Preparation method and application of silver nano flower clusters/silver micro pieces of graded structures

Abstract

The invention relates to a preparation method and application of silver nano flower clusters / silver micro pieces of graded structures. The preparation method comprises the steps that silver nitrate and polyvinylpyrrolidone are added into deionized water according to the mass ratio of 0.5:(3-10) and then stirred till the silver nitrate and the polyvinylpyrrolidone are completely dissolved; then a sodium borohydride solution is added rapidly, and stirring and standing are conducted, so that silver seed crystals are obtained; and the clean surface of an aluminum sheet is spin-coated with the silver seed crystals through a spin coating instrument; and the aluminum sheet spin-coated with the silver seed crystals is placed in a mixed deposition solution for a standing reaction for at least 120 minutes, then in-situ growth of the silver nano flower clusters / silver micro pieces of the graded structures on the surface of the aluminum sheet is achieved, and the aluminum sheet with the silver nano flower clusters / silver micro pieces of the graded structures can serve as a substrate for surface enhanced raman scattering spectrum detection of a low-concentration electrolyte additive, namely 1,3-propane sultone. The preparation method is simple, the cost is low, and the preparation cycle is short; and in addition, the silver nano flower clusters / silver micro pieces with the same morphology are evenly distributed on the surface of the aluminum sheet, and the good SERS signal uniformity and repeatability of the substrate are guaranteed.

Description

technical field [0001] The invention relates to the field of analysis technology, in particular to a preparation method of hierarchically structured silver nanoflower clusters / silver microsheets and its application to low-concentration detection of electrolyte additive 1,3-propane sultone. Background technique [0002] At present, the component analysis of lithium-ion battery electrolyte additives is mainly based on traditional gas chromatography, gas chromatography / mass spectrometry, and high performance liquid chromatography. Although these detection methods can realize the detection of electrolyte additives in the laboratory, the extraction and pretreatment process of the sample is relatively cumbersome, the detection time is long, and it is not suitable for in-situ and on-site rapid analysis. Surface-enhanced Raman scattering spectroscopy (SERS) technology is one of the most sensitive analytical techniques with rapid, high-sensitivity, and fingerprint-identifying detec...

AI Technical Summary

Problems solved by technology

Researchers have used metals such as zinc, copper, and iron to prepare silver micro-nano-structured SERS substrates with various morphologies, such as replacing silver nitrate with zinc flakes or copper flakes, without adding surfactants. Silver dendrites or flower cluster micro-nano structures were prepared (Appl. Phys. Lett. 89 (2006) 173104-173103; Chem. Commun. (2008) 2692-2694), although these dendrite or flower cluster structures have good SERS activity, but the homogeneity of the structure of silver branches or flower clusters cannot be guaranteed, so the repeatability of the SERS signal cannot be guaranteed; Professor Sun Yugang from the Argonne National Laboratory in the United States used the reaction between the semiconductor gallium arsenide and silver nitrate to prepare Large-area silver nanosheet arrays (Small, 3 (2007), 1964-1975), this preparation method is simple, but the density of the silver nanosheets with rough surface is relatively small and the size of the nanosheets is not uniform, so it cannot Guaranteed SERS activity of silver nanosheet substrates

Therefore, the current silver nanostructures prepared based on the replacement reaction are not conducive to the actual detection of SERS technology.

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