School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
Nanoscale. 2015 Oct 28;7(40):17079-87. doi: 10.1039/c5nr04259c.
In this study, we demonstrated nitrogen-doped graphene network supported few-layered graphene shell encapsulated Cu nanoparticles (NPs) (Cu@G-NGNs) as a sensing platform, which were constructed by a simple and scalable in situ chemical vapor deposition (CVD) technique with the assistance of a self-assembled three-dimensional (3D) NaCl template. Compared with pure Cu NPs and graphene decorated Cu NPs, the graphene shells can strengthen the plasmonic coupling between graphene and Cu, thereby contributing to an obvious improvement in the local electromagnetic field that was validated by finite element numerical simulations, while the 3D nitrogen-doped graphene walls with a large surface area facilitated molecule adsorption and the doped nitrogen atoms embedded in the graphene lattice can reduce the surface energy of the system. With these merits, a good surface enhanced Raman spectroscopy (SERS) activity of the 3D Cu@G-NGN painting film on glass was demonstrated using rhodamine 6G and crystal violet as model analytes, exhibiting a satisfactory sensitivity, reproducibility and stability. As far as we know, this is the first report on the in situ synthesis of nitrogen-doped graphene/copper nanocomposites and this facile and low-cost Cu-based strategy tends to be a good supplement to Ag and Au based substrates for SERS applications.
在这项研究中，我们展示了一种氮掺杂石墨烯网络负载少层石墨烯壳包裹的铜纳米粒子（Cu@G-NGNs）作为传感平台，它是通过简单且可扩展的原位化学气相沉积（CVD）技术，并在自组装的三维（3D）NaCl 模板的辅助下构建而成。与纯 Cu NPs 和石墨烯修饰的 Cu NPs 相比，石墨烯壳可以增强石墨烯和 Cu 之间的等离子体耦合，从而有助于通过有限元数值模拟验证的局域电磁场的明显增强，而具有大表面积的 3D 氮掺杂石墨烯壁有利于分子吸附，并且掺杂在石墨烯晶格中的氮原子可以降低系统的表面能。具有这些优点，通过使用罗丹明 6G 和结晶紫作为模型分析物，展示了玻璃上 3D Cu@G-NGN 涂漆膜良好的表面增强拉曼光谱（SERS）活性，表现出令人满意的灵敏度、重现性和稳定性。据我们所知，这是首次报道原位合成氮掺杂石墨烯/铜纳米复合材料，并且这种简便且低成本的 Cu 基策略有望成为 Ag 和 Au 基衬底在 SERS 应用中的良好补充。
