Luo Yanghe, Ma Lu, Zhang Xinghui, Liang Aihui, Jiang Zhiliang
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection of Ministry Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guangxi Normal University, Guilin, 541004, China,
Nanoscale Res Lett. 2015 Dec;10(1):937. doi: 10.1186/s11671-015-0937-9. Epub 2015 May 27.
The reduced graphene oxide/silver nanotriangle (rGO/AgNT) composite sol was prepared by the reduction of silver ions with sodium borohydride in the presence of H2O2 and sodium citrate. In the nanosol substrate, the molecular probe of acridine red (AR) exhibited a weak surface-enhanced Raman scattering (SERS) peak at 1506 cm(-1) due to its interaction with the rGO of rGO/AgNT. Upon addition of dopamine (DA), the competitive adsorption between DA and AR with the rGO took place, and the AR molecules were adsorbed on the AgNT aggregates with a strong SERS peak at 1506 cm(-1) that caused the SERS peak increase. The increased SERS intensity is linear to the DA concentration in the range of 2.5-500 μmol/L. This new analytical system was investigated by SERS, fluorescence, absorption, transmission electron microscope (TEM), and scanning electron microscope (SEM) techniques, and a SERS quantitative analysis method for DA was established, using AR as a label-free molecular probe.
通过在过氧化氢和柠檬酸钠存在下用硼氢化钠还原银离子制备了还原氧化石墨烯/银纳米三角形（rGO/AgNT）复合溶胶。在纳米溶胶基质中，由于吖啶红（AR）与rGO/AgNT的rGO相互作用，其分子探针在1506 cm⁻¹处表现出较弱的表面增强拉曼散射（SERS）峰。加入多巴胺（DA）后，DA与AR在rGO上发生竞争吸附，AR分子吸附在AgNT聚集体上，在1506 cm⁻¹处出现强SERS峰，导致SERS峰增强。在2.5 - 500 μmol/L范围内，增加的SERS强度与DA浓度呈线性关系。利用SERS、荧光、吸收、透射电子显微镜（TEM）和扫描电子显微镜（SEM）技术对该新型分析系统进行了研究，并以AR作为无标记分子探针建立了DA的SERS定量分析方法。
