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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Graphene Grown on Ni Foam: Molecular Sensing, Graphene-Enhanced Raman Scattering, and Galvanic Exchange for Surface-Enhanced Raman Scattering Applications
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Graphene Grown on Ni Foam: Molecular Sensing, Graphene-Enhanced Raman Scattering, and Galvanic Exchange for Surface-Enhanced Raman Scattering Applications

机译：Ni泡沫上生长的石墨烯：分子传感，石墨烯增强拉曼散射，以及用于表面增强拉曼散射应用的电流交换

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摘要

The growth of graphene on an irregular three-dimensional (3D) Ni structure is demonstrated to be an interesting platform for molecular sensing, graphene-enhanced Raman scattering, and surface-enhanced Raman scattering (SERS) applications after galvanic exchange of Ag+ ions. Raman, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), optical images, and diffuse reflectance demonstrate that graphene grows in a multilayer fashion with different stacking configurations. Statistics performed employing Raman show that the as -grown graphene can be classified into two main stacking configurations: AB (or Bernal stacking) and rotated graphene, which are separated by a full width at half-maximum (fwhm) threshold of similar to 30 cm(-1) corresponding to the 2D Raman band. The rotated stacking senses low concentrations of methylene blue (MB), whereas the AB stacking seems to be much less sensitive upon molecular adsorption. The galvanic exchange of Ag leads to agglomerates preferentially formed on top of graphene wrinkles, which ultimately became the target spots for performing SERS. Our experiments demonstrate that the as-grown graphene, composed of different stacking configurations, can be used as a molecular sensor to detect 10(-6) M concentration of MB as well as nanomolar concentrations of MB and thiram (by SERS applications), after the galvanic exchange with Ag.
机译：将石墨烯对不规则三维（3D）Ni结构的生长被证明是用于分子传感，石墨烯增强拉曼散射和表面增强的拉曼散射（SERS）应用的有趣平台。拉曼，扫描电子显微镜（SEM），能量分散光谱（EDX），光学图像和漫射反射率证明石墨烯在具有不同堆叠配置的多层时尚中生长。采用拉曼进行的统计数据表明，AS-BLOWN Graphene可以分为两个主要堆叠配置：AB（或伯尼堆叠）和旋转石墨烯，其在与30cm相似的半最大（FWHM）阈值下通过全宽分开（-1）对应于2D拉曼带。旋转的堆叠感测低浓度的亚甲蓝（MB），而AB堆叠似乎对分子吸附的敏感性较小。 Ag的电流交换导致优先形成在石墨烯皱纹顶部的附聚物，这最终成为执行SERS的目标斑点。我们的实验表明，由不同的堆叠配置组成的生长石墨烯可以用作检测10（-6）M浓度的MB和纳米浓度的MB和Thiram（通过SERS应用）的分子传感器。 agvanic交换与AG。

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