Theory of Single-Impact Atomic Force Spectroscopy in liquids with material contrast.
Theory of Single-Impact Atomic Force Spectroscopy in liquids with material contrast.
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DOI：
10.1038/s41598-018-25828-4
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发表时间：
2018-05-14
影响因子：
4.6
通讯作者：
Ferrini G
中科院分区：
文献类型：
--
作者：
López-Guerra EA;Banfi F;Solares SD;Ferrini G
扫描探针显微镜已经能够在重要的技术材料中进行纳米尺度的机械特性映射，例如组织、生物材料、聚合物、复合材料的纳米界面，仅举几例。为了改善和拓宽纳米级机械性能的测量，已经提出了许多方法来克服广泛使用的力-位移模式，该模式固有地缓慢并且限于准静态状态，主要使用样品基底或悬臂的多个正弦激励。这里，提出了一种不同的方法。它利用小波变换分析的独特功能来利用短时间光谱实验中编码的信息。它是基于悬臂梁的脉冲激励和尖端与样品的单次冲击。它在高阻尼环境中表现良好，这在其他标准动态方法中通常被视为有问题。我们的结果是非常有前途的粘弹性性能的歧视。它们的潜力面向（但不限于）需要在液体原生环境中成像的样品，以及通过标准敲击成像技术无法获得其组成映射的高度脆弱的样品。
Scanning probe microscopy has enabled nanoscale mapping of mechanical properties in important technological materials, such as tissues, biomaterials, polymers, nanointerfaces of composite materials, to name only a few. To improve and widen the measurement of nanoscale mechanical properties, a number of methods have been proposed to overcome the widely used force-displacement mode, that is inherently slow and limited to a quasi-static regime, mainly using multiple sinusoidal excitations of the sample base or of the cantilever. Here, a different approach is put forward. It exploits the unique capabilities of the wavelet transform analysis to harness the information encoded in a short duration spectroscopy experiment. It is based on an impulsive excitation of the cantilever and a single impact of the tip with the sample. It performs well in highly damped environments, which are often seen as problematic in other standard dynamic methods. Our results are very promising in terms of viscoelastic property discrimination. Their potential is oriented (but not limited) to samples that demand imaging in liquid native environments and also to highly vulnerable samples whose compositional mapping cannot be obtained through standard tapping imaging techniques.
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