Functionalization of Ag nanoparticles with the bis-acridinium lucigenin as a chemical assembler in the detection of persistent organic pollutants by surface-enhanced Raman scattering

Preparation of Fe3O4@Ag SERS substrate and its application in environmental Cr(VI) analysis

“…Cr(VI) SERS signal was completely quenched when chloride concentrations increased to above 20 mg L À1 . Some literatures have reported the positive impact of chloride on SERS analysis [37,38], the deactivation effect of chloride was also emphasized in other reports [39,40]. In a recently study, Xu et al [41] demonstrate that 50 mg L À1 chloride can totally quench the SERS spectrum of arsenate.…”

Detection of Persistent Organic Pollutants by Using SERS Sensors Based on Organically Functionalized Ag Nanoparticles

“…Intense SERS features of the pesticide endosulfan at concentrations as low as 10 −6 M can be also seen when the Ag NPs are previously functionalized by the viologen LG [53]. The LOD deduced from this technique is 400 ppb, which is much higher than that observed for PAHs.…”

“…This interaction is stronger than the ionic one occurring in AD-Ag NP systems (Section 5.2.2). Besides, the aromatic nature of LG allows the interaction with aromatic pollutants such as PAHs and, to a lower extent, with chlorinated pesticides [53]. Additionally, LG is able to form intermolecular cavities ( Figure 5.10b), whose dimensions are modulated by the positive residual charge of LG and the rotation of the two acridine moieties to better locate the analyte.…”

α,ω-Aliphatic Diamines as Molecular Linkers for Engineering Ag Nanoparticle Clusters: Tuning of the Interparticle Distance and Sensing Application

“…These bands are mainly assigned to C-Cl vibrations [56,59] and are sensitive to the molecular conformation of the pollutant [60]. In particular, the intense feature at about 400 cm −1 can be attributed to the C-Cl stretching of the Cl-C=C-Cl fragment (i.e., the most electron-donor group of the insecticide molecule), whereas the C-Cl modes appearing at lower frequencies can be assigned to vibrations involving C atoms of less polar portions of the structure [60]. The comparison between the SERS difference spectra of ALD and α-ES, obtained by employing AD 2 , AD 8 , and AD 12 as hosts, and the Raman spectra of the solid pollutants shows an overall similarity (Fig.…”