Preparation method and application of Ag@NGO composite nano-material
A composite nanomaterial and solution technology, applied in the field of Ag@NGO composite nanomaterial preparation, can solve the problems of inability to achieve surface-enhanced Raman applications, and achieve the effect of improving performance and reducing production costs
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Embodiment 1
[0031] Embodiment 1 A preparation method of Ag@NGO composite nanomaterials, comprising the following steps:
[0032] (1) Graphene oxide (GO) solution was prepared by Hummers method improvement method, GO solution was added to nitric acid solution (10% 200mL) and condensed and refluxed at 80°C for 24h, and then centrifugally cleaned with deionized water; the obtained solution was ultrasonically crushed for 6h , filter with filter membrane to obtain nanometer graphene oxide solution (NGO);
[0033] The centrifugal cleaning with deionized water refers to centrifuging to remove the supernatant, adding deionized water and centrifuging until the pH is neutral; the ultrasonic crushing is preferably a probe with a diameter of 15mm and a power of 400w. The filter diameter is 220nm. (like figure 1 shown)
[0034] (2) Mix and stir the aforementioned 10mL nanometer graphene oxide solution (0.5mg / mL) and 10mL0.02M silver nitrate solution under ice bath conditions, and inject 10mL20mM so...
Embodiment 2
[0035] Embodiment 2 A preparation method of Ag@NGO composite nanomaterials, comprising the following steps:
[0036] (1) Graphene oxide (GO) solution was prepared by Hummers method improvement method, GO solution was added to nitric acid solution (10% 200mL) and refluxed at 80°C for 24h, then centrifugally cleaned with deionized water; the obtained solution was ultrasonically crushed for 7h , filter with filter membrane to obtain nanometer graphene oxide solution (NGO);
[0037] The centrifugal cleaning with deionized water refers to centrifuging to remove the supernatant, adding deionized water and centrifuging until the pH is neutral; the ultrasonic crushing is preferably a probe with a diameter of 15mm and a power of 400w. The filter diameter is 220nm.
[0038] (2) Mix and stir the aforementioned 10mL nanometer graphene oxide solution (0.5mg / mL) and 10mL0.02M silver nitrate solution under ice bath conditions, and inject 10mL20mM sodium borohydride solution evenly at a spee...
Embodiment 3
[0039] Embodiment 3 A method for preparing a paper-based SERS "chip", comprising the following steps:
[0040] Cut ordinary filter paper into a square of 20mm×20mm, take 2mL of the Ag@NGO (1mg / mL (concentration can be adjusted)) aqueous solution in Example 1, centrifuge it through a centrifuge at 8000r / min for 5 minutes, remove the supernatant, and add ethylene glycol Alcohol to make 3mL Ag@NGO ethylene glycol solution, add 1mL carboxymethyl cellulose aqueous solution (4%, Wt%) to increase the viscosity, make 4mL Ag@NGO paste as screen printing raw material. A circular pattern array with a diameter of 5 mm and a thickness of 50 μm was printed using a screen printing machine with ordinary filter paper as the supporting substrate. Take out the array, dry the entire filter paper at 60°C, cut it into a square with a side length of 2cm and paste it on a glass slide to make a paper-based Ag@NGO SERS "chip". The resulting paper-based SERS "chip" circular pattern, namely Ag@NGO, is t...
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