CN207957757U - A kind of MEMS combustible gas sensors - Google Patents
A kind of MEMS combustible gas sensors Download PDFInfo
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- CN207957757U CN207957757U CN201820362729.7U CN201820362729U CN207957757U CN 207957757 U CN207957757 U CN 207957757U CN 201820362729 U CN201820362729 U CN 201820362729U CN 207957757 U CN207957757 U CN 207957757U
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- metal catalyst
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- catalyst layer
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Abstract
The utility model provides a kind of MEMS combustible gas sensors, including silicon base, the lower surface of silicon base is equipped with 2 insulated tanks, upper surface is equipped with heat insulation layer, adiabatic layer surface is equipped with the first precious metal catalyst layer and the second precious metal catalyst layer symmetrical and for porous structure, first precious metal catalyst layer and the second precious metal catalyst layer are located at the surface of 2 insulated tanks, first precious metal catalyst layer surface is equipped with gas-insulated layer, second precious metal catalyst layer surface is provided with air hole, gas-insulated layer surface is equipped with one group of reference resistor, and it connects with the first precious metal catalyst layer and the second precious metal catalyst layer, gas-insulated layer edge is equipped with several lead windows.MEMS combustible gas sensors provided by the utility model are small, low in energy consumption, and performance is stablized, and processing method is simple, and production efficiency is high.
Description
Technical field
The utility model belongs to combustible gas sensor technical field, and in particular to a kind of MEMS combustible gas sensors.
Background technology
MEMS full name Micro Electromechanical System, MEMS refer to that size is at several millimeters
To smaller high-tech device, internal structure is generally an independent intelligence system in micron even nanometer scale.Be
Grow up on the basis of microelectric technique (semiconductor fabrication), has merged photoetching, burn into film, silicon micromachined, non-silicon
The high-tech electronic mechanical devices that the technologies such as micro Process and precision machinery processing make.
Combustible gas sensor is widely used in the fields such as coal mine, domestic gas alarm, industry monitoring, security protection.With hydrogen
Fuel cell car gradually moves towards the visual field of people, and combustible gas sensor also begins to enter vehicle electric field, for monitoring
The leak case of fuel-hydrogen of automobile, ensures the safety of driver.Catalytic type combustible gas sensor is to utilize infusibility gold
Belong to the resistance variations after platinum filament heating to measure combustable gas concentration.When fuel gas enters detector, draw on platinum filament surface
Oxidation reaction (flameless combustion) is played, the heat generated makes the temperature of platinum filament increase, and the resistance of platinum filament just changes, according to
The variation of resistance can calculate the concentration of gas.
Traditional catalytic combustion gas sensor bulk is big, high energy consumption, adds man-hour requirement hand-made, complex process is raw
It is low to produce efficiency, and artificial production has prodigious error, the performance for being easy to cause sensor unstable.
Utility model content
The purpose of this utility model is the deficiency for existing catalytic combustion gas sensor, provides a kind of small, work(
Consume it is low, performance stablize, processing method is simple, the high MEMS combustible gas sensors of production efficiency.
The utility model provides the following technical solution：
The lower surface of a kind of MEMS combustible gas sensors, including silicon base, the silicon base is equipped with 2 insulated tanks, on
Surface is equipped with heat insulation layer, and the thermal insulation layer surface is equipped with the first precious metal catalyst layer and second symmetrical and for porous structure
Precious metal catalyst layer, the first precious metal catalyst layer and the second precious metal catalyst layer are being located at 2 insulated tanks just
Top, the first precious metal catalyst layer surface are equipped with gas-insulated layer, and the second precious metal catalyst layer surface is provided with ventilative
Hole, the gas-insulated layer surface be equipped with one group of reference resistor, and with the first precious metal catalyst layer and described second your gold
Belong to Catalytic Layer series connection, the gas-insulated layer edge is equipped with several lead windows.
Preferably, it is anti-to be equipped with first for the lower surface of the first precious metal catalyst layer and the second precious metal catalyst layer
Oxide buffer layers, the first precious metal catalyst layer are equipped with the second anti-oxidant buffer layer with the gas-insulated interlayer.
Preferably, the described first anti-oxidant buffer layer and the second anti-oxidant buffer layer are titanium nitride, tantalum nitride, oxidation
One or several kinds in titanium, aluminium oxide, zirconium oxide, tungsten oxide, yttrium oxide and vanadium oxide.
Preferably, the temperature coefficient of the reference resistor is less than 50PPM/ DEG C.
Preferably, the resistance of the reference resistor is the first precious metal catalyst layer and the second precious metal catalyst layer
100-1000 times.
Preferably, the reference resistor is titanium nitride or tantalum nitride.
Preferably, the first precious metal catalyst layer and the second precious metal catalyst layer are platinum, palladium or platinum-nickel alloys, thickness
Degree is 400nm-3000nm.
A kind of processing method of MEMS combustible gas sensors, includes the following steps：
S1：Cleaning silicon base simultaneously dries up, heavy with Low Pressure Chemical Vapor Deposition and plasma enhanced chemical vapor respectively
Area method is sequentially depositing one layer of silicon nitride and layer of silicon dioxide in silicon substrate surface, obtains the heat insulation layer of 1-5 μ m-thicks；
S2：One group of symmetrical precious metal catalyst layer and graphical is deposited in adiabatic layer surface with magnetron sputtering method, by moving back
Fire processing obtains the first precious metal catalyst layer and the second precious metal catalyst layer of porous structure；
S3：In the surface deposited silicon nitride and silica of the first precious metal catalyst layer and the second precious metal catalyst layer, shape
At the gas-insulated layer of 600-4000nm thickness, air hole is etched above the second precious metal catalyst layer with counter ion etching method,
Go out several lead windows in the etching edge of gas-insulated layer；
S4：With the technique in S2 a pair of of reference resistor is deposited in gas-insulated layer surface；
S5：The technique being combined using wet method and dry method prepares insulated tank below silicon base.
Preferably, the upper and lower surface of the first precious metal catalyst layer and the second precious metal catalyst layer is splashed with magnetic control in the S2
It penetrates method and deposits anti-oxidant buffer layer, the first precious metal catalyst layer and the second precious metal catalyst layer can directly connect or pass through circuit
Series connection.
Preferably, the treatment temperature of magnetron sputtering method is 650-1100 DEG C in the S2, and processing time is 10 minutes -3 small
When.
The utility model has the beneficial effects that：
(1) the utility model uses the MEMS processing methods preparation of planarization, compared to traditional catalytic combustion gas
Sensor, MEMS combustible gas sensors provided by the utility model, volume greatly reduce, and power consumption is reduced to milliwatt by a watt grade
Not, therefore service life is long.
(2) MEMS combustible gas sensors provided by the utility model, precious metal catalyst layer is with the method system of magnetron sputtering
At compared to the heating coil that traditional filament-winding method makes, processing method is simple, and stability greatly promotes.
(3) processing method of MEMS combustible gas sensors provided by the utility model, easy to operate, production efficiency is high.
Description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality
Novel embodiment for explaining the utility model, does not constitute limitations of the present invention together.In the accompanying drawings：
Fig. 1 is the main structure diagram of the utility model；
Fig. 2 is the overlooking structure diagram of the utility model.
In figure label for：1, silicon base；2, insulated tank；3, heat insulation layer；4, the first anti-oxidant buffer layer；5, the first noble metal
Catalytic Layer；6, the second anti-oxidant buffer layer；7, gas-insulated layer；8, the second precious metal catalyst layer；9, lead window；10, it breathes freely
Hole；11, reference resistor.
Specific implementation mode
As depicted in figs. 1 and 2, a kind of MEMS combustible gas sensors, including silicon base 1, the lower surface of silicon base 1 are equipped with
2 insulated tanks 2, upper surface are equipped with heat insulation layer 3, and 3 surface of heat insulation layer is equipped with the first noble metal symmetrical and for porous structure
Catalytic Layer 5 and the second precious metal catalyst layer 8, the first precious metal catalyst layer 5 and the second precious metal catalyst layer 8 are located at 2 absolutely
The surface of heat channel 2,5 surface of the first precious metal catalyst layer are equipped with gas-insulated layer 7, and 8 surface of the second precious metal catalyst layer is provided with
Air hole 10,7 surface of gas-insulated layer be equipped with one group of reference resistor 11, and with the first precious metal catalyst layer 5 and the second noble metal
Catalytic Layer 8 is connected, and the temperature coefficient of reference resistor is less than 50PPM/ DEG C, and 7 edge of gas-insulated layer is equipped with several lead windows 9.
The lower surface of first precious metal catalyst layer 5 and the second precious metal catalyst layer 8 is equipped with the first anti-oxidant buffer layer 4,
The second anti-oxidant buffer layer 6 is equipped between first precious metal catalyst layer 5 and gas-insulated layer 7.
The operation principle of the utility model is：First precious metal catalyst layer 5, the second precious metal catalyst layer 8 and a pair of of reference
Resistance 11 constitutes Wheatstone bridge, when applying voltage at electric bridge both ends, the first precious metal catalyst layer 5 and the second precious metal catalyst
For layer 8 due to Joule heat temperature rise, the second precious metal catalyst layer 8 is catalyzed gas fuel burning, and the heat for generation of burning makes its temperature
Degree is higher than the first precious metal catalyst layer 5, leads to Wheatstone bridge disequilibrium and obtains voltage signal, the voltage value and combustible gas
The concentration of body is in a linear relationship, to obtain combustable gas concentration.
Embodiment 1
A kind of processing method of MEMS combustible gas sensors, includes the following steps：
S1：Cleaning silicon base simultaneously dries up, heavy with Low Pressure Chemical Vapor Deposition and plasma enhanced chemical vapor respectively
Area method is sequentially depositing one layer of silicon nitride and layer of silicon dioxide in silicon substrate surface, obtains the heat insulation layer of 1 μ m-thick；
S2：The first anti-oxidant buffer layer of one layer of titanium nitride material is deposited in adiabatic layer surface with magnetron sputtering method, then
The precious metal catalyst layer of one group of symmetrical alloy platinum material and graphical is deposited in the same way, and porous knot is obtained by annealing
Structure, thickness be 400nm the first precious metal catalyst layer and the second precious metal catalyst layer, treatment temperature be 650 DEG C, processing time
It is 3 hours, the second anti-oxidant buffer layer of one layer of tantalum-nitride material of subsequent redeposition；
S3：In the second anti-oxidant buffer-layer surface deposited silicon nitride and silica, the gas-insulated of 600nm thickness is formed
Layer, etches air hole above the second precious metal catalyst layer with counter ion etching method, goes out in the etching edge of gas-insulated layer
Several lead windows；
S4：The reference resistor of a pair of of titanium nitride material, resistance are deposited in gas-insulated layer surface with the technique in S2
It is 100 times of the first precious metal catalyst layer and the second precious metal catalyst layer；
S5：The technique being combined using wet method and dry method prepares insulated tank below silicon base, you can obtaining MEMS can
Combustion gas body sensor.
Embodiment 2
A kind of processing method of MEMS combustible gas sensors, includes the following steps：
S1：Cleaning silicon base simultaneously dries up, heavy with Low Pressure Chemical Vapor Deposition and plasma enhanced chemical vapor respectively
Area method is sequentially depositing one layer of silicon nitride and layer of silicon dioxide in silicon substrate surface, obtains the heat insulation layer of 5 μ m-thicks；
S2：The precious metal catalyst layer and figure of one group of symmetrical palladium material are deposited in adiabatic layer surface with magnetron sputtering method
Change, by making annealing treatment the first precious metal catalyst layer and the second precious metal catalyst that obtain porous structure, that thickness is 3000nm
Layer, treatment temperature are 1100 DEG C, and processing time is 10 minutes；
S3：In the surface deposited silicon nitride and silica of the first precious metal catalyst layer and the second precious metal catalyst layer, shape
At the gas-insulated layer of 4000nm thickness, air hole is etched above the second precious metal catalyst layer with counter ion etching method, in gas
The etching edge of body isolation layer goes out several lead windows；
S4：The reference resistor of a pair of of tantalum-nitride material, resistance are deposited in gas-insulated layer surface with the technique in S2
It is 1000 times of the first precious metal catalyst layer and the second precious metal catalyst layer；
S5：The technique being combined using wet method and dry method prepares insulated tank below silicon base, you can obtaining MEMS can
Combustion gas body sensor.
Embodiment 3
A kind of processing method of MEMS combustible gas sensors, includes the following steps：
S1：Cleaning silicon base simultaneously dries up, heavy with Low Pressure Chemical Vapor Deposition and plasma enhanced chemical vapor respectively
Area method is sequentially depositing one layer of silicon nitride and layer of silicon dioxide in silicon substrate surface, obtains the heat insulation layer of 3 μ m-thicks；
S2：Resisted the first of one layer of titanium oxide of adiabatic layer surface deposition, aluminium oxide and zirconia material with magnetron sputtering method
Then oxide buffer layers deposit the precious metal catalyst layer of one group of symmetrical platinum-nickel alloys material and graphical in the same way,
By making annealing treatment the first precious metal catalyst layer and the second precious metal catalyst layer that obtain porous structure, that thickness is 2000nm,
Treatment temperature is 900 DEG C, and processing time is 1.5 hours, then redeposition tungsten oxide layer, yttrium oxide and vanadium oxide material the
Secondary antibody oxide buffer layers；
S3：In the second anti-oxidant buffer-layer surface deposited silicon nitride and silica, the gas-insulated of 2500nm thickness is formed
Layer, etches air hole above the second precious metal catalyst layer with counter ion etching method, goes out in the etching edge of gas-insulated layer
Several lead windows；
S4：A pair of of reference resistor is deposited in gas-insulated layer surface with the technique in S2, resistance is the first noble metal
500 times of Catalytic Layer and the second precious metal catalyst layer；
S5：The technique being combined using wet method and dry method prepares insulated tank below silicon base, you can obtaining MEMS can
Combustion gas body sensor.
The MEMS combustible gas sensors that embodiment 1-3 is prepared, compared with conventional catalyst burning gases sensor, work(
Consumption reduces by 10 times, is reduced within 50Mw by 500Mw, and the response time was reduced to 3 seconds by 6 seconds, and measurement range promotes one times, by 0-
4% is promoted to 0-8%.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, although ginseng
The utility model is described in detail according to previous embodiment, it for those skilled in the art, still can be with
Technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features.It is all
Within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this practicality
Within novel protection domain.
Claims (7)
1. a kind of MEMS combustible gas sensors, which is characterized in that including silicon base, the lower surface of the silicon base is equipped with 2
Insulated tank, upper surface are equipped with heat insulation layer, and the thermal insulation layer surface is equipped with symmetrical and is urged for the first noble metal of porous structure
Change layer and the second precious metal catalyst layer, the first precious metal catalyst layer and the second precious metal catalyst layer are located at described in 2
The surface of insulated tank, the first precious metal catalyst layer surface are equipped with gas-insulated layer, the second precious metal catalyst layer table
Face is provided with air hole, and the gas-insulated layer surface is equipped with one group of reference resistor, and with the first precious metal catalyst layer and institute
The series connection of the second precious metal catalyst layer is stated, the gas-insulated layer edge is equipped with several lead windows.
2. a kind of MEMS combustible gas sensors according to claim 1, which is characterized in that first precious metal catalyst
The lower surface of layer and the second precious metal catalyst layer is equipped with the first anti-oxidant buffer layer, the first precious metal catalyst layer with
The gas-insulated interlayer is equipped with the second anti-oxidant buffer layer.
3. a kind of MEMS combustible gas sensors according to claim 2, which is characterized in that the first anti-oxidant buffering
Layer and the described second anti-oxidant buffer layer be titanium nitride, tantalum nitride, titanium oxide, aluminium oxide, zirconium oxide, tungsten oxide, yttrium oxide and
One or several kinds in vanadium oxide.
4. a kind of MEMS combustible gas sensors according to claim 1, which is characterized in that the temperature of the reference resistor
Coefficient is less than 50PPM/ DEG C.
5. a kind of MEMS combustible gas sensors according to claim 4, which is characterized in that the resistance of the reference resistor
Resistance value is 100-1000 times of the first precious metal catalyst layer and the second precious metal catalyst layer.
6. a kind of MEMS combustible gas sensors according to claim 5, which is characterized in that the reference resistor is nitridation
Titanium or tantalum nitride.
7. a kind of MEMS combustible gas sensors according to claim 1, which is characterized in that first precious metal catalyst
Layer and the second precious metal catalyst layer are platinum, palladium or platinum-nickel alloys, thickness 400nm-3000nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820362729.7U CN207957757U (en) | 2018-03-16 | 2018-03-16 | A kind of MEMS combustible gas sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820362729.7U CN207957757U (en) | 2018-03-16 | 2018-03-16 | A kind of MEMS combustible gas sensors |
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| Publication Number | Publication Date |
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| CN207957757U true CN207957757U (en) | 2018-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820362729.7U Withdrawn - After Issue CN207957757U (en) | 2018-03-16 | 2018-03-16 | A kind of MEMS combustible gas sensors |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275649A (en) * | 2018-03-16 | 2018-07-13 | 苏州钽氪电子科技有限公司 | A kind of MEMS combustible gas sensors and its processing method |
| CN112034005A (en) * | 2020-09-08 | 2020-12-04 | 苏州芯镁信电子科技有限公司 | Indirectly-heated silicon-based film catalytic hydrogen sensor and processing method thereof |
-
2018
- 2018-03-16 CN CN201820362729.7U patent/CN207957757U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275649A (en) * | 2018-03-16 | 2018-07-13 | 苏州钽氪电子科技有限公司 | A kind of MEMS combustible gas sensors and its processing method |
| CN112034005A (en) * | 2020-09-08 | 2020-12-04 | 苏州芯镁信电子科技有限公司 | Indirectly-heated silicon-based film catalytic hydrogen sensor and processing method thereof |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Suzhou City, Jiangsu Province, Suzhou Industrial Park 215000 Xinghu Street No. 218 BioBAY A7203 Patentee after: Suzhou xinmagnesium Electronic Technology Co.,Ltd. Address before: 215000 Suzhou Industrial Park, Suzhou City, Jiangsu Province, Room 903, 6 Business Travel Building, 381 East of Suzhou Avenue Patentee before: SUZHOU TAKR ELECTRONIC TECHNOLOGY Co.,Ltd. |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20230623 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20230623 |