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Graphene‐coated Au nanoparticle‐enhanced Raman spectroscopy
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-07-15 , DOI: 10.1002/jrs.5950 Yue-Jiao Zhang 1 , Qing-Qi Chen 1 , Xing Chen 1 , An Wang 1 , Zhong-Qun Tian 1 , Jian-Feng Li 1
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-07-15 , DOI: 10.1002/jrs.5950 Yue-Jiao Zhang 1 , Qing-Qi Chen 1 , Xing Chen 1 , An Wang 1 , Zhong-Qun Tian 1 , Jian-Feng Li 1
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Surface‐enhanced Raman spectroscopy (SERS) is a powerful surface analytical technique; however, its lack of material and morphological generality is a longtime limitation. The invention of shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) using silica shell‐encapsulated Au nanoparticles (NPs) overcomes these problems. Whereas, it is difficult to obtain a silica shell (less than 1 nm thick) without pinholes for generating extremely high SERS enhancements. Graphene is one of the most promising two‐dimensional materials, which has a single‐atom layer thickness. Moreover, graphene can provide additional SERS chemical enhancement. Herein, we prepared graphene‐coated Au (Au@G) NPs via chemical vapor deposition (CVD). The graphene shell thickness could be controlled from a few layers to multilayers, and the Au@G SERS activities were characterized using mercaptobenzoic acid (MBA) as a probe molecule. Both the pH and high‐temperature stabilities of the Au@G nanoparticles were characterized. Also, Pt‐on‐Au@G satellite structures were developed via a self‐assembly method. Whereby Au@G nanoparticles were coated with Pt nanocatalysts, and this bifunctional SERS substrate could be used to monitor in situ catalytic reaction mechanisms occurring on the Pt surface.
中文翻译：
石墨烯包覆的金纳米粒子增强拉曼光谱
表面增强拉曼光谱（SERS）是一种强大的表面分析技术。然而，其缺乏材料和形态学通用性是长期的限制。使用二氧化硅壳包裹的金纳米颗粒（NPs）的壳分离的纳米颗粒增强拉曼光谱（SHINERS）的发明克服了这些问题。然而，难以获得没有针孔以产生极高的SERS增强的二氧化硅壳（小于1nm厚）。石墨烯是最有前途的二维材料之一，具有单原子层的厚度。此外，石墨烯可以提供额外的SERS化学增强作用。在这里，我们通过化学气相沉积（CVD）制备了石墨烯涂层的Au（Au @ G）NP。石墨烯壳的厚度可以控制在几层到多层之间，以巯基苯甲酸（MBA）为探针分子表征了Au @ G SERS活性。表征了Au @ G纳米颗粒的pH值和高温稳定性。此外，通过自组装方法开发了Pu-on-Au @ G卫星结构。因此，Au @ G纳米颗粒被Pt纳米催化剂包覆，这种双功能SERS底物可用于监测在Pt表面上发生的原位催化反应机理。
更新日期：2020-07-15
中文翻译：
石墨烯包覆的金纳米粒子增强拉曼光谱
表面增强拉曼光谱（SERS）是一种强大的表面分析技术。然而，其缺乏材料和形态学通用性是长期的限制。使用二氧化硅壳包裹的金纳米颗粒（NPs）的壳分离的纳米颗粒增强拉曼光谱（SHINERS）的发明克服了这些问题。然而，难以获得没有针孔以产生极高的SERS增强的二氧化硅壳（小于1nm厚）。石墨烯是最有前途的二维材料之一，具有单原子层的厚度。此外，石墨烯可以提供额外的SERS化学增强作用。在这里，我们通过化学气相沉积（CVD）制备了石墨烯涂层的Au（Au @ G）NP。石墨烯壳的厚度可以控制在几层到多层之间，以巯基苯甲酸（MBA）为探针分子表征了Au @ G SERS活性。表征了Au @ G纳米颗粒的pH值和高温稳定性。此外，通过自组装方法开发了Pu-on-Au @ G卫星结构。因此，Au @ G纳米颗粒被Pt纳米催化剂包覆，这种双功能SERS底物可用于监测在Pt表面上发生的原位催化反应机理。
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