Shell-isolated surface-enhanced Raman scattering (shell-isolated SERS), where the isolating shell prevents metal–molecule interactions and improves the stability of the metal nanoparticles, has recently drawn a tremendous amount of attention. However, obtaining an ultrathin, seamless, and chemically stable isolating shell for shell-isolated SERS is still in its infancy. Graphene, with a high optical transparency and chemical inertness, is an ideal candidate to serve as an isolating shell. In the present work, graphene with a controlled number of layers is grown on the surface of metal nanoparticles via chemical vapor deposition, creating graphene-encapsulated metal nanoparticles ([email protected], where M = Cu, Ag, and Au) suitable for shell-isolated SERS. Ultraviolet–visible spectroscopy of [email protected], [email protected], and their corresponding nanoparticles indicates that graphene can prevent the surface oxidation of Ag and Cu nanoparticles after exposure to ambient air, giving a SERS-active substrate with a long lifetime. The Raman spectra of cobalt phthalocyanine and rhodamine 6G on [email protected] substrates show that [email protected] can dramatically suppress photobleaching and fluorescence of the probe molecules, resulting in an enhanced Raman signal. Hence, [email protected] is a promising material for applications in chemical and biological detection because of its long-term stability and superior SERS performance.

中文翻译：

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用于表面增强拉曼光谱的几层石墨烯包裹的金属纳米粒子

壳隔离的表面增强拉曼散射（壳隔离的SERS），其中的隔离壳可防止金属与分子之间的相互作用并提高金属纳米颗粒的稳定性，最近引起了极大的关注。然而，获得用于壳分离的SERS的超薄，无缝且化学稳定的分离壳仍处于起步阶段。具有高的光学透明性和化学惰性的石墨烯是用作隔离壳的理想候选物。在本工作中，通过化学气相沉积在金属纳米颗粒的表面上生长了具有受控层数的石墨烯，从而形成了适用于壳的石墨烯包裹的金属纳米颗粒（[电子邮件保护]，其中M = Cu，Ag和Au） -隔离的SERS。[电子邮件保护]，[电子邮件保护]，其相应的纳米颗粒表明，石墨烯可以防止暴露于环境空气中的Ag和Cu纳米颗粒的表面氧化，从而提供具有长寿命的SERS活性基质。钴酞菁和若丹明6G在[受电子邮件保护的]基材上的拉曼光谱表明，[受电子邮件保护]可以显着抑制探针分子的光致漂白和荧光，从而增强拉曼信号。因此，由于具有长期稳定性和卓越的SERS性能，[电子邮件保护]是一种有前途的材料，可用于化学和生物检测。钴酞菁和若丹明6G在[受电子邮件保护的]基材上的拉曼光谱表明，[受电子邮件保护]可以显着抑制探针分子的光致漂白和荧光，从而增强拉曼信号。因此，由于具有长期稳定性和卓越的SERS性能，[电子邮件保护]是一种有前途的材料，可用于化学和生物检测。钴酞菁和若丹明6G在[受电子邮件保护的]基材上的拉曼光谱表明，[受电子邮件保护]可以显着抑制探针分子的光致漂白和荧光，从而增强拉曼信号。因此，由于具有长期稳定性和卓越的SERS性能，[电子邮件保护]是一种有前途的材料，可用于化学和生物检测。