Precious metal nano particle-porous graphite composite material and preparation method and application thereof

Abstract

The invention discloses a precious metal nano particle-porous graphite composite material and a preparation method and an application thereof. The material is prepared by decorating precious metal particles on the hole wall of porous graphite with the hole diameter in a range of 50nm to 100 microns, wherein the precious metal particle diameters is in a range of 1nm to 500nm and is one or a mixture of more than two of gold, silver, platinum and palladium. The method comprises dispersing the precious metal particles, the graphene oxide and deionized water, according to a weight ratio of (0.1-1): (0.01-0.1): (1000-70000), into the deionized water uniformly to obtain a dispersion solution; adding an excessive sodium borohydride solution into the dispersion solution, wherein the weight ratio of the graphene oxide in the sodium borohydride solution to the graphene oxide in the dispersion solution is (1-10): (0.1-1), and standing the mixture for at least 1h to prepare the precious metal nano particle-porous graphite composite material. The precious metal nano particle-porous graphite composite material can be used as a surface enhancement raman scattering active substrate, and the content of rhodamine 6G, polychlorinated biphenyl (PCB-3) or parathion-methyl attached to the precious metal nano particle-porous graphite composite material is measured through a laser Raman spectrometer.

Description

technical field [0001] The invention relates to a composite material and its preparation method and application, in particular to a noble metal nanoparticle-porous graphene composite material and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy is a promising analytical technique due to its high sensitivity, fast response, and fingerprint information of molecular vibrations. As one of the main advantages of SERS detection technology, high sensitivity mainly relies on high-density SERS hotspots. In order to make full use of the SERS hot spot to enhance the Raman signal, the analyte must be located at the hot spot, that is, the SERS substrate must be able to firmly adsorb or capture the analyte. Ordinary SERS substrates have high sensitivity to organic molecules that are easily adsorbed by noble metals, but have low sensitivity to organic molecules that are not easily adsorbed by noble metals. To solv...

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Problems solved by technology

Although this two-dimensional composite structure can detect rhodamine 6G in water, it cannot detect organic pollutants in water, especially the persistent organic pollutant polychlorinated biphenyl PCB-3 and the organic phosphorus pesticide methyl parathion in water

This is because, on the one hand, the prepared high-quality graphene is super-hydrophobic, and it is difficult to contact organic pollutants in water, so it is impossible to achieve efficient adsorption of organic substances in water; on the other hand, as a dye, rhodamine 6G can The adsorption capacity of organic pollutants is very strong and can be adsorbed on the surface of hydrophilic noble metal nanoparticles, while the adsorption capacity of organic pollutant molecules is very poor and cannot be adsorbed on noble metal nanoparticles.

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