. The technique has been extensively tested in order to verify the underlying assumptions in the method. This method was compared to a number of other calibration methods and practical improvements to some of these techniques were developed, as well as important insights into the behavior of FIB modified cantilevers. These results will prove useful to research groups concerned with the application of microcantilevers to nanoscience, in particular for cases where maintaining pristine AFM tip condition is critical. 相似文献
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Elastic property of vertically aligned nanowires 总被引:1,自引:0,他引:1
An atomic force microscopy (AFM) based technique is demonstrated for measuring the elastic modulus of individual nanowires/nanotubes aligned on a solid substrate without destructing or manipulating the sample. By simultaneously acquiring the topography and lateral force image of the aligned nanowires in the AFM contacting mode, the elastic modulus of the individual nanowires in the image has been derived. The measurement is based on quantifying the lateral force required to induce the maximal deflection of the nanowire where the AFM tip was scanning over the surface in contact mode. For the [0001] ZnO nanowires/nanorods grown on a sapphire surface with an average diameter of 45 nm, the elastic modulus is measured to be 29 +/- 8 GPa. 相似文献