<br/>The widespread distribution of herbicides in environment can pose a serious risk to human health and wildlife. Surface-Enhanced Raman Scattering (SERS) is a powerful detection and analysis technique for herbicide detection. However, the development of a low-cost, highly sensitive, reproducible, stable and Raman active nanostructured substrate for herbicide detection is still a particular challenge. In this research nanohybrid gold nanoparticles@carbon nanodots (Au NPs@CNDs) as surface enhanced Raman scattering (SERS) substrate was synthesized by reducing HAuCl<sub>4</sub> with CNDs at 100°C. The optical, chemical, and physical properties of CNDs, Au NPs and Au NPs@CNDs substrates were investigated by the UV-vis spectrometer, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), surface electron microscopy (SEM), and transition electron microscopy (TEM). The SERS effect of the substrates was investigated using Rhodamine 6G (Rh6G), a Raman-active probe, and different kinds of herbicides. The results showed that there was significant increase in SERS spectra of Rh6G and herbicide molecules adsorbed on the Au NPs@CNDs substrate compared to that of bare CNDs and Au NPs. The nanohybrid SERS substrate shows promising application for detection of different kinds of organic compounds in solution phase.

Surface-enhanced Raman scattering (SERS) enhancement using hybrid gold nanoparticles-carbon nanodots substrate for herbicide detection

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