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Photonic crystal humidity sensor and preparation method thereof

A humidity sensor and photonic crystal technology, applied in the field of materials, can solve the problems of application limitations, poor biocompatibility, etc., and achieve the effects of enhanced fluorescence intensity changes, rapid absorption and release, and obvious volume changes

Active Publication Date: 2017-07-28
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials of these artificially prepared photonic crystals have poor biocompatibility, and will produce a large rejection reaction in the environment of the human body or other animals, and their application in the field of biological science is limited to a certain extent.

Method used

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  • Photonic crystal humidity sensor and preparation method thereof
  • Photonic crystal humidity sensor and preparation method thereof
  • Photonic crystal humidity sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] S1. Preparation of polystyrene opal-type photonic crystal structure templates with different lattice constants:

[0039] S11, by the method of soap-free emulsion polymerization (the particle size range is 100nm-1000nm), prepare the monodisperse polystyrene microsphere emulsion of particle diameter 295nm, 310nm, 350nm, 353nm, 365nm, 385nm, solid content is about 10% ( w / v), as a basic structure, diluted with water to 2wt.% when used:

[0040] S111. Weigh 0.175g of ammonium persulfate into a beaker, add 20mL of deionized water to dissolve;

[0041] S112. Measure 2.08mL, 1.83mL, 1.15mL, 1.10mL, 0.90mL, 0.57mL of acrylic acid and 38.5mL of styrene respectively, dissolve in 300mL of deionized water, stir in a 500mL four-necked flask at 250r / min, turn on the cooling water , bubbling with nitrogen gas for 20 minutes;

[0042] After the S113 oil bath was heated to 70°C and stabilized, ammonium persulfate aqueous solution was added, and the reaction was carried out for 7 hours u...

Embodiment 2

[0054] Photonic crystal humidity sensors with the same dimension and the same lattice constant have the same photonic bandgap structure, but photonic crystal humidity sensors with different layers have different fluorescence emission enhancement behaviors with different magnifications. In this embodiment, the fluorescence intensity of the photonic crystal humidity sensor is adjusted by adjusting the number of photonic crystal structure layers of the opal-type photonic crystal template.

[0055] S11. A monodisperse polystyrene microsphere emulsion with a particle size of 500 nm was prepared by the soap-free emulsion polymerization method described in Example 1, wherein the amount of added acrylic acid was 0.33 mL, and the amount of styrene was 38.5 mL.

[0056] S12. Take different volumes of polystyrene microsphere emulsion (2wt.%) with a particle size of 500nm (2wt.%) 0ul, 25ul, 75ul, 100ul, spread it on a flat glass sheet with a volume of 1cm*1cm, put it into a 40°C oven for d...

Embodiment 3

[0064] Photonic crystal humidity sensors with the same lattice constant, the same substance, the same dimension and the same number of layers have the same photonic bandgap structure, but different ratios of dyes and silk proteins will produce different fluorescence emission behaviors. In this embodiment, the fluorescence intensity of the photonic crystal humidity sensor is adjusted by adjusting the ratio of the dye to the silk protein.

[0065] S11. A monodisperse polystyrene microsphere emulsion with a particle size of 385 nm was prepared by the soap-free emulsion polymerization method described in Example 1, wherein the amount of acrylic acid added was 0.57 mL, and the amount of styrene was 38.5 mL.

[0066] S12. Take 100ul of polystyrene microsphere emulsion (2wt.%) with a particle size of 385nm in the same volume, spread it on a flat glass sheet with a volume of 1cm*1cm, put it in a 40°C oven to dry, and obtain polystyrene with the same number of layers Opal-type photonic...

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Abstract

The invention relates to a photonic crystal humidity sensor and a preparation method thereof. According to the invention, a fluorescent dye is blended with a fibroin solution to prepare a photonic crystal humidity sensor with an inverse opal structure by template method, by means of the sensitivity of silk itself to humidity and the amplification effect of a photonic crystal structure on fluorescence, the photonic crystal humidity sensor has the obvious humidity responsive fluorescence alternation characteristic. Because of easily available raw materials, simple implementation method and strong functional pertinence, the photonic crystal humidity sensor provided by the invention has wide application and very strong actual popularization value in biology, chemical sensing fields and other aspects.

Description

technical field [0001] The invention relates to the field of materials, in particular to a photonic crystal humidity sensor and a preparation method thereof. Background technique [0002] Photonic crystal refers to a material structure formed by periodic arrangement of two or more materials with different dielectric constants. Because of its unique optical characteristics, it can amplify the luminous intensity of many luminescent substances, and then realize the output of amplified optical signals. Photonic crystal materials with amplified response characteristics can be obtained by preparing materials with response characteristics into photonic crystal materials. The stimulus signal applied by the outside world will change the physical and chemical properties of the response materials, thereby affecting the periodic structure and refractive index of the photonic crystal itself. , so that the light control of the responsive material changes, and the amplified conversion of t...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 刘向阳胡帆
Owner XIAMEN UNIV
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