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A photonic crystal composite pressure sensor and its preparation method and optical detection method

A pressure sensor and photonic crystal technology, applied in the field of sensing materials, can solve the problems of fragile materials such as glass slides, strong substrate attachment, and inflexibility, and achieve high sensitivity and flexibility, strong practical promotion value, strong The effect of product adaptation

Active Publication Date: 2020-11-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape-memory photonic crystal material reported by CN106751604A requires a large force to complete the shape change process, and it takes a long time to return to the original shape after the external force is removed, and the color change has not been quantitatively analyzed, that is, it cannot be changed by external force. The function cannot respond in time and measure quantitatively, so it is not suitable as a pressure sensor
[0004] However, other reported photonic crystal pressure-responsive materials have complicated process, long preparation cycle, poor flexibility, strong attachment to the substrate, and restrictions on the application environment.
CN103411671B uses the mold method to pour the suspension containing the initiator, photonic crystal particles, and hydrogel prepolymer into it, and uses ultraviolet light irradiation or thermosetting to polymerize the suspension to obtain a colloidal hydrogel film. The pressure-responsive hydrogel grating obtained by encapsulating the colloidal hydrogel film with glass slides, gaskets, fixtures, etc. has poor flexibility
However, these pressure-responsive materials that have undergone multi-step post-encapsulation are fixed in shape, inflexible, poor in adaptability to sensing environments, and materials such as glass slides are fragile, so their practical applications are limited, especially in the environment of humans or other animals. very restrictive

Method used

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  • A photonic crystal composite pressure sensor and its preparation method and optical detection method
  • A photonic crystal composite pressure sensor and its preparation method and optical detection method
  • A photonic crystal composite pressure sensor and its preparation method and optical detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0084] This embodiment provides a method for preparing an opal-type photonic crystal composite pressure sensor with a limited pitch arrangement, including the following steps:

[0085] S1. Preparation of photonic crystal precursor liquid:

[0086] Monodisperse polystyrene microspheres with particle sizes of 160nm, 205nm, 235nm, 240nm, 275nm, 300nm, and 335nm were prepared by soap-free emulsion polymerization (with a particle size range of 100nm-1000nm). The solid content of the emulsion was about 10% (w / v), the steps are as follows:

[0087] Weigh 0.175g of ammonium persulfate into a beaker, add 20mL of deionized water to dissolve it. Measure 4.33mL, 3.58mL, 3.08mL, 3.00mL, 2.42mL, 2.00mL, 1.42mL of acrylic acid and 38.5mL of styrene, dissolve in 300mL of deionized water, stir in a 500mL four-neck flask at 250r / min, open Cooling water, nitrogen gas bubbling for 20min, and then heating in an oil bath to 70°C to stabilize, adding ammonium persulfate aqueous solution, turning o...

Embodiment 2

[0094] This embodiment provides a method for preparing an inverse opal-type photonic crystal composite pressure sensor with a defined porous spacing, including the following steps:

[0095] S1. Preparation of photonic crystal precursor liquid:

[0096] A monodisperse polystyrene microsphere emulsion with a particle size of 300 nm was prepared according to the method of Example 1, wherein the amount of acrylic acid added was 2.00 mL.

[0097] S2. Preparation of matrix precursor solution:

[0098] Preparation of silk protein solution: Wash the broken cocoons with 0.05% (w / v) sodium bicarbonate to remove sericin, then wash with deionized water, and dry naturally to obtain dry silk fibers. Dissolve the dried silk fibers in 9.2mol / L lithium bromide solution at 60°C, and precipitate lithium bromide in distilled water by dialysis to obtain a silk protein solution with a concentration of about 7% (w / v).

[0099] Preparation of keratin gel precursor: obtained according to the method ...

Embodiment 3

[0104] This embodiment provides a method for preparing a periodically arranged array photonic crystal composite pressure sensor, including the following steps:

[0105] S1. Preparation of matrix precursor solution:

[0106] According to Example 2, a matrix precursor solution with a concentration of 7% (w / v) was prepared.

[0107] S2. Preparation of photonic crystal composite pressure sensor:

[0108] Add 2wt% photosensitive small molecule o-nitrobenzaldehyde (2-NBA) to the matrix precursor solution, mix it evenly, and apply it on the substrate sheet, use the photolithography template of the matrix pattern as a mask, and irradiate it with ultraviolet light , causing rapid gelation, and then peeling off from the substrate, that is, a periodically arranged array photonic crystal composite pressure sensor is obtained.

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Abstract

A photonic crystal composite pressure sensor includes a flexible substrate and a photonic crystal, the photonic crystal is distributed on the surface or inside of the flexible substrate, and the photonic crystal can generate optical signal changes in response to the deformation of the flexible substrate. The invention also relates to a method for a photonic crystal compound pressure sensor, comprising: preparing a photonic crystal precursor liquid; preparing a matrix precursor liquid; compounding the photonic crystal precursor liquid and the matrix precursor liquid to obtain a photonic crystal compound pressure sensor. The present invention also relates to an optical detection method, comprising: placing the hollow cylinder above the photonic crystal composite pressure sensor; applying dynamic pressure to the hollow cylinder, and the optical probe applies the photonic crystal composite pressure through the hollow part of the hollow cylinder The optical signal of the sensor is dynamically detected. The invention has sensitive linear pressure response characteristics in the low-pressure area of ​​0-10KPa, the raw materials are easy to obtain, the preparation method is simple, and the application range is wide.

Description

technical field [0001] The invention relates to the field of sensing materials, and in particular to a photonic crystal composite pressure sensor, a preparation method and an optical detection method thereof. Background technique [0002] The preparation of pressure-responsive photonic crystal materials is a composite of flexible materials with excellent mechanical properties and nano / micro-scale photonic crystal materials. By stretching or compressing it mechanically, the flexible material will change the optical structure of the photonic crystal, resulting in a change in the optical properties (wavelength or intensity) emitted by the photonic crystal, realizing the transmission of physical deformation into optical property changes. sense function. [0003] Most of the current reports are shape memory photonic crystal materials, which are not suitable for pressure sensors, especially for the detection of low pressure regions. Shape memory photonic crystals mean that under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08L89/00C08L25/08C08L83/04C08K5/32C08K3/16C08F212/08C08F220/06G01L1/24
CPCG01L1/24C08F212/08C08L89/00C08J2389/00C08J2425/08C08J2489/00C08J2383/04C08J7/0427C08F220/06C08K5/32C08L25/08C08K3/16
Inventor 刘向阳胡帆
Owner XIAMEN UNIV
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