Based on time and spatial-resolved SERS mapping strategies for detection of pesticides.

摘要: Abstract For the sensitive and convenient detection of pesticides, several sensing methods materials have been widely explored. However, it is still a challenge to obtain sensitive, simple techniques for pesticides. Here, Time-resolved SERS mapping (T-SERS) Spatial-resolved (S-SERS) are presented pesticides by using Au@Ag NPs as substrate. The based on state translation nanoparticles from wet dry realize measurements. During measurement, adhesive force drives particles closer together then average interparticle gap becomes smaller. Following, air begins intersperse into liquid network held forces at solid-liquid-air interface. In late stage water evaporation, all uniformly distributed. Thus, so called hotspots matrix that can hold between every two adjacent in efficient space with minimal polydispersity particle size achieved, accompanying red-shift surface plasmon peak appearance an optimal SPR resonated sharply excitation wavelength. we found T-SERS method exhibits limits 1–2 orders magnitude higher than S-SERS. On other hand, very high sensitivity, better reproducibility (RSD=10.8%) beneficial construction calibration curve comparison (S-SERS). Most importantly, result its remarkable strategies applied detect limit down 1 nM paraoxon, 0.5 nM sumithion. short, measurement promises open market practical prominent advantages.