Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China.
Nanoscale. 2013 Nov 21;5(22):11200-6. doi: 10.1039/c3nr02527f. Epub 2013 Oct 1.
Carbon dots (CDs) have many fascinating fluorescent properties, however, their low quantum yield limits their applications. In this study, the photoluminescence (PL) of CDs in the vicinity of gold nanoparticles (Au NPs) is enhanced significantly due to the surface plasmon resonance (SPR) of the Au NPs. This is achieved by conjugating Au NPs and CDs to dendrimers (PAMAM) through an amidation reaction, resulting in the formation of the Au-PAMAM-CD conjugates. The maximum 62-fold enhancement was obtained with an optimized molar ratio between Au NPs, PAMAM, and CDs. In this process, PAMAM, which serves as a spacer, can keep Au NPs and CDs at an appropriate distance for PL enhancement. The adjustment of the amount of Au NPs or CDs linked to PAMAM can induce the optimum PL enhancement. This strategy can be easily applied to different metal-space-fluorophore systems to enhance the fluorescence of fluorophores.
碳点（CDs）具有许多迷人的荧光特性，然而，其量子产率低限制了它们的应用。在这项研究中，由于金纳米粒子（Au NPs）的表面等离子体共振（SPR），CDs 在 Au NPs 附近的光致发光（PL）得到了显著增强。这是通过通过酰胺反应将 Au NPs 和 CDs 连接到树枝状聚合物（PAMAM）上来实现的，从而形成了 Au-PAMAM-CD 缀合物。通过优化 Au NPs、PAMAM 和 CDs 之间的摩尔比，可以获得最大 62 倍的增强。在这个过程中，作为间隔物的 PAMAM 可以将 Au NPs 和 CDs 保持在适当的距离以增强 PL。调节与 PAMAM 连接的 Au NPs 或 CDs 的量可以诱导最佳的 PL 增强。该策略可以很容易地应用于不同的金属-空间-荧光团系统，以增强荧光团的荧光。
