CN105403291A - Zinc oxide nanofiber QCM ultraviolet photosensitive sensor and preparation method thereof - Google Patents
Zinc oxide nanofiber QCM ultraviolet photosensitive sensor and preparation method thereof Download PDFInfo
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- CN105403291A CN105403291A CN201510724578.6A CN201510724578A CN105403291A CN 105403291 A CN105403291 A CN 105403291A CN 201510724578 A CN201510724578 A CN 201510724578A CN 105403291 A CN105403291 A CN 105403291A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
- G01G3/165—Constructional details
Abstract
The invention discloses a zinc oxide nanofiber QCM ultraviolet photosensitive sensor and a preparation method thereof. The sensor is a QCM quality-type sensor, and an electro spinning nano zinc oxide filer film is taken as a sensitive material of the quartz crystal microbalance (QCM) quality type sensor. The sensor does not need to prepare an electrode on the photosensitive material, defects of complex preparation technology and high cost of an existing resistance type ultraviolet photosensitive sensor are overcome, the device also has the advantages of the simple preparation method, short response time, high sensitivity, simple operation and the like at the same time, and a new method is provided for preparation of a high-performance ultraviolet light sensor.
Description
Technical field
The invention belongs to QCM (Quartz Crystal Microbalance) (QCM) sensor field, be specifically related to a kind of zinc oxide nano fiber QCM ultraviolet light dependent sensor and preparation method thereof.
Background technology
Light sensor is one of modal sensor, and optical sensor is one of maximum, most widely used sensor of current production rate, and it is automatically controlling and is occupying very important status in non-electrical quantity measurement technology.The photochromics that its main element photoresistance can be changed under light illumination by electric property is made, zinc paste is a kind of wide bandgap semiconductor materials, energy gap is 3.37eV, do not respond at visible ray and infrared region, all there is very high absorptivity at below wavelength 370nm, this to ultraviolet light dependent sensor can under visible ray and Infrared background sensitive detection uitraviolet intensity particularly important, be therefore often used to prepare resistor-type ultraviolet light dependent sensor.In recent years, because nano material has the advantage that size is little, specific surface area is larger, people were devoted to the light sensitive material preparing synthesis of nano structure gradually, and were applied in light sensor, to improve its light sensor characteristic.The test of current light sensor generally adopts the resis tance method of surveying, such as Chinese patent (application number: 201110004415.2) disclose the ultraviolet light detector of a kind of hydrothermal growth zinc oxide nano array, Chinese patent (application number: 201310655536.2) disclose preparing zinc oxide nanometer film prepared by a kind of method of electrostatic spinning and cross on interdigital electrode, along with the increase of ultraviolet light impressed voltage causes output current to increase.But these all need to make electrode on sensitive material, for undersized nano material, also need micro-processing technology processing metal microelectrode, complicated process of preparation, involves great expense.
QCM (Quartz Crystal Microbalance) (QuartzCrystalMicrobalance, QCM) be a kind of very sensitive mass sensitive sensor, its ultimate principle is the piezoelectric property that make use of quartz-crystal resonator, the mass change of quartz crystal oscillator electrode surface material is converted into the frequency change that quartz crystal oscillator circuit exports electric signal, theoretical research shows, the resonance frequency change of QCM (Quartz Crystal Microbalance) is directly proportional to additional quality, at present, qcm sensor is just being widely used in air-sensitive and wet sensitive pick-up unit, such as Chinese patent (application number: 20131023419.3) disclose method of electrostatic spinning and prepare conductive polymer nanometer fiber and combine with QCM (Quartz Crystal Microbalance) technology and prepared gas sensing device.But because the current research to photochromics still rests in the change of its electric property under illumination condition, existing photochromics cannot combine with mass sensitive sensor, and QCM is not yet applied to light sensor field.
Summary of the invention
The object of the present invention is to provide a kind of zinc oxide nano fiber QCM ultraviolet light dependent sensor and preparation method thereof, this device is mass type sensor, without the need to preparing electrode on the photosensitive material, overcome existing resistor-type ultraviolet light dependent sensor complicated process of preparation, shortcoming that cost is high, it is simple that this device has preparation method simultaneously, and the response time is short, highly sensitive, simple operation and other advantages, for making the method that high performance ultraviolet light transducer provides new.
To achieve these goals, technical scheme provided by the invention is as follows:
A kind of zinc oxide nano fiber QCM ultraviolet light dependent sensor, this sensor is QCM mass type sensor, using electrospun nanofiber zinc oxide fiber film as the sensitive material of QCM (Quartz Crystal Microbalance) QCM mass type sensor.
Inventor find in long-term experiment electrospun nanofiber zinc oxide fiber film under UV-irradiation condition not only its electric property can change, its quality also can change, inventor thinks through the combining with theoretical analysis that studies for a long period of time, when this performance is due to UV-irradiation, electronics-double-void is produced in zinc oxide nano fiber, some rooms and Lattice Oxygen are reacted, form Surface Oxygen hole, these defects are more partial to the absorption to hydroxy, enhance the water wettability of zinc oxide surface, make the hydrone in its easier absorbed air, the gross mass of material is caused to increase, electrospun nanofiber zinc oxide fiber film has the large feature of specific surface area compared to other zinc oxide material simultaneously, enhance the contact probability of water in air molecule and material, effectively enhance the ability that material absorbs water in air molecule.Utilize this performance of material, it is made to combine with high-sensitive mass type sensor QCM, using the sensitive material of electrospun nanofiber zinc oxide fiber film as QCM (Quartz Crystal Microbalance), by the irradiation of ultraviolet light to sensitive material, sensitive material electronic state is changed, causes the absorption of sensitive material and water in air molecule, cause its quality to change, thus affect the change of QCM resonance frequency, namely can be made into high-sensitive ultraviolet light dependent sensor.
Further, the fiber diameter of described electrospun nanofiber zinc oxide fiber film is 100 ~ 400 nanometers.
The invention also discloses the preparation method of above-mentioned zinc oxide nano fiber QCM ultraviolet light dependent sensor, comprise the following steps:
(1) zinc oxide nano fiber sensitive layer preparation: macromolecular material is dissolved in the solution A of joining in solvent, described solvent and water dissolve each other, again zinc acetate, deionized water are mixed with solution A, heating is stirred to zinc acetate and dissolves completely, obtain the precursor spinning solution of zinc paste, obtain As-deposited state zinc oxide nano fiber with method of electrostatic spinning, then utilize muffle furnace to carry out sintering and obtain zinc oxide nano fiber film, be zinc oxide nano fiber sensitive layer;
(2) assembling of QCM ultraviolet light dependent sensor: the electrode surface of QCM (Quartz Crystal Microbalance) is cleaned up with absolute ethyl alcohol or acetone, liquid medium is dripped on the electrode of QCM (Quartz Crystal Microbalance) after its drying, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, after its drying, namely obtain electrospinning zinc oxide nano fiber QCM ultraviolet light dependent sensor, described liquid medium is one or more in water, ethanol, acetone.
The zinc oxide nano fiber QCM ultraviolet light dependent sensor that said method is obtained, the UV-irradiation adopting wavelength to be respectively 365nm and 254nm detects, record ultraviolet light when opening-close, the QCM vibration frequency change response recovery characteristics curve of sample, find that the response time of device to ultraviolet light is short, responsiveness is very high, has well repeatability and stability.
Further, the macromolecular material in step (1) is one or more in polyvinylpyrrolidone, polyvinyl alcohol (PVA), polycaprolactone, polyoxyethylene, polymethylmethacrylate, polystyrene, Kynoar, collagen, gelatin, polyglycol.
Further, prepared by described step (1) zinc oxide nano fiber sensitive layer: be dissolved in absolute ethyl alcohol by the tygon pyrrole network alkane ketone of relative molecular weight 1,300,000, magnetic stirring apparatus fully stirs, and obtained tygon pyrrole network alkane ketone content is the solution A of 10wt%; Zinc acetate, deionized water are mixed with solution A, heat and be stirred to zinc acetate and dissolve completely, preparation obtains the presoma spinning solution of zinc paste; At room temperature, obtain As-deposited state zinc oxide nano fiber with method of electrostatic spinning, spinning nozzle is from the distance 8-15cm of collector, and spinning voltage is 20-30kV; Gained As-deposited state zinc oxide nano fiber utilizes muffle furnace to carry out sintering and obtains zinc oxide nano fiber film.
Further, prepared by described step (1) zinc oxide nano fiber sensitive layer: be first dissolved in 8.5 grams of absolute ethyl alcohols by the polyvinylpyrrolidone of the relative molecular weight 1300000 of 1.2 grams, be placed in triangular flask A, and under the condition of 60 DEG C of water-baths, add thermal agitation 4 hours, obtain solution A, 1.2 grams of zinc acetates are added in the triangular flask B that 2 grams of absolute ethyl alcohols and 0.45 gram of deionized water are housed, stir 2 hours under magnetic stirring apparatus, obtain inorganic salt solution B, the Polymer Solution A be mixed with and inorganic salt solution B, and fully stir 2 hours with magnetic stirring apparatus, obtain the presoma spinning solution of homogeneous zinc paste, the positive pole of the high-voltage power supply of electrostatic spinning apparatus connects syringe needle point, negative pole receives collector, described collection is silicon chip or aluminium foil very, the presoma spinning solution of zinc paste adds in syringe, spinning nozzle is from the distance 13.5 centimetres of collector, spinning voltage is 25 kilovolts, humid control is below 60%, open high-voltage electric switch, nanometer zinc oxide precursor fiber can be obtained on collector, the zinc oxide precursor fiber of collection is placed on silicon chip, again silicon chip is put into muffle furnace, 800 DEG C are warmed up to through 200 minutes, 2 hours are incubated in 800 DEG C (air atmosphere), cool with stove after having sintered and obtain zinc oxide nano fiber film.
Further, the assembling of described step (2) QCM ultraviolet light dependent sensor: first quartz wafer is cleaned up with absolute ethyl alcohol, ethanol is dripped on the electrode of QCM (Quartz Crystal Microbalance) after drying up with hair-dryer, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, natural air drying in air, obtains zinc oxide nano fiber QCM ultraviolet light dependent sensor.
Cleaning Principle of the present invention is:
QCM (Quartz Crystal Microbalance) QCM can carry out extremely sensitive mass measurement, have highly sensitive, the response time is fast and the advantage such as easy to operate.QCM utilizes the sensitive membrane adsorbed water molecule of its finishing, mass change is caused to cause the change of resonant frequency, measurement result can output on computer by electrochemical quartz crystal microbalance (EQCM), computer is gathered output frequency by software, process and draw response curve, thus realizes the detection of humidity.For CHI400C Series Electrochemical QCM (Quartz Crystal Microbalance), its potential range is ± 10 volts, and range of current is ± 250 milliamperes.Current measurement lower limit is pacified lower than 50 skins.Under suitable condition, between mass change quartz crystal deposited and vibration frequency move, relation is simple linear relationship.Zinc oxide nano fiber QCM ultraviolet light dependent sensor of the present invention, the frequency shift of every hertz is equivalent to quality and changes 1.34 nanograms.
Beneficial effect of the present invention is: the invention provides a kind of zinc oxide nano fiber QCM ultraviolet light dependent sensor and preparation method thereof, this device is mass type sensor, without the need to preparing electrode on the photosensitive material, overcome existing resistor-type ultraviolet light dependent sensor complicated process of preparation, shortcoming that cost is high, it is simple that this device has preparation method simultaneously, and the response time is short, highly sensitive, simple operation and other advantages, provides new method for making high performance ultraviolet light transducer.Specifically:
1) still rest in the change of its electric property under illumination condition to the research of photochromics at present, resistance type sensor needs to make electrode on sensitive material, with regard to miniature electricity device, needs micro-processing technology processing metal microelectrode, complicated process of preparation, involves great expense.Inventor find in long-term experiment electrospun nanofiber zinc oxide fiber film under UV-irradiation condition not only its electric property can change, its quality also can change, inventor infers, when this performance is due to UV-irradiation, electronics-double-void is produced in zinc oxide nano fiber, some rooms and Lattice Oxygen are reacted, form Surface Oxygen hole, these defects are more partial to the absorption to hydroxy, enhance the water wettability of zinc oxide surface, make the molecule in its easier absorbed air, the gross mass of material is caused to increase, electrospun nanofiber zinc oxide fiber film has the large feature of specific surface area compared to other zinc oxide material simultaneously, enhance the contact probability of molecule in air and material, effectively enhance the ability that material absorbs air Middle molecule.Utilize this performance of material, it is made to combine with high-sensitive mass type sensor QCM, using the sensitive material of electrospun nanofiber zinc oxide fiber film as QCM (Quartz Crystal Microbalance), by the irradiation of ultraviolet light to sensitive material, sensitive material electronic state is changed, cause the absorption of sensitive material and air Middle molecule, its quality is caused to change, thus affect the change of QCM resonance frequency, namely can be made into high-sensitive ultraviolet light dependent sensor, compared to traditional light sensor, this sensor construction is simple, without the need to preparing electrode on sensitive material, preparation method is simple, had qcm sensor concurrently simple to operate simultaneously, highly sensitive, the advantage that response time is short.
2) sensor of the present invention adopts method of electrostatic spinning to prepare zinc paste sensitive material, and preparation method is simple, and principle is reliable, simple and efficient to handle, practical.
3) frequency change of QCM is made period measurement by sensor of the present invention, shortens the sampling time, improves time resolution.
Accompanying drawing explanation
Fig. 1 is for the present invention relates to zinc oxide nano fiber film electron scanning micrograph.
Fig. 2 wavelength is QCM (Quartz Crystal Microbalance) vibration frequency change response-recovery family curve under 254nm UV-irradiation.
Fig. 3 wavelength is QCM (Quartz Crystal Microbalance) vibration frequency change response-recovery family curve under 365nm UV-irradiation.
Embodiment
According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, concrete material proportion, process conditions and result thereof described by embodiment only should can not limit the present invention described in detail in claims yet for illustration of the present invention.
Embodiment 1
A preparation method for zinc oxide nano fiber QCM ultraviolet light dependent sensor, comprises the following steps:
(1) zinc oxide nano fiber sensitive layer preparation: first the polyvinylpyrrolidone of the relative molecular weight 1,300,000 of 1.2 grams is dissolved in 8.5 grams of absolute ethyl alcohols, be placed in triangular flask A, and under the condition of 60 DEG C of water-baths, add thermal agitation 4 hours, obtain solution A, 1.2 grams of zinc acetates are added in the triangular flask B that 2 grams of absolute ethyl alcohols and 0.45 gram of deionized water are housed, stir 2 hours under magnetic stirring apparatus, obtain inorganic salt solution B, the Polymer Solution A be mixed with and inorganic salt solution B, and fully stir 2 hours with magnetic stirring apparatus, obtain the presoma spinning solution of homogeneous zinc paste, the positive pole of the high-voltage power supply of electrostatic spinning apparatus connects syringe needle point, negative pole receives collector, described collection is silicon chip or aluminium foil very, the presoma spinning solution of zinc paste adds in syringe, spinning nozzle is from the distance 13.5 centimetres of collector, spinning voltage is 25 kilovolts, humid control is below 60%, open high-voltage electric switch, nanometer zinc oxide precursor fiber can be obtained on collector, the zinc oxide precursor fiber of collection is placed on silicon chip, again silicon chip is put into muffle furnace, 800 DEG C are warmed up to through 200 minutes, 2 hours are incubated in 800 DEG C (air atmosphere), cool with stove after having sintered and obtain zinc oxide nano fiber film.The electron scanning micrograph of gained zinc oxide nano fiber film as shown in Figure 1.
(2) assembling of QCM ultraviolet light dependent sensor: first the quartz wafer of electrochemical quartz crystal microbalance (CHI400C series) is cleaned up with absolute ethyl alcohol, ethanol is dripped on the electrode of electrochemical quartz crystal microbalance after drying up with hair-dryer, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, natural air drying in air, obtains zinc oxide nano fiber QCM ultraviolet light dependent sensor.
Light sensitive characteristic is tested: under different wave length ultraviolet light, irradiate QCM be respectively modified with zinc oxide nano fiber film sensitive layer, and measure its light sensitive characteristic, measurement result is outputted on computer, computer is gathered output frequency by software, process and draw response curve, thus realizes the detection to ultraviolet-sensitive characteristic.As shown in Figures 2 and 3 for respectively when 254nm and 365nm length ultraviolet light is opened-closed, the QCM vibration frequency change response-recovery family curve of sample, can find out that this light sensor is very responsive to ultraviolet light; During illumination, the response time is about 5 seconds, is about 2 seconds release time, and loop-around data repeatability very well.
Embodiment 2
A preparation method for zinc oxide nano fiber QCM ultraviolet light dependent sensor, comprises the following steps:
(1) zinc oxide nano fiber sensitive layer preparation: first the polyoxyethylene PEO (relative molecular mass 5,000,000) of 1 gram is dissolved in deionized water, be placed in triangular flask A, under room temperature, by magnetic stirrer 4 hours, obtain solution A, 1.2 grams of zinc acetates are added in the triangular flask B that 2 grams of absolute ethyl alcohols and 0.45 gram of deionized water are housed, stir 2 hours under magnetic stirring apparatus, obtain inorganic salt solution B, the Polymer Solution A be mixed with and inorganic salt solution B, and fully stir 2 hours with magnetic stirring apparatus, obtain the presoma spinning solution of homogeneous zinc paste, the positive pole of the high-voltage power supply of electrostatic spinning apparatus connects syringe needle point, negative pole receives collector, described collection is silicon chip or aluminium foil very, the presoma spinning solution of zinc paste adds in syringe, spinning nozzle is from the distance 15 centimetres of collector, spinning voltage is 30 kilovolts, humid control is below 60%, open high-voltage electric switch, nanometer zinc oxide precursor fiber can be obtained on collector, the zinc oxide precursor fiber of collection is placed on silicon chip, again silicon chip is put into muffle furnace, 800 DEG C are warmed up to through 200 minutes, 2 hours are incubated in 800 DEG C (air atmosphere), cool with stove after having sintered and obtain zinc oxide nano fiber film.
(2) assembling of QCM ultraviolet light dependent sensor: first the quartz wafer of electrochemical quartz crystal microbalance (CHI400C series) is cleaned up with acetone, ethanol is dripped on the electrode of electrochemical quartz crystal microbalance after drying up with hair-dryer, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, natural air drying in air, obtain zinc oxide nano fiber QCM ultraviolet light dependent sensor, test through photosensitive property, during the illumination of this sample, the response time is about 4 seconds, be about 2 seconds release time, and loop-around data repeatability very well.
The above; be only explanation embodiment of the present invention; not to any formal and substantial restriction of the present invention; should be understood that; for those skilled in the art; under the prerequisite not departing from the inventive method, the some improvement made and supplement also should be considered as protection scope of the present invention.All those skilled in the art, without departing from the spirit and scope of the present invention, a little change utilizing disclosed above technology contents to make, the equivalent variations of modifying and developing, be Equivalent embodiments of the present invention; Meanwhile, all according to substantial technological of the present invention to the change of any equivalent variations that above-described embodiment does, modify and differentiation, all still belong to the scope of technical scheme of the present invention.The not detailed open place of the present invention is prior art.
Claims (7)
1. a zinc oxide nano fiber QCM ultraviolet light dependent sensor, is characterized in that, this sensor is QCM mass type sensor, using electrospun nanofiber zinc oxide fiber film as the sensitive material of QCM (Quartz Crystal Microbalance) QCM mass type sensor.
2. a kind of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 1, it is characterized in that, the fiber diameter of described electrospun nanofiber zinc oxide fiber film is 100 ~ 400 nanometers.
3. the preparation method of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 1 or 2, is characterized in that, comprise the following steps:
(1) zinc oxide nano fiber sensitive layer preparation: macromolecular material is dissolved in the solution A of joining in solvent, described solvent and water dissolve each other, again zinc acetate, deionized water are mixed with solution A, heating is stirred to zinc acetate and dissolves completely, obtain the precursor spinning solution of zinc paste, obtain As-deposited state zinc oxide nano fiber with method of electrostatic spinning, then utilize muffle furnace to carry out sintering and obtain zinc oxide nano fiber film, be zinc oxide nano fiber sensitive layer;
(2) assembling of QCM ultraviolet light dependent sensor: the electrode surface of QCM (Quartz Crystal Microbalance) is cleaned up with absolute ethyl alcohol or acetone, liquid medium is dripped on the electrode of QCM (Quartz Crystal Microbalance) after its drying, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, after its drying, namely obtain electrospinning zinc oxide nano fiber QCM ultraviolet light dependent sensor, described liquid medium is one or more in water, ethanol, acetone.
4. the preparation method of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 3, it is characterized in that, the macromolecular material in step (1) is one or more in polyvinylpyrrolidone, polyvinyl alcohol (PVA), polycaprolactone, polyoxyethylene, polymethylmethacrylate, polystyrene, Kynoar, collagen, gelatin, polyglycol.
5. the preparation method of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 3, it is characterized in that, prepared by described step (1) zinc oxide nano fiber sensitive layer: be dissolved in absolute ethyl alcohol by the polyvinylpyrrolidone of relative molecular weight 1,300,000, magnetic stirring apparatus fully stirs, and obtained polyvinyl pyrrolidone content is the solution A of 10wt%; Zinc acetate, deionized water are mixed with solution A, heat and be stirred to zinc acetate and dissolve completely, preparation obtains the presoma spinning solution of zinc paste; At room temperature, obtain As-deposited state zinc oxide nano fiber with method of electrostatic spinning, spinning nozzle is from the distance 8-15cm of collector, and spinning voltage is 20-30kV; Gained As-deposited state zinc oxide nano fiber utilizes muffle furnace to carry out sintering and obtains zinc oxide nano fiber film.
6. the preparation method of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 3, it is characterized in that, prepared by described step (1) zinc oxide nano fiber sensitive layer: be first dissolved in 8.5 grams of absolute ethyl alcohols by the polyvinylpyrrolidone of the relative molecular weight 1,300,000 of 1.2 grams, be placed in triangular flask A, and under the condition of 60 DEG C of water-baths, add thermal agitation 4 hours, obtain solution A, 1.2 grams of zinc acetates are added in the triangular flask B that 2 grams of absolute ethyl alcohols and 0.45 gram of deionized water are housed, stir 2 hours under magnetic stirring apparatus, obtain inorganic salt solution B, the Polymer Solution A be mixed with and inorganic salt solution B, and fully stir 2 hours with magnetic stirring apparatus, obtain the presoma spinning solution of homogeneous zinc paste, the positive pole of the high-voltage power supply of electrostatic spinning apparatus connects syringe needle point, negative pole receives collector, described collection is silicon chip or aluminium foil very, the presoma spinning solution of zinc paste adds in syringe, spinning nozzle is from the distance 13.5 centimetres of collector, spinning voltage is 25 kilovolts, humid control is below 60%, open high-voltage electric switch, nanometer zinc oxide precursor fiber can be obtained on collector, the zinc oxide precursor fiber of collection is placed on silicon chip, again silicon chip is put into muffle furnace, 800 DEG C are warmed up to through 200 minutes, 2 hours are incubated in 800 DEG C (air atmosphere), cool with stove after having sintered and obtain zinc oxide nano fiber film.
7. the preparation method of zinc oxide nano fiber QCM ultraviolet light dependent sensor as claimed in claim 3, it is characterized in that, the assembling of described step (2) QCM ultraviolet light dependent sensor: first quartz wafer is cleaned up with absolute ethyl alcohol, ethanol is dripped on the electrode of QCM (Quartz Crystal Microbalance) after drying up with hair-dryer, and the zinc oxide nano fiber film that step (1) is obtained is directly applied ointment or plaster in the above, natural air drying in air, obtains zinc oxide nano fiber QCM ultraviolet light dependent sensor.
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| CN110376253A (en) * | 2019-07-26 | 2019-10-25 | 华中科技大学 | A kind of humidity sensor, preparation method and wet sensitive type switch trigger |
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