Fabrication Of Sampling-inspection Integrated Substrate Based On Composite Gold And Silver Nanoparticles For Surface Enhanced Raman High-efficiency On-site Inspection Application

With the prosperity of agriculture and commerce,the output of agricultural products is very dependent on the use of pesticides.The extensive use of pesticides has increased the probability of pesticide residues in agricultural and sideline products.Worldwide,pesticide residues damage the health of people.Events happen from time to time.Efficient and rapid detection of whether pesticide residues in complex agricultural products exceed the standard is a problem that needs to be solved urgently in today's social development.Raman spectroscopy technique is sensitive,fast,and immune to water solvents.Many researchers use the principle of surface-enhanced Raman spectroscopy to prepare a series of surface-enhanced Raman substrates with various good properties in order to achieve good applications in various fields.In this article,for the problem of efficient on-site detection of complex systems,using the signal enhancement principle of surface-enhanced Raman,by modifying precious metal nanoparticles with surface-enhanced Raman effect on a substrate with an ordered 3D structure,the preparation can be achieved quickly The detected surface enhances the Raman substrate.1.To solve the problem of irregular surface of the test object,we used the seed growth method on the surface of aluminum foil paper to construct an ordered 3D structure of ZnO nanosheets,and modified the nanoparticles of silver and gold on the surface of ZnO nanosheets to construct The "hot spot" of the Raman signal enhancement effect,thus obtaining a 3D-SF substrate.The substrate not only has good sensitivity,uniformity and stability,but also realizes the simulated detection of the Familia on the surface of the actual sample tomato and apple.It also realizes the reusability of the substrate through the principle of photocatalysis.2?For the problem that the inside of the test object is not easy to detect directly and the sample preparation is complicated,we use the electrochemical corrosion method to corrode the fine silver needle to build a silver 3D nanostructure with surface enhanced Raman effect The ion sputtering method sputters a layer of gold nanoparticle solid phase micro-extraction coating on the surface of the substrate,which effectively protects the silver substrate from oxidation and can extract the test object.The substrate has good surface enhancement of the conventional performance of the Raman substrate,and successfully achieved the detection of malachite green in crucian carp,and has a good linear relationship within a certain range.