为了减缓银颗粒氧化从而提高稳定性并维持高信号强度, 采用石墨烯包裹银颗粒, 利用超薄的石墨烯来减缓银颗粒氧化的速度的方法进行了试验研究。试验中, 基底在放置一个月后仍能检测到浓度低至10-11mol/L的R6G溶液。结果表明, 石墨烯的存在使得石墨烯/银颗粒复合结构兼具电磁增强机制和化学增强机制, 提高了基底的检测灵敏度; 基底的增强效果随时间的衰减速度下降了近1倍, 提高了喇曼基底的稳定性。该方法经济简捷, 可以广泛适用于各种银基喇曼基底, 并且不会对基底原本的结构造成破坏。

In order to slow down oxidation of silver particles, improve stability and maintain high signal intensity, silver particles were coated with graphene. An experimental study was carried out to slow down the oxidation rate of silver particles by using ultra-thin graphene. In the experiment, the concentration of R6G solution as low as 10-11mol/L could still be detected after the substrate was placed for one month. The results show that the presence of graphene makes the graphene/silver particle composite structure possess both electromagnetic and chemical enhancement mechanisms. The detection sensitivity of the substrate is improved. The enhancement effect of the basement has nearly doubled with the decay rate of time. The stability of Raman substrate is improved. This method is economical and simple. It can be widely applied to various silver-based Raman substrates and will not destroy the original structure of the base.