Preparation Of Renewable SERS Substrate Based Nanorods And Its Development In Substance Detection

Surface-enhanced Raman scattering(SERS)refers to the phenomenon that the Raman signal of materials are adsorbed or near the surface of a particular metal,and is widely used in biological and environmental testing.The key to SERS technology is to prepare substrates with SERS activity.The reproducible SERS substrate is a substrate that can be reused.It has the advantages of low cost and rapid preparation,and gradually attracted people’s attention.Because the zinc oxide nanorods have a large specific surface area,more metal nanoparticles can be adsorbed and further enhance the SERS effect.At the same time,the zinc oxide nanorods have the characteristics of photocatalysis,which can catalyze the degradation of the sample under the irradiation of the UV lamp and make the substrate clean and reuse.So zinc oxide is widely used in the preparation of renewable SERS substrate.In this paper,zinc oxide nanorods were prepared by hydrothermal method,and SERS substrates were prepared by modifying silver nanoparticles on-line.The SERS activity and reproducibility were identified by the SERS reporters,such as rhodamine(R6G),nail blue(NB),4-mercaptobenzoic acid(4MBA),5,5’-dithiobis(2-nitrobenzoic acid)(DTNB).On the other hand,with the development of industry,mercury and other heavy metal ions pollution is also increasingly serious.Mercury ions are extremely harmful to human health and the environment,so to achieve the detection of mercury ions is extremely urgent.In this paper,mercury ions were detected in the term of sensitivity and specificity by the organic molecules named PY-crown-18,combined with fluorescence and SERS technique,and the effects of ethanol on the fluorescence and SERS of PY solution were studied.