CN108955511B - Preparation method of transparent sensor for monitoring structural crack based on gas-liquid interface self-assembly - Google Patents
Preparation method of transparent sensor for monitoring structural crack based on gas-liquid interface self-assembly Download PDFInfo
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Abstract
The invention discloses a preparation method of a transparent sensor for monitoring a structural crack based on gas-liquid interface self-assembly, and relates to a preparation method of a transparent sensor for monitoring a structural crack. The invention aims to solve the defects that the prior art uses toxic organic solvents and has complex treatment process. The SWCNTs are not purified, any toxic organic solvent is not used, the environmental protection is greatly improved, and the large-area preparation can be simply realized. On the basis of an L-B technology and a self-assembly method, a uniformly distributed SWCNTs conductive network is prepared on a gas-liquid interface by utilizing Van der Waals force between carbon nano tubes and the thrust action of an SDBS aqueous solution, and is transferred to a PDMS substrate by a bonding and pulling method to prepare a transparent conductive SWCNT film with a sandwich structure. The invention is used in the field of sensors.
Description
Technical Field
The invention relates to the field of sensors, in particular to a method for preparing a transparent sensor for monitoring structural cracks based on a gas-liquid interface.
Background
The cracks serving as mechanical sections can obviously change stress fields and strain fields in the structure, so that the integrity of the structure is damaged, the bearing capacity of the structure is further influenced, the damage rate of the structure is accelerated, and the concentrated reflection of the damage of the structure to a certain dangerous degree is realized. In order to ensure the safety, integrity and durability of the structure, effective technical means are needed to monitor the cracks in the structure, reasonably and accurately evaluate the safety condition of the structure, timely repair and control the damage of the structure, and prevent serious economic loss and severe social influence caused by disease development, performance degradation and sudden failure of the structure. At present, sensing elements for monitoring deformation and cracks of a concrete structure in the civil engineering field mainly comprise optical fibers, images, stress strain, piezoelectric sensing, intelligent skin, information coating technology and the like, however, the technical means have certain limitations for monitoring crack development, for example, when the crack is expanded to a large value, the bearing capacity of the concrete structure is still in a safe range, and the technical means cannot monitor the continuous development condition of the crack due to self damage. Therefore, a flexible sensor with large strain characteristics is important.
One first purifies the MWCNTs and SWCNTs, then disperses the MWCNTs in chloroform, and dissolves the SWCNTs in chloroformIn a mixed solution (85:15) of chloroform and DNF, a stable single-layer CNT film was prepared at the gas-liquid interface by the L-B method. One first treats SWCNTs with acid. And then functionalizing the SWCNTs by using Octadecylamine (ODA), dispersing the functionalized SWCNTs in chloroform, and obtaining the multilayer SWCNTs film with large area, high order and controllable thickness by an L-B method. After the scholars process the SWCNTs in the mixed solution of dichloroethane and PmpV, the SWCNTs are not subjected to any covalent functionalization in the process, and the SWCNTs adsorbed by the PmpV can be stably suspended in dichloroethane organic solvent. Then the dense aligned SWCNTs film is prepared by the L-B method. The method comprises the steps of modifying SWCNTs with imidazole salt, performing ultrasonic dispersion in an aqueous solution, adding trichloroethane, performing ultrasonic treatment on the mixed solution for 12 hours, and forming a layer of SWCNTs film by self-assembly of the SWCNTs-Im on a water-oil interface. One scholarly disperses SWCNTs on 1 ethyl 3 methyl imidazole acetate at room temperature to prepare stable suspension, the stable suspension is placed on a glass sheet, deionized water is poured into the glass sheet along an angle of 45 degrees, and after organic salts are dissolved in the water, the SWCNTs float on the surface of the deionized water to form a layer of film. The researchers disperse the lower suspension obtained by a series of treatments such as ultrasonic treatment and centrifugation of the mixed solution of SWCNTs and PFO-BPy in trichloromethane, the trichloromethane can rapidly expand and evaporate at a gas-liquid interface, and the orderly-arranged SWCNTs film is obtained by a self-assembly method. One first hydrophilizes and amine-functionalizes the silicon substrate and then soaks the silicon substrate in an aqueous solution of SWCNTs treated with acid, passing through-COOH and-NH2The electrostatic interaction between the SWCNTs and the organic polymer material realizes the self-assembly of the SWCNTs network structure.
The above 2 preparation methods use toxic organic solvents in the experimental process, and the carbon nanotubes need to be purified and functionalized.
Disclosure of Invention
The invention aims to solve the defects that toxic organic solvents are used and the treatment process is complex in the prior art, and provides a preparation method of a transparent sensor for monitoring structural cracks based on a gas-liquid interface.
A preparation method of a transparent sensor for monitoring structural cracks based on a gas-liquid interface comprises the following steps:
the method comprises the following steps: preparing a Polydimethylsiloxane (PDMS) substrate;
the method comprises the following steps: weighing polydimethylsiloxane and a polydimethylsiloxane curing agent according to the mass ratio of 10:1, and performing magnetic stirring to obtain a mixed solution of the polydimethylsiloxane and the polydimethylsiloxane curing agent;
the first step is: vacuum drying the mixed solution of dimethyl siloxane and a polydimethylsiloxane curing agent obtained in the step one by one to obtain a polydimethylsiloxane film;
step one is three: drying the polydimethylsiloxane film obtained in the first step and the second step to obtain a Polydimethylsiloxane (PDMS) substrate;
step two: preparing a transparent conductive SWCNT film;
step two, firstly: completely dissolving Sodium Dodecyl Benzene Sulfonate (SDBS) in deionized water to obtain a sodium dodecyl benzene sulfonate aqueous solution, and standing for later use;
step two: dispersing SWCNTs (single-walled carbon nanotubes) in the sodium dodecyl sulfate aqueous solution obtained in the second step, and performing ultrasonic dispersion to obtain a mixed solution of the SWCNTs and Sodium Dodecyl Benzene Sulfonate (SDBS), wherein the mass ratio of the SWCNTs to the Sodium Dodecyl Benzene Sulfonate (SDBS) is 1: 5;
step two and step three: centrifuging the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate obtained in the second step, taking out the upper suspension for later use, and removing solid substances at the bottom;
step two, four: taking the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate taken out in the step two and three, adding absolute ethyl alcohol, wherein the volume ratio of the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate to the absolute ethyl alcohol is 1:5, carrying out ultrasonic oscillation, then carrying out centrifugal separation, and dissolving the SWCNTs obtained by centrifugation into the absolute ethyl alcohol for later use;
step two and step five: sucking the mixed solution of the SWCNTs and the absolute ethyl alcohol obtained in the fourth step by using a dropper, slowly dripping the mixed solution into a glass vessel filled with 2/3-depth deionized water along the inner wall of the glass vessel, and stopping dripping when the area is about 2/3 of the area of the glass vessel after a layer of oily matter is formed on the upper layer of the water surface; dripping a small amount of sodium dodecyl benzene sulfonate aqueous solution prepared in the second step along the position of dripping the mixed solution of the SWCNTs and the absolute ethyl alcohol;
step two, step six: clamping the polydimethylsiloxane substrate prepared in the first step and the third step by using tweezers, slowly adhering oily substances floating in a transparent glass vessel to the polydimethylsiloxane substrate in an adhesion lifting mode, placing the substrate in an absolute ethyl alcohol solution, and cleaning the substrate with the SWCNTs adhered to the substrate with one surface facing downwards;
step two, seven: drying the polydimethylsiloxane substrate cleaned in the second six steps, testing the resistance of a test piece by using a universal meter, adding a conductive copper foil when measuring the resistance, and bonding the substrate and the copper foil by using conductive silver paste to obtain a transparent conductive SWCNT film;
step two eight: and (4) covering the Polydimethylsiloxane (PDMS) substrate obtained in the first step (III) on the transparent conductive SWCNT film obtained in the second step (VII) to obtain the transparent conductive SWCNT film with a sandwich structure.
The invention has the beneficial effects that:
the invention provides a method for preparing a transparent sensor for monitoring structural cracks based on gas-liquid interface self-assembly. And can simply realize large-area preparation. On the basis of an L-B technology and a self-assembly method, the invention utilizes Van der Waals force between carbon nano tubes and the thrust action of an SDBS aqueous solution to prepare a uniformly distributed SWCNTs conductive network on a gas-liquid interface, and the SWCNTs conductive network is transferred to a PDMS substrate by a bonding and pulling method to prepare a transparent conductive SWCNT film with a sandwich structure. The sensor is a large-deformation (more than 100%) tension-sensitive sensor, and in the monitoring process, when a power supply is abnormal, the width of a crack can be visually observed due to the transparency of the sensor, particularly the monitoring of the fatigue crack in the steel box girder.
The change rate of the transparent conductive SWCNT film resistance of the sandwich structure after 50 times of fatigue stretching shows good linear correlation within the strain range of 0-100%, and fitting linearity obtained by fitting test dataThe equation is: y is-10.608 +2.438x and the goodness of fit is R2The transparent conductive SWCNT film of the sandwich structure of the present invention has a susceptibility of 2.44 as defined by the susceptibility 0.986. The transparent conductive SWCNT film with the sandwich structure is a sensing material with good tensile sensitivity in a tensile strain range of 0-100%, and can be used as a sensor for monitoring structural cracks in the field of structural health monitoring.
Drawings
FIG. 1 is an SEM image of a single-layer SWCNTs network;
FIG. 2 is a graph of the transparency of transparent conductive SWCNT films with different numbers of layers of SWCNTs random conductive networks;
FIG. 3 shows the strain sensing performance of a transparent conductive SWCNT film with a sandwich structure after 50 fatigue elongations.
Detailed Description
The first embodiment is as follows: a preparation method of a transparent sensor for monitoring a structural crack based on gas-liquid interface self-assembly comprises the following steps:
the method comprises the following steps: preparing a Polydimethylsiloxane (PDMS) substrate;
the method comprises the following steps: weighing polydimethylsiloxane and a polydimethylsiloxane curing agent according to the mass ratio of 10:1, and performing magnetic stirring to obtain a mixed solution of the polydimethylsiloxane and the polydimethylsiloxane curing agent;
the first step is: vacuum drying the mixed solution of dimethyl siloxane and a polydimethylsiloxane curing agent obtained in the step one by one to obtain a polydimethylsiloxane film;
step one is three: drying the polydimethylsiloxane film obtained in the first step and the second step to obtain a Polydimethylsiloxane (PDMS) substrate;
step two: preparing a transparent conductive SWCNT film;
step two, firstly: completely dissolving Sodium Dodecyl Benzene Sulfonate (SDBS) in deionized water to obtain a sodium dodecyl benzene sulfonate aqueous solution, and standing for later use;
step two: dispersing SWCNTs (single-walled carbon nanotubes) in the sodium dodecyl sulfate aqueous solution obtained in the second step, and performing ultrasonic dispersion to obtain a mixed solution of the SWCNTs and Sodium Dodecyl Benzene Sulfonate (SDBS), wherein the mass ratio of the SWCNTs to the Sodium Dodecyl Benzene Sulfonate (SDBS) is 1: 5;
step two and step three: centrifuging the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate obtained in the second step, taking out the upper suspension for later use, and removing solid substances at the bottom;
step two, four: taking the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate taken out in the step two and three, adding absolute ethyl alcohol, wherein the volume ratio of the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate to the absolute ethyl alcohol is 1:5, carrying out ultrasonic oscillation, then carrying out centrifugal separation, and dissolving the SWCNTs obtained by centrifugation into the absolute ethyl alcohol for later use;
step two and step five: sucking the mixed solution of the SWCNTs and the absolute ethyl alcohol obtained in the fourth step by using a dropper, slowly dripping the mixed solution into a glass vessel filled with 2/3-depth deionized water along the inner wall of the glass vessel, and stopping dripping when the area is about 2/3 of the area of the glass vessel after a layer of oily matter is formed on the upper layer of the water surface; dripping a small amount of sodium dodecyl benzene sulfonate aqueous solution prepared in the second step along the position of dripping the mixed solution of the SWCNTs and the absolute ethyl alcohol;
step two, step six: clamping the polydimethylsiloxane substrate prepared in the third step by using tweezers, slowly adhering oily substances floating in a transparent glass vessel to the polydimethylsiloxane substrate in an adhesion lifting mode, placing the polydimethylsiloxane substrate in an absolute ethyl alcohol solution for cleaning, and enabling the surface adhered with SWCNTs to face downwards (repeating the second six steps to obtain SWCNTs random conductive networks with different layers);
step two, seven: drying the polydimethylsiloxane substrate cleaned in the second six steps, testing the resistance of a test piece by using a universal meter, adding a conductive copper foil when measuring the resistance, and bonding the substrate and the copper foil by using conductive silver paste to obtain a transparent conductive SWCNT film;
step two eight: covering the Polydimethylsiloxane (PDMS) substrate obtained in the first step on the transparent conductive SWCNT film obtained in the second step to obtain a transparent conductive SWCNT film with a sandwich structure (the PDMS substrate obtained in the first step is covered on one side of the SWCNTs random conductive network of the film obtained in the second step to obtain the transparent conductive SWCNT film with the sandwich structure), and thus obtaining the transparent sensor for monitoring the structural crack.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the steps, the magnetic stirring time is 10min, and the rotating speed is 300 rpm.
Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the second step, the vacuum drying time is 2 hours, and the temperature is 65 ℃.
Other steps and parameters are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the drying time in the first step and the third step is 2 hours, and the temperature is 65 ℃.
Other steps and parameters are the same as those in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the specific term of the sodium dodecyl benzene sulfonate aqueous solution obtained in the first step is as follows:
dissolving sodium dodecyl benzene sulfonate in deionized water, placing the solution in an oven with the temperature of 85 ℃ for standing for 10min, then carrying out ultrasonic treatment for 1h in an ultrasonic cleaning instrument with the power of 200W, stirring for 1h, and standing for later use.
Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: and in the second step, the ultrasonic dispersion time is 24 hours, and the temperature is 20-45 ℃.
Other steps and parameters are the same as those in one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and the time for centrifuging in the second step and the third step is 60min, and the rotating speed is 10000 rpm.
Other steps and parameters are the same as those in one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: and in the fourth step, the ultrasonic oscillation time is 30min, the centrifugation time is 60min, and the rotating speed is 10000 rpm.
Other steps and parameters are the same as those in one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: in the second six steps, the size of the polydimethylsiloxane substrate is 35mm multiplied by 10mm multiplied by 0.2 mm.
Other steps and parameters are the same as those in one to eight of the embodiments.
The first embodiment is as follows:
the preparation process of the transparent conductive SWCNT film with the sandwich structure in the test is as follows:
the method comprises the following steps: PDMS substrate preparation
(1) Weighing a PDMS body and a curing agent in a mass ratio of 10: 1. After magnetic stirring at 300rpm for 10min, the resulting liquid was introduced into a plastic petri dish in a certain mass.
(2) Horizontally placing the culture dish filled with the PDMS in a vacuum drying box, vacuumizing to remove air bubbles in the PDMS and enable the formed film to be uniform and flat, and vacuum drying for 2h at 65 ℃. The thickness of the film thus obtained was about 200. mu.m.
(3) And (3) placing the culture dish filled with the PDMS film after vacuum drying in an oven, and drying for 2h at 65 ℃.
Step two: transparent conductive SWCNT thin film preparation
(1) Sodium Dodecylbenzenesulfonate (SDBS) in water. Dissolving 64mgSDBS in deionized water, standing the solution in an oven at 85 deg.C for 10min, ultrasonically cleaning in an ultrasonic cleaner with 200W power for 1h, stirring for 1h, and standing. The aim of this procedure is essentially to obtain a sufficiently complete dissolution of the SDBS in the aqueous solution.
(2) 8.0mg of SWCNTs was dispersed in 5ml of the above aqueous solution of Sodium Dodecylsulfonate (SDBS) in a mass ratio of SWCNTs to SDBS of 1: 5. Ultrasonic dispersion is carried out for 24 hours at room temperature (20-45 ℃) and the power is 200W.
(3) The obtained SWCNTs/SDBS solution was centrifuged at 10000rpm for 60min, the upper suspension was poured into a clear glass bottle for further use, and the solid matter at the bottom was not removed.
(4) Measuring about 1ml of SWCNTs/SDBS mixed solution into a transparent glass bottle, adding 5ml of absolute ethyl alcohol, then carrying out ultrasonic oscillation for 30min, then carrying out centrifugal separation on the obtained solution at 10000rpm for 60min, finally dissolving the SWCNTs obtained by centrifugation into the absolute ethyl alcohol, and placing the obtained solution into the transparent glass bottle for later use.
(5) Sucking the mixed solution of SWCNTs/alcohol from the previous step by a dropper, slowly dropping the mixed solution into a glass dish of phi 96mm multiplied by 15mm containing 2/3-depth deionized water along the inner wall of the glass dish, and stopping dropping when the area is about 2/3 of the area of the glass dish after a layer of oily matter is formed on the upper layer of the water surface. Then, a small amount of the SDBS aqueous solution prepared in the first step is dripped along the position where the SWCNTs/alcohol mixed solution is dripped. The SDBS aqueous solution which is dripped later plays a certain thrust role, so that the SWCNTs conductive network formed by self-assembly at the gas-liquid interface is more compact and stable.
(6) Clamping the PDMS film prepared in the first step by using a pair of tweezers, wherein the size of the PDMS film is 35mm multiplied by 10mm multiplied by 0.2mm, slowly adhering oily matters floating in a transparent glass dish to the PDMS film by adopting an adhesion pulling mode, and then placing and cleaning the PDMS film in an absolute ethyl alcohol solution, wherein the side adhered with the SWCNTs faces downwards.
(7) Finally, the cleaned PDMS/SWCNTs film is placed in a 65 ℃ oven to be dried for 1 h. The resistance of the test piece was then tested with a multimeter. When measuring the resistance, a conductive copper foil with the thickness of 0.2mm is added, and the film and the copper foil are bonded by conductive silver paste.
SEM images of the single layer uniform and continuous SWCNTs random conductive network with good microstructural features are shown in figure 1.
FIG. 2 shows the transparency of the transparent conductive SWCNT films with different numbers of SWCNTs random conductive networks, and the transparency (550nm) of the transparent conductive SWCNT films with 1-6 SWCNTs random conductive networks are 98%, 93%, 91%, 89%, 81% and 79%, respectively.
Fig. 3 shows that the change rate of the transparent conductive SWCNT film resistance of the sandwich structure after 50 fatigue stretches shows good linear correlation within the strain range of 0-100%, and a fitting linear equation obtained by fitting test data is as follows: y is-10.608 +2.438x and the goodness of fit is R2The transparent conductive SWCNT film of this sandwich structure has a susceptibility of 2.44 as defined by the susceptibility 0.986. The transparent conductive SWCNT film with the sandwich structure is a sensing material with good tensile sensitivity in a tensile strain range of 0-100%, and can be used as a sensor for monitoring structural cracks in the field of structural health monitoring.
The present invention is capable of other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the spirit and scope of the present invention.
Claims (9)
1. A method for preparing a transparent sensor for monitoring structural cracks based on gas-liquid interface self-assembly is characterized by comprising the following steps: the preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly comprises the following steps:
the method comprises the following steps: preparing a polydimethylsiloxane substrate;
the method comprises the following steps: taking polydimethylsiloxane and a polydimethylsiloxane curing agent, and carrying out magnetic stirring to obtain a mixed solution of the polydimethylsiloxane and the polydimethylsiloxane curing agent;
the first step is: vacuum drying the mixed solution of dimethyl siloxane and a polydimethylsiloxane curing agent obtained in the step one by one to obtain a polydimethylsiloxane film;
step one is three: drying the polydimethylsiloxane film obtained in the first step and the second step to obtain a polydimethylsiloxane substrate;
step two: preparing a transparent conductive SWCNTs film;
step two, firstly: completely dissolving sodium dodecyl benzene sulfonate in deionized water to obtain a sodium dodecyl benzene sulfonate aqueous solution, and standing for later use;
step two: dispersing SWCNTs in the sodium dodecyl sulfate aqueous solution obtained in the second step, and performing ultrasonic dispersion to obtain a mixed solution of the SWCNTs and sodium dodecyl benzene sulfonate, wherein the SWCNTs are single-walled carbon nanotubes;
step two and step three: centrifuging the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate obtained in the second step, taking out the upper suspension for later use, and removing solid substances at the bottom;
step two, four: taking the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate taken out in the second step and the third step, adding absolute ethyl alcohol, carrying out ultrasonic oscillation and then carrying out centrifugal separation, and dissolving the SWCNTs obtained by centrifugation in the absolute ethyl alcohol for later use;
step two and step five: sucking the mixed solution of the SWCNTs and the absolute ethyl alcohol obtained in the fourth step by using a dropper, dripping the mixed solution into a glass vessel filled with 2/3-depth deionized water along the inner wall of the glass vessel, and stopping dripping when the area is about 2/3 of the area of the glass vessel after a layer of oily matter is formed on the upper layer of the water surface; dripping the prepared sodium dodecyl benzene sulfonate aqueous solution in the second step along the position of dripping the mixed solution of the SWCNTs and the absolute ethyl alcohol;
step two, step six: clamping the polydimethylsiloxane substrate prepared in the first step and the third step by using tweezers, adhering and pulling oily substances floating in a transparent glass vessel on the polydimethylsiloxane substrate in an adhering and pulling mode, placing the substrate in an absolute ethyl alcohol solution, and cleaning the substrate with the surface adhered with SWCNTs facing downwards;
step two, seven: drying the cleaned polydimethylsiloxane substrate in the second six steps, testing the resistance of a test piece by using a universal meter, adding a conductive copper foil when measuring the resistance, and bonding the substrate and the copper foil by using conductive silver paste to obtain a transparent conductive SWCNTs film;
step two eight: covering the polydimethylsiloxane substrate obtained in the first step three on the transparent conductive SWCNTs film obtained in the second step seven to obtain the transparent conductive SWCNTs film with a sandwich structure.
2. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 1, is characterized in that: in the steps, the mass ratio of the polydimethylsiloxane to the polydimethylsiloxane curing agent is 10:1, the magnetic stirring time is 10min, and the rotating speed is 300 rpm.
3. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 2, is characterized in that: in the second step, the vacuum drying time is 2 hours, and the temperature is 65 ℃.
4. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 3, is characterized in that: the drying time in the first step and the third step is 2 hours, and the temperature is 65 ℃.
5. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 4, is characterized in that: the specific term of the sodium dodecyl benzene sulfonate aqueous solution obtained in the first step is as follows:
dissolving sodium dodecyl benzene sulfonate in deionized water, placing the solution in an oven with the temperature of 85 ℃ for standing for 10min, then carrying out ultrasonic treatment for 1h in an ultrasonic cleaning instrument with the power of 200W, stirring for 1h, and standing for later use.
6. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 5, is characterized in that: in the second step, the mass ratio of the SWCNTs to the sodium dodecyl benzene sulfonate is 1:5, the ultrasonic dispersion time is 24 hours, and the temperature is 20-45 ℃.
7. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 6, is characterized in that: and the time for centrifuging in the second step and the third step is 60min, and the rotating speed is 10000 rpm.
8. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 7, is characterized in that: in the second step four, the volume ratio of the mixed solution of the SWCNTs and the sodium dodecyl benzene sulfonate to the absolute ethyl alcohol is 1:5, the ultrasonic oscillation time is 30min, the centrifugation time is 60min, and the rotating speed is 10000 rpm.
9. The preparation method of the transparent sensor for monitoring the structural crack based on the gas-liquid interface self-assembly, according to claim 8, is characterized in that: the size of the polydimethylsiloxanyl plate in the second step six is 35mm multiplied by 10mm multiplied by 0.2 mm.
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| CN106017748B (en) * | 2016-05-19 | 2018-09-21 | 北京印刷学院 | Condenser type pliable pressure sensor based on composite material dielectric layer and preparation method thereof |
| CN105957584A (en) * | 2016-07-05 | 2016-09-21 | 天津工业大学 | Graphene oxide/reduced graphene oxide-doped carbon nanotube flexible transparent conductive electrode and preparation method thereof |
| CN106644189B (en) * | 2016-12-13 | 2018-12-07 | 中国科学院深圳先进技术研究院 | Pliable pressure sensor and preparation method thereof |
| CN106595940A (en) * | 2016-12-30 | 2017-04-26 | 电子科技大学 | Flexible multifunctional sensor and preparation method thereof |
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