Photonic crystal VOCs sensor and preparation method thereof
A technology of photonic crystals and sensors, applied in chemical instruments and methods, crystal growth, instruments, etc., can solve the problems of zero drift, easy to be affected by the external environment, and low selectivity of VOCs detection devices, achieving obvious response and simple use convenient effect
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[0042] The preparation method of the photonic crystal VOCs sensor provided by the invention comprises: adding methyl cellulose, polyvinyl alcohol and graphene oxide into water to make a mixed solution; filling the mixed solution with a photonic crystal array template and drying; then removing the photonic crystal array template A photonic crystal thin film is obtained; the photonic crystal thin film is coated with a cellulose acetate solution to obtain the photonic crystal VOCs sensor.
[0043] Further, the mass ratio of methyl cellulose and polyvinyl alcohol is 1:(0.25-1). For example, you can choose 1:0.25, 1:0.5, 1:0.8, 1:1, etc.
[0044] In the present invention, if the amount of polyvinyl alcohol is too low, the flexibility and strength of the prepared photonic crystal VOCs sensor will be poor and insufficient, and the problems of incomplete structure and hole collapse will easily occur inside the skeleton; if the amount of polyvinyl alcohol is too high, it will As a res...
Embodiment 1
[0060] A preparation method of a photonic crystal VOCs sensor, comprising:
[0061] (1) Add 50mL of ultrapure water into the reaction vessel, heat to 90°C, then add 1g of polyvinyl alcohol (PVA), stir until completely dissolved, then add 30mg of graphene oxide, fully stir to disperse, and finally add 2g of methyl cellulose element, continue to stir until completely dissolved to obtain a mixed solution;
[0062] (2) Slowly pour 1mL of the mixed solution on the surface of the photonic crystal array template to make it gradually diffuse and fill the gaps between the nanospheres. During the above process, the generation of air bubbles should be strictly avoided; the photonic crystal array after pouring the mixed solution The template is dried in an oven at 30°C, and after drying, the photonic crystal film is peeled off from the glass slide to obtain an opal photonic crystal film;
[0063] (3) Soak the opal photonic crystal film in toluene and shake overnight to obtain the inverse...
Embodiment 2
[0077] A preparation method of a photonic crystal VOCs sensor, comprising:
[0078] (1) Add 50mL of ultrapure water into the reaction vessel, heat to 90°C, then add 0.5g of polyvinyl alcohol (PVA), stir until completely dissolved, then add 30mg of graphene oxide, fully stir to disperse, and finally add 2g of methyl Cellulose, keep stirring until completely dissolved to obtain a mixed solution;
[0079] (2) Slowly pour 1mL of the mixed solution on the surface of the photonic crystal array template to make it gradually diffuse and fill the gaps between the nanospheres. During the above process, the generation of air bubbles should be strictly avoided; the photonic crystal array after pouring the mixed solution The template is dried in an oven at 30°C, and after drying, the photonic crystal film is peeled off from the glass slide to obtain an opal photonic crystal film;
[0080] (3) Soak the opal photonic crystal film in toluene and shake overnight to obtain the inverse opal pho...
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Abstract
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