Composite material of graphene oxide/ nanometer precious metal with surface enhanced Raman effect and preparation thereof

Abstract

The invention discloses a preparation method of a composite material of graphene oxide / nanometer precious metal with a surface enhanced Raman effect. The preparation method comprises the following steps of: dispersing the graphene oxide into alcoholic solution of silane coupling agent; reacting to obtain a graphene oxide material grafted by the silane coupling agent; mixing the graphene oxide material with precious metalsol according to a certain proportion; and adsorbing and gathering precious metal nano-particles on the surface of graphene oxide to form the composite material of graphene oxide / nanometer precious metal. The method is simple to operate and has moderate reaction condition, and the size, the shape and the ingredients of the precious metal nano-particles can be adjusted flexibly. The invention simultaneously discloses the composite material of graphene oxide / nanometer precious metal prepared by the method, and the material has good water-solubility, large specific surface area, and can enrich target molecules in water to realize ultra-sensitive detection.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a graphene oxide / nano precious metal composite with surface-enhanced Raman effect. Background technique [0002] Raman spectroscopy can provide detailed structural information about the characteristic groups and stacking modes of molecules, and is not affected by solvent water. It can also select different wavelengths of excitation light according to different characteristics of the sample. As a conventional analysis and testing technology, it has It is widely used in the qualitative and quantitative analysis of chemical molecules. However, the Raman scattering cross-sectional area is small, requiring a relatively high concentration of the detected substance. [0003] Surface-enhanced Raman scattering (SERS) is a surface optical effect, and its discovery greatly improves the sensitivity of Raman spectroscopy: when molecules are adsorbed on the surface of nanoscale noble metals, due ...

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Problems solved by technology

[0004] The Chinese patent with the publication number CN102285629A discloses a method for preparing a surface-enhanced Raman spectroscopy active substrate, which includes spreading a single-layer polystyrene nano-bead array on the water surface, and using reactive plasma etching technology to prepare spaced polystyrene Nano-bead arrays are used to prepare surface-enhanced Raman spectroscopy active substrates. The substrates prepared by this method have high uniformity, but the preparation method is more complicated, and the enhancement of Raman spectroscopy signals is not obvious

[0005] The Chinese patent with the publication number CN102507530A discloses a method for preparing nano-silver surface-enhanced Raman spectroscopic substrates by gamma radiation. In this method, the glass substrate is placed in a radiation solution and irradiated with gamma-rays to obtain nano-silver surface-enhanced Raman spectroscopy. Spectral substrate, the preparation method of the substrate is simple, but the enhancement of the Raman spectral signal is not obvious enough

[0006] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, which has unique physical and chemical properties. Applying graphene to the enhancement of Raman signals will have better results (green surface-enhanced Raman spectroscopy technology based on graphene ; Xu Weigao, Ling Xi, Zhang Jin; Abstracts of 2011 China Materials Symposium; 2011, P441), but there are strong intermolecular forces between the layers of graphene, it is difficult to stably disperse in solvents, and the surface It is inert and difficult to modify the surface, these factors limit its application in the field of Raman spectroscopy enhancement

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