Enhancing dynamic scanning force microscopy in air: as close as possible
Enhancing dynamic scanning force microscopy in air: as close as possible
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DOI：
10.1088/0957-4484/20/8/085707
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发表时间：
2009-02
期刊：
影响因子：
3.5
通讯作者：
E. Palacios-Lidón;B. Pérez-García;J. Colchero
中科院分区：
文献类型：
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作者：
E. Palacios-Lidón;B. Pérez-García;J. Colchero
频率调制动态扫描力显微镜已在环境条件下使用低振荡幅度（<1 nm），同时记录不仅地形，但也额外的信息通道，特别是接触电位图像。使用生物分子，变黄花叶病毒RNA作为模型样本，详细分析了这种模式的性能相比，传统的幅度调制模式。扫描力显微镜成像以及光谱实验的基础上，我们发现，对于这样的非常小的样品的频率调制模式是上级的，因为它可以操作与较小的针尖样品相互作用，较小的有效针尖样品距离和较低的力。结合开尔文探针显微镜，它的结果不仅在相当高的静电分辨率，而且在正确的定量值的接触电位相比，传统的调幅扫描力显微镜。
Frequency modulation dynamic scanning force microscopy has been implemented in ambient conditions using low oscillation amplitudes (<1 nm) to simultaneously record not only topographic but also additional channels of information, in particular contact potential images. The performance of this mode as compared to the conventional amplitude modulation mode is analyzed in detail using a biological molecule, turning yellow mosaic virus RNA, as the model sample. On the basis of scanning force microscopy imaging as well as spectroscopy experiments, we find that for such very small samples the frequency modulation mode is superior since it can be operated with smaller tip–sample interaction, smaller effective tip–sample distance and lower forces. Combined with Kelvin probe microscopy it results not only in considerably higher electrostatic resolution, but also in correct quantitative values for the contact potential as compared to traditional amplitude modulation scanning force microscopy.