Wireless flexible ethylene sensing and detection device based on mxene printed electronics and method

Abstract

The application discloses a wireless flexible ethylene sensing detection device and method based on MXene printed electronic devices. The sensor includes a flexible substrate, a printed MXene interdigital electrode, a printed MXene radio frequency antenna, and an ethylene sensing modification layer. The printed MXene interdigital electrode and the printed MXene radio frequency antenna are formed by one-time printing of additive-free MXene ink through a silk screen, and the radio frequency antenna and the interdigital electrode contained therein form a radio frequency resonance network with the sensing modification layer. The technology can respond to the ethylene concentration in the environment in real time and produce corresponding resonance parameter changes, and the wireless reading is realized through the mutual inductance principle. The method provides a new technical platform for wireless passive plant ethylene detection, and also provides an in-situ, real-time, simple and rapid sensing detection device for the application of plant wearable sensors in precision agriculture and food preservation.

Description

TECHNICAL FIELD

[0001] The present application relates to a detection technology of ethylene, in particular to a wireless flexible ethylene sensing and detection device and method based on MXene printed electronic device. BACKGROUND

[0002] The progress of flexible electronics technology has inspired the emerging field of plant wearable devices, which facilitates in-situ and continuous interface with plant surfaces to remotely monitor and control abiotic environmental factors, or biological responses of plants. In particular, plant wearable sensors provide a promising platform to address the fundamental mismatch between rigid detection devices and the diverse curved surfaces of plants, which is conducive to the development of intelligent agriculture. Unlike fixed detection systems that usually reflect the broad results of average environmental changes, plant wearable sensors can provide a more local perspective to describe the subtle changes of microclimate (humidity, temperature, light), mechanical growth, pesticides, and plant diseases. Among them, ethylene is a widely recognized plant hormone that plays a key role in regulating plant growth, development, immunity, and aging. Notably, tracking the ethylene emissions of fruit plants is particularly important for regulating the ripening and harvesting of fruits, which is of great significance to improve yield and avoid agricultural waste. Therefore, plant wearable analysis tools for continuous and in-situ ethylene detection will be invaluable. However, current methods based on gas chromatography-mass spectrometry (GC-MS) analysis lack flexibility and efficiency, while ethylene sensors often face poor sensitivity and selectivity, on the other hand, recently reported integrated plant wearable platforms either have low manufacturing efficiency or require wired external devices for sensor reading, which hinders their scalable deployment and practical use.

[0003] In recent years, the emerging family of two-dimensional (2D) transition metal carbides and nitrides, MXenes, has received great attention in the field of printed electronics due to their high electrical conductivity, excellent hydrophilicity, stable dispersibility, suitable flowability, and good mechanical strength. A lot of efforts have been made in the direct ink printing of multifunctional electronic devices based on MXenes, especially in micro-supercapacitors, sensors, actuators, and antennas. Among various printing techniques, screen printing is particularly attractive when designing planar flexible electronic devices, as it is convenient, fast, and scalable. To prepare viscous MXene screen printing ink, chemical templates or tackifiers are used to improve the viscosity of the ink at the expense of the electrical conductivity of the ink and tedious post-processing. However, the excellent gas sensing properties of MXene-based materials have not been fully utilized in the field of printed electronics. Notably, combining MXenes with noble metal nanoparticles, functional polymers, or other 2D materials can provide various sensitization mechanisms to enhance their gas response, highlighting a simple nanoplatform for room-temperature sensing. SUMMARY

[0004] The purpose of this invention is to address the shortcomings of existing technologies and products by providing a wireless flexible ethylene sensing and detection device and method based on MXene printed electronic devices, so as to realize continuous, in-situ, and real-time plant ethylene detection by wearable devices.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A wireless flexible ethylene sensing device based on MXene printed electronics includes an MXene printed wireless flexible ethylene sensor. The MXene printed wireless flexible ethylene sensor comprises a flexible substrate, printed MXene interdigitated electrodes, a printed MXene radio frequency antenna, and an ethylene sensing modification layer. The printed MXene interdigitated electrodes and the printed MXene radio frequency antenna are connected in series and printed on the flexible substrate. The ethylene sensing modification layer is assembled by drop-coating a solution of in-situ reduced palladium nanoparticles of MXene onto the surface of the printed MXene interdigitated electrodes and then drying it. The radio frequency antenna, interdigitated electrodes, and sensing modification layer form a radio frequency resonant network. The ethylene sensing modification layer selectively adsorbs ethylene and generates a corresponding impedance change. The printed MXene interdigitated electrodes couple this impedance change into the antenna resonant circuit, cooperating with the printed MXene radio frequency antenna to generate electromagnetic parameter changes. The MXene radio frequency antenna generates a wireless signal.

[0007] Furthermore, the printed MXene interdigitated electrodes and the printed MXene RF antenna are obtained by printing with MXene ink.

[0008] Furthermore, screen printing is achieved through the following method: the flexible substrate is cleaned with deionized water and isopropanol, and then dried with nitrogen; the flexible substrate is further treated with oxygen plasma equipment to improve its hydrophilicity; subsequently, MXene ink without additives is printed on the substrate using a 300-mesh stencil and a screen printing machine, with the stencil pattern predefined by the drawing software; the printed flexible substrate is dried in a 60°C oven to finally obtain printed MXene interdigitated electrodes and printed MXene RF antennas.

[0009] Furthermore, the MXene ink is an additive-free MXene ink, prepared by the following method: etching ceramic phase titanium aluminum carbon powder, peeling off the resulting precipitate directly by shear force generated by a vortex oscillator, repeating vortex oscillation and centrifugal washing to remove the supernatant, and directly collecting the viscous ink-like precipitate to obtain additive-free MXene ink.

[0010] Furthermore, the method for etching ceramic phase titanium aluminum carbon powder is as follows: 2g of lithium fluoride and 40mL of concentrated hydrochloric acid are mixed in a polytetrafluoroethylene beaker, and after stirring and reacting, 2g of 400-mesh ceramic phase titanium aluminum carbon powder is slowly added, and the mixture is stirred at 40℃ for 24h.

[0011] Furthermore, the vortex oscillation has an oscillation power of 9W and a single duration of 5 minutes.

[0012] Furthermore, the MXene in-situ reduced palladium nanoparticle solution is prepared by the following method: 2 mM PdCl2 solution with pH=4 is added dropwise to 0.25 mg / mL MXene, wherein the volume ratio of PdCl2 solution to 0.25 mg / mL MXene solution is 1:100-400, and the in-situ reaction yields the MXene in-situ reduced palladium nanoparticle solution.

[0013] Furthermore, the surface of the printed MXene RF antenna also includes an antenna encapsulation layer. The antenna encapsulation layer isolates ambient gases and contaminants.

[0014] Furthermore, the antenna encapsulation layer includes a PDMS encapsulation film and a PET encapsulation film.

[0015] Furthermore, the antenna encapsulation is prepared by the following method: a polydimethylsiloxane (PDMS) solution is poured onto a printed MXene RF antenna, a PDMS encapsulation film is prepared using a 25μm film-making machine, a 20μm polyethylene terephthalate film is used as a PET encapsulation film and adhered to the PDMS encapsulation film, and the antenna encapsulation layer is cut to match the antenna geometry by laser cutting to complete the encapsulation.

[0016] Furthermore, it also includes a portable network analyzer for collecting wireless signals emitted by the printed MXene RF antenna.

[0017] Furthermore, it also includes a smart terminal for receiving and displaying wireless signals collected by the portable network analyzer and analyzing the amount of ethylene released.

[0018] Based on the same principle, the present invention also provides an ethylene sensing detection method, comprising:

[0019] The MXene printed wireless flexible ethylene sensor is adhered to the surface of the object to be tested or in the packaging, and the electromagnetic parameters of the printed MXene radio frequency antenna are changed by the impedance change of the ethylene sensing modification layer to ethylene.

[0020] The ethylene concentration of the object under test is obtained by analyzing the relationship between the wireless signal and the ethylene concentration based on the principle of mutual inductance to receive the wireless signal emitted by the printed MXene RF antenna.

[0021] Furthermore, the object to be tested is a plant. The plant's ethylene secretion level is detected wirelessly, in situ, and in real-time via mutual inductive coupling using a portable grid analyzer and readout coil.

[0022] In the detection method of this invention, the adsorption and response of ethylene can be completed directly at room temperature through the ethylene sensing modification layer, without the need for gas concentration, high-temperature reaction or other pretreatment.

[0023] The beneficial effects of this invention are as follows: This invention provides a wireless flexible ethylene sensing and detection method and device based on MXene printed electronics, enabling wireless, real-time, in-situ ethylene detection in plants via wearable devices. The prepared additive-free MXene ink is easy to form, allowing for rapid and scalable fabrication of printed electronics, exhibiting good printing resolution, good conductivity, and mechanical robustness. MXene-reduced palladium nanoparticles, used as an ethylene sensing modification layer, contribute to higher sensitivity, a low detection limit for ethylene response, and good selectivity. This sensor offers flexibility in geometric design and substrate selection, allowing for real-time and continuous assessment of plant ethylene levels in the form of wearable plant tags. This work provides a scalable and applicable example of MXene printed electronics, offering inspiration for wearable plant sensing devices in agricultural research and the food industry. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the MXene printed wireless flexible ethylene sensor provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram illustrating the preparation of the additive-free MXene ink and ethylene sensing modification layer provided in an embodiment of the present invention;

[0027] Figure 3 This is a particle size distribution diagram of the MXene-free ink nanosheets provided in the embodiments of the present invention;

[0028] Figure 4 This is a graph showing the relationship between the modulus and shear pressure of the MXene-free ink provided in this embodiment of the invention.

[0029] Figure 5 This is a graph showing the relationship between viscosity and shear rate of the MXene-free ink provided in this embodiment of the invention.

[0030] Figure 6 This is a graph showing the linewidth error results of the printed MXene electronic device provided in an embodiment of the present invention;

[0031] Figure 7 This is a selective result diagram of the ethylene sensing modification layer provided in the embodiments of the present invention;

[0032] Figure 8 This is a schematic diagram of the wireless ethylene detection principle provided in an embodiment of the present invention;

[0033] Figure 9 This is a linear relationship graph between wireless ethylene detection results and ethylene concentration provided in an embodiment of the present invention;

[0034] Figure 10 This is a correlation diagram between the wireless ethylene detection results and the gas chromatography-mass spectrometry ethylene detection provided in the embodiments of the present invention;

[0035] Figure 11 This is a schematic diagram of wearable wireless, in-situ ethylene sensing and detection for plants provided in an embodiment of the present invention;

[0036] In the figure: 1. Flexible substrate; 2. Printed MXene interdigitated electrode; 3. Printed MXene RF antenna; 4. Ethylene sensing modification layer; 51. PDMS encapsulation film; 52. PET encapsulation film; 6. MXene printed wireless flexible ethylene sensor; 7. Plant; 8. Portable network analyzer; 9. Smart terminal. Detailed Implementation

[0037] This invention relates to the simple and scalable fabrication of a wireless wearable ethylene sensor for plants based on screen-printed MXene electronics. This sensor can be flexibly deployed as a smart tag on plants / fruits for continuous on-site ethylene detection. Due to the excellent rheological and electrical properties of additive-free MXene ink, MXene electronics can be screen-printed on various flexible substrates, exhibiting good resolution, high conductivity, and robust mechanical strength. In particular, a flexible circuit consisting of an antenna and a gas sensor is proposed, enabling information sensing and wireless readout. The use of MXene-reduced palladium nanoparticles further enhances the sensor tag's superior ethylene response and low detection limit at room temperature. Validation in real fruit samples demonstrates the platform's continuous and accurate analytical performance, indicating the significant potential of printed MXene electronics in the scalable fabrication of wearable smart sensing devices for plants.

[0038] The embodiments, features, and aspects of this disclosure will be described in detail below with reference to the accompanying drawings, but this is not intended to limit the invention. All other embodiments obtained by those skilled in the art based on any extension of the embodiments of this invention, without inventive effort, are within the scope of protection of this invention. The same reference numerals in the drawings denote the same or similar functional elements. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] In addition, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art should understand that this disclosure can be implemented without certain specific details. Some methods and means well known to those skilled in the art, as well as the use of components, are not described in detail in order to highlight the main points of this disclosure.

[0040] This invention provides a wireless flexible ethylene sensing and detection device based on MXene printed electronics, which mainly includes an MXene printed wireless flexible ethylene sensor 6 for wireless, in-situ, real-time ethylene concentration detection in plant wearable devices.

[0041] Figure 1 This paper demonstrates the printing process and structural composition of an MXene-printed wireless flexible ethylene sensor 6. The MXene-printed wireless flexible ethylene sensor 6 is assembled from a flexible substrate 1, printed MXene interdigitated electrodes 2, a printed MXene radio frequency antenna 3, and an ethylene sensing modification layer 4. The flexible substrate 1 serves as the support for the printed MXene electronic device and can typically be made of polyimide, PET, PDMS, etc. The printed MXene interdigitated electrodes 2 and the printed MXene radio frequency antenna 3 are printed in series on the surface of the flexible substrate 1. The ethylene sensing modification layer 4 is assembled on the surface of the printed MXene interdigitated electrodes 2. The ethylene sensing modification layer selectively adsorbs ethylene and generates a corresponding impedance change. The printed MXene interdigitated electrodes couple this impedance change to the antenna resonant circuit, working in conjunction with the printed MXene radio frequency antenna to generate electromagnetic parameter changes, which in turn generate a wireless signal. In addition, the surface of the printed MXene radio frequency antenna also includes an antenna encapsulation layer. The antenna encapsulation layer isolates ambient gases and pollutants. Preferably, the antenna encapsulation layer can be a PDMS encapsulation film 51 or a PET encapsulation film 52. Figure 1 This demonstrates the printing process for an MXene-printed wireless flexible vinyl sensor 6, such as... Figure 1 As shown, before use, the substrate is first cleaned with deionized water and isopropanol for 2 minutes each, and then dried with nitrogen. Then, the surface of the flexible substrate 1 is treated with oxygen plasma for 120 seconds to generate oxygen-containing functional groups to improve the hydrophilicity of the flexible substrate 1.

[0042] Subsequently, MXene ink without additives was printed onto the substrate using a 300-mesh stencil and a screen printing machine. The stencil pattern was predefined by the design software. The printed flexible substrate 1 was dried in a 60°C oven to obtain the printed MXene interdigitated electrodes 2 and the printed MXene RF antenna 3. Then, 200 μL of MXene in-situ reduced palladium nanoparticle solution was sprayed onto the printed MXene interdigitated electrodes 2 and dried using infrared thermal radiation to obtain the ethylene sensing modification layer 4.

[0043] Finally, the polydimethylsiloxane (PDMS) solution was poured onto the printed MXene RF antenna 3, and a PDMS encapsulation film 51 was prepared using a 25μm film-making machine. A 20μm PET encapsulation film 52 was then adhered onto the PDMS encapsulation film 51. The antenna encapsulation layer was then cut to match the antenna geometry using laser cutting to complete the encapsulation.

[0044] Figure 2 The preparation processes of additive-free MXene ink and in-situ reduced palladium nanoparticles by MXene are demonstrated. In a polytetrafluoroethylene beaker, 2g of lithium fluoride and 40mL of concentrated hydrochloric acid were mixed and stirred. After stirring, 2g of 400-mesh ceramic phase titanium-aluminum-carbon powder was slowly added, and the mixture was stirred at 40℃ for 24h. After the reaction, the solution was centrifuged at 3500 rpm for 5 minutes, the clear supernatant was removed, and 25mL of deionized water was added. The resulting precipitate was directly exfoliated by the shear force generated by a vortex shaker (9W power, 5 minutes per cycle) to obtain a uniformly mixed suspension. This suspension was then centrifuged at 5000 rpm for 10 minutes to remove the clear supernatant. This centrifugation, washing, and vortex shaking process was repeated 2-3 times until the supernatant turned dark black. Finally, the mixture was centrifuged at 12000 rpm for 30 minutes, and the viscous, ink-like black precipitate was collected to obtain additive-free MXene ink. When using 200-mesh ceramic phase titanium-aluminum-carbon powder while keeping other parameters constant, the dark black supernatant from the final step was collected to obtain MXene hydrosol. The concentration of MXene hydrosol was determined by vacuum filtration and diluted to 0.25 mg / mL with deionized water for later use. PdCl2 was dissolved in hydrochloric acid at pH 4 and vortexed to obtain a 2 mM PdCl2 solution. Then, 1 volume part of 2 mM PdCl2 was added dropwise to 400 volume parts of 0.25 mg / mL MXene hydrosol, and the solution was sonicated for 30 min to obtain in-situ reduced palladium nanoparticles of MXene, which were used to prepare an ethylene sensing modification layer.

[0045] Figure 3 The particle size distribution of the nanosheets in the additive-free MXene ink is shown. It can be seen that the particle size of the prepared MXene nanosheets is mainly concentrated around 600–1100 nm, with an average size of 1125.63 nm. The smaller MXene nanosheets facilitate uniform screen printing without clogging the mesh. Furthermore, as… Figure 4 As shown, under high shear stress (>20 Pa), the loss modulus (G”) of the ink is higher than the storage modulus (G’), making the additive-free MXene ink suitable for machine screen printing. Due to its high conversion rate and narrow nanosheet particle size distribution, the additive-free MXene ink exhibits shear thinning behavior. Figure 5 This characteristic is beneficial for continuous ink flow and uniform printing. For example... Figure 6As shown, due to the fast curing speed of the additive-free MXene ink and its stable bonding with the flexible substrate, the prepared printed electrode lines have good uniformity, with a line thickness variation range of 2.5%. This proves that the printing MXene electronic device preparation method provided in this embodiment has good precision and is suitable for large-scale production.

[0046] To further demonstrate the selectivity of the ethylene-sensing modified layer 4 for ethylene, this embodiment also tested other major plant metabolites (volatile organic compounds, ethanol, acetaldehyde, ethyl acetate), environmental interferences (carbon dioxide, formaldehyde), and other plant-derived olefins (isoprene). Specifically, the ethylene-sensing modified layer 4 was placed in an atmosphere of the aforementioned organic compounds at a certain concentration, and then the impedance of the ethylene-sensing modified layer 4 was measured using a digital multimeter. Figure 7 As shown, the ethylene sensing modification layer 4 exhibits the highest chemical impedance response to 20 ppm (parts per million, a unit of gas concentration) of ethylene gas, while its response to other interfering substances is very low. This good selectivity is due to the good matching of empty electron orbitals-lone pairs between the MXene in-situ reduced palladium nanoparticles and the unsaturated ethylene molecules.

[0047] In this embodiment, MXene in-situ reduced palladium nanoparticles are deposited on printed MXene interdigitated electrodes 2 via spraying to form an ethylene sensing modification layer 4. The chemical impedance response of this layer is coupled and converted into the resonant parameter response of the MXene printed wireless flexible ethylene sensor 6, thereby achieving wireless ethylene concentration detection. The detection principle is as follows: Figure 8 As shown, the lumped circuit model of the MXene printed wireless flexible ethylene sensor 6 can be equivalent to an RLC oscillating circuit consisting of a variable resistor (Rs), a lumped inductance (Ls), and a lumped capacitance (Cs) connected in series. The lumped inductance is mainly provided by the printed MXene RF antenna 3, the lumped capacitance is mainly provided by the printed MXene interdigital electrode 2 and the printed MXene RF antenna 3, and the variable resistor is mainly provided by the ethylene sensing modification layer 4. When the ethylene concentration changes, causing a change in the resistance value of Rs, the quality factor of the MXene printed wireless flexible ethylene sensor 6 changes accordingly, resulting in a corresponding change in the mutual inductance return loss (S11) generated by the readout coil and the portable network analyzer 8, thus achieving wireless ethylene concentration detection.

[0048] Based on the above principles, this embodiment further calibrates and tests the linear response of the MXene printed wireless flexible vinyl sensor 6. For example... Figure 9As shown, the detection range of 0.5 to 20 ppm covers the ethylene concentration released by plant fruits, from unripe (<1 ppm), just ripe (around 1 ppm), to overripe or rotten (10 ppm). Furthermore, the ethylene response of the MXene printed wireless flexible ethylene sensor 6 was linearly fitted in two ranges: 0.5–2 ppm and 2–20 ppm, with R0... 2 The values ​​were 0.98 and 0.97, respectively, indicating a good linear relationship. Therefore, the detection limit (LoD) calculated using 3σ / S was 0.084 ppm, where σ represents sensor noise and S represents the fitted sensitivity from 0.5 to 2 ppm. The two-segment linear fitting results show that the sensor tag has higher sensitivity at low ethylene concentrations (8.06% / ppm, 0.5–2 ppm), which is beneficial for wearable detection of plant fruit ripening.

[0049] To further demonstrate the detection accuracy of the MXene printed wireless flexible ethylene sensor 6, this embodiment tested the ethylene concentration in real fruit samples and collected headair from the fruit packaging for gas chromatography-mass spectrometry (GC-MS) detection as a control. Figure 10 As shown, the ethylene concentration detected by the MXene printed wireless flexible ethylene sensor 6 exhibits a similar trend to that of GC-MS results. The Pearson correlation coefficient between the two is 0.96, indicating the reliability of the MXene printed wireless flexible ethylene sensor 6 in actual ethylene detection.

[0050] Figure 11 A schematic diagram of the wearable wireless ethylene sensing for plants provided in this embodiment is shown. Due to the use of rapid, high-precision screen printing technology and a flexible substrate and encapsulation, the MXene-printed wireless flexible ethylene sensor 6 can be freely deployed on the leaves or fruits of plants 7. Using a portable network analyzer 8, the wearable plant sensor can wirelessly read out and detect in-situ ethylene release, providing insights for studying and regulating ethylene-related plant metabolism (e.g., fruit ripening). Real-time dynamic data on ethylene collected from the wearable plant sensor can be further transmitted to a smart terminal 9 for display and analysis.

[0051] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made without creative effort should be included within the protection scope of the present invention.

Claims

1. A wireless flexible ethylene sensing and detection device based on MXene printed electronics, characterized in that, It includes an MXene-printed wireless flexible ethylene sensor, which comprises a flexible substrate (1), printed MXene interdigitated electrodes (2), a printed MXene radio frequency antenna (3), and an ethylene sensing modification layer (4); wherein the printed MXene interdigitated electrodes (2) and the printed MXene radio frequency antenna (3) are connected in series and printed on the flexible substrate (1), and the ethylene sensing modification layer (4) is assembled on the surface of the printed MXene interdigitated electrodes (2) by drop-coating an MXene in-situ reduced palladium nanoparticle solution onto the surface of the printed MXene interdigitated electrodes (2) and drying it; the printed MXene interdigitated electrodes (2) and the printed MXene radio frequency antenna (3) are printed with MXene ink; the ... Xene ink is an additive-free MXene ink, prepared by the following method: etching ceramic phase titanium aluminum carbon powder, peeling off the resulting precipitate directly by shear force generated by a vortex oscillator, repeating vortex oscillation and centrifugal washing to remove the supernatant, and directly collecting the viscous ink-like precipitate to obtain additive-free MXene ink; printing MXene RF antenna (3) and printing MXene interdigitated electrode (2) together with ethylene sensing modification layer (4) constitute an RF resonant network. The ethylene sensing modification layer (4) is used to selectively adsorb ethylene and generate corresponding impedance changes. The printing MXene interdigitated electrode (2) couples the impedance changes into the antenna resonant circuit, and together with the printing MXene RF antenna (3) generates electromagnetic parameter changes. The printing MXene RF antenna (3) generates wireless signals.

2. The device according to claim 1, characterized in that, The MXene in-situ reduced palladium nanoparticle solution was prepared by the following method: 2 mM PdCl2 solution with pH=4 was added dropwise to 0.25 mg / mL MXene, wherein the volume ratio of PdCl2 solution to 0.25 mg / mL MXene solution was 1:100~400, and the in-situ reaction yielded the MXene in-situ reduced palladium nanoparticle solution.

3. The device according to claim 1, characterized in that, The surface of the printed MXene RF antenna (3) also includes an antenna encapsulation layer.

4. The device according to claim 3, characterized in that, The antenna encapsulation layer includes a PDMS encapsulation film (51) and a PET encapsulation film (52).

5. The device according to claim 1, characterized in that, It also includes a portable network analyzer (8) for collecting wireless signals emitted by the printed MXene RF antenna (3).

6. The device according to claim 5, characterized in that, It also includes a smart terminal (9) for receiving and displaying wireless signals collected by the portable network analyzer (8) and analyzing the amount of ethylene released.

7. A method for sensing and detecting ethylene, characterized in that, include: The MXene printed wireless flexible ethylene sensor (6) according to any one of claims 1-6 is adhered to the surface of the object to be tested or in the packaging, and the electromagnetic parameters of the printed MXene radio frequency antenna (3) are changed by the impedance change of ethylene generated by the ethylene sensing modification layer (4). The wireless signal emitted by the printed MXene RF antenna (3) is received using the mutual inductance principle, and the ethylene concentration of the object to be tested (7) is obtained by analyzing the relationship between the wireless signal and the ethylene concentration.

8. The method according to claim 7, characterized in that, The object to be tested is a plant.

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