Photonic crystal thin film as well as preparation method and application thereof

Abstract

The invention discloses a photonic crystal thin film as well as a preparation method and application thereof. The photonic crystal thin film comprises Fe3O4 nanoparticles and polyacrylamide hydrogel, and the Fe3O4 nanoparticles are uniformly dispersed in the 1mg / ml-50 mg / ml polyacrylamide hydrogel. The preparation method comprises the following steps: (1) uniformly dispersing Fe3O4 nanoparticles, acrylamide, methene acrylamide and photon initiator into an organic solution, to obtain a hydrogel photon crystal suspension; (2) paving the hydrogel photon crystal suspension into a 150-300mu m thin film, loading a magnetic field of 300-2000 gaussian so as to develop the thin film, and then curing; and (3) soaking the cured crystal thin film in water, and replacing the organic solvent, thus obtaining the photonic crystal thin film. The thin film has sensitive solvent response and mechanical response capability, the preparation is fast, and the photonic crystal thin film can be used for naked-eye detection.

Description

technical field

[0001] The invention belongs to the field of photonic crystal materials, and more specifically relates to a photonic crystal thin film, its preparation method and application. Background technique

[0002] Photonic crystals are a periodic structure composed of materials with different refractive indices alternately in space. The most fundamental feature of photonic crystals is that they have a photonic forbidden band, that is, light falling in the forbidden band is prohibited from propagating. Due to their unique optical properties, photonic crystals are widely used in the fields of preparation and coding materials of various optical devices (such as modulators, sensors, displays, etc.).

[0003] Nanoparticles can self-assemble through volatilization to form photonic crystal films under the gravitational field. Although the preparation process of this method is simple, the preparation cycle is long, polycrystalline state is easily formed, the obtained photon...

Examples

preparation example Construction

[0029] The photonic crystal thin film provided by the invention, its preparation method, comprises the following steps:

[0030] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in the organic solution to obtain a suspension of the hydrogel photonic crystal precursor, so that Fe in each milliliter of photonic crystal hydrogel precursor 3 o 4 1 mg to 50 mg of nanoparticles, 100 mg to 600 mg of acrylamide, 1 mg to 20 mg of methylene acrylamide, and 0.1 mg to 1 mg of photoinitiator; the organic solvent is ethylene glycol, and its function is to prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0031] The Fe 3 o 4 Nanoparticles are prepared according to the following method: dissolving ferrocene and hydrogen peroxide in acetone to obtain a solution, so that the concentration of ferrocene in the solution is between 0.001 mg / ml and 0.05 mg / ml, and...

Embodiment 1

[0038] A photonic crystal thin film is prepared according to the following method:

[0039] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in ethylene glycol by ultrasonic dispersion method to obtain a suspension of hydrogel photonic crystal precursor, so that each milliliter of photonic crystal hydrogel precursor Contains Fe 3 o 4 Nanoparticles 1mg, acrylamide 100mg, methylene acrylamide 1mg, photoinitiator 0.1mg; ethylene glycol as an organic solvent can prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0040] The Fe 3 o 4 Nanoparticles are prepared as follows: dissolve ferrocene and hydrogen peroxide in 75ml of acetone, and add the solution to a 100mL stainless steel reaction kettle, so that the concentration of ferrocene in the solution is 0.001mg / ml, and the concentration of hydrogen peroxide is 0.01mg / ml; react at 100°C for 10 hou...

Embodiment 2

[0046] A photonic crystal thin film is prepared according to the following method:

[0047] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in ethylene glycol by ultrasonic dispersion method to obtain a suspension of hydrogel photonic crystal precursor, so that each milliliter of photonic crystal hydrogel precursor Contains Fe 3 o 4 Nanoparticles 2mg, acrylamide 300mg, methylene acrylamide 4.5mg, photoinitiator 0.22mg; ethylene glycol as an organic solvent can prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0048] The Fe 3 o 4 Nanoparticles are prepared as follows: dissolve ferrocene and hydrogen peroxide in 75ml of acetone, and add the solution to a 100mL stainless steel reaction kettle, so that the concentration of ferrocene in the solution is 0.0023mg / ml, and the concentration of hydrogen peroxide is 0.025mg / ml; react at 200°C for 2...

technical field

[0001] The invention belongs to the field of photonic crystal materials, and more specifically relates to a photonic crystal thin film, its preparation method and application. Background technique

[0002] Photonic crystals are a periodic structure composed of materials with different refractive indices alternately in space. The most fundamental feature of photonic crystals is that they have a photonic forbidden band, that is, light falling in the forbidden band is prohibited from propagating. Due to their unique optical properties, photonic crystals are widely used in the fields of preparation and coding materials of various optical devices (such as modulators, sensors, displays, etc.).

[0003] Nanoparticles can self-assemble through volatilization to form photonic crystal films under the gravitational field. Although the preparation process of this method is simple, the preparation cycle is long, polycrystalline state is easily formed, the obtained photon...

Examples

preparation example Construction

[0029] The photonic crystal thin film provided by the invention, its preparation method, comprises the following steps:

[0030] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in the organic solution to obtain a suspension of the hydrogel photonic crystal precursor, so that Fe in each milliliter of photonic crystal hydrogel precursor 3 o 4 1 mg to 50 mg of nanoparticles, 100 mg to 600 mg of acrylamide, 1 mg to 20 mg of methylene acrylamide, and 0.1 mg to 1 mg of photoinitiator; the organic solvent is ethylene glycol, and its function is to prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0031] The Fe 3 o 4 Nanoparticles are prepared according to the following method: dissolving ferrocene and hydrogen peroxide in acetone to obtain a solution, so that the concentration of ferrocene in the solution is between 0.001 mg / ml and 0.05 mg / ml, and...

Embodiment 1

[0038] A photonic crystal thin film is prepared according to the following method:

[0039] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in ethylene glycol by ultrasonic dispersion method to obtain a suspension of hydrogel photonic crystal precursor, so that each milliliter of photonic crystal hydrogel precursor Contains Fe 3 o 4 Nanoparticles 1mg, acrylamide 100mg, methylene acrylamide 1mg, photoinitiator 0.1mg; ethylene glycol as an organic solvent can prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0040] The Fe 3 o 4 Nanoparticles are prepared as follows: dissolve ferrocene and hydrogen peroxide in 75ml of acetone, and add the solution to a 100mL stainless steel reaction kettle, so that the concentration of ferrocene in the solution is 0.001mg / ml, and the concentration of hydrogen peroxide is 0.01mg / ml; react at 100°C for 10 hou...

Embodiment 2

[0046] A photonic crystal thin film is prepared according to the following method:

[0047] (1) Preparation of hydrogel photonic crystal precursor: Fe 3 o 4 Nanoparticles, acrylamide, methylene acrylamide and photoinitiator are uniformly dispersed in ethylene glycol by ultrasonic dispersion method to obtain a suspension of hydrogel photonic crystal precursor, so that each milliliter of photonic crystal hydrogel precursor Contains Fe 3 o 4 Nanoparticles 2mg, acrylamide 300mg, methylene acrylamide 4.5mg, photoinitiator 0.22mg; ethylene glycol as an organic solvent can prevent Fe 3 o 4 The nanoparticles are separated under a magnetic field.

[0048] The Fe 3 o 4 Nanoparticles are prepared as follows: dissolve ferrocene and hydrogen peroxide in 75ml of acetone, and add the solution to a 100mL stainless steel reaction kettle, so that the concentration of ferrocene in the solution is 0.0023mg / ml, and the concentration of hydrogen peroxide is 0.025mg / ml; react at 200°C for 2...

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