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Photonic crystal composite pressure sensor and preparation method thereof, and optical detecting method

A pressure sensor and photonic crystal technology, applied in the field of sensing materials, can solve the problems of glass slides and other materials such as fragility, strong substrate attachment, and non-flexibility, achieving high sensitivity and flexibility, strong practical promotion value, and strong The effect of product suitability

Active Publication Date: 2019-08-30
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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  • Photonic crystal composite pressure sensor and preparation method thereof, and optical detecting method
  • Photonic crystal composite pressure sensor and preparation method thereof, and optical detecting method
  • Photonic crystal composite pressure sensor and preparation method thereof, and optical detecting 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

The invention relates to a photonic crystal composite pressure sensor, which comprises a flexible substrate and a photonic crystal distributed on the surface of or inside the flexible substrate, wherein the photonic crystal can response the deformation of the flexible substrate to generate optical signal change. The invention further relates to a method of the photonic crystal composite pressure sensor, wherein the method comprises: preparing a photonic crystal precursor liquid; preparing a substrate precursor liquid; and compounding the photonic crystal precursor liquid and the substrate precursor liquid to obtain the photonic crystal composite pressure sensor. The invention further relates to an optical detecting method, which comprises: placing a hollow cylinder above the photonic crystal composite pressure sensor; and applying dynamic pressure to the hollow cylinder, and carrying out dynamic detection on the optical signal of the photonic crystal composite pressure sensor through the hollow portion of the hollow cylinder by an optical probe. According to the present invention, the photonic crystal composite pressure sensor has sensitive linear pressure response characteristic in a low pressure region of 0-10 KPa, and has characteristics of easily available raw materials, simple preparation method and wide application range.

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 Applications(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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