In this work, gold nanoparticles (AuNPs) of various sizes (Au_x, x = 32, 50, 68, 87 and 107 nm) were facially assembled with a glycine derivative (G₆) and graphene quantum dots (GQDs), respectively. Subsequently, novel core–shell-like Au_x/glycine derivative (G₆)/graphene quantum dot (GQD) composites were achieved, which showed a strong dependence of their fluorescence and surface enhanced Raman scattering (SERS) response on the size of the AuNPs. It was indicated that the energy transfer efficiency between the photoexcited GQDs and AuNPs was closely dependent on the size of the AuNPs. Also, according to the comparative SERS response of crystal violet (CV) on Au_x and Au_x/G₆/GQD substrates, it was demonstrated that the electromagnetic field of the AuNPs surface is also strongly dependent on the size of the AuNPs. Meanwhile, the synergetic effect between AuNPs and GQDs was helpful to control the SERS response of the Au_x/G₆/GQD substrate.

中文翻译：

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核-壳状金基纳米复合材料的双功能对金纳米颗粒尺寸的强烈依赖性

在这项工作中，将各种尺寸（Au _x，x = 32、50、68、87和107 nm）的金纳米颗粒（AuNPs）分别与甘氨酸衍生物（G ₆）和石墨烯量子点（GQDs）进行了面组装。随后，获得了新颖的核-壳状Au _x /甘氨酸衍生物（G ₆）/石墨烯量子点（GQD）复合材料，该复合材料显示出它们的荧光强度和表面增强拉曼散射（SERS）响应对纳米颗粒尺寸的强烈依赖性。 AuNPs。结果表明，光激发GQD和AuNPs之间的能量转移效率与AuNPs的大小密切相关。此外，根据比较的SERS，结晶紫（CV）对Au _x和Au _x的响应/ G ₆ / GQD衬底，证明了AuNPs表面的电磁场也强烈依赖于AuNPs的尺寸。同时，AuNP和GQD之间的协同作用有助于控制Au _x / G ₆ / GQD底物的SERS响应。