▎ 摘　　要

NOVELTY - Preparing silver-titanium dioxide graphene composite aerogel comprises e.g. weighing the titanium source into the alcohol solution, stirring and pouring into the mold, allowing to stand, to obtain titanium dioxide wet gel, adding the titanium dioxide wet gel into a container, pouring the aging liquid, aging, adding the aged wet gel into a supercritical drying device for drying, drying to obtain the titanium dioxide aerogel, mixing the titanium dioxide aerogel, silver source and graphene oxide solution, ultrasonically dispersing in the dark, then adding into the hydrothermal reaction kettle, heating and reacting to obtain silver-titanium dioxidegraphene composite wet gel, adding the silver titanium dioxide-graphene composite wet gel into a container, and gel is completely poured into aging liquid, aging, adding the aged wet gel into a freeze drying device for drying, to obtain the silver-titanium dioxidegraphene composite aerogel. USE - The method is useful for preparing silver-titanium dioxide graphene composite aerogel. ADVANTAGE - The aerogel has high specific surface area and SERS hot spot density, and enhances the substrate and the uranium acyl ion and the complex generating charge interaction, improves the polarization rate of SERS substrate; the SERS signal strength of the uranyl ion and complex. DETAILED DESCRIPTION - Preparing silver-titanium dioxide graphene composite aerogel comprises (1) weighing the titanium source into the alcohol solution, stirring and pouring into the mold, allowing to stand, to obtain titanium dioxide wet gel, (2) adding the titanium dioxide wet gel obtained in the step (1) into a container, pouring the aging liquid, aging for 3-5 days, adding the aged wet gel into a supercritical drying device for drying, drying at 260-280 degrees C, the pressure is 8-10 MPa, keeping for 4-6 hours under the constant temperature and pressure state to obtain the titanium dioxide aerogel, (3) mixing the titanium dioxide aerogel obtained in the step (2), silver source and graphene oxide solution, ultrasonically dispersing in the dark, then adding into the hydrothermal reaction kettle, heating and reacting to obtain silver-titanium dioxidegraphene composite wet gel, (4) adding the silver titanium dioxide-graphene composite wet gel obtained in the step (3) into a container, and gel is completely poured into aging liquid, aging for 3-5 days, (5) adding the aged wet gel in the step (4) into a freeze drying device for drying, the drying temperature is -50 degrees C to -60 degrees C, keeping for 36-72 hours under the constant temperature and constant pressure state, to obtain the silver-titanium dioxidegraphene composite aerogel.