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首页> 外文期刊>Journal of Materials Engineering and Performance >Interaction Between Liquid Silver and Graphene-Coated SiC Substrate
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Interaction Between Liquid Silver and Graphene-Coated SiC Substrate

机译：液体银和石墨烯涂层SiC衬底之间的相互作用

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摘要

Wettability between liquid Ag and graphene-coated SiC single crystal has been investigated by dispensed drop method at T = 970 degrees C under vacuum accompanied with subsecond recording of the drop/substrate images (100 frames per second) by high-speed high-resolution CCD camera. Non-contact heating method coupled with capillary purification of the Ag drop procedure has been applied. Scanning electron microscopy combined with EDS analysis and scanning probe microscopy combined with Raman spectroscopy techniques has been utilized for microstructure and surface characterization of samples before and after high-temperature wetting tests Immediately after its detachment from the capillary, the Ag drop showed non-wetting behavior (theta 90 degrees) forming a high contact angle of theta = 114 degrees. Surface characterization of the drop surface after wettability tests evidenced the presence of graphene and Si transferred from the substrate to the top of Ag drop. These findings suggest chemical interaction phenomena occurring at the interface. Locally, an intimate contact between liquid Ag and SiC substrate was allowed by the appearance of discontinuities in the graphene layer basically produced by thermomechanical stress. Local dissolution of carbon into liquid Ag and its reorganization (by segregation, nucleation and growth) as secondary graphene layer at the Ag surface was also observed.
机译：通过在T = 970摄氏度下，在真空下，通过高速高分辨率CCD的储气记录（每秒100帧）的真空，通过在T = 970℃下的分配的液滴法研究了液体Ag和石墨烯涂覆的SiC单晶之间的润湿性。相机。已经施加了与毛细管净化的非接触式加热方法已经应用。将扫描电子显微镜联合EDS分析和扫描探针显微镜与拉曼光谱技术结合使用，用于在其从毛细管分离后立即进行高温润湿试验前后的样品的微观结构和表面表征，AG降显示非润湿行为（θ＆ 90度）形成θ= 114度的高接触角。润湿性试验后落叶表面的表面表征证明了石墨烯的存在和从基板转移到Ag降的顶部。这些发现表明了在界面处发生的化学相互作用现象。在本地，通过热机械应力基本产生的石墨烯层中的不连续性地允许液体AG和SiC衬底之间的紧密接触。还观察到碳对液体Ag的局部溶解及其重组（通过偏析，成核和生长）作为AG表面的次级石墨烯层。

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