Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
School of Energy and Chemical Engineering, UNIST , Ulsan 44919, Republic of Korea.
ACS Appl Mater Interfaces. 2016 Aug 10;8(31):20379-84. doi: 10.1021/acsami.6b05710. Epub 2016 Jul 26.
Dendrimer-stabilized gold nanoparticles (Au-Den) were prepared by a facile solution based method for a highly reliable and robust surface enhanced Raman scattering (SERS) substrate. Au-Den was selectively attached on the surface of reduced graphene oxide (rGO) by noncovalent interactions between the Au capping dendrimer and the graphene surface. Au-Den/rGO exhibits the outstandingly stable and highly magnified Raman signal with an enhancement factor (EF) of 3.9 × 10(7) that enables detection of R6G dyes with concentration as low as 10 nM, retaining 95% of the Raman signal intensity after 1 year. The remarkable stability and enhancement originated not only from a simple combination of the electromagnetic and chemical mechanism of SERS but also from intensified packing density of stable Au-Den on the graphene substrate due to the firm binding between the dendrimer capped metal nanoparticles and the graphene substrate. This method is not limited to the gold nanoparticles and G4 dendrimer used herein, but also can be applied to other dendrimers and metal nanoparticles, which makes the material platform suggested here superior to other SERS substrates.
树枝状聚合物稳定的金纳米粒子 (Au-Den) 通过简便的基于溶液的方法制备，作为一种高可靠性和强鲁棒性的表面增强拉曼散射 (SERS) 基底。通过 Au 封端树枝状聚合物与石墨烯表面之间的非共价相互作用，Au-Den 被选择性地附着在还原氧化石墨烯 (rGO) 的表面上。Au-Den/rGO 表现出出色的稳定性和高度放大的拉曼信号，增强因子 (EF) 高达 3.9×10(7)，能够检测到浓度低至 10 nM 的 R6G 染料，并且在 1 年后保留了 95%的拉曼信号强度。这种显著的稳定性和增强不仅源于 SERS 的电磁和化学机制的简单结合，还源于由于纳米颗粒与石墨烯基底之间的牢固结合，稳定的 Au-Den 在石墨烯基底上的密集堆积密度得到了增强。该方法不仅限于本文中使用的金纳米颗粒和 G4 树枝状聚合物，还可以应用于其他树枝状聚合物和金属纳米颗粒，这使得所提出的材料平台优于其他 SERS 基底。
