Preparation method of SWCNTs-CTS-ZnO thin film, thin film and detection device

Abstract

The invention discloses an SWCNTs-CTS-ZnO film preparation method, a film and a detection device, and the SWCNTs-CTS-ZnO film preparation method comprises the following steps: mixing a zinc acetate solution with a dopant, adding a chitosan solution and a carbon nanotube dispersion liquid, stirring to form a mixed liquid, carrying out a hydrothermal reaction, and after the hydrothermal reaction is finished, carrying out vacuum drying to obtain the SWCNTs-CTS-ZnO film. Cooling and washing to obtain a carbon nanotube-doped nano material, and dispersing the carbon nanotube-doped nano material in deionized water to form a suspension; and coating the suspension on a substrate, and carrying out drying and annealing treatment to obtain the SWCNTs-CTS-ZnO thin film. The SWCNTs adopted by the SWCNTs-CTS-ZnO thin film has relatively high specific surface area and excellent conductivity and provides abundant adsorption sites for acetone molecules, and chitosan is a natural high polymer material and can enhance selective adsorption of acetone through intermolecular interaction and reduce interference of other gases in expired gas; due to the gas-sensitive characteristic of the ZnO semiconductor, the sensitivity and response speed of the film to acetone are further improved, and quick response to acetone concentration change is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of human breath acetone detection, and in particular to a SWCNTs-CTS-ZnO film preparation method, the film and a detection device. Background Art

[0002] Due to insufficient insulin, the body of patients with diabetes (especially type 1 diabetes) cannot effectively utilize glucose for energy. Instead, it breaks down fat to produce energy. This process produces large amounts of ketone bodies (including acetone, β-hydroxybutyrate, and acetoacetate). When ketone body accumulation in the body exceeds the liver's metabolic capacity, it can cause ketoacidosis, manifested by a significant increase in acetone concentration in breath (normally 0.3–1.0 ppm in healthy individuals, but can rise to 5–50 ppm or even higher in diabetic ketoacidosis). Early detection of breath acetone can promptly identify the risk of ketosis and prevent serious complications such as coma and organ damage.

[0003] Currently, the main method is to calculate the acetone concentration by converting the electrical signal based on the adsorption of acetone by metal oxides (such as SnO2). However, this method is susceptible to interference from other gases in the exhaled breath (such as ethanol, water vapor, CO2), resulting in false positives. In addition, the sensitivity is insufficient, and the detection limit is usually at the ppm level (1-10ppm), which is difficult to meet the monitoring needs of early diabetic ketosis (acetone concentration <5ppm). Summary of the Invention

[0004] The present invention provides a SWCNTs-CTS-ZnO film preparation method, film and detection device to solve the above technical problems.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A method for preparing a SWCNTs-CTS-ZnO thin film comprises the following steps:

[0007] S1: mixing a zinc source and a dopant, adding a chitosan solution and a carbon nanotube dispersion, stirring to form a mixed solution, and performing a hydrothermal reaction. After the hydrothermal reaction is completed, cooling and washing to obtain a nanomaterial doped with carbon nanotubes, which is then dispersed in deionized water to form a suspension;

[0008] S2: The suspension is coated on a PET substrate, and after drying and annealing, a SWCNTs-CTS-ZnO thin film is obtained.

[0009] Preferably, the zinc source is zinc acetate solution, and the concentration of the zinc acetate solution is 0.03 g / mL;

[0010] The concentration of the carbon nanotube dispersion was 100 mg / mL;

[0011] The concentration of chitosan solution was 4 mg / mL;

[0012] The doping agent is sodium nitrate solution, and the concentration of the sodium nitrate solution is 0.5 mol / L;

[0013] In S1, the volume ratio of zinc acetate solution to chitosan solution, dopant, and carbon nanotube dispersion is 50:1:10:20.

[0014] Preferably, the chitosan solution is prepared by dissolving 2 g of chitosan in 80 ml of 1% acetic acid aqueous solution, heating to 60° C. and stirring continuously for 2 hours until the solution becomes clear and transparent, thereby completing the preparation of the chitosan solution.

[0015] Preferably, the specific method for preparing the carbon nanotube dispersion is: adding single-walled carbon nanotubes into deionized water, and ultrasonically treating the water for 2-3 hours to disperse the carbon nanotubes to form a carbon nanotube dispersion with a concentration of 100 mg / mL.

[0016] A SWCNTs-CTS-ZnO film is prepared by the above-mentioned method for preparing a SWCNTs-CTS-ZnO film.

[0017] A self-powered device for rapid detection of acetone concentration in human exhaled breath comprises: a housing, a baffle arranged in the housing, an elastic member, and a spiral TENG module sensitive to acetone concentration. The baffle divides the inner cavity of the housing into an installation cavity and a gas collecting cavity. The spiral TENG module and the elastic member are arranged in the installation cavity. The housing is provided with an exhalation hole connected to the gas collecting cavity, and the baffle is provided with an air hole connecting the gas collecting cavity and the installation cavity. The baffle moves under the action of human exhalation, the elastic member has a tendency to hinder the movement of the baffle, and the spiral TENG module generates electricity by friction driven by the baffle.

[0018] Preferably, the spiral TENG module includes: a PDMS film, a first electrode, a substrate, a second electrode and a chitosan-doped zinc oxide SWCNTs-CTS-ZnO film. The PDMS film, the first electrode, the substrate, the second electrode and the chitosan-doped zinc oxide SWCNTs-CTS-ZnO film are stacked and bonded in sequence to form a spiral structure.

[0019] Preferably, the first electrode and the second electrode are electrically connected to the signal processing module via a wire.

[0020] Preferably, the housing is provided with an air outlet hole for connecting the installation cavity to the outside of the housing.

[0021] Preferably, the air holes and the air outlet holes are staggered.

[0022] Beneficial effects:

[0023] The present application discloses a SWCNTs-CTS-ZnO film. Single-walled carbon nanotubes (SWCNTs) have a high specific surface area and excellent conductivity, providing abundant adsorption sites for acetone molecules and amplifying the weak signal caused by acetone adsorption. Chitosan (CTS) is a natural polymer material that can enhance the selective adsorption of acetone through intermolecular interactions and reduce interference from other gases in exhaled breath. The gas-sensitive properties of the ZnO semiconductor further enhance the film's sensitivity and response speed to acetone. The redox reaction between surface oxygen species and acetone molecules rapidly changes the material's carrier concentration, achieving a rapid response to changes in acetone concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 This is a schematic diagram of the structure of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention. Figure 2 ;

[0027] Figure 3 This is a front view of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention;

[0028] Figure 4 A bottom view of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention;

[0029] Figure 5 for Figure 4 Cross-sectional view of AA;

[0030] Figure 6 for Figure 5 Partial enlarged view of B in FIG;

[0031] Figure 7 Graph showing the output voltage test results of the SWCNTs-CTS-ZnO thin films prepared in Example 1 of the present invention and the comparative group;

[0032] Figure 8This is a test graph of the output voltage of a self-powered rapid detection device for acetone concentration in human breath at different acetone concentrations disclosed in Example 2 of the present invention;

[0033] Figure 9 This is a test graph showing the relationship between the output voltage and respiratory frequency of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention;

[0034] Figure 10 This is a test graph showing the response of a self-powered rapid detection device for acetone concentration in human breath disclosed in Example 2 of the present invention to 10 ppm acetone and other interfering biomarkers;

[0035] Figure 11 This is a graph comparing the output voltages of a self-powered rapid detection device for acetone concentration in human exhaled breath after stabilization for normal exhaled breath and simulated gas, as disclosed in Example 2 of the present invention.

[0036] 1. Shell; 11. Exhalation hole; 2. Baffle; 21. Air hole; 22. Exhaust hole; 3. Elastic part; 4. Spiral TENG module; 41. PDMS film; 42. First electrode; 43. Substrate; 44. Second electrode; 45. Chitosan-doped zinc oxide SWCNTs-CTS-ZnO film. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1

[0039] A method for preparing a SWCNTs-CTS-ZnO thin film comprises the following steps:

[0040] S1: Using zinc acetate (Zn(CH3COO)2·2H2O) as a Zn source, weighing 1.5g of zinc acetate and dissolving it in 50ml of deionized water, stirring it with a magnetic stirrer for 30 minutes to ensure complete dissolution, forming a zinc acetate solution with a concentration of 0.03g / mL; weighing 0.2g of chitosan (deacetylation degree greater than 90%), dissolving it in 50ml of 1% acetic acid aqueous solution, heating it to 60°C and stirring it continuously for 2 hours until the solution is clear and transparent, to prepare a chitosan solution with a concentration of 4mg / mL; selecting a sodium nitrate (NaNO3) solution with a concentration of 0.5mol / L as a dopant, measuring 10ml for standby use; weighing 10g of single-walled carbon nanotubes (SWCNTs), adding it to 100ml of deionized water, and ultrasonically treating it for 2-3 hours to uniformly disperse it to form a carbon nanotube dispersion with a concentration of 100mg / mL, which is standby use;

[0041] A PET substrate with a size of 5 cm × 5 cm was cut and ultrasonically cleaned with deionized water and ethanol, respectively. It was then dried on a hot plate at 80°C for 20 minutes. To enhance the adhesion between the film and the substrate, it was treated with ultraviolet ozone (UVO) for 10 minutes and then used.

[0042] The prepared zinc source zinc acetate solution and the dopant sodium nitrate solution were mixed, and then 1 ml of the chitosan CTS solution was added, and then 20 ml of the carbon nanotube dispersion was added. The mixture was fully stirred to obtain a mixed solution, and the mixed solution was transferred to a polytetrafluoroethylene (PTFE)-lined autoclave and subjected to a hydrothermal reaction at 200° C. for 12 hours. After the hydrothermal reaction was completed and cooled to room temperature, the mixture was centrifuged and washed three times with deionized water and ethanol to obtain a CTS-ZnO nanomaterial doped with carbon nanotubes, which was then uniformly dispersed in 10 ml of deionized water to prepare a suspension.

[0043] S2: On the pretreated PET substrate, a dispensing machine is used to dispense glue layer by layer: First, 5 ml of the suspension is evenly applied on the pretreated PET substrate to form a first sensitive layer with a thickness of about 5 μm. After natural drying for 10 minutes, the second sensitive layer is applied. The above operation is repeated until a multi-layer sensitive layer (film) with a total thickness of about 20 μm is formed; the film is placed in a vacuum drying oven and dried at 60°C and a vacuum degree of 0.08 MPa for 6 hours to remove residual solvent and prevent the film from cracking; then, The film was placed in a tube furnace for annealing treatment, heated to 300°C and maintained for 2 hours. The heating rate was controlled at 5°C / min to enhance the crystallinity of the ZnO nanostructure and the overall stability of the film, while optimizing the interaction between chitosan, carbon nanotubes and ZnO. After the annealing was completed, it was removed from the tube furnace and cooled at room temperature. Finally, the film was peeled off from the PET substrate on an ultra-clean workbench, and the single-walled carbon nanotube-doped CTS-ZnO sensitive film was completed, that is, the SWCNTs-CTS-ZnO film was obtained.

[0044] In order to explore the optimal dosage of CTS solution, the following control experiment was set up:

[0045] Control group 1:

[0046] The difference between this control group and the example group (Example 1) is that in this control group, the amount of CTS solution added is 5 ml.

[0047] Control group 2:

[0048] The difference between the control group and the example group (Example 1) is that in the control group, the amount of CTS solution added is 0.2 ml.

[0049] The output voltage of the SWCNTs-CTS-ZnO thin film materials prepared in the embodiment group (Example 1) and the control groups 1 and 2 was tested under different humidity conditions. The results are as follows: Figure 7 As shown, in order to facilitate the comparison between Example 1 and the control group, the output voltage test results of the SWCNTs-CTS-ZnO thin film materials prepared in Example 1, Control Group 1, and Control Group 2 under different humidity conditions are integrated into one figure, corresponding to the conditions of 0% RH, 20% RH, 40% RH, 60% RH, and 80% RH, respectively. Figure 7It can be seen that the CTS material selection ratio in Example 1 shows the highest output performance in the experiment. Therefore, this amount can achieve the best balance between film structure stability and gas-sensitive response efficiency, that is, this ratio is selected as the final preparation ratio; the excessive amount of CTS in Control Group 1 will destroy the SWCNTs conductive path and hinder the diffusion of acetone gas, resulting in a decrease in the response amplitude, so its voltage test result is significantly lower than that of Example 1; and the insufficient amount of CTS in Control Group 2 cannot effectively cover the SWCNTs-ZnO interface, and the sensitive interface is prone to failure, resulting in poor structural stability, and ultimately causing the output voltage test to be significantly lower than that of Example 1.

[0050] Example 2

[0051] A self-powered rapid detection device for acetone concentration in human breath, combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, it includes: a shell 1, a baffle 2 arranged in the shell 1, an elastic member 3 and a spiral TENG module 4 that is sensitive to acetone concentration. The baffle 2 divides the inner cavity of the shell 1 into an installation cavity and a gas collecting cavity. The spiral TENG module 4 and the elastic member 3 are arranged in the installation cavity. The shell 1 is provided with an exhalation hole 11 connecting the gas collecting cavity, and the baffle 2 is provided with an air hole 21 connecting the gas collecting cavity and the installation cavity. The baffle 2 moves under the action of human exhalation, and the elastic member 3 has a tendency to hinder the movement of the baffle 2. The spiral TENG module 4 is triboelectrically driven by the baffle 2. This application causes the baffle 2 to move through exhalation, thereby driving the spiral TENG module 4 to triboelectrically generate electricity. The characteristic that the spiral TENG module 4 is sensitive to acetone concentration is utilized. Different concentrations of acetone affect the generated electrical signal, thereby realizing rapid detection of acetone concentration in human exhaled breath. This application has the characteristics of being portable, fast, accurate and self-powered. It is suitable for rapid detection of acetone in the exhaled breath of diabetic patients and has important application value for health management and disease prevention.

[0052] Specifically, the system also includes a signal processing module that transmits the detected electrical signals to the signal processing module, which stores and processes the data to provide indicative indicators related to pathological characteristics. During the test, breathing is required to be stable and a certain exhalation time is limited. Multiple measurements are then performed to avoid measurement errors caused by exhalation differences and single measurements.

[0053] Specifically, the elastic member 3 adopts three springs, which are arranged around the outside of the spiral TENG module 4, one end of which is fixed to the bottom of the shell 1 by welding, and the other end is welded to the baffle 2.

[0054] Preferably, the spiral TENG module 4 includes: a PDMS film 41, a first electrode 42, a substrate 43, a second electrode 44, and a chitosan-doped zinc oxide SWCNTs-CTS-ZnO film 45. The PDMS film 41, the first electrode 42, the substrate 43, the second electrode 44, and the chitosan-doped zinc oxide SWCNTs-CTS-ZnO film 45 are stacked and bonded in sequence to form a spiral structure. Driven by the baffle 2, the spiral-shaped spiral TENG module 4 is continuously compressed and extended. Under the combined action of the unstable airflow and the elastic force inside the spring, the chitosan-doped zinc oxide SWCNTs-CTS-ZnO film 45 and the PDMS film 41 perform a continuous contact-separation motion, thereby completing triboelectric power generation. In this embodiment, the substrate 43 is made of flexible PET material.

[0055] Preferably, the first electrode 42 and the second electrode 44 are electrically connected to the signal processing module via wires for outputting electrical signals.

[0056] Specifically, the housing 1 is made of insulating material, such as transparent PLA, and the first electrode 42 and the second electrode 44 are both made of the same conductive material, such as copper, to utilize its conductive properties to achieve electrical signal output.

[0057] Preferably, the housing 1 is provided with an air outlet 22 that connects the mounting cavity to the outside of the housing 1 for outflow of exhaled air.

[0058] Preferably, multiple air holes 21 and air outlet holes 22 are arranged around the spiral TENG module 4, and the air holes 21 and air outlet holes 22 are staggered to extend the time that the exhaled gas stays in the installation cavity, so that the exhaled gas is in full contact with the chitosan-doped zinc oxide SWCNTs-CTS-ZnO film 45.

[0059] The performance test of the detection device prepared by using the film of Example 1 was carried out:

[0060] (1) Comparison of voltage of the detection device at different acetone concentrations

[0061] Test method:

[0062] A dynamic gas distribution system is used to adjust the flow ratio of high-purity nitrogen carrier gas and acetone standard gas source of known concentration through a precision flow controller to accurately prepare an acetone gas mixture with a concentration gradient of 2-10ppm. The target gas is introduced into the exhalation hole of the detection device at a constant flow rate (50mL / min), and the open circuit voltage between the two electrodes of the spiral TENG module is measured in real time. The gas is continuously introduced into each concentration point until the response is stable and the output voltage value is recorded. It is then switched to high-purity nitrogen to restore the baseline before the next concentration test is carried out. The entire test process is carried out in a constant temperature (25°C) and constant humidity (50% RH) environment, and finally the response curve of the device output voltage changing with the acetone concentration is obtained (such as Figure 8 shown).

[0063] Results: As Figure 8 To facilitate comparison of the overall output voltage trends at different acetone concentrations, the test results for air and acetone gas mixtures with a concentration gradient of 2-10 ppm are combined into a single graph, with equal acquisition time for each test. Within the 2-10 ppm acetone concentration range, the output voltage of the detector increases monotonically with increasing concentration, demonstrating a good linear response within this concentration range.

[0064] (2) Relationship between the output voltage of the detection device and the respiratory rate

[0065] Test method:

[0066] A programmable exhalation simulator was used to simulate different respiratory rates by adjusting the frequency of periodic airflow pulses (0.1 Hz to 0.7 Hz) at a fixed acetone concentration (10 ppm) and a constant exhaled flow rate / volume. A high-speed data acquisition system was used to record the open-circuit voltage waveform between the two electrodes of the detection device, and the peak output voltage and signal frequency were analyzed as a function of respiratory rate. The test was conducted in a constant temperature and humidity environment, with multiple repetitions at each frequency point.

[0067] Results: As Figure 9 As shown in the figure, in order to facilitate the comparison of the overall trend of the output voltage under different breathing frequencies and explore the relationship between the output voltage and the breathing frequency, the test results of breathing frequencies of 0.3Hz, 0.5Hz, 0.63Hz, and 0.8Hz are integrated into one figure, and the acquisition time of each test is equal. The test results show that the breathing frequency only significantly changes the frequency of the output voltage, while the overall effect on the voltage amplitude is not significant (the change is less than 7.3%). This is because when the device structure and the environment are fixed, the output voltage mainly depends on the maximum separation distance between the sensitive film and the friction film, and the breathing frequency itself only changes the vibration frequency of the device and has little effect on the expansion and contraction of the spiral TENG module.

[0068] (3) Response of the detection device to 10 ppm acetone and other interfering biomarkers

[0069] Test method:

[0070] Under constant temperature and humidity conditions, the device was sequentially introduced with 10 ppm acetone, 10 ppm ethanol, 10 ppm methane, 10 ppm hydrogen sulfide, 10 ppm ammonia, and 1% carbon dioxide. Only one gas was introduced at a time at a constant flow rate (50 mL / min). Each gas was introduced until the device output voltage stabilized, and its value was recorded. The device was then switched to high-purity nitrogen until the baseline was restored. The device response to each gas was calculated (defined as the relative percentage change in the stable output voltage relative to the baseline).

[0071] Results: As Figure 10 As shown, the sensor's response to 10 ppm acetone and other interfering biomarkers, including ethanol (10 ppm), CH4 (10 ppm), H2S (10 ppm), NH3 (10 ppm), and CO2 (1%), was compared. The detection device's response to acetone was at least 2.8 times greater than its response to other biomarkers, indicating that the detection device has a certain ability to distinguish acetone responses.

[0072] (4) Comparison of the stable output voltage of the detection device after normal exhalation and simulated gas

[0073] Test method:

[0074] Normal exhaled breath samples from healthy volunteers were collected as a low-acetone background reference. Simultaneously, simulated exhaled air containing 10 ppm acetone was artificially prepared. Under identical constant temperature and flow rate conditions, clean air (baseline), authentic healthy human exhaled breath, and 10 ppm acetone simulated exhaled air were sequentially introduced into the detection device. The output voltage of each gas was recorded after reaching steady state. The device's response to the simulated gas (relative to the baseline) was calculated (defined as the percentage change in relative voltage).

[0075] Results: The comparison of the stable output voltage of the detection device after exposure to the simulated gas is as follows: Figure 11 To facilitate comparison of the output voltages after stabilization of normal exhaled breath and simulated gas, the two gas test results are integrated into a single graph, with equal acquisition time for each test. The output voltage of the detector increases after exposure to the simulated gas. The calculated response to 10 ppm acetone in the simulated exhaled breath environment is 11.92%, demonstrating that the device has a reasonable ability to detect acetone in exhaled breath.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a SWCNTs-CTS-ZnO thin film, characterized in that: The following steps are involved: S1: mixing a zinc source and a dopant, adding a chitosan solution and a carbon nanotube dispersion, stirring to form a mixed solution, and performing a hydrothermal reaction. After the hydrothermal reaction is completed, cooling and washing to obtain a nanomaterial doped with carbon nanotubes, which is then dispersed in deionized water to form a suspension; S2: The suspension is coated on a PET substrate, and after drying and annealing, a SWCNTs-CTS-ZnO thin film is obtained.

2. The method for preparing the SWCNTs-CTS-ZnO thin film according to claim 1, characterized in that: The zinc source is a zinc acetate solution, and the concentration of the zinc acetate solution is 0.03 g / mL; The concentration of the carbon nanotube dispersion is 100 mg / mL; The concentration of the chitosan solution is 4 mg / mL; The dopant is sodium nitrate solution, and the concentration of the sodium nitrate solution is 0.5 mol / L; In S1, the volume ratio of the zinc acetate solution to the chitosan solution, the dopant, and the carbon nanotube dispersion is 50:1:10:

20.

3. The method for preparing the SWCNTs-CTS-ZnO thin film according to claim 1, characterized in that: The chitosan solution was prepared by dissolving 2 g of chitosan in 80 ml of 1% acetic acid aqueous solution, heating to 60° C. and stirring for 2 hours until the solution became clear and transparent, thereby completing the preparation of the chitosan solution.

4. The method for preparing the SWCNTs-CTS-ZnO thin film according to claim 1, characterized in that: The specific method for preparing the carbon nanotube dispersion is as follows: adding single-walled carbon nanotubes into deionized water, and ultrasonically treating the water for 2-3 hours to disperse the carbon nanotubes to form a carbon nanotube dispersion with a concentration of 100 mg / mL.

5. A SWCNTs-CTS-ZnO thin film, characterized in that: The SWCNTs-CTS-ZnO thin film is prepared by the preparation method of the SWCNTs-CTS-ZnO thin film according to claim 1.

6. A self-powered rapid detection device for acetone concentration in human breath, characterized in that: include: A shell (1), a baffle (2) arranged in the shell (1), an elastic member (3) and a spiral TENG module (4) sensitive to acetone concentration, wherein the baffle (2) divides the inner cavity of the shell (1) into an installation cavity and an air collection cavity, the spiral TENG module (4) and the elastic member (3) are arranged in the installation cavity, the shell (1) is provided with an exhalation hole (11) connected to the air collection cavity, and the baffle (2) is provided with an air hole (21) connected to the air collection cavity and the installation cavity; the baffle (2) moves under the action of human exhalation, the elastic member (3) has a tendency to hinder the movement of the baffle (2), and the spiral TENG module (4) generates electricity by friction under the drive of the baffle (2).

7. A self-powered rapid detection device for acetone concentration in human breath according to claim 6, characterized in that: The spiral TENG module (4) comprises: a PDMS film (41), a first electrode (42), a substrate (43), a second electrode (44) and a chitosan-doped zinc oxide SWCNTs-CTS-ZnO film (45); the PDMS film (41), the first electrode (42), the substrate (43), the second electrode (44) and the chitosan-doped zinc oxide SWCNTs-CTS-ZnO film (45) are sequentially stacked and bonded to form a spiral structure.

8. A self-powered rapid detection device for acetone concentration in human breath according to claim 7, characterized in that: The first electrode (42) and the second electrode (44) are electrically connected to the signal processing module via wires.

9. A self-powered rapid detection device for acetone concentration in human breath according to claim 7, characterized in that: The housing (1) is provided with an air outlet (22) for connecting the installation cavity to the outside of the housing (1).

10. A self-powered rapid detection device for acetone concentration in human breath according to claim 9, characterized in that: The air holes (21) and the air outlet holes (22) are staggered.

Images