Nanoplasmonic Au/Ag/Au nanorod arrays as SERS-active substrate for the detection of pesticides residue

摘要

Highlights ? Well-ordered Au nanocavity and Au/Ag/Au nanorods (NRs) array are fabricated by nano-indentation and focused ion beam methods. ? The embedded Ag layer on NR surface affects the SERS effect, which can detect a low concentration of R6G. ? Optimized SERS-active substrate was applicable to detect various types of pesticides' residue. Abstract Trace analysis of pesticides’ residue found in an agricultural product is a vital topic, which is still a time-consuming and unreliable approach. A fast and effective chemical sensing technique is therefore required. Surface-enhanced Raman spectroscopy (SERS) has been well developed f