共查询到19条相似文献,搜索用时 234 毫秒
1.
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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本文介绍了纳米测量系统的组成和纳米样板的研究现状,讨论了AFM探针诱导局域氧化工艺的原理及其影响参数。用该方法进行了一维纳米结构样板的制备,并对实验结果进行了分析。 相似文献
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针对纳米器件中的典型几何特征,制备了3种纳米结构,采用扫描电子显微镜(SEM)、原子力显微镜(AFM)等测量工具对所制备的纳米样板进行了测量、分析和表征。提出转换薄膜厚度为线宽的公称值、基于多层薄膜淀积技术制备纳米宽度结构的方法,制备出了具有名义线宽尺寸分别为20 nm、25 nm、35 nm的纳米栅线结构。用离线的图像分析算法对所制备的纳米线宽样板的线边缘粗糙度/线宽粗糙度(LER/LWR)以及栅线线宽的一致性进行了评估。实验表明所制备纳米线宽样板的栅线具有较好的一致性,LER/LWR值小,且具有垂直的侧壁。采用电子束直写技术(EBL)和感应耦合等离子体刻蚀(ICP)制备了名义高度为220 nm的硅台阶样板。实验表明刻蚀后栅线边缘LER/LWR的高频成分减少,相关长度变长,均方根偏差值(σ)增大。采用聚焦离子束(FIB)制备了纳米单台阶和多台阶结构,并对Z方向的尺度与加工能量之间的关系进行了分析。 相似文献
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用于减小控制对测量影响的AFM新工作模式 总被引:3,自引:1,他引:2
原子力显微镜(atomic force microscope,AFM)是纳米尺度线宽成像和测量的重要工具.但系统的非线性和控制器参数选择的多样性导致AFM控制的不确定性,影响了AFM测量结果的精确性和重复性.为克服这个缺点,分析了AFM的测量原理和工作模式的特点,在此基础上提出了一种新的工作模式——补偿模式.在这种工作模式中,结合了扫描器和悬臂梁的位置信息而得到被测试样表面的形貌图像.与恒力接触模式相比,在补偿模式下,AFM能够在高速度下以更好的精确性和重复性进行成像和测量.仿真和实验结果证明了这种新工作模式的可行性和适用性.实验结果说明该工作模式可以提高扫描速度16倍或减小均方根误差到约1/5. 相似文献
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针对原子力显微镜(AFM)纳米成像中存在的失真问题,研究了通过探针建模实现AFM扫描图像重构方法.目前探针盲建模算法在重构AFM图像时存在较大误差,因此提出基于探针模型预估计的AFM扫描图像重构方法.该方法采用分区探针针尖建模,并通过基于该探针模型的反卷积运算实现AFM扫描图像重构,获得比较接近真实形貌的AFM扫描图像.文中介绍了算法的具体步骤,通过仿真和实验结果证明,该方法能够有效降低AFM图像重构时引入的误差,得到的图像更能反映样品表面真实的形貌. 相似文献
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详细分析了P47型原子力显微镜线宽测量不确定度的来源,给出了基于几何形状的线宽测量模型,提出了线宽测量不确定度的评定路线和方法。确定了探针针尖引起的测量不确定度是AFM线宽测量不确定度的主要来源,并对其进行了定量分析。普通Si3N4探针针尖引起的不确定度分量约占线宽总量的5%。 相似文献
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《中国材料科技与设备》2012,(5):63-63
安捷伦科技致力于为您提供最先进的、适用于多种学科,且可以进行交互平台操作的测量技术和仪器,特别是高精度、模块化的扫描探针显微镜(SPM)和原子力显微镜(AFM),用于高精度表征纳米力学表征的纳米压痕仪或纳米力学试验机(UTM),以及最新推出的功能强大、体积小巧的低电压场发射扫描电子显微镜(FE-SEM)。 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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A novel nanoknife with a buffering beam is proposed for single-cell cutting. The nanoknife was fabricated from a commercial atomic force microscopy (AFM) cantilever by focused-ion-beam (FIB) etching technique. The material identification of the nanoknife was determined using the energy dispersion spectrometry (EDS) method. It demonstrated that the gallium ion pollution of the nanoknife can be ignored during the etching processes. The buffering beam was used to measure the cutting force based on its deformation. The spring constant of the beam was calibrated based on a referenced cantilever by using a nanomanipulation approach. The tip of the nanoknife was designed with a small edge angle 5° to reduce the compression to the cell during the cutting procedure. For comparison, two other nanoknives with different edge angles, i.e. 25° and 45°, were also prepared. An in situ single-cell cutting experiment was performed using these three nanoknives inside an environmental scanning electron microscope (ESEM). The cutting force and the sample slice angle for each nanoknife were evaluated. It showed the compression to the cell can be reduced when using the nanoknife with a small edge angle 5°. Consequently, the nanoknife was capable for in situ single-cell cutting tasks. 相似文献
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对原子力显微镜探针与填充SiO2颗粒橡胶之间的相互作用进行了分析,利用"tapping"模式原子力显微镜相位图像研究了橡胶中填充SiO2颗粒的微分布,并对SiO2颗粒的微分布进行了统计分析. 相似文献
14.
Jinhui Song Huizhi Xie Wenzhuo Wu V. Roshan Joseph C. F. Jeff Wu Zhong Lin Wang 《Nano Research》2010,3(9):613-619
Nanogenerators were first demonstrated by deflecting aligned ZnO nanowires using a conductive atomic force microscopy (AFM)
tip. The output of a nanogenerator is affected by three parameters: tip normal force, tip scanning speed, and tip abrasion.
In this work, systematic experimental studies have been carried out to examine the combined effects of these three parameters
on the output, using statistical design of experiments. A statistical model has been built to analyze the data and predict
the optimal parameter settings. For an AFM tip of cone angle 70° coated with Pt, and ZnO nanowires with a diameter of 50 nm
and lengths of 600 nm to 1 μm, the optimized parameters for the nanogenerator were found to be a normal force of 137 nN and
scanning speed of 40 μm/s, rather than the conventional settings of 120 nN for the normal force and 30 μm/s for the scanning
speed. A nanogenerator with the optimized settings has three times the average output voltage of one with the conventional
settings. 相似文献
15.
Lee MV Hoffman MT Barnett K Geiss JM Smentkowski VS Linford MR Davis RC 《Journal of nanoscience and nanotechnology》2006,6(6):1639-1643
We present a two-fold extension of previous work on Atomic Force Microscope-based chemomechanical functionalization: (1) chemomechanical nanografting, which extends chemomechanical functionalization to a more stable initial surface, and (2) linewidth studies that show the impact of force and Atomic Force Microscope probe tip wear on patterning resolution. Alkene, alcohol, and alkyl halide molecules were nanografted to silicon and imaged with in situ atomic force microscopy, time-of-flight secondary ion mass spectrometry with Automated eXpert Spectrum Image Analysis, and scanning electron microscopy. Chemomechanical nanografting demonstrated linewidths down to 50 nm. Lines written on hydrogen-terminated silicon were used to explore the impact of tip radius and tip wear on linewidth when using Si3N4 coated tips. 相似文献
16.
Single-wall carbon nanotube (SWNT) nanofibrils were assembled onto a variety of conductive scanning probes including atomic force microscope (AFM) tips and scanning tunnelling microscope (STM) needles using positive dielectrophoresis (DEP). The magnitude of the applied electric field was varied in the range of 1-20?V to investigate its effect on the dimensions of the assembled SWNT nanofibrils. Both length and diameter grew asymptotically as voltage increased from 5 to 18?V. Below 4?V, stable attachment of SWNT nanofibrils could not be achieved due to the relatively weak DEP force versus Brownian motion. At voltages of 20?V and higher, low quality nanofibrils resulted from incorporating large amounts of impurities. For intermediate voltages, optimal nanofibrils were achieved, though pivotal to this assembly is the wetting behaviour upon tip immersion in the SWNT suspension drop. This process was monitored in situ to correlate wetting angle and probe geometry (cone angles and tip height), revealing that probes with narrow cone angles and long shanks are optimal. It is proposed that this results from less wetting of the probe apex, and therefore reduces capillary forces and especially force transients during the nanofibril drawing process. Relatively rigid probes (force constant ≥2?N?m(-1)) exhibited no perceivable cantilever bending upon wetting and de-wetting, resulting in the most stable process control. 相似文献
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A calculation of the lateral force interaction between an atomic force microscope (AFM) tip and a nano-object on a substrate is presented. In particular, the case where the AFM tip is used to manipulate the nano-object is considered; i.e., the tip is displaced across the nano-object with the feedback off. The Hamaker equations are used to calculate the force when the tip and sample are not in contact and the Johnson, Kendall and Roberts (JKR) or Derjaguin, Muller and Toporov (DMT) formalisms are used for the contact force. The effect of the material parameters, the choice of contact theory and the shape of the nano-object on the resulting lateral forces are explored. The calculation is applied to an experimental system consisting of a cadmium selenide nanorod on graphite. 相似文献
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针对原子力显微镜(AFM)成像过程中针尖展宽效应引起的误差,提出一种基于条件生成式对抗网络(CGAN)的AFM图像盲重构方法。首先,以pix2pixHD模型为基础,通过全局生成网络对仿真样本数据进行对抗训练,引入AFM测量数据采用局部提升网络联合训练;最后,特征匹配损失函数以用于提升栅格边缘横向分辨力。实验结果表明:对于线宽8μm一维矩形栅格在AFM下的测量图像进行盲重构,重构图像标准差为0.33μm×0.45μm,具有较高的成像分辨力,有利于提升AFM图像一维栅格测量的准确度。 相似文献