Au@SiO_2颗粒对石墨烯量子点拉曼信号的增强作用

Raman signal enhancement of graphene quantum dots using gold nanoparticles coated with silica as an amplifier

采用金纳米颗粒包覆了一层二氧化硅壳层作为实验材料,利用该核壳材料增强石墨烯量子点的拉曼信号,并实现了单颗粒增强.实验中,二氧化硅的厚度可以通过反应时间得到控制,该壳层可以增强金纳米颗粒的化学和物理稳定性.本文方法与使用纯金纳米颗粒增强石墨烯量子点拉曼信号相比,其拉曼信号强度增强了20%以上.

This paper reports the Raman signal enhancement of graphene quantum dots using Au@ SiO2 composite nanoparticles as Raman signal amplifier. The thickness of silica shells can be well- designed by controlling the reaction time. And the silica shell can improve the chemical, mechani- cal and physical stability of gold nanoparticles. The Raman signal intensity of graphene quantum dots increases more than 20% compared with using pure gold nanoparticles as amplifier.