In this work, the graphene quantum dots (GQDs_x, x = 1, 2 and 3) with various surface states were synthesized. Subsequently, GQDs_x were facially assembled with glycine derivative (G₆) and gold nanoparticles (AuNPs), and novel AuNPs/G₆/GQDs_x composites were achieved. Furthermore, the fluorescence and SERS results showed the strong dependence on the surface state of GQDs excluding the quantum size effects, which demonstrated the close relationship between the energy transfer efficiency of photoexcited GQDs_x and AuNPs. In addition, in comparision with the crystal violet (CV)’ SERS response on GQDs_x and AuNPs/G₆/GQDs_x substrate, it was indicated that the electromagnetic fields effect of AuNPs/G₆/GQDs_x was also closely related to the surafce state of GQDs. Moreover, the synergetic effect of AuNPs with GQDs_x was beneficial to improve the SERS response of AuNPs/G₆/GQDs_x substrate.

在这项工作中，合成了具有各种表面态的石墨烯量子点（GQDs _x，x = 1、2 和 3）。随后，GQDs _x与甘氨酸衍生物（G ₆）和金纳米粒子（AuNPs）进行表面组装，并获得了新型的AuNPs/G ₆ /GQDs _x复合材料。此外，荧光和 SERS 结果表明除量子尺寸效应外，对 GQDs 的表面态有很强的依赖性，这表明光激发的 GQDs _x和 AuNPs的能量转移效率之间存在密切关系。此外，与 GQDs _x和 AuNPs/G ₆ /GQDs _x上的结晶紫 (CV) 的 SERS 响应相比结果表明，AuNPs/G ₆ /GQDs _x的电磁场效应也与 GQDs 的表面状态密切相关。此外，AuNPs 与 GQDs _x的协同作用有利于提高 AuNPs/G ₆ /GQDs _x衬底的 SERS 响应。