CN113152095A - Method for preparing high-durability hydrophobic sensor based on polypyrrole and polyaniline - Google Patents
Method for preparing high-durability hydrophobic sensor based on polypyrrole and polyaniline Download PDFInfo
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- 239000004744 fabric Substances 0.000 claims abstract description 64
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 31
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 31
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Images
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/12—Hydrophobic properties
Abstract
The invention discloses a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline, which comprises the following steps: (1) carrying out polydopamine dipping pretreatment on the original fabric; (2) sequentially dipping the fabric treated by the polydopamine in monomer solutions of polyaniline and pyrrole for polymerization; (3) and soaking the reacted fabric in a polydimethylsiloxane solution for hydrophobic treatment. The method solves the problems of low conductivity, poor stability and the like of the traditional pressure sensor, and the polydimethylsiloxane solution is used for processing the sensor to provide protection for the coating, so that the durability of the sensor is improved, and the sensor still keeps high conductivity and pressure detection performance under the corrosion treatment of acid, alkali and salt solution.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline.
Background
The moisture environment puts more strict requirements on the design of the sensor, and in a working environment with dense water vapor and moisture, because a large amount of water molecules are contained in the air, when a voltage is applied, the electronic equipment is in contact with the water molecules for a long time, and short circuit is more easily caused, so that the problems of equipment failure, faults and the like occur. In addition, in a harsh detection environment, the structure of the sensor is often easily damaged, which results in a reduction in detection capability and a loss of signal responsiveness. Therefore, the preparation of resistive sensors with hydrophobicity and stability is a new solution.
In addition, in current research, general resistive sensors are widely concerned due to simple working mechanism and testing method, however, sensors prepared by a dipping method are often poor in durability, so that the improvement of the durability of hydrophobic sensors is still a great challenge.
For example, patent CN201922490287.1 proposes a method for preparing a flexible fabric sensor with carbon nanofibers with a micro-convex lattice as a pressure-sensitive material layer by using an electrospinning technology, and patent CN202010443697.5 proposes a method for preparing a flexible hydrophobic fabric sensor by using PDMS and MXene. However, the sensors prepared in the above patents have the disadvantages that the durability of the sensors is not studied, and the performance and hydrophobicity of the sensors are studied, and the prepared sensors have poor durability and cannot be used in a severe environment. Patent CN201911204604.7 proposes a method for a high-tensile flexible strain sensor based on a two-component polyurethane wire, which has high durability, but the silicone rubber-based sensor prepared by the method still has the problems of low conductivity, poor skin adhesion of human body, harmful environment and the like.
In the invention, through the synergistic effect of the monomer polymerization method and the hydrophobic treatment of PDMS, polyaniline provides higher sensitivity of pressure response, and polypyrrole improves the conductivity of the sensor, so that the high-conductivity and high-durability hydrophobic fabric-based strain sensor is prepared. PDMS has excellent biocompatibility and does not influence the performance and the appearance of the sensor. The prepared PANI-PPy hydrophobic conductive fabric has excellent stable responsiveness to different deformations, and the durability of the sensor is improved due to PDMS treatment, so that the sensor can be widely applied to more severe conditions to maintain the conductivity of the sensor unaffected. The monitoring of daily human motion can be realized, and the underwater motion monitoring device has excellent responsiveness to underwater motion.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline. The prepared flexible strain sensor can still maintain excellent conductivity after the acid-base salt solution corrosion treatment.
The technical scheme of the invention is as follows:
a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline comprises the following specific steps:
(1) preparation of PDA Fabric
Adding a certain amount of DA into a Tris buffer solution, dissolving by ultrasonic, then adding sodium periodate, putting the washed fabric into the solution, stirring for reaction for 2 hours, washing by using ethanol and deionized water respectively, and drying for later use.
(2) Preparation of PDA-PANI fabric
And (3) immersing the PDA fabric prepared in the last step into an HCl solution, adding an aniline monomer solution, carrying out ultrasonic treatment to obtain a mixed solution, then adding an ammonium persulfate solution, reacting for 24 hours under an ice bath condition, washing with ethanol and deionized water after the reaction is finished, and drying in an oven at 90 ℃ for later use.
(3) Preparation of PDA-PANI-PPy fabric
Adding 4 mg/mL pyrrole monomer solution into 40 mL deionized water solution, putting the PDA-PANI fabric prepared in the previous step into the solution, adding FeCl into the solution after uniformly stirring3Stirring the solution evenly, reacting in an ice bath for 2 hours, and washing the obtained PDA-PANI-PPy fabric after the reaction is finishedWashing and drying for later use.
(4) Preparation of hydrophobic PDA-PANI-PPy fabric
And (3) soaking the PDA-PANI-PPy fabric prepared in the last step into a normal hexane solution of PDMS, and exploring different soaking times to prepare the high-durability hydrophobic sensor.
Further, the mass of the DA in the step (1) is 2mg/mL, and the mass of the sodium periodate is 0.1 g.
Further, the concentration of the aniline monomer solution in the step (2) is 2mg/mL, and the concentration of the pyrrole monomer solution in the step (3) is 4 mg/mL.
Further, the mass fraction of PDMS in the n-hexane solution of PDMS in the step (4) is 1.4%.
The invention has the advantages that:
(1) through the chemical polymerization of aniline, the sensitivity of the sensor is greatly improved, so that the sensor has good responsiveness to tensile deformation. In order to obtain lower resistance and improve the conductivity, pyrrole is further polymerized on the surface of the sensor, and the resistance of the sensor is reduced from 10 k omega to 100 omega due to the excellent polymerization degree of the polypyrrole on the surface of the fabric.
(2) Due to the fact that the sensor has excellent durability due to the hydrophobic treatment of the sensor, the sensor still keeps high conductivity after being scratched by acid, alkali and sand paper. And after 100 times of abrasive paper scraping treatment, the detection capability of the finger bending deformation is still maintained. And the resistance of the fabric which is not subjected to hydrophobic treatment can be increased sharply, and the responsiveness to human motion monitoring can be lost, so that the durability and the stability of the sensor are greatly improved by the PDMS treatment.
(3) The hydrophobization PANI-PPy sensor can not only realize the monitoring of the common human body movement, but also realize the monitoring of different movements of fingers under water, and the stable repeatability and the flexible detection range of the sensor can be applied to underwater monitoring occasions to realize tasks such as underwater rescue.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor; wherein:
FIG. 1 is a schematic diagram of a process for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline according to the present invention;
FIG. 2 is an SEM image of a polypyrrole and polyaniline based high durability hydrophobic sensor of the present invention after polymerization of pyrrole and aniline;
FIG. 3 is an optical diagram of a polypyrrole and polyaniline based high durability hydrophobic sensor of the present invention after deposition of PANI on the surface with or without PDA treatment;
FIG. 4 is an SEM image of a high durability hydrophobic sensor prepared based on polypyrrole and polyaniline according to the present invention after being processed by PDMS;
FIG. 5 is a graph of resistance change after different polymerization reactions for preparing a high durability hydrophobic sensor based on polypyrrole and polyaniline;
FIG. 6 is a graph of resistance and contact angle changes at different times of hydrophobic treatment for preparing a high durability hydrophobic sensor based on polypyrrole and polyaniline;
FIG. 7 is a graph showing contact angle sizes of different liquid drops on the surface of a high-durability hydrophobic sensor prepared based on polypyrrole and polyaniline;
FIG. 8 is a graph of the detection of bending of an underwater finger after abrasion paper scraping of a highly durable hydrophobic sensor made from polypyrrole and polyaniline according to the present invention in comparison to the sensor made in comparative example 1;
fig. 9 is a current diagram showing the regular response of a hydrophobic fabric sensor to underwater finger bending.
Detailed Description
The invention provides a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline, which comprises the following steps:
(1) carrying out dopamine pretreatment on the fabric;
(2) preparing polyaniline/polypyrrole fabric with high conductivity;
(3) hydrophobic treatment was performed using PDMS.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
The method comprises the following steps: dopamine pretreatment of fabrics
In one embodiment, this step may be specifically performed as follows: adding 2mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.1 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
In one embodiment, this step may be specifically performed as follows: putting the PDA fabric prepared in the last step into 40 mL of 1 mol/L HCl solution, adding 36.54 mu L of aniline solution, carrying out ultrasonic treatment to obtain a mixed solution, adding 86.57 mg of ammonium persulfate solution, reacting for 12 hours under an ice bath condition, after the reaction is finished, washing with ethanol and deionized water, drying in an oven at 90 ℃, then immersing in 4 mg/mL of pyrrole solution, and after the mixture is uniformly stirred, adding 0.38 g of FeCl into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Step three: hydrophobic treatment with PDMS
In one embodiment, this step may be specifically performed as follows: the PDA-PANI-PPy fabric prepared in the previous step is immersed in a 2mg/mL PDMS solution of n-hexane for 1 minute to prepare a high durability hydrophobic sensor.
Referring to fig. 1, fig. 1 is a schematic diagram of a process for preparing a highly durable hydrophobic sensor based on polypyrrole and polyaniline. As shown in fig. 1, a high durability fabric sensor was prepared through a monomer polymerization process.
Referring to fig. 2, fig. 2 is an SEM image of a high durability hydrophobic sensor prepared based on polypyrrole and polyaniline according to the present invention, and fig. 2a is a graph showing that PDA particles are polymerized on the surface of fabric fibers after PDA treatment; FIG. 2b shows the linear structure of the PANI after polymerization on the fabric surface; FIG. 2c shows that PPy has a flower cluster particle shape on the surface of the fabric fiber.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are further described below. The invention is not limited to the embodiments listed but also comprises any other known variations within the scope of the invention as claimed.
First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention is described in detail by using the schematic structural diagrams, etc., and for convenience of illustration, the schematic diagrams are not enlarged partially according to the general scale when describing the embodiments of the present invention, and the schematic diagrams are only examples, which should not limit the scope of the present invention. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
In addition, the acronyms referred to in the invention are all fixed acronyms in the field, wherein part of the letters are explained as follows: PDMS: poly-dopamine: a PDA; polydimethylsiloxane; PANI is polyaniline; PPy is polypyrrole; SEM image: the image is displayed by electronic scanning.
Example one
The method for preparing the high-durability resistance-type hydrophobic sensor based on polypyrrole and polyaniline comprises the following steps:
the method comprises the following steps: PDA pretreatment of fabrics
In one embodiment, this step may be specifically performed as follows: adding 3 mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.2 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
In one embodiment, this step may be specifically performed as follows: putting the PDA fabric prepared in the last step into 40 mL of 2 mol/L HCl solution, adding 36.54 mu L of aniline solution, carrying out ultrasonic treatment to obtain mixed solution, adding 86.57 mg of ammonium persulfate solution, reacting for 12 hours under the ice bath condition, after the reaction is finished, washing with ethanol and deionized water, drying in an oven at 90 ℃, then immersing in 4 mg/mL of pyrrole solution, and after the solution is uniformly stirred, adding 0.38 g of FeCl into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Step three: hydrophobic treatment with PDMS
In one embodiment, this step may be specifically performed as follows: the PDA-PANI-PPy fabric prepared in the previous step is immersed in a 2mg/mL solution of PDMS in n-hexane for 2 minutes to prepare a high-durability hydrophobic sensor.
Please refer to fig. 1 for a process of manufacturing a high durability hydrophobic sensor based on polypyrrole and polyaniline according to this embodiment.
Example two
The embodiment prepares the high-durability hydrophobic sensor based on polypyrrole and polyaniline according to the following steps:
the method comprises the following steps: dopamine pretreatment of fabrics
In one embodiment, this step may be specifically performed as follows: adding 4 mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.1 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
In one embodiment, this step may be specifically performed as follows: the PDA fabric prepared in the previous step was put into 40 mL of 3 mol/L HCl solution, and 36.54. mu.L of aniline solution was added, sonicated to mix the solution, and 86.57 mg of ammonium persulfate was addedThe solution reacts for 12 hours under the ice bath condition, after the reaction is finished, ethanol and deionized water are used for washing, the solution is dried in a baking oven at the temperature of 90 ℃, then the solution is immersed into 4 mg/mL pyrrole solution, and after the solution is uniformly stirred, 0.38 g FeCl is added into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Step three: hydrophobic treatment with PDMS
In one embodiment, this step may be specifically performed as follows: the PDA-PANI-PPy fabric prepared in the previous step is immersed in 4 mg/mL PDMS in hexane for 1 minute to prepare a high durability hydrophobic sensor.
Referring to fig. 3, the effect of depositing polyaniline on the surface treated with or without PDA in the method for preparing a high-durability resistive hydrophobic sensor based on polypyrrole and polyaniline according to this embodiment is more uniform.
Please refer to fig. 4, which is an SEM image of hydrophobic surface treatment of the method for preparing a high-durability resistive hydrophobic sensor based on polypyrrole and polyaniline prepared in this embodiment, fig. 4 is a diagram illustrating that a fabric after polypyrrole reaction is immersed in a PDMS solution, and surfaces of polypyrrole particles are covered by a PDMS film.
EXAMPLE III
The method for preparing the high-durability resistance-type hydrophobic sensor based on polypyrrole and polyaniline comprises the following steps:
the method comprises the following steps: dopamine pretreatment of fabrics
In one embodiment, this step may be specifically performed as follows: adding 5 mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.2 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
In one embodiment, this step may be specifically performed as follows: the PDA fabric prepared in the previous step is put into 40 mL of 5 mol/L HCl solution, and 36.54 mu L of benzene is addedPerforming ultrasonic treatment on an amine solution to obtain a mixed solution, adding 86.57 mg of ammonium persulfate solution, reacting for 12 hours under an ice bath condition, after the reaction is finished, washing with ethanol and deionized water, drying in a 90-DEG C oven, then soaking in 4 mg/mL of pyrrole solution, and after uniformly stirring, adding 0.75 g of FeCl into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Step three: hydrophobic treatment with PDMS
In one embodiment, this step may be specifically performed as follows: the PDA-PANI-PPy fabric prepared in the previous step was immersed in 4 mg/mL of PDMS in n-hexane for 3 minutes to prepare a hydrophobic conductive fabric.
Referring to fig. 5, resistance changes of the high-durability hydrophobic sensor prepared based on polypyrrole and polyaniline after different polymerization reactions are shown, and fig. 5 shows that resistance of a fabric is reduced from 20M Ω to 100 Ω after the poly-dopamine, polyaniline and polypyrrole reactions.
Example four
The method for preparing the high-durability resistance-type hydrophobic sensor based on polypyrrole and polyaniline comprises the following steps:
the method comprises the following steps: dopamine pretreatment of fabrics
In one embodiment, this step may be specifically performed as follows: adding 5 mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.2 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
In one embodiment, this step may be specifically performed as follows: putting the PDA fabric prepared in the last step into 40 mL of 5 mol/L HCl solution, adding 36.54 mu L of aniline solution, carrying out ultrasonic treatment to mix the solution, adding 86.57 mg of ammonium persulfate solution, reacting for 12 hours under the ice bath condition, after the reaction is finished, washing with ethanol and deionized water, drying in an oven at 90 ℃, and then immersing in the oven4 mg/mL pyrrole solution, after stirring well, adding 0.75 g FeCl into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Step three: hydrophobic treatment with PDMS
In one embodiment, this step may be specifically performed as follows: the PDA-PANI-PPy fabric prepared in the previous step was immersed in a 7 mg/mL solution of PDMS in n-hexane for 10 minutes to prepare a hydrophobic conductive fabric.
The contact angle and the resistance change of the fabric, which is prepared based on polypyrrole and polyaniline and subjected to corrosion treatment, of the surface of the high-durability hydrophobic sensor prepared in this embodiment are shown in table 1.
Comparative example 1
The polyaniline and polypyrrole strain sensors without hydrophobic treatment are prepared according to the following steps:
the method comprises the following steps: dopamine pretreatment of fabrics
Adding 3 mg/mL of DA into a Tris buffer solution, dissolving by ultrasonic, then adding 0.2 g of sodium periodate, putting the washed fabric into the solution, reacting for 2 hours under stirring, washing with ethanol and deionized water respectively, and drying for later use.
Step two: preparation of polyaniline/polypyrrole fabric with high conductivity
Putting the PDA fabric prepared in the last step into 40 mL of 2 mol/L HCl solution, adding 36.54 mu L of aniline solution, carrying out ultrasonic treatment to obtain mixed solution, adding 86.57 mg of ammonium persulfate solution, reacting for 12 hours under the ice bath condition, after the reaction is finished, washing with ethanol and deionized water, drying in an oven at 90 ℃, then immersing in 4 mg/mL of pyrrole solution, and after the solution is uniformly stirred, adding 0.38 g of FeCl into the solution3The solution is stirred evenly and reacts in an ice bath for 2 hours, and after the reaction is finished, the solution is washed and dried for standby.
Referring to fig. 8, fig. 8 is a graph comparing the performance of the strain sensors prepared in comparative example 1 and example 1 in the finger bending test after being scratched with sandpaper, in which red lines in fig. 8 represent regular responses to underwater pressure after being subjected to hydrophobic treatment, and black lines represent irregular responses to underwater pressure without being subjected to hydrophobic treatment. Please refer to fig. 9 for a response graph of the sensor prepared in this embodiment to bending of an underwater finger, and fig. 9 is a current graph of a regular response of the hydrophobic fabric sensor to bending of an underwater finger.
Referring to fig. 6, when PDMS is immersed for 1 minute, the contact angle of the surface increases to a maximum value, and the resistance does not change greatly.
Referring to fig. 7, the contact angles of the high-durability hydrophobic sensor prepared based on polypyrrole and polyaniline for different liquid drops are shown, and the contact angles of the sensor for different liquid drops, such as milk and tea, are all greater than 140 °.
Referring to tables 1 and 2, table 1 shows the change of the surface contact angle and resistance of a high-durability hydrophobic sensor prepared based on polypyrrole and polyaniline according to the present invention after hydrophobic treatment, and table 2 shows the change of the surface contact angle and resistance of a polypyrrole and polyaniline sensor without hydrophobic treatment, which proves that the surface resistance of the sensor is more stable after hydrophobic treatment, and the surface resistance of the sensor is higher without hydrophobic treatment.
The prepared strain sensor with high durability has wide application prospect in the fields of human motion detection, photothermal conversion, health protection and the like.
In the above four embodiments, a PANi/PPy resistive sensor with hydrophobic property is designed through a monomer polymerization method and a PDMS coating process, please refer to fig. 3, where fig. 3 shows that the highly durable hydrophobic sensor PDA prepared based on polypyrrole and polyaniline according to the present invention is pretreated to make the deposition of polyaniline and polypyrrole more uniform.
In conclusion, the invention discloses a method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline, and the prepared sensor has good responsiveness to pressure, excellent durability and stability, can be applied to human motion detection, and can be further expanded to be used in the fields of underwater rescue and the like.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline is characterized by comprising the following steps:
(1) carrying out polymerization pretreatment on the original fabric through dopamine;
(2) carrying out polymerization reaction on polydopamine fabric obtained by dopamine treatment in an aniline monomer solution to obtain polydopamine/polyaniline fabric, and then carrying out polymerization reaction in a pyrrole monomer solution to obtain polydopamine/polyaniline/polypyrrole fabric;
(3) and (3) performing hydrophobic treatment on the polydopamine/polyaniline/polypyrrole fabric prepared in the step (2) in a normal hexane solution of polydimethylsiloxane to prepare the high-durability hydrophobic sensor.
2. The method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline according to claim 1, wherein: the concentration of the dopamine in the step (1) is 2 mM.
3. The method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline according to claim 1, wherein: the polymerization pretreatment time in the step (1) is 2 hours.
4. The method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline according to claim 1, wherein: the concentration of the aniline monomer solution in the step (2) is 2mg/mL, and the concentration of the pyrrole monomer solution is 4 mg/mL.
5. The method for preparing the high-durability hydrophobic sensor based on polypyrrole and polyaniline according to claim 1, wherein the method comprises the following steps: and (3) the aniline polymerization reaction condition of the step (2) is reaction for 24 hours under ice bath.
6. The polypyrrole and polyaniline based high durability hydrophobic sensor according to claim 1, wherein: and (3) the pyrrole polymerization reaction in the step (2) is carried out for 2 hours in an ice bath.
7. The method for preparing a high-durability hydrophobic sensor based on polypyrrole and polyaniline according to claim 1, wherein: the mass fraction of PDMS in the n-hexane solution of polydimethylsiloxane used in the step (3) is 1.4%.
8. A highly durable hydrophobic sensor made according to the method of any one of claims 1 to 7.
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