Ag/TiS2 layered composite substrate with SPR having strong SERS activity in near infrared and preparation method of Ag/TiS2 layered composite substrate
A composite substrate, near-infrared technology, applied in coatings, analytical materials, material excitation analysis, etc., can solve problems such as Raman scattering activity limitation, and achieve the effect of short experimental period and simple preparation method.
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[0020] The technical solution of the present invention will be further explained and described in the manner of specific embodiments below.
[0021] (1) Clean the silicon wafer. Cut the silicon wafer into 2×2cm 2 Put the small silicon chip into a beaker, and add a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6 into the beaker. Place the beaker on a scorching table and heat it to boiling, and keep it for 5-10 minutes. After cooling, pour out the liquid, and alternately use deionized water and absolute ethanol to repeatedly sonicate for 15 minutes.
[0022] (2) Preparation of hexagonal close-packed polystyrene bead arrays. Polystyrene beads with a diameter of 200nm and absolute ethanol are mixed at a volume ratio of 1:1, and the polystyrene beads are evenly dispersed by ultrasonic treatment, and the dispersed polystyrene beads are dropped on the large block with a pipette gun. Silicon wafers, so that the dispersion liquid i...
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