Center for Nanoscale Science and Technology, National Institute of Standards and Technology (NIST) , Gaithersburg, Maryland 20899, United States.
Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
ACS Appl Mater Interfaces. 2017 Aug 9;9(31):26492-26502. doi: 10.1021/acsami.7b02824. Epub 2017 May 8.
Atomic-scale thickness, molecular impermeability, low atomic number, and mechanical strength make graphene an ideal electron-transparent membrane for material characterization in liquids and gases with scanning electron microscopy and spectroscopy. Here, we present a novel sample platform made of an array of thousands of identical isolated graphene-capped microchannels with high aspect ratio. A combination of a global wide field of view with high resolution local imaging of the array allows for high throughput in situ studies as well as for combinatorial screening of solutions, liquid interfaces, and immersed samples. We demonstrate the capabilities of this platform by studying a pure water sample in comparison with alkali halide solutions, a model electrochemical plating process, and beam-induced crystal growth in liquid electrolyte. Spectroscopic characterization of liquid interfaces and immersed objects with Auger and X-ray fluorescence analysis through the graphene membrane are also demonstrated.
原子级厚度、分子不可渗透性、低原子数和机械强度使石墨烯成为扫描电子显微镜和光谱学在液体和气体中进行材料特性分析的理想电子透明膜。在这里，我们提出了一种由数千个相同的独立石墨烯覆盖微通道组成的新型样品平台，具有高纵横比。结合全局大视场和阵列的高分辨率局部成像，可以实现高通量的原位研究以及对溶液、液-固界面和浸入样品的组合筛选。我们通过研究纯水样品与碱卤溶液、模型电化学电镀过程以及液体电解质中的束致晶生长的对比，展示了该平台的功能。通过石墨烯膜进行俄歇和 X 射线荧光分析对液-固界面和浸入物体的光谱特性进行了表征。
