CN104391007A - Gas sensor chip - Google Patents
Gas sensor chip Download PDFInfo
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- CN104391007A CN104391007A CN201410644774.8A CN201410644774A CN104391007A CN 104391007 A CN104391007 A CN 104391007A CN 201410644774 A CN201410644774 A CN 201410644774A CN 104391007 A CN104391007 A CN 104391007A
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Abstract
The invention discloses a gas sensor chip. The gas sensor chip comprises covering plates, piezoelectric substrates, an electrode sensing plate, gas sensitive membranes and a resistance heating electrode, wherein the electrode sensing plate is arranged between the piezoelectric substrates; the piezoelectric substrates are arranged between the covering plates; the covering plates and the piezoelectric substrates form an electrode conduction band; the electrode sensing plate and the covering plates form the other electrode conduction band; the resistance heating electrode is arranged between the two electrode conduction bands; the piezoelectric substrates are covered by the gas sensitive membranes. The gas sensor chip has the characteristics of high sensitivity, fast response, good selectivity, simple structure, long service life, and the like and can be designed aiming at any gas, thus overcoming the defect that traditional gas sensors can not have more properties at the same time.
Description
Technical field
The invention belongs to the technical field of sensor chip, in particular to a kind of gas sensor chip.
Background technology
Along with the raising day by day of automobile emission regulation, require also more and more higher to exhaust gas measuring, the cold start-up time that demand of auto engine is shorter for this reason meets the demands.Consider the needs of energy saving simultaneously, the chip oxygen sensor that a kind of integrated level is high, volume is little, consumed power is little, toggle speed is fast becomes a kind of trend, to enter the requirement of closed-loop control after meeting engine electric spray system cold start-up as far as possible fast, reduce the power consumption of lambda sensor simultaneously.
Current existing sheet type sensor structure is primarily of 3 layers of zirconia substrate and some function thick-film layers composition, and zirconia substrate is mainly through curtain coating or to roll the method for film shaping, and thick film functional layer obtains mainly through screen printing technique.The potential electrode of lambda sensor and contrast electrode are formed on the surfaces externally and internally of substrate respectively, the middle part of substrate are washed open one long and narrow openning, to form reference air duct by impact briquetting; And the platinum disposition of heating component of being wrapped up by ceramic insulating layer is on the inside surface of bottom substrate, also to make a call to two through holes at the end of substrate the heating electrode sheet of the heating element of inside surface with outside surface end is coupled together, constitute sensitive element and the integrated chip oxygen sensor structure of heating element.But this structural thickness is thick, volume is large, production process is complicated, and heating element is planted in sensor internal with parcel form, and stability is poor, and easily leaks electricity.
Gas sensor is a kind of converter certain gas volume fraction being changed into corresponding electric signal, current existing gas sensor is of a great variety, by gas sensitive used and gas-sensitive property difference thereof, semiconductor-type, solid electrolyte formula, electric chemical formula, catalytic combustion type etc. can be divided into.
1, semiconductor gas sensor
This sensor accounts for 60% in gas sensor.Resistance-type and non-resistor two kinds can be divided into according to its mechanism.Resistance-type adopts the preparation of the metal oxide materials such as SnO2, ZnO, have porous sintered, thick film, the form such as film.Mainly fixed by the situation of change of the electrical resistance gas content of detection gas sensor, main use metal oxide ceramic gas sensitive.Non-resistor semiconductor gas sensor utilizes the electric current of gas sensor and voltage change with gas content and work.
2, solid-state electrolyte gas sensor
This sensor element is the conduction of ion pair solid electrolyte diaphragm.Its mechanism is the electromotive force utilizing the potential difference (PD) between the battery of two, barrier film both sides to equal concentration cell.Measure gas concentrations is carried out, as the YST-Au-WO3 of H2S can be measured, measure the NH+4CaCO3 etc. of NH3 by measuring electromotive force.
3, catalytic combustion type gas sensor
This gas sensor can be divided into direct catalytic combustion type and catalytic Contact combustion-type two kinds.Its principle of work is: gas sensitive in the energized state, inflammable gas oxidizing fire or under catalyst action oxidizing fire, the heat produced makes the heating wire of sensor heat up, thus its resistance value is changed, and is changed the concentration carrying out measurement gas by measuring resistance.This sensor can only measure inflammable gas, and other are insensitive to non-combustible.
Although current existing gas sensor is of a great variety, principle is different, but the sensor of every type all can only be effective to specific gas, and the selectivity of sensor and the scope of application can not be taken into account, if namely selectivity is good, then detectable gaseous species is few, if detectable gaseous species is many, then selectivity is not high.
Be provide a kind of thin film chip gas sensor in the patented claim of 201410285080.X at number of patent application, comprise one piece of substrate, substrate there is a hearth electrode, substrate and hearth electrode have layer of semiconductor material thin-layer, thin layers of semiconductor material there is one deck unordered type metal film system, fastened point electrode at this unordered type metal film; Described hearth electrode and point electrode are drawn and external impressed current meter by wire; Described structure is placed in the blind boxes of a single radial cut.Also disclose a kind of thin film chip gas sensor preparation method, for the preparation of the sensor chip, prepare one block of backing material, first hearth electrode is plated on the surface of this backing material, plate thin layers of semiconductor material again, be coated with unordered type metal film system again, finally plate point electrode, total is placed in the box closed of a single radial cut; When being applied to detection gas, when gas is by blind boxes, in noble metal system as under the effect of catalyzer, catalyzed chemical reaction occurs, the interface that liberated heat excites the electronics in metal to cross metal and semiconductor forms electric current; Utilize galvanometer sensed current signal, utilize the size of sensed current signal and relatively change the detection realized gas and content thereof.Described substrate is optional the silicon chip of silicon dioxide oxide layer or glass sheet or sheet metal; When selecting substrate process, process substrate, disposal route is corrosion, ion implantation, original position etching and growth Seed Layer.The method of described growth Seed Layer is magnetron sputtering or molecular beam epitaxy or electrochemical deposition.The features such as the thin film chip gas sensor of this application has highly sensitive, and response is fast, and selectivity is good, and structure is simple, and the life-span is long, and can design for any gas, compensate for the shortcoming that traditional gas sensors can be taken into account.
Be provide a kind of integrated chip type oxygen sensor and preparation method thereof in the patented claim of 201010147931.6 at number of patent application, its preparation method comprises the following steps: the first step, by the same PVB of Zirconium oxide powder of 5% moles yttrium, terpinol and dibutyl phthalate (DBP) with 70 ~ 86: 6 ~ 12: 4 ~ 9: 4 ~ 9 quality be prepared into slurry than mixing and ball milling, then by double knife edges technology flow casting molding, zirconia green tape is made after natural drying, substrate base substrate is become again, i.e. upper strata zirconia substrate by mould punching; Then the electrode slurry containing 70% ~ 90% platinum powder and electrocondution slurry are printed on the surfaces externally and internally of upper strata zirconia substrate, form potential electrode and contrast electrode; The Electrode connection through hole that inner surface electrode is formed by upper strata zirconia substrate end punching press is connected with the interior electrode connecting piece (19) of outside surface; Second step, by dag, PVB, terpinol and softening agent with 30 ~ 46: 20 ~ 30: 16 ~ 24: 10 ~ 24 mass ratio mixing fully, formation can screen printing sizing agent, and covers on interior electrode surface by this slurry printing; This reference oxygen diffusion gap printed layers width will between upper strata zirconia substrate and contrast electrode width, and thickness will reach 15 to 50 microns, will form elongate slot after sintering; 3rd step, by the same PVB of Zirconium oxide powder of 5% moles yttrium, terpinol and dibutyl phthalate (DBP) with 70 ~ 86: 6 ~ 12: 4 ~ 9: 4 ~ 9 quality be prepared into slurry than mixing and ball milling, then by double knife edges technology flow casting molding, zirconia green tape is made after natural drying, substrate base substrate is become again, i.e. lower floor's zirconia substrate by mould punching; The slurry of the alumina powder reaching more than 97% containing purity is printed on the outside surface of lower floor's zirconia substrate, prepares alumina ceramic insulating layer; Then the electrocondution slurry containing platinum powder is printed on this alumina ceramic insulating layer, and one-step print forms platinum heating element and heating electrode sheet; 4th step, next, with the bonding agent containing zirconia powder, upper strata zirconia substrate and lower floor's zirconia base flaggy are stacked, be heated to 40 ~ 60 degree press closely simultaneously, again potential electrode end is immersed in the slurry containing magnesium aluminate spinel and lift, form the porous ceramics protective seam of parcel one; 5th step, merges parcel all-in-one-piece green compact 1300 ~ 1500 degree of high temperature sinterings 1 ~ 3 hour, prepares integrated chip type oxygen sensor.
Also there is following deficiency in prior art: Die strength does not reach required strength demand, and chip electrode contacts insufficient with measurement gas, impact sensing effect.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide that a kind of intensity meets the demands, chip electrode fully contacts with measurement gas, sense respond well sensor chip.
For realizing above-mentioned object, have employed following scheme: a kind of gas sensor chip, comprise overlay, piezoelectric substrate, electrode sensing plate, gas sensitive membrane and resistance heating electrodes, wherein, described electrode sensing plate is arranged between piezoelectric substrate, described piezoelectric substrate is arranged between overlay, described overlay and piezoelectric substrate composition electrodes conduct band, described electrode sensing plate and overlay form another electrodes conduct band, described resistance heating electrodes is arranged between two electrodes conduct bands, and described gas sensitive membrane is overlying on piezoelectric substrate.
Further, described overlay quantity is two.
Further, described gas sensitive membrane is the sensitive membrane to nitrogen or oxygen sensitive.
Further, described resistance heating electrodes respectively has a layer insulating up and down.
Further, described gas sensitive membrane is organic polymer or super molecular compound.
Beneficial effect of the present invention:
The structure adopting covering version and piezoelectric substrate to combine, adds Die strength; The features such as be provided with two section conductive strips, have highly sensitive, response is fast, and selectivity is good, and structure is simple, and the life-span is long, and can design for specific gas, have specific gas and measure effect accurately.
Accompanying drawing explanation
Fig. 1 is the structural representation of gas sensor chip of the present invention.
In figure, 1 is overlay, and 2 is piezoelectric substrate, and 3 is electrode sensing plate.
Embodiment
For making the object of the embodiment of the present invention and technical scheme clearly, the technical scheme below in conjunction with embodiment is clearly and completely described.Obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on described embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under without the need to the prerequisite of creative work, all belongs to the scope of protection of the invention.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Embodiment 1
A kind of gas sensor chip, comprise overlay 1, piezoelectric substrate 2, electrode sensing plate 3, to the gas sensitive membrane of nitrogen sensitivity and resistance heating electrodes, wherein, described electrode sensing plate 3 is arranged between piezoelectric substrate 2, described piezoelectric substrate 2 is arranged between overlay 1, described overlay 1 and piezoelectric substrate 2 form electrodes conduct band, described electrode sensing plate 3 and overlay 1 form another electrodes conduct band, described resistance heating electrodes is arranged between two electrodes conduct bands, and described gas sensitive membrane is overlying on piezoelectric substrate 2.Described resistance heating electrodes respectively have a layer insulating up and down.Wherein, gas sensitive membrane is organic polymer.
This gas sensor chip adopts following steps preparation:
(1) select polycarbonate as the overlay 1 of insulating material, the electrode sensing plate 3 surface being scribbled silver slurry is fixed in the middle of overlay 1 and piezoelectric substrate 2 by the technique of matrix printing, thus forms electrodes conduct band;
(2) select overlay 1 and the electrode sensing plate 3 of identical material, by above technique, form another electrodes conduct band;
(3) electric resistance heater is placed between two electrodes conduct systems, keeps identical 1cm interval, form circulation conductive strips;
(4) select the gas sensitive membrane containing zinc oxide gas sensitive to be overlying on piezoelectric substrate 2, complete parcel, make the coated whole circulation conductive strips of gas sensitive membrane;
(5) adopt platinum to make contact conductor to be connected with circulation conductive strips by the mode of welding.
Embodiment 2
A kind of gas sensor chip, comprise overlay 1, piezoelectric substrate 2, electrode sensing plate 3, to the gas sensitive membrane of oxygen sensitive and resistance heating electrodes, wherein, described electrode sensing plate 3 is arranged between piezoelectric substrate 2, described piezoelectric substrate 2 is arranged between overlay 1, described overlay 1 and piezoelectric substrate 2 form electrodes conduct band, described electrode sensing plate 3 and overlay 1 form another electrodes conduct band, described resistance heating electrodes is arranged between two electrodes conduct bands, and described gas sensitive membrane is overlying on piezoelectric substrate 2.Wherein, described gas sensitive membrane is super molecular compound.
This gas sensor chip adopts following steps preparation:
(1) select acrylic resin as the overlay 1 of insulating material, the electrode sensing plate 3 surface being scribbled silver-colored palladium slurry is fixed in the middle of overlay 1 and piezoelectric substrate 2 by the technique of matrix printing, thus forms electrodes conduct band;
(2) select overlay 1 and the electrode sensing plate 3 of identical material, by above technique, form another electrodes conduct band;
(3) electric resistance heater is placed between two electrodes conduct systems, keeps identical 2cm interval, form circulation conductive strips;
(4) select the gas sensitive membrane containing di-iron trioxide gas sensitive to be overlying on piezoelectric substrate 2, complete parcel, make the coated whole circulation conductive strips of gas sensitive membrane;
(5) adopt platinum alloy to make contact conductor to be connected with circulation conductive strips by the mode of welding.
These are only embodiments of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (5)
1. a gas sensor chip, it is characterized in that, comprise overlay, piezoelectric substrate, electrode sensing plate, gas sensitive membrane and resistance heating electrodes, wherein, described electrode sensing plate is arranged between piezoelectric substrate, described piezoelectric substrate is arranged between overlay, described overlay and piezoelectric substrate composition electrodes conduct band, described electrode sensing plate and overlay form another electrodes conduct band, described resistance heating electrodes is arranged between two electrodes conduct bands, and described gas sensitive membrane is overlying on piezoelectric substrate.
2. a kind of gas sensor chip according to claim 1, is characterized in that, described overlay quantity is two.
3. a kind of gas sensor chip according to claim 1, is characterized in that, described gas sensitive membrane is the sensitive membrane to nitrogen or oxygen sensitive.
4. a kind of gas sensor chip according to claim 1, is characterized in that, described resistance heating electrodes respectively have a layer insulating up and down.
5. a kind of gas sensor chip according to claim 4, is characterized in that, described gas sensitive membrane is organic polymer or super molecular compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410644774.8A CN104391007A (en) | 2014-11-14 | 2014-11-14 | Gas sensor chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410644774.8A CN104391007A (en) | 2014-11-14 | 2014-11-14 | Gas sensor chip |
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| CN104391007A true CN104391007A (en) | 2015-03-04 |
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| CN201410644774.8A Pending CN104391007A (en) | 2014-11-14 | 2014-11-14 | Gas sensor chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115413A (en) * | 2015-07-07 | 2015-12-02 | 中国矿业大学 | Modulus matching two-dimensional plane strain field test sensing element and manufacturing method thereof |
| CN115047044A (en) * | 2022-06-10 | 2022-09-13 | 湖北工业大学 | Electrolyte gas detection device and method of micro-fluidic gas sensor technology |
-
2014
- 2014-11-14 CN CN201410644774.8A patent/CN104391007A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115413A (en) * | 2015-07-07 | 2015-12-02 | 中国矿业大学 | Modulus matching two-dimensional plane strain field test sensing element and manufacturing method thereof |
| CN105115413B (en) * | 2015-07-07 | 2018-06-05 | 浙江工商大学 | A kind of matched two dimensional plane strain field test sensing element of modulus and preparation method thereof |
| CN115047044A (en) * | 2022-06-10 | 2022-09-13 | 湖北工业大学 | Electrolyte gas detection device and method of micro-fluidic gas sensor technology |
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Application publication date: 20150304 |
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