The Controllable Synthesis Self-assemble And Applications For Surface Enhanced Raman Spectroscopy Of Silver Nanomateial

The nanomaterials with unique physical, chemical and mechanical properties that thebulk materials without. These nanomaterials have grate application prospects in the fields ofoptical, electrical, magnetism, catalysis and biosensor etc. The Ag nanomaterial has attractedmuch attention because of the highest electric and thermal conductivity, superior opticalcharacteristics and unique surface plasmon features, especially the Ag nanomaterial hasexhibited application potential as active substrates for surface enhanced Raman scattering(SERS). To this day, the researches about the relationship of Ag nanomaterial and the SERSperformance remain meaningful. In this paper, we analyzed the factors for Ag nanomaterialbase used for Raman enhancement though varied methods and the main works and principalresults were discussed as follows:1, In order to explore the shapes of Ag nanomaterial impact on the SERS performance,we synthesized these Ag nanomaterial (0-dimensional Ag nanoparticles,1-dimensional Agnanowires,2-dimensional Ag nanosheets and3-domensional Ag nanocubes) by the chemicalreduction method. These nano-materials were self-assembled via the interface assemblyprocedure to form ordered silver nano-arrays. We analyzed the SERS spectra of rhodamine6G (R6G) molecules absorbed on these Ag nano-arrays and calculated the contributions ofdifferent crystal planes on the Raman enhancement with the analyzing of XRD results andprovided a new explain to the chemical enhancement of SERS.2, The study of self-assembly impact on the SERS performance. The ultrathin Ag NWswere self-assembled to form well-defined periodic Ag nanostructures by a water-oil-air-solidfour-phase interface procedure. A comparison on SERS spectra of rhodamine B moleculesabsorbed on ordered Ag NWs and non-ordered Ag NWs was made to explore the influence ofAg NWs assembly on the SERS enhancement. Finally, we explored the application of the AgNWs films analysis of the filed of food safety.3，Zeolitic imidazolate framework-90(ZIF-90) crystal membrane were prepared. Thensilver nanoparticles (Ag NPs) were hosted on the ZIF-90crystal membrane to formAg/ZIF-90self-assembled membrane. Rhodamine6G (R6G) was used as a detectionmolecule to test the SERS performance of Ag/ZIF-90self-assembled membrane. The SERSsignal of R6G on Ag/ZIF-90self-assembled membrane has excellent performance. TheAg/ZIF-90self-assembled membrane was a promising active SERS substrate, which can be applied in the trace detection of pesticide residue.4, We could improve the detection results by enriching the target molecules from a lowconcentration solutions to the detection zones. Inspired by the abilities of thesuperhydrophobic property of lotus leaf, the pattern with hydrophilic-hydrophobic wasfabricated.This device was used to realize high-sensitive ultratrace detection of SERS analytes.Coupled with the Raman enhancement effect of the Ag nanomaterls, the limit of detection wasfurther improved.