WO2005003752A1 - 弾性表面波センサー - Google Patents
弾性表面波センサー Download PDFInfo
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- WO2005003752A1 WO2005003752A1 PCT/JP2004/005077 JP2004005077W WO2005003752A1 WO 2005003752 A1 WO2005003752 A1 WO 2005003752A1 JP 2004005077 W JP2004005077 W JP 2004005077W WO 2005003752 A1 WO2005003752 A1 WO 2005003752A1
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- Prior art keywords
- surface acoustic
- acoustic wave
- electrode
- wave sensor
- substance
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2462—Probes with waveguides, e.g. SAW devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2468—Probes with delay lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/014—Resonance or resonant frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0255—(Bio)chemical reactions, e.g. on biosensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0256—Adsorption, desorption, surface mass change, e.g. on biosensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
Definitions
- the present invention relates to a surface acoustic wave sensor used for, for example, a biosensor or a gas sensor, and more specifically, uses an SH type surface wave.
- the present invention relates to a surface acoustic wave sensor that detects an object to be detected based on a frequency change due to an added mass load.
- a surface acoustic wave sensor that detects a biological substance such as DNA or an antibody
- a reaction film that reacts only with a specific biological substance such as a specific DNA or antibody is provided on the surface acoustic wave element.
- the DNA or the antibody reacts with the reaction membrane and is bound to the reaction membrane, thereby imposing a mass on the surface acoustic wave element.
- the presence or absence and concentration of DNA and antibodies are detected by the frequency change caused by this mass load.
- Japanese Patent Application Laid-Open No. 10-290270 discloses an example of this type of surface acoustic wave sensor.
- the surface acoustic wave sensor described in this prior art is capable of detecting 2-MIB (2-methyl isoborneol), a moldy odor substance contained in water.
- FIG. 12 in the surface acoustic wave sensor 101, interdigital electrodes 103 and 104 and a metal thin film 105 are formed on a piezoelectric substrate 102.
- Amplifiers 106 and 107 are connected between the one interdigital electrode 103 and the other interdigital electrode 104, and the output interdigital A mixer 108 is connected downstream of the metal electrode 104 and the amplifiers 106 and 107.
- the output of the surface acoustic wave sensor 101 is extracted from the mixer 108.
- the camphor-OVa complex is immobilized on the upper surface of the piezoelectric substrate 102.
- This camphor-Ova complex functions as a reaction membrane, and 2-MIB is detected by reaction with the camphor-Ova complex.
- a complex antigen of a transfer and a protein having a structure similar to 2-MIB which is a mold odor causing substance is immobilized on the surface acoustic wave sensor 101.
- the surface acoustic wave sensor 101 is immersed in a solution to be measured containing a constant concentration of an anti-2-MIB antibody that specifically binds 2-MlB, and the unknown concentration existing in the solution. 2—MIB reacts competitively with the camphor-protein complex antigen.
- the amount of the anti-2-MIB antibody bound to the camphor-protein complex antigen immobilized on the surface acoustic wave sensor 101 is determined by the output change due to the mass load on the surface acoustic wave sensor.
- the difference between the amount of anti-2-MIB antibody bound to the camphor 'protein complex antigen and the amount of bound antibody in the absence of 2-MIB determines the concentration of 2-MIB in the solution to be measured.
- surface acoustic wave sensors have been widely used for detecting or quantifying biological substances such as DNA, antigens and antibodies, and various substances such as 2-MIB which cause mold odor.
- a reaction film corresponding to the substance to be detected is formed on the piezoelectric substrate, and the detection or quantification of the substance to be detected is performed by a frequency change due to a mass load on the reaction film. I have.
- the surface acoustic wave sensor detects a change in mass as a change in frequency. Therefore, the greater the frequency change, the higher the sensitivity of the surface acoustic wave sensor It is. Therefore, in order to enhance the sensitivity, various researches on the configuration of the reaction film according to the substance to be detected have been conducted as described above.
- An object of the present invention is to provide a surface acoustic wave sensor in which a reaction film is formed on a surface acoustic wave element and a substance to be detected is detected by a change in a mass load on the surface acoustic wave element in view of the above-mentioned state of the art.
- An object of the present invention is to provide a surface acoustic wave sensor in which the sensitivity is effectively increased by improving the structure of the surface acoustic wave element itself.
- the present invention relates to a surface acoustic wave sensor for detecting a minute mass load on a surface acoustic wave element by a change in frequency.
- the sensor uses a SH type surface acoustic wave and has an Euler angle of (0 °, 0 °).
- the aforementioned i T is formed on a Os on a substrate, the surface wave exciting electrodes mainly composed of Au, to cover the surface wave exciting electrode is formed on the L i T a 0 3 substrate, And a reaction film that binds the detection target substance or a binding substance that binds to the detection target substance, and the film thickness of the electrode standardized by the wavelength of the surface acoustic wave is in the range of 0.8 to 9.5%. It is characterized by the following.
- the Euler angle is preferably (0 °, 120 ° to 140 °, 0 ° ⁇ 5 °).
- the surface acoustic wave sensor further includes an adhesion layer formed between the reaction film and the electrode, for enhancing adhesion between the reaction film and the electrode.
- a protective film is formed between the reaction film and the electrode, and is provided so as to reach a region outside the electrode from above the electrode. Is further provided.
- a protective film is formed between the adhesion layer and the electrode, and is provided so as to reach a region outside the electrode from above the electrode. Is further provided.
- the film thickness of the electrode standardized by the wavelength of the surface acoustic wave is in the range of 1.2 to 8.5%.
- the film thickness of the electrode normalized by the wavelength of the surface acoustic wave is in the range of 1.9 to 6.6%.
- a film thickness of the electrode standardized by a wavelength of the surface acoustic wave is in a range of 3.0 to 5.0%.
- the biosensor according to the present invention is configured using the surface acoustic wave sensor configured according to the present invention, and the reaction film has a substance that binds to a biological substance as a detection target substance, and the biological substance is a reactive membrane.
- the mass applied to the substrate surface of the surface acoustic wave sensor changes.
- FIGS. 1A to 1D are diagrams for explaining the measurement principle of the surface acoustic wave sensor according to the present invention
- FIG. 1A shows a state in which a substance to be detected does not exist in a liquid.
- (B) is a diagram showing a frequency change when the target substance is not present in the liquid
- (c) is a target cross-sectional view in the liquid.
- FIG. 3D is a schematic front sectional view when a substance is present
- FIG. 4D is a diagram for explaining a frequency change when a detection target substance is present in the liquid.
- FIG. 2 is a plan view schematically showing an electrode structure of the two-port type surface acoustic wave resonator prepared in Experimental Example 1.
- FIG. 2 is a plan view schematically showing an electrode structure of the two-port type surface acoustic wave resonator prepared in Experimental Example 1.
- FIG. 3 is a diagram showing a frequency characteristic of an initial impedance of a Rayleigh wave and an SH wave and a frequency characteristic of an impedance after damping in a liquid.
- FIG. 4 is a diagram showing the change over time of the frequency change due to the mass load on the surface acoustic wave element when the normalized film thickness of the interdigital electrode is changed in the experimental example.
- FIG. 5 is a diagram showing the variation of the frequency variation when the normalized film thickness of the interdigital electrode is varied and a mass load of 10 ng / mm2 is applied in Experimental Example 3.
- Figure 6 is a diagram showing a relationship between L i T a 0 3 electrodes Tadashi KakukamakuAtsu and the frequency change amount when the Euler angle of the substrate was changed variously.
- FIG. 8 is a diagram showing an example of an insertion loss-frequency characteristic of the surface acoustic wave sensor according to one embodiment of the present invention having a two-port type surface acoustic wave resonator structure.
- FIGS. 9 (a) and (b) show modified examples of the surface acoustic wave sensor of the present invention, and are schematic front sectional views of the surface acoustic wave sensor provided with a protective film.
- FIG. 10 is a schematic plan view showing an electrode structure of a one-port type surface acoustic wave resonator as an example of an electrode structure used in the surface acoustic wave sensor of the present invention.
- FIG. 11 shows another example of the electrode structure used in the surface acoustic wave sensor of the present invention.
- FIG. 3 is a schematic plan view showing an electrode structure of a transversal surface acoustic wave filter as an example.
- FIG. 12 is a schematic plan view for explaining an example of a conventional surface acoustic wave sensor. BEST MODE FOR CARRYING OUT THE INVENTION
- 1 (a) to 1 (d) are diagrams for explaining a measurement principle of an ionic surface acoustic wave sensor according to an embodiment of the present invention.
- the surface acoustic wave sensor 1 of the present embodiment uses an SH type surface wave and has an Euler angle of (0 °, 0 ° to 18 °, 0 ° ⁇ 5 °) or (0 °, 58 °). to 1 8 0 °, it has a rotated Y-cut L i T a 0 3 substrate 2 is 0 ° + 5 °).
- the L i T a 0 3 I centers digital electrode 3 as a surface wave exciting electrode on the substrate 2 is formed.
- the interdigital electrode 3 is composed of Au. Further, the film thickness of the interdigital electrode 3 normalized by the wavelength of the surface acoustic wave is in the range of 0.8 to 9.5%.
- the L i T a 0 3 reaction layer 4 on the substrate is formed.
- the reaction membrane 4 can be made of an appropriate material that binds a substance to be detected or a binding substance that binds to the substance to be detected.
- the liquid 5 comes into contact with the reaction film 4 as shown in FIG. 1 (a).
- the detection-target substance in the liquid 5 is not present, the liquid 5 comes in contact with the reaction film 4, the mass is a load on the turn L i T a 0 3 surface interdigital electrodes 3 of the substrate 2 is formed Will be. Therefore, as shown in Fig. 1 (b), from the frequency characteristic A before immersion in liquid 5, The frequency decreases so as to obtain the frequency characteristic B after the operation. However, in this case, the amount of change in this frequency is relatively small.
- the detection target substance 6 When the detection target substance 6 is present in the liquid 5, the detection target substance 6 reacts with the reaction film 4 and is bonded to the surface of the reaction film 4. Therefore, the mass loading effect of the detection target substance 6, L i T a 0 3 influence on an SH-type surface acoustic wave which is excited on the surface of the substrate 2 is increased, the detection target by the frequency changes as above The presence or absence of a substance can be detected.
- the surface acoustic wave characteristics of the sensor 1 of the present embodiment utilizes the SH type surface acoustic wave, that was used rotation Y cut L i T A_ ⁇ 3 substrate of the specific Euler angles, I
- the interdigital electrode 3 was formed of Au, and the thickness of the interdigital electrode 3 standardized by the surface acoustic wave wavelength was in the range of 0.8 to 9.5%.
- FIG. 3 shows the impedance-frequency characteristics and the phase-frequency characteristics of the surface acoustic wave sensor 1 in the initial state by solid lines.
- the resonance indicated by the arrow X1 in FIG. 3 is the resonance due to the Rayleigh wave
- the resonance indicated by the arrow X2 is the resonance of the SH type surface wave.
- the broken lines in Fig. 3 show the impedance, frequency characteristics, and phase and frequency characteristics of the surface acoustic wave sensor in the liquid after immersion in ethanol.
- the resonance X 1 due to Rayleigh wave has weaker excitation in liquid
- the resonance X 2 due to SH type surface wave has less excitation. Is not weakened. This means that Rayleigh waves cannot be used as sensors in liquids. Therefore, by using the SH type surface wave, the function as a surface acoustic wave sensor can be reliably obtained even in a liquid.
- the surface acoustic wave sensor is configured to use the response of the SH type surface wave.
- Fig. 7 is a diagram showing the displacement of the surface wave generated on the LiTaOa substrate when ⁇ ⁇ (degree) of the Euler angles (0 °, ⁇ , 0 °) is changed. The amount of displacement is shown. Also, the displacement U 2 of the SH wave used by the one-point line in FIG. 7 shows the displacement U 1, the displacement U 1 shows the displacement of the P wave, and the displacement U 3 shows the displacement of the SV wave. As is clear from FIG. 7, when the Euler angle ⁇ is in the range of 0 ° to 18 ° and 58 ° to 180 °, the displacement U2 of the SH wave is large and stable, and SH Waves are mainly excited.
- the resonance of one Rayleigh wave is easily weakened, whereas the resonance of the SH type surface wave is hardly weakened. Therefore, the Euler angle ⁇ is between 0 ° and 18. And 5 8 ° ⁇
- L i T a 0 3 substrate in the range of 1 8 0 °, sufficiently excited is an SH wave It can be seen that the SH wave can be sufficiently excited even when immersed in the liquid.
- the Euler angle 1 is between 120 ° and 140. In the range of, it can be seen that the displacement U 3 of the resonance of the SV wave that appears near the resonance of the SH wave is very small. Therefore, preferably, by setting the Euler angle ⁇ in the range of 120 to 140 °, it is possible to more effectively prevent the characteristic deterioration in the liquid without being greatly affected by the SV wave.
- the Euler angle ⁇ is 0 ° to 1 8 ° and 58 ° ⁇ 1 80 °, particularly preferably more to the use of L i T a 0 3 substrate is 1. 20 to 140 °, even in the liquid It is possible to use SH waves that can reliably function as sensors.
- the Euler angle ⁇ is 0 ° to 18 as described above. Or it must be in the range of 58 ° to 180 °, but the boiler angle (0 °, 0. to 18 °, 0 ° ⁇ 5 °) or (0 °, 58 ° to 180., 0. ⁇ 5 °), the same effect can be obtained.
- a surface acoustic wave device having no reaction film was formed.
- the normalized film thickness of the interdigital electrode made of Au was changed to 0.4%, 2.0% and 5.5%, and three types of surface acoustic wave devices were prepared.
- Fig. 8 shows the characteristics of a surface acoustic wave device with a normalized interdigital electrode thickness of 2.0%. Then, the three kinds of surface acoustic wave devices prepared as described above were immersed in ethanol, and the alkanethiol compound was dropped to a concentration of 14 ⁇ 1/1.
- the altithiol compound used was 10- carboxy-11-decanethiol COOH— (CH 2 ) 10 —S ⁇ .
- the terminal S atom is used as an electrode Reacts with Au and forms a self-assembled monolayer on Au.
- a mass load is generated by the formed self-assembled monolayer, and the frequency of the surface acoustic wave sensor changes as in the case of the surface acoustic wave sensor 1 of the above-described embodiment.
- Fig. 4 shows the results.
- the horizontal axis in FIG. 4 represents the elapsed time (minutes) with the time at which the alkanethiol compound was dropped as 0, and the vertical axis represents the change in the resonance frequency of the resonance of the SH type surface wave (k H z).
- the adhesion layer by providing the adhesion layer, the adhesion between the reaction film formed on the adhesion layer and the interdigital electrode can be effectively increased. Therefore, the reliability of the surface acoustic wave sensor can be improved, and the change in the mass load on the reaction film can be measured with higher accuracy.
- the material constituting the adhesion layer is not limited to the above alkanethiol compound, but may be a derivative of the alkanethiol compound or another compound. Can be. Other compounds used include those made of any compound that can be coupled to a surface wave exciting electrode and L i T a 0 3 substrate.
- the frequency change is 35 ppm or more, while the temperature change at which 35 ppm frequency change occurs is 1 ° C. . Therefore, if the normalized film thickness of the electrode is in the range of 1.2 to 8.5%, a surface acoustic wave sensor capable of responding to a temperature change of 1 ° C can be provided.
- the frequency variation is 45 ppm or more, and when the electrode thickness is 3 to 5%, it is 55 ppm or more.
- the temperature change that causes a frequency change of 45 ppm is 1.3 ° C, and the temperature change that causes a frequency change of 55 ppm is 1.6 ° C. Therefore, if the normalized film thickness of the electrode is 1.9 to 6.6%, more preferably 3%,
- Example 1 36 ° rotated Y-plate L i T a 0 3 substrate, i.e., at Euler angles (0 °, 1 26 °, 0 °) using a rotating Y cut L i T a 0 3 substrate is, in example 4, L i T a 0 3 by changing the Euler angles and the normalized thickness of the substrate, constitute a variety of surface acoustic wave elements, measured by that frequency change in the same way the mass load experimental example 2 did.
- Figure 6 shows the results.
- Figure 6 shows the displacement when the Euler angle ⁇ is changed. From Fig. 6, it can be seen that the relationship between the normalized film thickness and the amount of frequency change hardly changes even when the Euler angle is changed. Thus, it is sufficient that the Euler angle is such that the SH wave is mainly excited.
- the Euler angles are (0 °, 0 ° to 18 °, 0 ° ⁇ 5 °) or (0., 58 ° to 180 °, 0 ° ⁇ 5 °).
- L i T a 0 3 substrate is to form a surface wave exciting electrode mainly composed of a u, if the normalized thickness of the electric pole from 0.8 to 9.5% and, It can be seen that the frequency change due to the mass load of the SH wave response can be measured with high accuracy. Therefore, in the present invention, the surface acoustic wave element configured as described above is used, and the reaction film 4 (see FIG. 1) is formed on the surface acoustic wave element, thereby detecting or detecting the substance to be detected. Quantitation can be performed with high precision.
- the reaction film itself is not particularly limited, and depends on the target substance to be measured. Further, an appropriate reaction film can be used. For example, as described in the above-mentioned Japanese Patent Application Laid-Open No. H10-90270, when detecting 2-MIB which causes mold odor, the method described in Japanese Patent Application Laid-Open No. H10-90270 is used. As described above, a membrane composed of a camphor II protein complex similar in structure to 2-MIB may be formed as a reaction membrane. When a specific DNA, antigen or antibody is detected, a reaction membrane containing a substance that specifically binds to the DNA, antigen or antibody may be used.
- reaction membrane is not limited to one that directly reacts with the substance to be detected and binds the substance to be detected, and may be configured to react with a substance that binds to the substance to be detected and bind the binding substance. Good.
- the reaction membrane has a substance that binds to a biological substance such as DNA, an antigen, or an antibody.
- a biosensor is provided in which the mass applied to the substrate surface of the surface acoustic wave sensor is changed. Therefore, the use of this biosensor enables highly accurate detection and quantification of a biological substance.
- a protective layer 7 is formed, the protective The adhesion layer 8 and the reaction film 4 are formed on the film 7. That is, the electrode 3 and the dielectric substrate 2 can be protected by disposing the protective film 7 between the adhesion layer 8 and the electrode 3.
- the protective film 7 in the case of using an insulating material such as S i 0 2
- the protective film 7 is formed not only on the electrode 3 but also on a region other than the electrode 3, whereby the adhesion layer 8 can be formed on the entire upper surface of the protective film 7. Can be done, and the sensor
- a protective film 7 made of S i 0 2 as the material for forming the adhesion layer 8, rather than the alkane thiol compounds include, for example, (CH 3 0) 3 S i C 3 H It is preferable to use a methoxysilane compound such as 6 OCH 2 CHCH 20 . This is because the methoxy group CH 30 has excellent adhesion to inorganic substances such as SiO 2 .
- the protective film 7 is provided between the electrode 3 and the adhesion layer 8, but as shown in FIG. 9B, the surface acoustic wave device without the adhesion layer 8 is provided. In this case, the protective film 7 may be provided. In the surface acoustic wave device shown in FIG. 9B, the protective film 7 is formed between the electrode 3 and the reaction film 4. In this case, it is possible by Rukoto using a protective film made of an insulating material such as S io 2, to prevent undesired shorting of the electrodes 3. In addition, since the protective film 7 is formed so as to extend not only to the upper surface of the electrode 3 but also to the outside of the electrode 3, the reaction film 4 can be formed on the entire surface of the protective film 7, thereby increasing the sensitivity. Can be enhanced.
- the elastic surface wave sensor having the same configuration as the surface acoustic wave sensor of the present invention except that it does not have a reaction film.
- Surface surfing shingles may be used as a reference.
- the difference between the frequency change at the time of liquid immersion in the surface acoustic wave sensor configured according to the present invention and the frequency change at the time of liquid immersion in the surface acoustic wave device provided as a reference is determined.
- the amount of frequency change due to liquid immersion can be ignored, and only the frequency change due to the adhesion of the detection target substance or the binding substance to the reaction film can be measured with high accuracy.
- the shape of the surface wave exciting electrode constituting the surface acoustic wave element is not particularly limited.
- the surface wave excitation electrode is configured to be a one-port surface wave resonator having one interdigital electrode 21 and reflectors 22 and 23. Is also good.
- a transversal type surface acoustic wave filter 30 in which the inter digital electrodes 31 and 32 are arranged separated in the surface wave propagation direction may be configured.
- a metal thin film 33 may be disposed between the interdigital electrodes 31 and 32 as necessary.
- the surface acoustic wave sensor according to the present invention uses the SH type surface wave and has an Euler angle of (0 °, 0 ° to 15; 0 ° ⁇ 5) or (0 °, 58 ° to 1). 80., 0 ° ⁇ 5 °) at a rotational Y force Tsu preparative L i T a 0 3 a Au on a substrate as a main component, 0.5 film thickness normalized by wavelength from 8 to 9.5% range due to the use of surface acoustic wave element table surface wave excitation electrodes are formed in, the surface acoustic: wave element L i T a 0 3 of frequency characteristics due to change in mass applied to the substrate surface Changes can be detected with high accuracy.
- the reaction layer so as to cover the L i T a 0 3 forming surface wave exciting electrode on the substrate is formed, and the detection target substance or above is bond by reacting with the reaction membrane bound
- the mass load caused by the binding of the detection target substance bound to the substance to the reaction film can be detected with high accuracy as a change in frequency characteristics. Therefore, in a surface acoustic wave sensor using various reaction films according to the substance to be detected, the sensitivity can be greatly increased by devising the structure of the surface acoustic wave element itself.
- the sensor sensitivity is improved by devising the reaction film, but in the present invention, the elasticity of the reaction film is formed.
- the sensitivity can be increased by devising the structure of the surface acoustic wave element itself.
- the surface wave excitation electrode is mainly composed of Au, Au does not easily react with other substances, so that contamination of the surface acoustic wave sensor does not easily occur, and deterioration of characteristics over time does not easily occur.
- the protective film When a protective film is further formed between the electrode and the reaction film or between the electrode and the adhesion layer, the protective film is made of an insulative material, and is immersed in a conductive liquid. In such a case, an undesired short circuit that may occur in the event of a short circuit can be prevented.
- the protective film since the protective film is formed so as to extend over the electrode and outside the electrode, a reaction film and an adhesion layer can be formed on the entire surface of the protective film, whereby the sensitivity can be increased. .
- the adhesion layer is made of an alkanethiol having an S atom at the end, the adhesion layer is firmly bonded to an electrode made of Au to form a self-assembled monolayer. Therefore, by forming the reaction layer on the adhesion layer, the reaction film can be firmly bonded to the surface acoustic wave device.
- the normalized thickness of the surface wave excitation electrode is in the range of 1.2 to 8.5%, more preferably in the range of 1.9 to 6.6%, and still more preferably in the range of 3.0 to 5.0. In this case, the sensitivity of the surface acoustic wave sensor can be more effectively increased.
- the reaction film has a substance that specifically binds to a biological substance as a detection target substance.
- the biological material is bonded to the surface of the The amount changes, and therefore, a biological substance can be detected or quantified with high accuracy by using the biosensor of the present invention.
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JP2005511304A JPWO2005003752A1 (ja) | 2003-07-04 | 2004-04-08 | 弾性表面波センサー |
US10/561,251 US7816837B2 (en) | 2003-07-04 | 2004-04-08 | Surface acoustic wave sensor |
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JP2003191759 | 2003-07-04 | ||
JP2003-191759 | 2003-07-04 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007178167A (ja) * | 2005-12-27 | 2007-07-12 | Japan Radio Co Ltd | 弾性波センサ及びその製造方法 |
WO2007145108A1 (ja) * | 2006-06-16 | 2007-12-21 | Murata Manufacturing Co., Ltd. | 液中物質検出センサ |
WO2007145011A1 (ja) * | 2006-06-15 | 2007-12-21 | Murata Manufacturing Co., Ltd. | 液中物質検出センサ |
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WO2009078089A1 (ja) * | 2007-12-17 | 2009-06-25 | Fujitsu Limited | 弾性波素子、通信モジュール、および通信装置 |
US8317392B2 (en) * | 2008-12-23 | 2012-11-27 | Honeywell International Inc. | Surface acoustic wave based micro-sensor apparatus and method for simultaneously monitoring multiple conditions |
FR2945067B1 (fr) * | 2009-02-23 | 2015-02-27 | Dav | Dispositif de commande d'un ouvrant |
US8047077B2 (en) * | 2009-03-16 | 2011-11-01 | Samsung Electronics Co., Ltd. | Surface acoustic wave sensor and sensing method using surface acoustic wave |
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JP4900387B2 (ja) * | 2006-06-16 | 2012-03-21 | 株式会社村田製作所 | 液中物質検出センサ |
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US8156814B2 (en) | 2007-02-19 | 2012-04-17 | Murata Manufacturing Co., Ltd. | Surface acoustic wave sensor |
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JP5170311B2 (ja) * | 2009-06-25 | 2013-03-27 | 株式会社村田製作所 | 弾性表面波センサー |
CN103604864A (zh) * | 2013-10-25 | 2014-02-26 | 中国电子科技集团公司第三十八研究所 | 一种基于导电复合敏感材料的声表面波甲醛气体传感器 |
CN103604864B (zh) * | 2013-10-25 | 2016-02-10 | 中国电子科技集团公司第三十八研究所 | 一种基于导电复合敏感材料的声表面波甲醛气体传感器 |
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US7816837B2 (en) | 2010-10-19 |
US20070107516A1 (en) | 2007-05-17 |
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