Mapping Elastic Properties of Heterogeneous Materials in Liquid with Angstrom-Scale Resolution
Mapping Elastic Properties of Heterogeneous Materials in Liquid with Angstrom-Scale Resolution
复制标题
DOI：
10.1021/acsnano.7b04381
复制
发表时间：
2017-09-01
期刊：
影响因子：
17.1
通讯作者：
Garcia, Ricardo
中科院分区：
文献类型：
--
作者：
Amo, Carlos A.;Perrino, Alma P.;Garcia, Ricardo
具有纳米尺度空间分辨率的力学性能快速定量映射是力显微镜的主要目标之一。当表征需要在涉及液体溶液的原生环境中以亚纳米分辨率完成时，这一目标变得更具挑战性。在这里，我们证明了双峰原子力显微镜能够以3埃的空间分辨率精确测量液体表面的弹性模量。杨氏模量在5个数量级范围内（1mpa至100gpa）的相对误差小于5%。这个范围包括从蛋白质到金属有机框架的各种材料。数值仿真验证了该方法的准确性。一个亚纳米空间分辨率的杨氏模量图大约需要30秒。
Fast quantitative mapping of mechanical properties with nanoscale spatial resolution represents one of the major goals of force microscopy. This goal becomes more challenging when the characterization needs to be accomplished with subnanometer resolution in a native environment that involves liquid solutions. Here we demonstrate that bimodal atomic force microscopy enables the accurate measurement of the elastic modulus of surfaces in liquid with a spatial resolution of 3 angstrom. The Young's modulus can be determined with a relative error below 5% over a 5 orders of magnitude range (1 MPa to 100 GPa). This range includes a large variety of materials from proteins to metal-organic frameworks. Numerical simulations validate the accuracy of the method. About 30 s is needed for a Young's modulus map with subnanometer spatial resolution.