CN103868890A - Photonic crystal thin film-based gas sensor and application thereof - Google Patents
Photonic crystal thin film-based gas sensor and application thereof Download PDFInfo
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Abstract
The invention relates to a photonic crystal thin film-based gas sensor and application thereof. The photonic crystal thin film-based gas sensor comprises a sealed container and a gas injector connected with the sealed container, wherein gas is injected into the sealed container; a photonic crystal thin film is arranged in the sealed container for detecting the concentration of gas; target gases of different concentrations are injected into the sealed container by using the gas injector; the reflection spectrum curve of the photonic crystal thin film in the gas mixture is measured in sequence by using a spectrometer, and then the relation curve of the gas concentration and the reflection peak wavelength of the photonic crystal thin film is fitted; a target gas-containing gas sample to be detected is injected into the sealed container by using the gas injector, the color change is observed, the reflection peak wavelength of the photonic crystal thin film is detected by using the spectrometer, and the concentration of the target gas in the gas sample to be detected is obtained by using the fitted curve. The gas sensor has the advantages of small size, stable structure, easiness in operation, repeatable use and the like, and has high sensitivity and adjustable detection range and accuracy.
Description
Technical field
The invention belongs to material preparation and determination methods analysis technical field, relate to preparation and the application of gas sensing, photonic crystal, especially relate to a kind of gas sensor and application thereof based on photon crystal film.
Background technology
In the industries such as environmental protection, petrochemical complex, metallurgy, medicines and health protection, all require various gas mediums to measure and control, this has great importance to fields such as air treating, quality supervision, the saving energy, reinforcement business accounting.Traditional gas detection technology normally adopts the means such as the point sensor, gas chromatography, infrared spectrum of galvanochemistry, semiconductor technology, detect the object of gas although these sensors can reach, it is expensive, need specific apparatus, easily polluted etc. that shortcoming is difficult to realize in real time, continuous detecting efficiently.In view of the each side defect that above various comparatively ripe gas detection technologies exist, design a kind of function admirable, low cost, gas-detecting device seems extremely urgent fast.
Photonic crystal refers to that folding has material periodically material of alternately formation one on submicron-scale of different refractivity.In crystal, to produce diffraction similar with X ray, and visible ray produces diffraction in photonic crystal, thereby demonstrates specific color.Photon lixiviate has obtained huge development till now from 1998, and 1999, U.S. authority " science " magazine was chosen as photonic crystal in one of ten big hot topic fields of 21 century.
Photon band gap is the most fundamental characteristic of photonic crystal, and the visible ray of wavelength in photon band gap forbidden propagating.Due to the existence of photon band gap, people can, by design photonic crystal micromechanism, realize the regulation and control to various wavelength light.The principal element that affects photon band gap has two, one is the micromechanism of photonic crystal, and another is the refractive index ratio of two media, therefore, changing photon band gap can consider from this two aspect: the one, and the refractive index change system, the 2nd, the periodicity of change photonic crystal.Under the stimulation of external environment condition, change one of them parameter and can play the object that regulates forbidden photon band.For example, utilize the chemical stimulation in illumination, temperature, pressure, electric field, magnetic field and solution to change the parameters such as refractive index, crystalline network, thereby realize the regulation and control to photon band gap, thereby realize colorimetric detection.At present, the eventful detection to fluid sample, physical parameter of photonic crystal sensors, as Review literature: Yuanjin Zhao, Xiangwei Zhao, and Zhongze Gu.Photonic Crystals in Bioassays.Adv.Funct.Mater.2010, a series of chemical sensors described in 20,2970-2988..In gas context of detection, the application of photonic crystal is still less, and the present invention is the gas sensor based on photonic crystal, is easy to integratedly based on photon crystal device, and Stability Analysis of Structures, the feature such as can reuse, and makes it have in actual applications good prospect.
Summary of the invention
Object of the present invention be exactly provide in order to overcome the defect that above-mentioned prior art exists that a kind of volume is little, Stability Analysis of Structures, easy operating and the reusable gas sensor based on photonic crystal.This sensor enters gas injection to be measured after closed container, and gas is absorbed by photon crystal film, causes expansion or the contraction of film, and the periodicity of photonic crystal is changed, and finally realizes the colorimetric detection of gas.
Object of the present invention can be achieved through the following technical solutions:
Based on a gas sensor for photon crystal film, the gas syringe that comprises an airtight container, is connected with airtight container, to injected gas in airtight container, is placed with photon crystal film in described airtight container.
Photon crystal film adopts following methods to prepare:
(1) synthesize monodisperse silica microspheres by sol-gal process: control bath temperature is 10-35 DEG C, successively esters of silicon acis, water, ammoniacal liquor are added in ethanol, stir, reaction 10-20h, prepares stability, the good silicon dioxide microsphere emulsion of homogeneity;
(2) microballoon emulsion step (1) being made is purified with centrifugal-ultrasonic method, in constant temperature oven, in 10-40 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited on and in substrate, forms regular silicon dioxide opal photonic crystal film;
(3) get the silicon dioxide opal photonic crystal film that step (2) makes, splash into polybenzazole precursor liquid solution, illumination polymerization, and remove silicon dioxide photon crystal film with hydrofluorite, obtain the counter opal structure polymer photon crystal film to gas sensitization.
The weight ratio of step (1) mesosilicic acid ester, water, ammoniacal liquor is (0.5～2): (0～2): (0.5～2).
Described esters of silicon acis molecular formula is Si (OR)
4, wherein R is C
nh
2n+1, n=1-6, esters of silicon acis is selected from one or more in methyl silicate, ethyl orthosilicate or positive silicic acid propyl ester.
The described self-assembling method of step (2) comprises the following steps:
1. monodisperse silica microspheres is disperseed with absolute ethyl alcohol, form the dispersion liquid of 0.1-2% massfraction;
2. dispersion liquid is joined in clean glass solution, in glass container, the smooth glass sheet of vertical placement, is positioned in constant temperature oven, dry 2-8 days at 10-40 DEG C.
Polybenzazole precursor liquid solution described in step (3) is made up of for 1-50: 0-50: 1-10: 30-70: 0.05-0.2 by weight monomer, comonomer, crosslinking chemical, solvent, the initiating agent with gas recognition function,
The described monomer with gas recognition function is styrene, methacryl or the Diacryloyl derivative that contains carboxyl, amido, pyridine functional groups,
Described comonomer is free yl polymerizating monomer, comprises styrene, methyl methacrylate or acrylamide,
Described crosslinking chemical is the crosslinking chemical for free radical polymerization, comprises ethylene glycol, dimethylacrylate or divinylbenzene,
Described initiating agent is photoinitiator or temperature-sensitive initiating agent, comprises azo-bis-isobutyl cyanide or benzoyl peroxide,
Described solvent is alcohols solvent, aromatic hydrocarbon solvent, chloroform or dimethyl sulfoxide.
Step (3) adopts ultraviolet irradiation to promote polymerization, then utilizes the hydrofluoric acid treatment 10-60min of concentration 1-2wt%.
Gas sensor based on photon crystal film can, for detection of gas concentration, adopt following steps:
(1) utilize gas syringe to the object gas of injecting variable concentrations in airtight container;
(2) utilize the spectrometer reflectance spectrum curve of measurement of photon crystal film in gaseous mixture successively, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength;
(3) utilize gas syringe to inject the gaseous sample to be detected that contains object gas in airtight container, observe change color, use spectrometer to detect photon crystal film reflection peak wavelength, utilize the curve of matching to obtain the concentration of object gas in gaseous sample to be detected.
Described gas syringe is provided with scale, controls the gas volume being expelled in airtight container.
Can also splendid attire water in described airtight container.
Common gas detection method comprises infrared spectrum, gas sensory element, and electrochemical method etc., generally speaking the needed equipment of these methods is all very expensive.Compared with prior art, the present invention, by preparing counter opal structure polymer photon crystal film, has very low cost, high sensitivity, adjustable sensing range and precision for the detection of gas.For example, it is infrared spectrums that traditional carbon dioxide detects conventional means, but infrared spectrum checkout equipment is comparatively expensive, and gas demand is larger, and testing result is subject to the impact of humidity and carbon monoxide larger, and use the photon crystal film of dimethylamino-propyl modification (by hydroxyethyl methylacrylate, dimethylamino-propyl Methacrylamide, ethylene glycol (dimethylacrylate, 2-hydroxyl-4 '-(2-hydroxy ethoxy)-2-methyl phenyl ketone, methyl alcohol is 35: 15: 3.8 according to weight ratio: illumination in 0.2: 46 is polymerized) carry out carbon dioxide detection, in the time that gaseous sample amount is 0.15mL, can detect the concentration of the carbon dioxide sample of 0-100%, in the time that gaseous sample amount is 1mL, can detect the concentration of the carbon dioxide sample of 0-5vo1%, and be subject to humidity, carbon monoxide affects all close to zero.In testing process, the amido in carbon dioxide and photon crystal film in gaseous sample neutralizes quantitatively, and forms salt, produces quantitatively osmotic pressure, and photon crystal film is expanded, thus photonic crystal diffraction peak red shift of wavelength.As can be seen here, use the gas sensor based on photon crystal film involved in the present invention, can realize more more reliable than prior art and detect cheaply, and can regulate sensitivity and sensing range.
Brief description of the drawings
Fig. 1 is the structural representation of the gas sensor based on photon crystal film;
Fig. 2 is the scanning electron microscope picture of silicon dioxide opal photonic crystal film in embodiment 1;
Fig. 3 is counter opal structure polymer photon crystal film scanning Electronic Speculum picture in embodiment 1;
The reflection peak of the photosynthesis-carbon dioxide response counter opal structure polymer photon crystal film that Fig. 4 obtains for embodiment 1 in the 0.15mL of variable concentrations carbon dioxide/nitrogen mixture; The illustration in the upper right corner is the changing value of film diffraction peak with gas concentration lwevel;
The response condition of the photosynthesis-carbon dioxide response counter opal structure polymer photon crystal film that Fig. 5 obtains for embodiment 1 in the 1.5mL of variable concentrations carbon dioxide/nitrogen mixture is the changing value of film diffraction peak with gas concentration lwevel in figure;
The reflection peak of the ammonia response counter opal structure polymer photon crystal film that Fig. 6 obtains for embodiment 2 in the 25L of variable concentrations ammonia/nitrogen combination gas;
The response condition of the ammonia response counter opal structure polymer photon crystal film that Fig. 7 obtains for embodiment 2 in the 25L of variable concentrations ammonia/nitrogen combination gas is the changing value of film diffraction peak with ammonia concentration in figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Based on the carbon dioxide sensor of photon crystal film
1) synthesize monodisperse silica microspheres by sol-gal process: get 40mL absolute ethyl alcohol, constant temperature, after 25 DEG C, adds 1.8g ethyl orthosilicate, 1.8g water, 1.8g ammoniacal liquor successively, stirs, at 25 DEG C, react more than 10 hours, obtain the alcohol dispersion liquid of microballoon;
2) by step 1) emulsion that makes, after centrifugal-ultrasonic purifying, be diluted to the ethanol emulsion of 0.8% massfraction, in constant temperature oven in 25 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited on and in substrate of glass, forms silicon dioxide opal photonic crystal film, scanning electron microscope (SEM) photograph as shown in Figure 1, taking this film as template:
3) toward step 2) the photonic crystal book film obtaining splashes into the polybenzazole precursor liquid solution (massfraction) of following formula, by ultraviolet lighting polymerization at normal temperatures:
4) use 1% hydrofluoric acid aqueous solution to remove silicon dioxide microsphere, clean after washing with ammoniacal liquor, obtain counter opal structure polymer photon crystal film, stereoscan photograph as shown in Figure 2.
5) by step 4) made counter opal structure polymer photon crystal film is placed among the container with gas syringe of sealing, use carbon dioxide/nitrogen mixture body of injector to inject variable concentrations, use spectrometer to survey successively the reflectance spectrum curve of photon crystal film in the combination gas of different gas concentration lwevels, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength
6) to step 5) container in inject gaseous sample to be measured, directly observe change color, and use spectrometer measurement reflectance spectrum curve, and then push away to obtain the gas concentration lwevel in gaseous sample.
Present embodiment step 5) in matching solution the method for the relation of gas concentration lwevel and photon crystal film reflection peak wavelength can be taking photon crystal film reflection peak wavelength as ordinate, in combination gas, gas concentration lwevel is horizontal ordinate described point, uses sweep matching in coordinate diagram.Fig. 4 is the reflection peak of photosynthesis-carbon dioxide response counter opal structure polymer photon crystal film in the 0.15mL of variable concentrations carbon dioxide/nitrogen mixture; The illustration in the upper right corner is the changing value of film diffraction peak with gas concentration lwevel.
Present embodiment, as a kind of method of measurement gas carbon dioxide, is to utilize after counter opal structure polymer photon crystal film identification carbon dioxide, and significant bulking effect can occur, and causes the cycle of photonic crystal to become large, thereby makes reflected light red shift.Can sum up the reflectance spectrum change curve of the photon crystal film of the carbon dioxide mix gas of variable concentrations by lots of comparing experiments, on this basis, know the gas concentration lwevel of gaseous sample to be measured by inference.Fig. 5 is the response condition of photosynthesis-carbon dioxide response counter opal structure polymer photon crystal film in the 1.5mL of variable concentrations carbon dioxide/nitrogen mixture, is the changing value of film diffraction peak with gas concentration lwevel in figure.
Based on the ammonia gas sensor of photon crystal film
1) synthesize monodisperse silica microspheres by sol-gal process: get 100mL absolute ethyl alcohol, constant temperature, after 22 DEG C, adds 4g ethyl orthosilicate, 4.2g water, 3.4g ammoniacal liquor successively, stirs, at 22 DEG C, react more than 10 hours, obtain the alcohol dispersion liquid of microballoon;
2) by step 1) emulsion that makes, after centrifugal-ultrasonic purifying, be diluted to the ethanol emulsion of 0.9% massfraction, in constant temperature oven in 25 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited in substrate of glass and forms silicon dioxide opal photonic crystal film, taking this film as template:
3) toward step 2) photon crystal film obtaining splashes into the polybenzazole precursor liquid solution (massfraction) of following formula, by ultraviolet lighting polymerization at normal temperatures:
4) use 1.5% hydrofluoric acid aqueous solution to remove silicon dioxide microsphere, and with salt acid treatment after washing, obtain counter opal structure polymer photon crystal film.
5) by step 4) made counter opal structure polymer photon crystal film is placed among the container with gas syringe of sealing, use the ammonia/nitrogen mixed gas of injector to inject variable concentrations, use spectrometer to survey successively the reflectance spectrum curve of photon crystal film in the combination gas of different ammonia concentrations, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength, Fig. 6 is the reflection peak of ammonia response counter opal structure polymer photon crystal film in the 25L of variable concentrations ammonia/nitrogen combination gas.
6) to step 5) container in inject gaseous sample to be measured, directly observe change color, and use spectrometer measurement reflectance spectrum curve, and then push away to obtain the ammonia concentration in gaseous sample.Fig. 7 is the response condition of ammonia response counter opal structure polymer photon crystal film in the 25L of variable concentrations ammonia/nitrogen combination gas, is the changing value of film diffraction peak with ammonia concentration in figure.
Based on the formaldehyde sensor of photon crystal film
1) synthesize monodisperse silica microspheres by sol-gal process: get 40mL absolute ethyl alcohol, constant temperature, after 26 DEG C, adds 1.6g ethyl orthosilicate, 2.3g water, 1.8g ammoniacal liquor successively, stirs, at 26 DEG C, react more than 10 hours, obtain the alcohol dispersion liquid of microballoon;
2) by step 1) emulsion that makes, after centrifugal-ultrasonic purifying, be diluted to the ethanol emulsion of 1% massfraction, in constant temperature oven in 30 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited in substrate of glass and forms silicon dioxide opal photonic crystal film, taking this film as template:
3) toward step 2) photon crystal film obtaining splashes into the polybenzazole precursor liquid solution (massfraction) of following formula, by ultraviolet lighting polymerization at normal temperatures:
4) use 1% hydrofluoric acid aqueous solution to remove silicon dioxide microsphere, and clean with pure water, obtain counter opal structure polymer photon crystal film.
5) by step 4) made counter opal structure polymer photon crystal film is placed among the container with gas syringe of sealing, use formaldehyde/nitrogen mixture body of injector to inject variable concentrations, use spectrometer to survey successively the reflectance spectrum curve of photon crystal film in the combination gas of different concentration of formaldehyde, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength.
6) to step 5) container in inject gaseous sample to be measured, directly observe change color, and use spectrometer measurement reflectance spectrum curve, and then push away to obtain the concentration of formaldehyde in gaseous sample.
A kind of gas sensor based on photon crystal film, its structure as shown in Figure 1, the gas syringe 2 that comprises an airtight container 1, is connected with airtight container 1, can be to the interior injected gas of airtight container 1, thereby scale can be set on gas syringe 2 and control the volume of air of injecting, airtight container 1 seals through gland bonnet 4, is placed with photon crystal film 3 in airtight container 1, and airtight container 1 is interior can also exist appropriate water.
(1) synthesize monodisperse silica microspheres by sol-gal process: controlling bath temperature is 10 DEG C, be to add at 0.5: 0.5 in ethanol by weight by esters of silicon acis, ammoniacal liquor successively, stir, reaction 10h, prepare stability, the good silicon dioxide microsphere emulsion of homogeneity, the esters of silicon acis wherein using is methyl silicate;
(2) microballoon emulsion step (1) being made is purified with centrifugal-ultrasonic method, in constant temperature oven, in 10 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited on and in substrate of glass, forms regular silicon dioxide opal photonic crystal film;
(3) get the silicon dioxide opal photonic crystal film that step (2) makes, splash into polybenzazole precursor liquid solution, ultraviolet lighting promotes polymerization, and with the hydrofluoric acid treatment 60min of concentration 1wt%, remove silicon dioxide photon crystal film, obtain the counter opal structure polymer photon crystal film to gas sensitization, the polybenzazole precursor liquid solution using is by the monomer with gas recognition function, comonomer, solvent, initiating agent is 1: 1: 30 by weight: 0.05 composition, the monomer with gas recognition function is the styrene that contains carboxyl, comonomer is methylacrylic acid methyl esters, crosslinking chemical is ethylene glycol, initiating agent is azo-bis-isobutyl cyanide, solvent is chloroform.
The gas sensor of this kind based on photon crystal film can, for detection of gas concentration, adopt following steps:
(1) utilize gas syringe to the object gas of injecting variable concentrations in airtight container;
(2) utilize the spectrometer reflectance spectrum curve of measurement of photon crystal film in gaseous mixture successively, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength;
(3) utilize gas syringe to inject the gaseous sample to be detected that contains object gas in airtight container, observe change color, use spectrometer to detect photon crystal film reflection peak wavelength, utilize the curve of matching to obtain the concentration of object gas in gaseous sample to be detected.
Embodiment 5
A kind of gas sensor based on photon crystal film, its structure as shown in Figure 1, the gas syringe 2 that comprises an airtight container 1, is connected with airtight container 1, can be to the interior injected gas of airtight container 1, thereby scale can be set on gas syringe 2 and control the volume of air of injecting, airtight container 1 seals through gland bonnet 4, is placed with photon crystal film 3 in airtight container 1, and airtight container 1 is interior can also exist appropriate water.
Photon crystal film adopts following methods to prepare:
(1) synthesize monodisperse silica microspheres by sol-gal process: controlling bath temperature is 35 DEG C, be to add at 2: 2: 2 in ethanol by weight by esters of silicon acis, water, ammoniacal liquor successively, stir, reaction 20h, prepare stability, the good silicon dioxide microsphere emulsion of homogeneity, the esters of silicon acis wherein adopting is the potpourri of ethyl orthosilicate and positive silicic acid propyl ester;
(2) microballoon emulsion step (1) being made is purified with centrifugal-ultrasonic method, in constant temperature oven, in 40 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited on and in substrate, forms regular silicon dioxide opal photonic crystal film;
(3) get the silicon dioxide opal photonic crystal film that step (2) makes, splash into polybenzazole precursor liquid solution, ultraviolet lighting polymerization, and with the hydrofluoric acid treatment 10min of concentration 2wt%, remove silicon dioxide photon crystal film, obtain the counter opal structure polymer photon crystal film to gas sensitization, the polybenzazole precursor liquid solution using is by the monomer with gas recognition function, comonomer, crosslinking chemical, solvent, initiating agent is 50: 50: 10 by weight: 70: 0.2 compositions, the monomer with gas recognition function is the Diacryloyl derivative that contains pyridine functional groups, comonomer is acrylamide, crosslinking chemical is dimethylacrylate, initiating agent is benzoyl peroxide, solvent is dimethyl sulfoxide.
The gas sensor of this kind based on photon crystal film can, for detection of gas concentration, adopt following steps:
(1) utilize gas syringe to the object gas of injecting variable concentrations in airtight container;
(2) utilize the spectrometer reflectance spectrum curve of measurement of photon crystal film in gaseous mixture successively, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength;
(3) utilize gas syringe to inject the gaseous sample to be detected that contains object gas in airtight container, observe change color, use spectrometer to detect photon crystal film reflection peak wavelength, utilize the curve of matching to obtain the concentration of object gas in gaseous sample to be detected.
Claims (10)
1. the gas sensor based on photon crystal film, the gas syringe that comprises an airtight container, is connected with airtight container, to injected gas in airtight container, is characterized in that, in described airtight container, is placed with photon crystal film.
2. a kind of gas sensor based on photon crystal film according to claim 1, is characterized in that, described photon crystal film adopts following methods to prepare:
(1) synthesize monodisperse silica microspheres by sol-gal process: control bath temperature is 10-35 DEG C, successively esters of silicon acis, water, ammoniacal liquor are added in ethanol, stir, reaction 10-20h, prepares stability, the good silicon dioxide microsphere emulsion of homogeneity;
(2) microballoon emulsion step (1) being made is purified with centrifugal-ultrasonic method, in constant temperature oven, in 10-40 DEG C of temperature, adopt self-assembling method, silicon dioxide microsphere is deposited on and in substrate, forms regular silicon dioxide opal photonic crystal film;
(3) get the silicon dioxide opal photonic crystal film that step (2) makes, splash into polybenzazole precursor liquid solution, illumination polymerization, and remove silicon dioxide photon crystal film with hydrofluorite, obtain the counter opal structure polymer photon crystal film to gas sensitization.
3. a kind of gas sensor based on photon crystal film according to claim 2, it is characterized in that, the weight ratio of step (1) mesosilicic acid ester, water, ammoniacal liquor is (0.5～2): (0～2): (0.5～2).
4. according to a kind of gas sensor based on photon crystal film described in claim 2 or 3, it is characterized in that, described esters of silicon acis molecular formula is Si (OR)
4, wherein R is C
nh
2n+1, n=1-6, esters of silicon acis is selected from one or more in methyl silicate, ethyl orthosilicate or positive silicic acid propyl ester.
5. a kind of gas sensor based on photon crystal film according to claim 2, is characterized in that, the described self-assembling method of step (2) comprises the following steps:
1) monodisperse silica microspheres is disperseed with absolute ethyl alcohol, form the dispersion liquid of 0.1-2% massfraction;
2) dispersion liquid is joined in clean glass solution, in glass container, the smooth glass sheet of vertical placement, is positioned in constant temperature oven, dry 2-8 days at 10-40 DEG C.
6. a kind of gas sensor based on photon crystal film according to claim 2, it is characterized in that, polybenzazole precursor liquid solution described in step (3) is 1-50: 0-50: 1-10: 30-70 by monomer, comonomer, crosslinking chemical, solvent, the initiating agent with gas recognition function by weight: 0.05-0.2 forms
The described monomer with gas recognition function is styrene, methacryl or the Diacryloyl derivative that contains carboxyl, amido, pyridine functional groups,
Described comonomer is free yl polymerizating monomer, comprises styrene, methyl methacrylate or acrylamide,
Described crosslinking chemical is the crosslinking chemical for free radical polymerization, comprises ethylene glycol, dimethylacrylate or divinylbenzene,
Described initiating agent is photoinitiator or temperature-sensitive initiating agent, comprises azo-bis-isobutyl cyanide or benzoyl peroxide,
Described solvent is alcohols solvent, aromatic hydrocarbon solvent, chloroform or dimethyl sulfoxide.
7. a kind of gas sensor based on photon crystal film according to claim 2, is characterized in that, step (3) adopts ultraviolet irradiation to promote polymerization, then utilizes the hydrofluoric acid treatment 10-60min of concentration 1-2wt%.
8. the application of the gas sensor based on photon crystal film as described in any one in claim 1-7, is characterized in that, this gas sensor, for detection of gas concentration, adopts following steps:
(1) utilize gas syringe to the object gas of injecting variable concentrations in airtight container;
(2) utilize the spectrometer reflectance spectrum curve of measurement of photon crystal film in gaseous mixture successively, the relation curve of then matching gas concentration and photon crystal film reflection peak wavelength;
(3) utilize gas syringe to inject the gaseous sample to be detected that contains object gas in airtight container, observe change color, use spectrometer to detect photon crystal film reflection peak wavelength, utilize the curve of matching to obtain the concentration of object gas in gaseous sample to be detected.
9. the application of a kind of gas sensor based on photon crystal film according to claim 8, is characterized in that, described gas syringe is provided with scale, controls the gas volume being expelled in airtight container.
10. the application of a kind of gas sensor based on photon crystal film according to claim 8, is characterized in that, can also splendid attire water in described airtight container.
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| CN106947485A (en) * | 2017-03-16 | 2017-07-14 | 电子科技大学 | A kind of synthetic method of quantum dot photonic crystal laminated film |
| CN107934971A (en) * | 2017-12-14 | 2018-04-20 | 苏州中科纳福材料科技有限公司 | The preparation method of photon crystal film |
| CN108465465A (en) * | 2018-04-04 | 2018-08-31 | 广东工业大学 | A kind of semiconductive thin film and preparation method thereof |
| CN112760707A (en) * | 2020-12-22 | 2021-05-07 | 南京师范大学 | TiO 22/PS colloidal photonic crystal, preparation method thereof and application thereof in humidity sensor |
| CN112760707B (en) * | 2020-12-22 | 2022-06-07 | 南京师范大学 | TiO 22/PS colloidal photonic crystal, preparation method thereof and application thereof in humidity sensor |
| CN113776664A (en) * | 2021-09-03 | 2021-12-10 | 大连大学 | Preparation method of photonic crystal sensor for rapidly detecting ultraviolet intensity |
| CN113776664B (en) * | 2021-09-03 | 2024-03-08 | 大连大学 | Preparation method of photonic crystal sensor for rapidly detecting ultraviolet intensity |
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