CN102062750A - Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array - Google Patents
Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array Download PDFInfo
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- CN102062750A CN102062750A CN 201010567118 CN201010567118A CN102062750A CN 102062750 A CN102062750 A CN 102062750A CN 201010567118 CN201010567118 CN 201010567118 CN 201010567118 A CN201010567118 A CN 201010567118A CN 102062750 A CN102062750 A CN 102062750A
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Abstract
The invention discloses a room temperature formaldehyde gas sensor based on a titanium dioxide nanotube array, belonging to the technical field of electron gas sensitive devices. The room temperature formaldehyde gas sensor is characterized in that the titanium dioxide nanotube array is used as a sensitive element, two parallel metal electrodes are made on the titanium dioxide nanotube array; the working temperature of the sensor is between 15 DEG C and 30 DEG C, the relative humidity range of the working environment is 30-90 percent; and a sensor signal is used for measuring the change of a resistance value of the titanium dioxide nanotube array in an air atmosphere and a formaldehyde gas atmosphere using air as a background. The invention has the advantages of realizing that the content of trace formaldehyde gas in other two interference gases at room temperature is detected by using the titanium dioxide nanotube array with high specific surface area, greatly reducing the power consumption of the sensor during the use, and improving the convenience of using the sensor.
Description
Technical field
The invention belongs to electron gas sensing device technical field, relate to a kind of room temperature formaldehyde gas sensor based on Nano tube array of titanium dioxide.
Background technology
Formaldehyde is a kind of to the healthy organic volatile that very big harm is arranged, and therefore develop cheap portable formaldehyde gas sensor is the demand of sensor field always.Conventional based on metal-oxide semiconductor (MOS) sensitive material such as SnO
2, WO
3, LaFe
1-xZn
xO
3, NiO, CdO-In
2O
3The formaldehyde sensor of and ZnO shows good sensitivity.But the working temperature of sensor requires to increase the demand to power consumption greatly more than 200 ℃, and is totally unfavorable to the portable use of sensor.Titania nanotube relies on characteristics such as effect because it has high-specific surface area, high-aspect-ratio and size, more and more is subjected to people's attention in recent years.In the gas sensor application facet, people after deliberation based on titania nanotube to hydrogen, the sensitivity of low content oxygen and humidity.At the high problem of common metal oxide semiconductor formaldehyde sensor power consumption, the present invention utilizes the excellent physical chemistry performance of titania nanotube, developed the formaldehyde sensor of at room temperature working, this sensor requires low to energy consumption, common airborne interference gas is had good selection performance such as ethanol and ammonia.
Summary of the invention
The purpose of this invention is to provide a kind of room temperature formaldehyde gas sensor based on Nano tube array of titanium dioxide.The technical matters that solves is to utilize the Nano tube array of titanium dioxide with high-specific surface area, realizes at room temperature reaching and detect trace formaldehyde content in other two kinds of interference gas.
Technical scheme of the present invention is that at first to prepare with Nano tube array of titanium dioxide be the formaldehyde sensor of responsive element, utilizes the method for the electrochemical anodic oxidation Nano tube array of titanium dioxide of growing on the Titanium substrate.Then, on the Nano tube array of titanium dioxide of preparation, utilize the method for serigraphy to make two parallel metal electrodes arranged side by side, two electrodes as sensor obtain final formaldehyde sensor.The working temperature of sensor is in 15-30 ℃ of scope, and the relative humidity scope of working environment is 30-90%.Sensor signal is that the resistance value of measuring Nano tube array of titanium dioxide is the variation under the formaldehyde gas atmosphere of background at air with the air.
Effect of the present invention and benefit are, utilization has the Nano tube array of titanium dioxide of high-specific surface area, realized at room temperature reaching and in other two kinds of interference gas, detected trace formaldehyde content, greatly reduced the power consumption in the sensor use, improved the portability that sensor uses.
Description of drawings
Among the figure: the 1st, the response resistance variations of sensor under air atmosphere; The 2nd, sensor is an air in background, and formaldehyde is dense to be response resistance variations under the atmosphere of 10ppm; The 3rd, sensor is an air in background, and concentration of formaldehyde is the response resistance variations under the atmosphere of 20ppm; The 4th, sensor is an air in background, and concentration of formaldehyde is the response resistance variations under the atmosphere of 30ppm; The 5th, sensor is an air in background, and concentration of formaldehyde is the response resistance variations under the atmosphere of 40ppm; The 6th, sensor is an air in background, and concentration of formaldehyde is the response resistance variations under the atmosphere of 50ppm.
Accompanying drawing 2 is that sensor is at room temperature to the sensitivity curve map of the formaldehyde of variable concentrations.
Accompanying drawing 3 is sensor comparison diagrams of the induced signal of PARA FORMALDEHYDE PRILLS(91,95) and two kinds of interference gas ethanol and ammonia at room temperature.
Among the figure: the 1st, 1000ppm ethanol; The 2nd, the formaldehyde of 50ppm; The 3rd, the 50ppm ammonia.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The method of the electrochemical anodic oxidation Nano tube array of titanium dioxide of on the Titanium substrate, growing.Experiment preparation purity is 99.4% industrially pure titanium metal titanium substrate, uses abrasive material to be made into metal mirror material.Carry out polishing then, make its degreasing, carry out the ultrasonication cleaning, use washed with de-ionized water with absolute ethyl alcohol with acetone, each 10min removes grease, dries up in air at room temperature in order to usefulness in the experiment afterwards.Before anodic oxidation experiment, the titanium surface to pass through the NaOH mixed solution (0.06 mole/L) and the chemical treatment of hydrogen peroxide (15wt%).The anodic oxidation experiment is carried out in a columniform electrochemical reactor, adopts two electrode systems, and power supply is a constant-voltage DC source, and the titanium sheet is an anode, and stainless steel substrates is a negative electrode, keeps two interelectrode distance 3cm.Under the room temperature, the titanium plate is containing the sodium fluoride of 0.5wt%, the Na of 0.2mol/L
2SO
4In the glycerine electrolytic solution of some, control experiment parameter: under the 30V constant voltage, carry out 3 hours electrochemical anodic oxidation.Through anodic oxidation, titania nanotube under different temperatures, anneal (400,500 and 600 ℃) be the sign form in 2 hours.Earlier use soaked in absolute ethyl alcohol then, use a large amount of deionized water rinsing samples again, dried for standby.
The preparation sensor.Utilize the method for serigraphy to stamp two parallel 2-3 millimeter silver slurry lines that are spaced apart on the Nano tube array of titanium dioxide surface,, obtain final formaldehyde sensor then 150 ℃ of following thermal treatments 1 hour.
The test of sensor.Prepared sensor is placed under the mobile air atmosphere, humidity is between 30-90%, the operating temperature range of sensor element is introduced the formaldehyde gas molecule of variable concentrations then between 15-30 ℃, perhaps these two kinds of interference gas molecules of the ammonia of the ethanol of 1000ppm and 50ppm.By utilizing of the variation of digital multimeter survey sensor, as the signal of sensor in air and the resistance value under the formaldehyde atmosphere of variable concentrations that with the air is background.Accompanying drawing 1 has provided formaldehyde sensor at room temperature to be changed the formaldehyde electrical response in time of variable concentrations, and the response time of sensor is 3-4 minute; Accompanying drawing 2 has provided formaldehyde sensor at room temperature to the sensitivity curve map of the formaldehyde of variable concentrations.The sensitivity of sensor is 0.8/ppm; Accompanying drawing 3 has provided the sensor comparison diagram of the induced signal of PARA FORMALDEHYDE PRILLS(91,95) and two kinds of interference gas ethanol and ammonia at room temperature.The sensor of being developed at room temperature shows good formaldehyde sensitivity and to the selection performance of ethanol and ammonia.
Claims (1)
1. the room temperature formaldehyde gas sensor based on Nano tube array of titanium dioxide is characterized in that Nano tube array of titanium dioxide is responsive element, makes two parallel metal electrodes arranged side by side on Nano tube array of titanium dioxide; The working temperature of sensor is in 15-30 ℃ of scope, and the relative humidity scope of working environment is 30-90%; Sensor signal is that the resistance value of measuring Nano tube array of titanium dioxide is the variation under the formaldehyde gas atmosphere of background at air with the air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010567118 CN102062750A (en) | 2010-11-22 | 2010-11-22 | Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010567118 CN102062750A (en) | 2010-11-22 | 2010-11-22 | Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array |
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| CN 201010567118 Pending CN102062750A (en) | 2010-11-22 | 2010-11-22 | Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array |
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Cited By (6)
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|---|---|---|---|---|
| WO2013185440A1 (en) * | 2012-06-11 | 2013-12-19 | 江苏大学 | Method for manufacturing gas sensor based on dye-sensitized tio2 film |
| CN105758994A (en) * | 2016-02-25 | 2016-07-13 | 济南大学 | Preparation method and application of formaldehyde gas sensor based on carbon nitride-loaded manganese-doped two-dimensional nanocomposite |
| CN108914186A (en) * | 2018-07-06 | 2018-11-30 | 江西洪都航空工业集团有限责任公司 | A kind of titanium alloy blue anodic oxidation method of environmental protection fast filming |
| CN109374699A (en) * | 2018-12-05 | 2019-02-22 | 合肥学院 | A kind of Portable type room formaldehyde examination device |
| CN113670991A (en) * | 2021-09-08 | 2021-11-19 | 大连理工大学 | Hematite-based single crystal room temperature gas-sensitive material exposing high-energy crystal face, and preparation method and application thereof |
| CN114740146A (en) * | 2021-01-08 | 2022-07-12 | 宁波方太厨具有限公司 | Formaldehyde detection method and formaldehyde detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013185440A1 (en) * | 2012-06-11 | 2013-12-19 | 江苏大学 | Method for manufacturing gas sensor based on dye-sensitized tio2 film |
| GB2518308A (en) * | 2012-06-11 | 2015-03-18 | Univ Jiangsu | Method for manufacturing gas sensor based on dye-sensitized TIO2 film |
| GB2518308B (en) * | 2012-06-11 | 2020-12-09 | Univ Jiangsu | Method for manufacturing gas sensors based on dye-sensitized TIO2 film |
| CN105758994A (en) * | 2016-02-25 | 2016-07-13 | 济南大学 | Preparation method and application of formaldehyde gas sensor based on carbon nitride-loaded manganese-doped two-dimensional nanocomposite |
| CN105758994B (en) * | 2016-02-25 | 2017-06-30 | 济南大学 | A kind of preparation method and application of the formaldehyde gas sensor based on carbonitride load additive Mn two-dimensional nano composite |
| CN108914186A (en) * | 2018-07-06 | 2018-11-30 | 江西洪都航空工业集团有限责任公司 | A kind of titanium alloy blue anodic oxidation method of environmental protection fast filming |
| CN109374699A (en) * | 2018-12-05 | 2019-02-22 | 合肥学院 | A kind of Portable type room formaldehyde examination device |
| CN114740146A (en) * | 2021-01-08 | 2022-07-12 | 宁波方太厨具有限公司 | Formaldehyde detection method and formaldehyde detection device |
| CN113670991A (en) * | 2021-09-08 | 2021-11-19 | 大连理工大学 | Hematite-based single crystal room temperature gas-sensitive material exposing high-energy crystal face, and preparation method and application thereof |
| CN113670991B (en) * | 2021-09-08 | 2024-01-30 | 大连理工大学 | Hematite-based monocrystal room temperature gas-sensitive material exposing high-energy crystal face, and preparation method and application thereof |
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Application publication date: 20110518 |