CN111665278A - Hydrogen sulfide gas sensor for medical inspection waste pre-alarming - Google Patents
Hydrogen sulfide gas sensor for medical inspection waste pre-alarming Download PDFInfo
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- CN111665278A CN111665278A CN202010488793.1A CN202010488793A CN111665278A CN 111665278 A CN111665278 A CN 111665278A CN 202010488793 A CN202010488793 A CN 202010488793A CN 111665278 A CN111665278 A CN 111665278A
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- hydrogen sulfide
- sulfide gas
- gas sensor
- nanofiber
- warning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
Abstract
The invention relates to the technical field of gas detection, and discloses a hydrogen sulfide gas sensor for pre-alarming medical inspection waste, which comprises a square conductive substrate 1, a nanofiber sensitive film 2 and a metal grid 3. The nanofiber sensitive membrane 2 is arranged between the square conductive substrate 1 and the metal grid 3 and is connected through strong heat-resistant conductive adhesive. The nanofiber sensitive film takes a polyvinyl alcohol film as a base material. The nanofiber sensitive film is loaded with glycerin and tungsten oxide nanopowder. The hydrogen sulfide gas sensor has the advantages of high sensitivity, strong selectivity, short response time and low power consumption.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a hydrogen sulfide gas sensor for pre-alarming medical inspection waste.
Background
Hydrogen sulfide (H)2S) is a colorless, flammable, highly toxic, pungent odor gas. The toxicity of hydrogen sulfide gas is neurotoxicity, and has strong irritation effect on mucous membrane. Inhalation of small amounts of highly concentrated hydrogen sulfide gas can be fatal in a short time. Low concentrations of hydrogen sulfide gas have an effect on the eye, respiratory system and central nervous system.
In recent years, hydrogen sulfide sensitive materials based on oxide semiconductors have received much attention, and have achieved great progress in key performance indicators such as sensitivity and selectivity. Chinese patent (patent publication No. CN 105717168B) preparation method and application of hydrogen sulfide gas sensor based on titanium dioxide nanosheet supported noble metal, and cerium and manganese double-metal co-doped titanium dioxide nanosheet in-situ composite carbon nitride two-dimensional nanocomposite CeMn-TiO2/g-C3N4The hydrogen sulfide gas sensor with high sensitivity and quick response is prepared by loading silver nanoparticles, and the sensor is complex in preparation process and high in cost. Chinese patent (patent publication No. CN 110510657A) copper oxide microsphere structure, hydrogen sulfide gas sensor and preparation method thereof prepares a high-sensitivity hydrogen sulfide gas sensor by using copper oxide in microsphere structure as sensitive material. Because the porous hierarchical structure or the nano-particle modification generally increases the surface active sites, and the response to various gas molecules is enhanced, the traditional high-sensitivity hydrogen sulfide gas sensor based on the oxide semiconductor has the problems of poor selection, poor stability and poor consistency. Chinese patent (patent publication No. CN110615693A) discloses a hydrogen sulfide gas sensing material, a sensor, a preparation method and a use method, wherein the hydrogen sulfide gas sensor is prepared on the basis of a p-type delafossite sensitive layer and a planar ceramic plate deposited with interdigital test electrodes, and the sensor has high reaction temperature and high energy consumption.
The sensor aims to solve the problems of poor selectivity and high energy consumption of the existing hydrogen sulfide gas sensor. Research has found that the organic-inorganic hybrid material has the characteristics of high sensitivity, strong selectivity, fast response, low power consumption and the like, and is one of the most promising materials for preparing high-performance hydrogen sulfide gas sensors. The patent discloses a hydrogen sulfide gas sensor for medical examination waste pre-alarming. The sensing element of the hydrogen sulfide gas sensor is a polyvinyl alcohol nanofiber sensitive film loaded with tungsten oxide nano powder and glycerin. The sensing element of the hydrogen sulfide gas sensor has high surface area, porosity and electron affinity, namely, a large amount of oxygen ions are easily adsorbed on the surface of the sensing element. When the sensing element is exposed to hydrogen sulfide gas, the adsorbed oxygen ions interact with the hydrogen sulfide gas to release free electrons, namely, the conductivity of the nanofiber sensitive membrane is increased (the resistance is reduced), so that the current signal is increased. The hydrogen sulfide gas sensor has the characteristics of high sensitivity, strong selectivity, short response time and low power consumption, and can detect 100 ppb hydrogen sulfide gas at 40 ℃.
Disclosure of Invention
Technical problem to be solved
In order to solve the technical problems, the invention provides a hydrogen sulfide gas sensor for pre-alarming medical inspection waste, which has the characteristics of high sensitivity, strong selectivity, short response time and low power consumption, and solves the problems of low sensitivity and high power consumption of the existing hydrogen sulfide sensor.
(II) technical scheme
The invention provides a hydrogen sulfide gas sensor for medical inspection waste pre-alarming by combining the characteristics of high sensitivity, strong selectivity, short response time and low power consumption of an organic-inorganic mixed material. The sensor comprises a square conductive substrate 1, a nanofiber sensitive membrane 2 and a metal grid 3.
Preferably, both the square conductive substrate 1 and the metal grid 3 have good conductivity.
Preferably, the square conductive substrate 1 and the metal grid 3 are connection contacts of the sensor
Preferably, the nanofiber sensitive membrane is prepared by adopting an electrostatic spinning technology.
Preferably, the electrospinning solution for electrospinning is a polyvinyl alcohol solution in which glycerin and tungsten oxide nanopowder are dissolved.
Preferably, the electrospinning solution is vigorously stirred under heating until a clear and uniform solution is formed.
Preferably, the thickness of the nanofiber-sensitive film is controlled by the spinning time.
Preferably, the nanofiber-sensitive membrane is dried at a specific temperature for a certain time to remove residual moisture.
Preferably, the nanofiber-sensitive membrane has a large surface area, porosity and high electron affinity, so that oxygen molecules can be adsorbed.
Preferably, the square conductive substrate, the nanofiber sensitive membrane and the metal grid are connected by using a strong heat-resistant conductive adhesive, so that the hydrogen sulfide gas sensor is ensured to have good structural stability.
Preferably, the hydrogen sulfide gas sensor, when exposed to hydrogen sulfide gas, proceeds according to the following reaction formula:
(III) advantageous effects
Compared with the prior art, the invention provides the hydrogen sulfide gas sensor for the pre-alarming of the medical inspection waste.
1. The hydrogen sulfide gas sensor for the pre-alarming of medical inspection waste can detect 100 ppb of hydrogen sulfide gas at very low temperature (40 ℃).
2. The sensor has the characteristics of high selectivity, short response time and low power consumption.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an SEM image of the nanofiber-sensitive membrane.
FIG. 3 is a graph of the sensitivity of the present invention at different hydrogen sulfide concentrations.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Polyvinyl alcohol solution was prepared by adding 1 g of polyvinyl alcohol polymer (weight average molecular weight 61000) to 9 ml of deionized water to make a 10% by weight polyvinyl alcohol solution. An electrospinning solution was prepared by dissolving 1 g of tungsten oxide nano powder (100 nm) and 0.5 ml of glycerin (99.5%) in 9 ml of a polyvinyl alcohol solution and vigorously stirring at 90 ℃ to form a clear uniform solution, followed by cooling to room temperature. Preparing a nanofiber sensitive membrane, and filling the electrostatic spinning solution into a 10ml syringe with a No. 18 stainless steel needle to prepare the nanofiber sensitive membrane in an electrostatic spinning mode. The electrostatic spinning process parameters are as follows: the spinning distance is 10 cm; applied between the needle tip and a grounded collectorThe voltage is 12 kV; the solution flow rate was 0.5 ml/min. And drying the nanofiber sensitive membrane, wherein the nanofiber sensitive membrane is dried for 24 hours at the temperature of 60 ℃ in order to remove residual deionized water. Fig. 2 is an SEM image of the nanofiber-sensitive membrane. Preparing a hydrogen sulfide gas sensor for pre-alarming medical inspection waste, and using TD-8810 high-temperature resistant silver powder electronic conductive adhesive to mix copper sheets (
) Stainless steel grating
) And a square nanofiber-sensitive membrane (
) The three are connected, wherein the nanofiber sensitive membrane is placed in the middle.
And (3) testing the concentration of the hydrogen sulfide gas, namely exposing the hydrogen sulfide gas sensor prepared by the method in a temperature-controlled Teflon reaction chamber containing the hydrogen sulfide gas. FIG. 3 is a graph showing the sensitivity of a hydrogen sulfide gas sensor at different hydrogen sulfide concentrations at an ambient temperature of 40 ℃. To characterize the sensor sensitivity. (I)aIs the reference current, I, of the sensor exposed to the airgIs the current measured when the sensor is exposed to a hydrogen sulfide, air gas mixture. ) The sensor has very high selectivity and response time of 16.37 s.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A hydrogen sulfide gas sensor for medical inspection waste pre-alarming. Comprises a square conductive substrate 1, a nanofiber sensitive film 2 and a metal grid 3.
2. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the square conductive substrate 1 and the metal grid 3 have good conductivity.
3. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the square conductive substrate 1 and the metal grid 3 are sensor connecting contacts.
4. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the nanofiber sensitive membrane 2 is prepared by adopting an electrostatic spinning technology.
5. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the electrostatic spinning solution for electrostatic spinning is a polyvinyl alcohol solution dissolved with glycerin and tungsten oxide nano powder.
6. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the electrospinning solution needs to be stirred under heating condition until a clear and uniform solution is formed.
7. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the thickness of the nanofiber-sensitive membrane 2 is controlled by the spinning time.
8. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the nanofiber-sensitive membrane 2 needs to be subjected to a certain drying treatment.
9. The hydrogen sulfide gas sensor for medical examination waste pre-warning as claimed in claim 1, wherein: the nanofiber-sensitive membrane has a large surface area and high electron affinity.
10. The hydrogen sulfide gas sensor for the pre-alarm of medical examination waste as claimed in claim 1, wherein the square conductive substrate 1, the nanofiber sensitive membrane 2 and the metal grid 3 are connected by a strong heat-resistant conductive adhesive.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010488793.1A CN111665278A (en) | 2020-06-02 | 2020-06-02 | Hydrogen sulfide gas sensor for medical inspection waste pre-alarming |
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| CN202010488793.1A CN111665278A (en) | 2020-06-02 | 2020-06-02 | Hydrogen sulfide gas sensor for medical inspection waste pre-alarming |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004245726A (en) * | 2003-02-14 | 2004-09-02 | New Cosmos Electric Corp | Sulfur compound gas detection element |
| CN102692430A (en) * | 2012-06-07 | 2012-09-26 | 青岛大学 | Preparation method of carbon monoxide gas sensitive sensor operating in room temperature environment |
| CN105758894A (en) * | 2015-12-01 | 2016-07-13 | 中国科学院上海技术物理研究所 | Semiconductor sensor and testing circuit of hydrogen sulfide gas |
| CN111665205A (en) * | 2020-06-02 | 2020-09-15 | 李锦安 | Optical sensor for detecting formaldehyde content in milk |
-
2020
- 2020-06-02 CN CN202010488793.1A patent/CN111665278A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004245726A (en) * | 2003-02-14 | 2004-09-02 | New Cosmos Electric Corp | Sulfur compound gas detection element |
| CN102692430A (en) * | 2012-06-07 | 2012-09-26 | 青岛大学 | Preparation method of carbon monoxide gas sensitive sensor operating in room temperature environment |
| CN105758894A (en) * | 2015-12-01 | 2016-07-13 | 中国科学院上海技术物理研究所 | Semiconductor sensor and testing circuit of hydrogen sulfide gas |
| CN111665205A (en) * | 2020-06-02 | 2020-09-15 | 李锦安 | Optical sensor for detecting formaldehyde content in milk |
Non-Patent Citations (1)
| Title |
|---|
| WASEEM HITTINI 等: "Ultrasensitive and low temperature gas sensor based on electrospun organic-inorganic nanofibers", 《ORGANIC ELECTRONICS》 * |
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Application publication date: 20200915 |