WO2014194484A1 - 一种用于室温检测的no2气体传感器的制作方法 - Google Patents
一种用于室温检测的no2气体传感器的制作方法 Download PDFInfo
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- WO2014194484A1 WO2014194484A1 PCT/CN2013/076761 CN2013076761W WO2014194484A1 WO 2014194484 A1 WO2014194484 A1 WO 2014194484A1 CN 2013076761 W CN2013076761 W CN 2013076761W WO 2014194484 A1 WO2014194484 A1 WO 2014194484A1
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 105
- 239000002109 single walled nanotube Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 229920002120 photoresistant polymer Polymers 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 101100110023 Arabidopsis thaliana ASK8 gene Proteins 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002041 carbon nanotube Substances 0.000 claims description 8
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 8
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- 238000003618 dip coating Methods 0.000 claims description 7
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- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 238000007650 screen-printing Methods 0.000 claims description 5
- 238000004528 spin coating Methods 0.000 claims description 5
- 125000002524 organometallic group Chemical group 0.000 claims description 4
- 238000000206 photolithography Methods 0.000 claims description 4
- 238000001548 drop coating Methods 0.000 claims description 3
- 238000005566 electron beam evaporation Methods 0.000 claims description 3
- 238000007323 disproportionation reaction Methods 0.000 claims description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 18
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 abstract 4
- 238000009828 non-uniform distribution Methods 0.000 abstract 1
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 16
- OARDBPIZDHVTCK-UHFFFAOYSA-N 2-butyloctanoic acid Chemical compound CCCCCCC(C(O)=O)CCCC OARDBPIZDHVTCK-UHFFFAOYSA-N 0.000 description 4
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- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
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- -1 tin hexylhexanoate Chemical compound 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- 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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to the field of gas sensor technology, and more particularly to a method for fabricating a NO 2 gas sensor for room temperature detection.
- N0 2 is a typical atmospheric pollutant, mainly derived from the combustion of fossil fuels.
- the emission of automobile exhaust gas is one of the industrial pollutants causing acid rain, photochemical smog, etc. It is easy to act as a hydrocarbon in sunlight, causing respiratory diseases. It is a serious threat to human health and survival.
- the research of N0 2 gas sensor has been a hot topic at home and abroad. In order to improve the sensitive characteristics of sensors, people do in the selection and modification of materials. A lot of effort. With the rapid development of the Internet of Things, the design of portable, low-power sensors has received wide attention. Therefore, it is a very important task to prepare a flexible NO 2 sensor for room temperature detection.
- a conventional method of preparing a room temperature flexible NO 2 gas sensor is to directly deposit a layer of sensitive film on the surface of a flexible substrate.
- the substrate is first subjected to hydrophilic treatment, and then the sensitive material is deposited on the surface of the substrate by dip coating, drop coating or self-growth, so that the thickness of the sensitive film thus obtained is not uniform, and Poor adhesion to the substrate.
- the method solves the problem of poor adhesion and uneven distribution between the sensitive material and the flexible substrate, and achieves the purpose of firmly bonding and uniformly distributing the sensitive material and the flexible substrate.
- the present invention provides a method for fabricating a NO 2 gas sensor for room temperature detection, comprising: fabricating a metal electrode on a surface of a flexible substrate; fabricating a SWCNTs/Sn0 2 sensitive film; and sensitizing SWCNTs/Sn0 2 The film is bonded to the surface of the flexible substrate having the metal electrode to form a NO 2 gas sensor for room temperature detection.
- the fabricating the metal electrode on the surface of the flexible substrate comprises: cleaning the flexible substrate, applying a photoresist on the surface of the flexible substrate, and performing photolithography on the photoresist to engrave the surface of the flexible substrate For forming a photoresist at the metal electrode, forming an electrode pattern on the surface of the flexible substrate; then depositing a Cr film and an Au film sequentially on the flexible substrate having the electrode pattern by electron beam evaporation; finally stripping the photoresist and photolithography
- the Cr film and the Au film on the gel form a flexible substrate having a metal electrode on the surface.
- the flexible substrate comprises PI, PET or PEN.
- the photoresist coated on the surface of the flexible substrate is a positive glue, including 9920 or 3220.
- the preparing the SWCNTs/Sn0 2 sensitive film comprises: disproportionating reaction of CO under high pressure to form carbon nanotubes, mixing the carbon nanotubes with the organometallic solution stannous 2- hexylhexanoate, and ultrasonically oscillating 1.5 to 2.5 hours, a homogeneously mixed suspension is obtained; the suspension is then applied to the SiO 2 substrate by spin coating, dripping, dip coating or screen printing, and the solvent in the coating is evaporated and evaporated; The SK32 substrate of the solvent in the coating is subjected to high-temperature calcination to obtain a SWCNTs/Sn0 2 sensitive film combined with the SiO 2 substrate; finally, the SiO 2 acid is used to etch the SiO 2 substrate to realize the SWCNTs/Sn0 2 sensitive film and Si0 2 The substrate was separated to obtain a SWCNTs/Sn0 2 sensitive film.
- the SiO 2 substrate which evaporates the solvent in the coating layer is subjected to high-temperature calcination to obtain a reaction of the SWCNTs/Sn0 2 sensitive film combined with the SiO 2 substrate, and the reaction of stannous 2- hexylhexanoate by high-temperature calcination
- the equation is as follows: In the above solution, the high temperature calcination temperature ranges from 300 to 1000 °C.
- the SWCNTs/Sn0 2 sensitive film is combined with the surface of the flexible substrate having the metal electrode to form a NO 2 gas sensor for room temperature detection, including: coating a surface of the flexible substrate having the metal electrode Conductive silver paste, the SWCNTs/Sn0 2 sensitive film is combined with the surface of the flexible substrate having the metal electrode by the conductive silver paste to form a NO 2 gas sensor for room temperature detection.
- the method for fabricating the NO 2 gas sensor for room temperature detection combines the sensitive membrane material and the flexible substrate by an indirect method, thereby avoiding the high temperature operation of the flexible substrate in the preparation process of the sensitive membrane,
- the method firstly coated the SWCNTs/Sn0 2 sensitive film on the SiO 2 substrate, and then etched the SiO 2 substrate with HF acid to separate the SWCNTs/Sn0 2 sensitive film from the SK32 substrate; coating the electrode surface of the flexible substrate A layer of conductive silver paste is applied to bond the sensitive film to the flexible substrate.
- This method overcomes the problems of the conventional sensitive film prepared by dip coating, drop coating or self-growth, uneven distribution of sensitive materials, poor adhesion to the substrate, etc., and generates sensitivity by directly reacting on the surface of the substrate.
- the material and indirectly, combines the sensitive film material with the flexible substrate to make the sensitive material more uniformly distributed on the surface of the substrate, while also enhancing the adhesion between the sensitive material and the substrate.
- Figure 2-1 is a schematic view of a flexible substrate
- 2-2 is a schematic view showing the application of a photoresist on a flexible substrate and photolithography forming a pattern on the flexible substrate;
- Figure 2-3 is a schematic view after depositing a Cr film and an Au film on a flexible substrate having an electrode pattern
- 2-4 are schematic views showing a release resist and a Cr film and an Au film thereon to obtain a flexible substrate having a metal electrode;
- 2-6 are schematic views showing formation of a sensitive film on a SiO 2 substrate
- Figure 2-7 Schematic diagram of the SWCNTs/Sn0 2 sensitive film remaining after the HF acid etches off the underlying SiO 2 substrate;
- 2-8 is a schematic view showing a layer of conductive silver paste coated on a surface of a flexible substrate having a metal electrode
- FIGS. 2-9 are schematic views of bonding a SWCNTs/Sn0 2 sensitive film to a surface of a flexible substrate having a metal electrode using a conductive silver paste.
- CO disproportionation reaction generates carbon nanotubes under high pressure
- carbon nanotubes and organometallic solution stannous 2-hexylhexanoate are mixed, ultrasonically oscillated for 1.5 to 2.5 hours, preferably ultrasonic vibration 2
- ultrasonically oscillated for 1.5 to 2.5 hours, preferably ultrasonic vibration 2
- a uniformly mixed suspension is obtained, and then the suspension is coated on a SiO 2 substrate by spin coating, dripping, dip coating or screen printing, and the solvent in the coating is dried and evaporated, and then calcined at a high temperature of 0.5.
- FIG. 1 is a flow chart of a method for fabricating a NO 2 gas sensor for room temperature detection provided by the present invention, the method comprising the following steps:
- Step 1 forming a metal electrode on the surface of the flexible substrate
- the flexible substrate is first cleaned.
- the flexible substrate includes at least PI, PET or PEN, etc., and has the advantages of being lightweight, inexpensive, flexible, and flexible, and can expand the application scenario of the sensor.
- a photoresist is coated on the flexible substrate, and the photoresist used here is a positive glue, including positive glues such as 9920 and 3220, and the photoresist is photolithographically processed.
- the photoresist on the flexible substrate for forming the metal electrode is engraved, and the electrode pattern is formed on the flexible substrate; then, as shown in FIG. 2-3, a flexible lining having an electrode pattern is employed by electron beam evaporation or other coating technique.
- a Cr film and an Au film are sequentially deposited on the bottom; finally, as shown in FIGS. 2-4, the photoresist and the Cr film and the Au film thereon are peeled off to obtain a flexible substrate having a metal electrode.
- coating technologies include magnetron sputtering, CVD, spin coating, screen printing and the like, which are designed to deposit a uniform film on the surface of the substrate.
- Step 2 Making SWCNTs/Sn0 2 sensitive film
- CO is disproportionated under high pressure to form carbon nanotubes
- the carbon nanotubes are mixed with the organometallic solution stannous 2-hexylhexanoate, ultrasonically shaken for 1.5 to 2.5 hours, preferably ultrasonically shaken for 2 hours.
- a uniformly mixed suspension is obtained (this process is only mixing, no chemical reaction occurs); then the suspension is applied to the SK32 substrate by spin coating, dripping, dip coating or screen printing, and the SK32 substrate is as shown in the figure.
- the SK32 substrate which evaporates the solvent in the coating is calcined at a high temperature to obtain a SWCNTs/Sn0 2 sensitive film combined with the SK32 substrate, and the reaction of preparing the Sn0 2 by calcination of the tin hexylhexanoate at a high temperature is as follows :
- Step 3 combining the SWCNTs/Sn0 2 sensitive film with the surface of the flexible substrate having the metal electrode to form a NO 2 gas sensor for room temperature detection;
- a conductive silver paste is coated on the surface of the flexible substrate having the metal electrode, as shown in FIG. 2-9, and the conductive silver paste is used to sensitize SWCNTs/Sn0 2 .
- the film is combined with the surface of the flexible substrate having the metal electrode to obtain a NO 2 gas sensor for room temperature detection, and the NO 2 gas sensor can have a good detection sensitivity to N0 2 at room temperature.
- the method for fabricating the NO 2 gas sensor for room temperature detection combines the sensitive film material and the flexible substrate by an indirect method, thereby avoiding the flexible substrate in the sensitive film.
- the high-temperature operation in the preparation process overcomes the problems of the conventional sensitive film prepared by dip coating, dripping or self-growth, uneven distribution of sensitive materials, poor adhesion to the substrate, etc., by directly on the substrate.
- the surface reaction generates a sensitive material, and the sensitive film material and the flexible substrate are combined in an indirect manner, so that the sensitive material is more uniformly distributed on the surface of the substrate, and the adhesion between the sensitive material and the substrate is also enhanced.
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Abstract
一种用于室温检测的NO2气体传感器的制作方法，包括：在柔性衬底表面制作金属电极；制作SWCNTs/SnO2敏感膜；以及将SWCNTs/SnO2敏感膜与柔性衬底具有金属电极的表面结合，形成用于室温检测的NO2气体传感器。解决了敏感材料与柔性衬底之间粘附性差，分布不均匀的问题，达到了使敏感材料与柔性衬底之间牢固结合，均匀分布的目的。
Description
一种用于室温检测的 N02气体传感器的制作方法
技术领域 本发明属于气体传感器技术领域， 特别是一种用于室温检测的 N02 气体传感器的方制作法。
背景技术 随着科学的发展，传感器的应用日渐广阔，制造出一种轻便，廉价， 可大面积制造的传感器势在必行。 基于柔性衬底的气体传感器由于其柔 韧性等种种优点而使很多问题得到根本性的改善， 从而使其具有更加广 阔的应用前景。
N02属于典型的大气污染物， 主要来源于矿物燃料的燃烧， 汽车尾 气的排放， 是引起酸雨、 光化学烟雾等问题的工业污染物之一， 在阳光 下易于碳氢化合物作用， 引起呼吸道疾病， 严重威胁着人类的健康与生 存。 随着工业的高速发展， 对 N02的监测越来越受到人们的关注， N02 气体传感器的研究一直是国内外的热点， 为提高传感器的敏感特性， 人 们在材料的选择和改性方面做了很多努力。 随着物联网的快速发展， 设 计便携式、 低功耗的传感器受到广泛关注。 因此， 制备一种常温检测的 柔性 N02传感器成为一项非常重要的任务。
传统的制备室温柔性 N02气体传感器的方法是在柔性衬底的表面 直接淀积一层敏感膜。 传感器在制备过程中首先要对衬底进行亲水性处 理，然后将敏感材料通过浸涂，滴涂或者自生长的方法淀积在衬底表面， 这样制得的敏感膜的厚度不均匀， 而且与衬底之间的粘附性差。
发明内容
(一） 要解决的技术问题
本发明的目的是提供一种制作用于室温检测的 N02气体传感器的
方法， 以解决敏感材料与柔性衬底之间粘附性差， 分布不均匀的问题， 达到使敏感材料与柔性衬底之间牢固结合， 均匀分布的目的。
(二） 技术方案
为达到上述目的，本发明提供了一种用于室温检测的 N02气体传感 器的制作方法，包括:在柔性衬底表面制作金属电极;制作 SWCNTs/Sn02 敏感膜； 以及将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电极的表面 结合， 形成用于室温检测的 N02气体传感器。
上述方案中， 所述在柔性衬底表面制作金属电极， 包括： 清洗柔性 衬底， 在该柔性衬底表面涂敷光刻胶， 并对该光刻胶进行光刻， 刻掉柔 性衬底表面用于形成金属电极处的光刻胶， 在柔性衬底表面形成电极图 形； 接着采用电子束蒸发在具有电极图形的柔性衬底上依次沉积 Cr膜 和 Au膜； 最后剥离光刻胶及光刻胶上的 Cr膜和 Au膜， 形成表面具有 金属电极的柔性衬底。
上述方案中， 所述柔性衬底包括 PI、 PET或 PEN。所述在柔性衬底 表面涂敷的光刻胶为正胶， 包括 9920或 3220。
上述方案中， 所述制作 SWCNTs/Sn02敏感膜， 包括： 将 CO在高 压作用下发生歧化反应生成碳纳米管， 将该碳纳米管与有机金属溶液 2- 己基己酸亚锡混合，超声振荡 1.5至 2.5小时，得到均匀混合的悬浮液； 接着通过旋涂、 滴涂、 浸涂或丝网印刷将该悬浮液涂覆在 Si02基片上， 干燥蒸发掉涂层中的溶剂；然后对蒸发掉涂层中溶剂的 SK32基片进行高 温煅烧， 得到与 Si02基片结合的 SWCNTs/Sn02敏感膜； 最后利用 HF 酸刻蚀掉 Si02基片， 实现将 SWCNTs/Sn02敏感膜与 Si02基片分离， 得 到 SWCNTs/Sn02敏感膜。 所述对蒸发掉涂层中溶剂的 Si02基片进行高 温煅烧， 得到与 Si02基片结合的 SWCNTs/Sn02敏感膜的歩骤中， 2-己 基己酸亚锡被高温煅烧发生的反应方程式如下：
上述方案中， 所述高温煅烧的温度范围为 300-1000°C。
上述方案中， 所述将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电 极的表面结合， 形成用于室温检测的 N02气体传感器， 包括： 在柔性衬 底具有金属电极的表面涂覆一层导电银浆， 利用该导电银浆将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电极的表面结合起来，形成用 于室温检测的 N02气体传感器。
(三） 有益效果
本发明提供的这种用于室温检测的 N02气体传感器的制作方法，通 过间接的方法将敏感膜材料和柔性衬底结合起来， 避免了柔性衬底在敏 感膜制备过程中的高温操作， 该方法先将 SWCNTs/Sn02敏感膜涂覆在 Si02基片上， 然后利用 HF酸刻蚀掉 Si02基片， 将 SWCNTs/Sn02敏感 膜与 SK32基片分离； 在柔性衬底的电极表面涂覆一层导电银浆， 将敏感 膜与柔性衬底结合起来。 这种方法克服了传统的通过浸涂、 滴涂或者自 生长的方法制备的敏感膜， 敏感材料分布不均匀、 与衬底之间的粘附性 差等问题， 通过直接在衬底表面反应生成敏感材料， 并用间接的方法将 敏感膜材料和柔性衬底结合起来， 使得敏感材料在衬底表面分布更均匀， 同时也增强了敏感材料与衬底之间的粘附性。
附图说明 为了更进一歩说明本发明的内容， 以下结合附图及实施例子， 对本 发明做详细描述， 其中：
图 1是本发明提供的制作用于室温检测的 N02气体传感器的方法流
程图；
图 2-1是柔性衬底的示意图；
图 2-2是在柔性衬底上涂敷光刻胶并光刻在柔性衬底上形成电极图 形的示意图；
图 2-3是在具有电极图形的柔性衬底上沉积 Cr膜和 Au膜后的示意 图；
图 2-4是剥离光刻胶及其上的 Cr膜和 Au膜得到具有金属电极的柔 性衬底的示意图；
图 2-5是 Si02基片的示意图；
图 2-6是在 Si02基片上形成敏感膜的示意图；
图 2-7 HF酸刻蚀掉下层的 Si02基片后剩下的 SWCNTs/Sn02敏感膜 示意图；
图 2-8是在柔性衬底具有金属电极的表面涂覆一层导电银浆的示意 图；
图 2-9是利用导电银浆将 SWCNTs/Sn02敏感膜与柔性衬底具有金 属电极的表面结合的示意图。
具体实施方式 为使本发明的目的、 技术方案和优点更加清楚明白， 以下结合具体 实施例， 并参照附图， 对本发明进一歩详细说明。
本发明采用的技术思路如下： CO在高压作用下发生歧化反应生成 碳纳米管， 将碳纳米管和有机金属溶液 2-己基己酸亚锡混合， 超声振荡 1.5至 2.5小时， 优选地超声振荡 2小时， 得到均匀混合的悬浮液， 然后 通过旋涂、滴涂、浸涂或丝网印刷等方式将此悬浮液涂覆在 Si02基片上， 干燥蒸发掉涂层中的溶剂， 然后高温煅烧 0.5小时至 4小时， 得到复合 SWCNTs/Sn02敏感膜， 并利用 HF酸刻蚀掉下层的 Si02， 将敏感膜与衬 底分离； 在柔性衬底的电极表面涂覆一层导电银浆， 将敏感膜与柔性衬 底结合起来， 从而制得室温检测的柔性 N02气体传感器。
如图 1所示， 图 1是本发明提供的制作用于室温检测的 N02气体传 感器的方法流程图， 该方法包括以下歩骤：
歩骤 1 : 在柔性衬底表面制作金属电极；
在本歩骤中， 首先清洗柔性衬底， 如图 2-1所示， 该柔性衬底至少 包括 PI、 PET或 PEN等， 具有轻便、 廉价及柔韧易弯曲等优点， 能够 扩展传感器的应用场景； 然后如图 2-2所示， 在该柔性衬底上涂敷光刻 胶， 此处采用的光刻胶为正胶， 包括 9920、 3220 等正胶， 对该光刻胶 进行光刻， 刻掉柔性衬底上用于形成金属电极处的光刻胶， 在柔性衬底 上形成电极图形； 接着如图 2-3所示， 采用电子束蒸发或其他镀膜技术 在具有电极图形的柔性衬底上依次沉积 Cr膜和 Au膜； 最后如图 2-4所 示，剥离光刻胶及其上的 Cr膜和 Au膜，得到具有金属电极的柔性衬底。 其中其他镀膜技术是磁控溅射、 CVD、 旋涂、 丝网印刷等镀膜技术， 其 目的在于在衬底表面淀积一层均匀的膜。
歩骤 2: 制作 SWCNTs/Sn02敏感膜；
在本歩骤中， CO 在高压作用下发生歧化反应生成碳纳米管， 将碳 纳米管与有机金属溶液 2-己基己酸亚锡混合，超声振荡 1.5至 2.5小时， 优选地超声振荡 2小时， 得到均匀混合的悬浮液 （此过程只是混合， 不 发生化学反应）； 然后通过旋涂、 滴涂、 浸涂或丝网印刷等方式将此悬 浮液涂覆在 SK32基片上， SK32基片如图 2-5所示， 干燥蒸发掉涂层中的 溶剂;然后将蒸发掉涂层中溶剂的 SK32基片高温煅烧 0.5小时至 4小时， 高温煅烧的温度范围为 300 °C -1000 °C， 得到与 Si02基片结合的 SWCNTs/Sn02敏感膜， 如图 2-6所示， 利用 HF酸刻蚀掉下层的 Si02 基片， 将 SWCNTs/Sn02敏感膜与 Si02基片分离， 得到 SWCNTs/Sn02 敏感膜， 如图 2-7所示。
其中， 将蒸发掉涂层中溶剂的 SK32基片高温煅烧， 得到与 SK32基 片结合的 SWCNTs/Sn02敏感膜的过程中， 2-己基己酸亚锡被高温煅烧来 制备 Sn02的反应如下：
歩骤 3:将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电极的表面结 合， 形成用于室温检测的 N02气体传感器；
在本歩骤中， 如图 2-8所示， 在柔性衬底具有金属电极的表面涂覆 一层导电银浆，如图 2-9所示，利用该导电银浆将 SWCNTs/Sn02敏感膜 与柔性衬底具有金属电极的表面结合起来，得到用于室温检测的 N02气 体传感器，该 N02气体传感器在室温下能够对 N02有较好的检测灵敏度。
从上述实施例可以看出，本发明提供的这种用于室温检测的 N02气 体传感器的制作方法， 通过间接的方法将敏感膜材料和柔性衬底结合起 来， 避免了柔性衬底在敏感膜制备过程中的高温操作， 克服了传统的通 过浸涂、 滴涂或者自生长的方法制备的敏感膜， 敏感材料分布不均匀、 与衬底之间的粘附性差等问题， 通过直接在衬底表面反应生成敏感材料， 并用间接的方法将敏感膜材料和柔性衬底结合起来， 使得敏感材料在衬 底表面分布更均匀， 同时也增强了敏感材料与衬底之间的粘附性。
以上所述的具体实施例， 对本发明的目的、 技术方案和有益效果进 行了进一歩详细说明， 所应理解的是， 以上所述仅为本发明的具体实施 例而已， 并不用于限制本发明， 凡在本发明的精神和原则之内， 所做的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。
Claims
1、一种用于室温检测的 N02气体传感器的制作方法，其特征在于， 包括：
在柔性衬底表面制作金属电极；
制作 SWCNTs/Sn02敏感膜； 以及
将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电极的表面结合， 形 成用于室温检测的 N02气体传感器。
2、 根据权利要求 1所述的用于室温检测的 N02气体传感器的制作 方法， 其特征在于， 所述在柔性衬底表面制作金属电极， 包括：
清洗柔性衬底， 在该柔性衬底表面涂敷光刻胶， 并对该光刻胶进行 光刻， 刻掉柔性衬底表面用于形成金属电极处的光刻胶， 在柔性衬底表 面形成电极图形； 接着采用电子束蒸发在具有电极图形的柔性衬底上依 次沉积 Cr膜和 Au膜；最后剥离光刻胶及光刻胶上的 Cr膜和 Au膜，形 成表面具有金属电极的柔性衬底。
3、 根据权利要求 2所述的用于室温检测的 N02气体传感器的制作 方法， 其特征在于， 所述柔性衬底包括 PI、 PET或 PEN。
4、 根据权利要求 2所述的用于室温检测的 N02气体传感器的制作 方法，其特征在于，所述在柔性衬底表面涂敷的光刻胶为正胶，包括 9920 或 3220。
5、 根据权利要求 1所述的用于室温检测的 N02气体传感器的制作 方法， 其特征在于， 所述制作 SWCNTs/Sn02敏感膜， 包括：
将 CO在高压作用下发生歧化反应生成碳纳米管， 将该碳纳米管与 有机金属溶液 2-己基己酸亚锡混合， 超声振荡 1.5至 2.5小时， 得到均 匀混合的悬浮液； 接着通过旋涂、 滴涂、 浸涂或丝网印刷将该悬浮液涂 覆在 SK32基片上， 干燥蒸发掉涂层中的溶剂； 然后对蒸发掉涂层中溶剂 的 Si02基片进行高温煅烧，得到与 Si02基片结合的 SWCNTs/Sn02敏感 膜； 最后利用 HF酸刻蚀掉 Si02基片， 实现将 SWCNTs/Sn02敏感膜与 Si02基片分离， 得到 SWCNTs/Sn02敏感膜。
6、 根据权利要求 5所述的用于室温检测的 N02气体传感器的制作 方法，其特征在于，所述对蒸发掉涂层中溶剂的 SK32基片进行高温煅烧， 得到与 Si02基片结合的 SWCNTs/Sn02敏感膜的歩骤中， 2-己基己酸亚 锡被高温煅烧发生的反应方程式如下：
7、 根据权利要求 5或 6所述的用于室温检测的 N02气体传感器的 制作方法， 其特征在于， 所述高温煅烧的温度范围为 300-1000°C。
8、 根据权利要求 1所述的用于室温检测的 N02气体传感器的制作 方法， 其特征在于， 所述将 SWCNTs/Sn02敏感膜与柔性衬底具有金属 电极的表面结合， 形成用于室温检测的 N02气体传感器， 包括：
在柔性衬底具有金属电极的表面涂覆一层导电银浆， 利用该导电银 浆将 SWCNTs/Sn02敏感膜与柔性衬底具有金属电极的表面结合起来， 形成用于室温检测的 N02气体传感器。
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