Citrate-assisted galvanic replacement for fabrication of homogeneous Ag nanosheets as high-performance SERS substrate

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

“…The resonance Raman signal was found using 5 × 10 −2 mol/L R6G solution on the blank PI substrate. For practical applications, an efficient SERS substrate should possess not only a large number of "hot spots" to ensure high sensitivity but also the uniform distribution of "hots pots" to achieve good signal reproducibility [46,47]. Therefore, as shown in Figure 4(g), the 15 randomly selected locations on the Ag film/ Ag nanoparticles/Mo-25.5 at% Ag films immersed in the 5 × 10 −8 mol/L R6G solution and naturally air-dried were measured to evaluate the uniformity and reproducibility of the SERS substrate.…”

Suitability study of Ag nanosheet SERS substrates as a screening method for imidacloprid after QuEChERS extraction

“…Silver nanosheets (AgNS) were synthesized by a process described by Li et al 48 using silver nitrate (AgNO 3 , 20 mM), sodium citrate (7 mM), and different reaction times (0.5, 1, 2, 5, and 10 min). The UV-vis absorption spectra were recorded using a spectrophotometer (UV-2450, Shimadzu), and the substrates were morphologically characterized by scanning electron microscopy (SEM, FEI Quanta 250), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD, Bruker D8 Advance X-ray diffractometer).…”

“…The enhancement factor (EF) is a parameter that allows us to quantify the magnitude of the improvement that a SERS substrate presents; this is calculated from the following equation: 47,48,55 EF ¼…”

“…This value depends on the surface affinity of the probe molecule and is consistent with what has been reported in the literature for the AgNS platform. 48…”

Two-Dimensional Metal Nanostructures: From Theoretical Understanding to Experiment

“…Templates normally have two key functions for anisotropic growth: (1) they possess specific active sites that can interact with metal precursors or reduced intermediates and (2) the structure of these templates can accommodate metal precursors or spatially confine the growth of metal materials in certain direction. Popular materials serving as 2D templates or substrates include lamellar micelles, ,,,,,− various 2D carbon materials such as graphite, ,, GO, − and graphene, , biomolecules, ,− ionic liquids, − polymers, ,− and metals. ,− Templated 2D nanostructures can also form at liquid–liquid − and solid–liquid interfaces.…”