Halogen ion‐modified silver nanoparticles for ultrasensitive surface‐enhanced Raman spectroscopy detection of polycyclic aromatic hydrocarbons

Abstract

Rapid ultrasensitive detection of trace polycyclic aromatic hydrocarbons (PAHs) is essential and significant for pollution control due to their hazard, persistence, and the wide distribution in the environment. Therefore, rapid detection of PAHs is critical for controlling pollution and protecting the ecology. Considering the advantages of surface-enhanced Raman spectroscopy (SERS), a simple and reliable SERS method was proposed in this work for detecting PAHs in water. Three chemicals, namely NaCl, KBr, and KI, were chosen to modify Ag nanoparticles (NPs) for phenanthrene (Phe) detection, and Ag NPs modified with KBr (Ag-Br NPs) showed the best SERS response. The mixing sequence and the concentration of KBr were optimized. The addition order of mixing KBr and Ag NPs before Phe solution was the best sequence, and the optimal concentration of KBr was 20 mM. Under optimal conditions, the limits of quantification for Phe, pyrene (Pyr), and anthracene (Ant) were 10 À6 M, 10 À7 M, and 10 À7 M, respectively. Mixed PAHs (Phe, Pyr, and Ant) in spiked water samples were identified and quantified successfully. The proposed method has good application prospects in environmental pollution monitoring.

Iodine-Modified Ag NPs for Highly Sensitive SERS Detection of Deltamethrin Residues on Surfaces

“…Halide ions were considered effective co-adsorbates to enhance the SERS sensitivity, and many groups, including us [ 24 , 25 ], had been working in this field intensively. For example, polycyclic aromatic hydrocarbons [ 26 ], antibiotics [ 27 ], drugs [ 28 ] have been shown to enhanced SERS signals in the presence of certain halogen ions. Simultaneously, the mechanism of co-adsorbates enhanced SERS sensitivity was also investigated.…”